Kernel Mode Cryptographic Primitives Library Security Policy Document
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Microsoft Windows
FIPS 140 Validation
Microsoft Windows 10 (Fall Creators Update, April 2018
Update, October 2018 Update)
Microsoft Windows 10 Mobile (Fall Creators Update)
Microsoft Windows Server (versions 1709, 1803) and
Windows Server 2019
Microsoft Azure Data Box Edge
Non-Proprietary
Security Policy Document
Version Number 1.4
Updated On July 31, 2019
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The information contained in this document
represents the current view of Microsoft Corporation
on the issues discussed as of the date of publication.
Because Microsoft must respond to changing market
conditions, it should not be interpreted to be a
commitment on the part of Microsoft, and Microsoft
cannot guarantee the accuracy of any information
presented after the date of publication.
This document is for informational purposes only.
MICROSOFT MAKES NO WARRANTIES, EXPRESS
OR IMPLIED, AS TO THE INFORMATION IN THIS
DOCUMENT.
Complying with all applicable copyright laws is the
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The names of actual companies and products
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Version History
Version Date Summary of changes
1.0 October 3, 2017 Draft sent to NIST CMVP
1.1 November 18, 2017 Updates for Windows 10 version
1709
1.2 May 1, 2018 Editing updates
1.3 October 22, 2018 Updates for Windows 10 version
1803
1.4 July 31, 2019 Updates for Windows 10 version
1809
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TABLE OF CONTENTS
SECURITY POLICY DOCUMENT.....................................................................................................1
VERSION HISTORY..............................................................................................................................3
1 INTRODUCTION...................................................................................................................8
1.1 LIST OF CRYPTOGRAPHIC MODULE BINARY EXECUTABLES..................................................................8
1.2 VALIDATED PLATFORMS............................................................................................................9
1.3 CONFIGURE WINDOWS TO USE FIPS-APPROVED CRYPTOGRAPHIC ALGORITHMS ..................................13
2 CRYPTOGRAPHIC MODULE SPECIFICATION.........................................................................13
2.1 CRYPTOGRAPHIC BOUNDARY....................................................................................................14
2.2 FIPS 140-2 APPROVED ALGORITHMS ........................................................................................14
2.3 NON-APPROVED ALGORITHMS .................................................................................................16
2.4 FIPS 140-2 APPROVED ALGORITHMS FROM BOUNDED MODULES ....................................................18
2.5 CRYPTOGRAPHIC BYPASS.........................................................................................................18
2.6 HARDWARE COMPONENTS OF THE CRYPTOGRAPHIC MODULE..........................................................19
3 CRYPTOGRAPHIC MODULE PORTS AND INTERFACES ..........................................................19
3.1 CNG PRIMITIVE FUNCTIONS ....................................................................................................19
3.1.1 ALGORITHM PROVIDERS AND PROPERTIES ...........................................................................................21
3.1.1.1 BCryptOpenAlgorithmProvider...................................................................................................21
3.1.1.2 BCryptCloseAlgorithmProvider...................................................................................................21
3.1.1.3 BCryptSetProperty ......................................................................................................................21
3.1.1.4 BCryptGetProperty......................................................................................................................21
3.1.1.5 BCryptFreeBuffer ........................................................................................................................22
3.1.2 RANDOM NUMBER GENERATION .......................................................................................................22
3.1.2.1 BCryptGenRandom .....................................................................................................................22
3.1.2.2 SystemPrng .................................................................................................................................22
3.1.2.3 EntropyRegisterSource ...............................................................................................................23
3.1.2.4 EntropyUnregisterSource............................................................................................................23
3.1.2.5 EntropyProvideData....................................................................................................................23
3.1.2.6 EntropyPoolTriggerReseedForIum..............................................................................................23
3.1.3 KEY AND KEY-PAIR GENERATION........................................................................................................23
3.1.3.1 BCryptGenerateSymmetricKey ...................................................................................................23
3.1.3.2 BCryptGenerateKeyPair ..............................................................................................................24
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3.1.3.3 BCryptFinalizeKeyPair .................................................................................................................24
3.1.3.4 BCryptDuplicateKey ....................................................................................................................24
3.1.3.5 BCryptDestroyKey.......................................................................................................................24
3.1.4 KEY ENTRY AND OUTPUT ..................................................................................................................24
3.1.4.1 BCryptImportKey.........................................................................................................................24
3.1.4.2 BCryptImportKeyPair ..................................................................................................................25
3.1.4.3 BCryptExportKey.........................................................................................................................25
3.1.5 ENCRYPTION AND DECRYPTION..........................................................................................................25
3.1.5.1 BCryptEncrypt .............................................................................................................................25
3.1.5.2 BCryptDecrypt.............................................................................................................................26
3.1.6 HASHING AND MESSAGE AUTHENTICATION .........................................................................................26
3.1.6.1 BCryptCreateHash.......................................................................................................................26
3.1.6.2 BCryptHashData..........................................................................................................................26
3.1.6.3 BCryptDuplicateHash..................................................................................................................27
3.1.6.4 BCryptFinishHash........................................................................................................................27
3.1.6.5 BCryptDestroyHash.....................................................................................................................27
3.1.6.6 BCryptHash..................................................................................................................................27
3.1.6.7 BCryptCreateMultiHash..............................................................................................................27
3.1.6.8 BCryptProcessMultiOperations...................................................................................................28
3.1.7 SIGNING AND VERIFICATION ..............................................................................................................28
3.1.7.1 BCryptSignHash...........................................................................................................................28
3.1.7.2 BCryptVerifySignature.................................................................................................................29
3.1.8 SECRET AGREEMENT AND KEY DERIVATION..........................................................................................29
3.1.8.1 BCryptSecretAgreement .............................................................................................................29
3.1.8.2 BCryptDeriveKey .........................................................................................................................29
3.1.8.3 BCryptDestroySecret...................................................................................................................30
3.1.8.4 BCryptKeyDerivation...................................................................................................................30
3.1.8.5 BCryptDeriveKeyPBKDF2.............................................................................................................30
3.1.9 CRYPTOGRAPHIC TRANSITIONS...........................................................................................................31
3.1.9.1 DH and ECDH...............................................................................................................................31
3.1.9.2 SHA-1...........................................................................................................................................31
3.2 CONTROL INPUT INTERFACE .....................................................................................................31
3.3 STATUS OUTPUT INTERFACE.....................................................................................................31
3.4 DATA OUTPUT INTERFACE .......................................................................................................31
3.5 DATA INPUT INTERFACE ..........................................................................................................31
3.6 NON-SECURITY RELEVANT CONFIGURATION INTERFACES.................................................................31
4 ROLES, SERVICES AND AUTHENTICATION...........................................................................33
4.1 ROLES.................................................................................................................................33
4.2 SERVICES.............................................................................................................................33
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4.2.1 MAPPING OF SERVICES, ALGORITHMS, AND CRITICAL SECURITY PARAMETERS ...........................................33
4.2.2 MAPPING OF SERVICES, EXPORT FUNCTIONS, AND INVOCATIONS ............................................................35
4.2.3 NON-APPROVED SERVICES................................................................................................................36
4.3 AUTHENTICATION..................................................................................................................37
5 FINITE STATE MODEL.........................................................................................................37
5.1 SPECIFICATION......................................................................................................................37
6 OPERATIONAL ENVIRONMENT...........................................................................................38
6.1 SINGLE OPERATOR.................................................................................................................38
6.2 CRYPTOGRAPHIC ISOLATION.....................................................................................................38
6.3 INTEGRITY CHAIN OF TRUST .....................................................................................................39
7 CRYPTOGRAPHIC KEY MANAGEMENT................................................................................40
7.1 ACCESS CONTROL POLICY........................................................................................................41
7.2 KEY MATERIAL......................................................................................................................42
7.3 KEY GENERATION ..................................................................................................................42
7.4 KEY ESTABLISHMENT ..............................................................................................................42
7.4.1 NIST SP 800-132 PASSWORD BASED KEY DERIVATION FUNCTION (PBKDF) ...........................................43
7.4.2 NIST SP 800-38F AES KEY WRAPPING..............................................................................................44
7.5 KEY ENTRY AND OUTPUT.........................................................................................................44
7.6 KEY STORAGE .......................................................................................................................44
7.7 KEY ARCHIVAL ......................................................................................................................44
7.8 KEY ZEROIZATION..................................................................................................................44
8 SELF-TESTS........................................................................................................................44
8.1 POWER-ON SELF-TESTS ..........................................................................................................44
8.2 CONDITIONAL SELF-TESTS........................................................................................................45
9 DESIGN ASSURANCE..........................................................................................................45
10 MITIGATION OF OTHER ATTACKS.......................................................................................46
11 SECURITY LEVELS...............................................................................................................47
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12 ADDITIONAL DETAILS ........................................................................................................47
13 APPENDIX A – HOW TO VERIFY WINDOWS VERSIONS AND DIGITAL SIGNATURES ...............48
13.1 HOW TO VERIFY WINDOWS VERSIONS .......................................................................................48
13.2 HOW TO VERIFY WINDOWS DIGITAL SIGNATURES .........................................................................48
14 APPENDIX B – REFERENCES................................................................................................49
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1 Introduction
Microsoft Kernel Mode Cryptographic Primitives Library is a kernel-mode cryptographic module that
provides cryptographic services through the Microsoft CNG (Cryptography, Next Generation) API to
Windows 10 kernel components.
Kernel Mode Cryptographic Primitives Library also provides cryptographic provider registration and
configuration services to both user and kernel mode components. See Non-Security Relevant
Configuration Interfaces for more information.
The relationship between Kernel Mode Cryptographic Primitives Library and other components is shown
in the following diagram:
Application
Application layer
CNG API router
(BCRYPT.DLL)
BCRYPTPRIMITIVES.DLL Other provider(s)
CNG API
Kernel
CNG Provider
Layer
CNG API Layer CNG Provider
Interface
CNG.SYS
Driver
Provider
Registration
RNG
Entropy
Source
Entropy
Source
Crpyto Provider Installer
1.1 List of Cryptographic Module Binary Executables
The Kernel Mode Cryptographic Primitives Library consists of the following binaries:
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 CNG.SYS
The Windows builds covered by this validation are:
 Windows 10 version 1709 and Windows Server version 1709 build 10.0.16299
 Windows 10 Mobile version 1709 build 10.0.15254
 Microsoft Surface Hub build 10.0.15063.674
 Windows 10 version 1803 and Windows Server version 1803 build 10.0.17134
 Windows 10 version 1809 and Windows Sever 2019 build 10.0.17763
 Microsoft Azure Data Box Edge build 10.0.17763
1.2 Validated Platforms
The Windows editions covered by this validation are:
 Windows 10 Home Edition (32-bit version)
 Windows 10 Pro Edition (64-bit version)
 Windows 10 Enterprise Edition (64-bit version)
 Windows 10 Education Edition (64-bit version)
 Windows 10 S Edition (64-bit version)
 Windows 10 Mobile
 Microsoft Surface Hub
 Windows Server Standard Core
 Windows Server Datacenter Core
 Microsoft Azure Data Box Edge
The Kernel Mode Cryptographic Primitives Library component listed in Section 1.1 was validated using
the combination of computers and Windows operating system editions specified in the table below.
All the computers for Windows 10 and Windows Server listed in the table below are all 64-bit Intel
architecture and implement the AES-NI instruction set but not the SHA Extensions. The exceptions are:
 Dell Inspiron 660s - Intel Core i3 without AES-NI and SHA Extensions
 HP Slimline Desktop - Intel Pentium with AES-NI and SHA Extensions
Windows 10 Mobile runs on the ARM architecture, which does not implement AES-Ni instructions or
SHA extensions:
 Microsoft Lumia 950 - Qualcomm Snapdragon 808 (A57, A53)
 Microsoft Lumia 950 XL - Qualcomm Snapdragon 810 (A57, A53)
 Microsoft Lumia 650 - Qualcomm Snapdragon 212 (A7)
 HP Elite x3 - Qualcomm Snapdragon 820 (Kryo)
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Table 1 Validated Platforms for Windows 10 Creators Update, Fall Creators Update and Windows Server
Computer
Windows
10
Home
Windows
10
Pro
Windows
10
Enterprise
Windows
10
Education
Surface
Hub
Windows
10
S
Windows
10
Mobile
Windows
Server
Standard
Windows
Server
Datacenter
Microsoft Surface Book 2 √
Microsoft Surface Laptop √ √ √
Microsoft Surface Pro √ √ √
Microsoft Surface Book √
Microsoft Surface Pro 4 √
Microsoft Surface Pro 3 √
Microsoft Surface 3 with LTE √
Microsoft Surface Studio √
Microsoft Surface Hub √
Windows Server Standard Core
Hyper-V1
√ √
Windows Server 2016 Hyper-V2
√
Microsoft Lumia 950 √
Microsoft Lumia 950 XL √
Microsoft Lumia 650 √
Dell Latitude 5285 √
Dell Latitude 5290 √
Dell Inspiron 660s √
Dell Precision Tower 5810MT √ √ √
Dell PowerEdge R630 √ √ √
Dell PowerEdge R740 √ √
HP Elite X3 √
HP Compaq Pro 6305 √
HP Pro x2 612 G2 Detachable PC with
LTE
√
HP Slimline Desktop √
Panasonic Toughbook √
1
Hardware platform: Dell 5810MT
2
Hardware platform: Surface Pro 4
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Table 2 Validated Platforms for Windows 10 and Windows Server version 1803
Computer Windows
10 Home
Windows
10 Pro
Windows 10
Enterprise
Windows 10
Education
Windows
Server
Standard
Windows
Server
Datacenter
Microsoft
Surface Go √
Microsoft
Surface Book 2
√ √
Microsoft
Surface Pro LTE
√ √
Microsoft
Surface Laptop
√ √ √
Microsoft
Surface Studio
√
Windows Server
Standard Core
Hyper-V3 √ √
Windows Server
2016 Hyper-V4
√
Dell Latitude
5290
√
Dell Latitude 12
Rugged Tablet √
Dell Inspiron
660s
√
Dell PowerEdge
R740 √ √
HP Pro x2 612 G2
Detachable PC
with LTE
√
HP Slimline
Desktop
√
Microsoft
Surface Pro 6 √
Microsoft
Surface Laptop 2
√
3
Hardware platform: Dell Precision Tower 5810MT
4
Hardware platform: Dell PowerEdge R740
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Computer Windows
10 Home
Windows
10 Pro
Windows 10
Enterprise
Windows 10
Education
Windows
Server
Standard
Windows
Server
Datacenter
Microsoft
Surface Studio 2
√
Table 3 Validated Platforms for Windows 10 and Windows Server version 1809 and Azure Data Box Edge
Computer Windows
10 Home
Windows
10 Pro
Windows
10
Enterprise
Windows
10
Education
Windows
Server
2019
Windows
Server
2019
Datacenter
Azure
Data Box
Edge
Microsoft
Surface Go √
Microsoft
Surface Book 2 √ √
Microsoft
Surface Pro
LTE
√ √
Microsoft
Surface Laptop √ √ √
Microsoft
Surface Studio √
Microsoft
Windows
Server 2019
Hyper-V5
√ √
Microsoft
Windows
Server 2016
Hyper-V6
√
Dell Latitude
12 Rugged
Tablet
√
Dell Latitude
5290 √
Dell
PowerEdge
R740
√ √
5
Hardware Platform: Dell Precision Tower 5810MT
6
Hardware Platform: Dell PowerEdge R740 Server
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Dell Inspiron
660s [with x86
Windows]
√
HP Slimline
Desktop √
HP Elite x2
1013 G3 Tablet √
HP EliteBook
x360 1030 G2 √
Samsung
Galaxy Book
10.6”
√
Samsung
Galaxy Book
12”
√
Microsoft
Azure Data
Box Edge
√
1.3 Configure Windows to use FIPS-Approved Cryptographic Algorithms
Use the FIPS Local/Group Security Policy setting or a Mobile Device Management (MDM) to enable FIPS-
Approved mode for Kernel Mode Cryptographic Primitives Library.
The Windows operating system provides a group (or local) security policy setting, “System cryptography:
Use FIPS compliant algorithms for encryption, hashing, and signing”.
Consult the MDM documentation for information on how to enable FIPS-Approved mode. The Policy
CSP - Cryptography includes the setting AllowFipsAlgorithmPolicy.
Changes to the Approved mode security policy setting do not take effect until the computer has been
rebooted.
2 Cryptographic Module Specification
Kernel Mode Cryptographic Primitives Library is a multi-chip standalone module that operates in FIPS-
Approved mode during normal operation of the computer and Windows operating system and when
Windows is configured to use FIPS-approved cryptographic algorithms as described in Configure
Windows to use FIPS-Approved Cryptographic Algorithms.
In addition to configuring Windows to use FIPS-Approved Cryptographic Algorithms, third-party
applications and drivers installed on the Windows platform must not use any of the non-approved
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algorithms implemented by this module. Windows will not operate in an Approved mode when the
operators chooses to use a non-Approved algorithm or service.
The following configurations and modes of operation will cause Kernel Mode Cryptographic Primitives
Library to operate in a non-approved mode of operation:
 Boot Windows in Debug mode
 Boot Windows with Driver Signing disabled
 Windows enters the ACPI S4 power state (for Windows 10 version 1803 and 1809)
2.1 Cryptographic Boundary
The software cryptographic boundary for Kernel Mode Cryptographic Primitives Library is defined as the
binary CNG.SYS.
2.2 FIPS 140-2 Approved Algorithms
Kernel Mode Cryptographic Primitives Library implements the following FIPS-140-2 Approved
algorithms:7
Algorithm Windows
10 and
Windows
Server
version
1709
Window
s 10
Mobile
version
1709
Micros
oft
Surface
Hub
(10.0.1
5063.67
4)
Window
s 10 and
Window
s Server
version
1803
Windows
10
version
1809 and
Windows
Server
2019
Azure
Data
Box
Edge
FIPS 180-4 SHS SHA-1, SHA-256,
SHA-384, and SHA-512
#4009 #4010 #4011 # 4633 #C 211 #C 211
FIPS PUB 198-1 HMAC-SHA-18
and
HMAC-SHA-256
#3267 #3268 #3269 # 3858 #C 211 #C 211
FIPS 197 AES-128, AES-192, and
AES-256 in ECB, CBC, CFB8,
CFB128, and CTR modes
#4897 #4901 #4902 # 5847 #C 211 #C 211
NIST SP 800-38B and SP 800-38C
AES-128, AES-192, and AES-256 in
CCM and CMAC modes
#4897 #4901 #4902 # 5847 #C 211 #C 211
NIST SP 800-38D AES-128, AES-
192, and AES-256 GCM decryption
and GMAC
#4897 #4901 #4902 # 5847 #C 211 #C 211
7
This module may not use some of the capabilities described in each CAVP certificate.
8
For HMAC, only key sizes that are >= 112 bits in length are used by the module in FIPS mode.
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NIST SP 800-38E XTS-AES XTS-128
and XTS-2569 #4897 #4901 #4902 # 5847 #C 211 #C 211
FIPS 186-4 RSA PKCS#1 (v1.5)
digital signature generation and
verification with 1024, 2048, and
3072 moduli; supporting SHA-110
,
SHA-256, SHA-384, and SHA-512
#2667 #2670 #2671 # 3079 #C 211 #C 211
FIPS 186-4 RSA key-pair
generation with 2048 and 3072
moduli
#2667 #2670 #2671 # 3079 #C 211 #C 211
FIPS 186-4 ECDSA key pair
generation and verification,
signature generation and
verification with the following
NIST curves: P-256, P-384, P-521
#1246 #1249 #1250 # 1563 #C 211 #C 211
FIPS 186-4 DSA PQG generation
and verification, signature
generation and verification
#1301 #1302 #1303 # 1479 #C 211 #C 211
KAS – SP 800-56A Diffie-Hellman
Key Agreement; Finite Field
Cryptography (FFC) with
parameter FB (p=2048, q=224) and
FC (p=2048, q=256); key
establishment methodology
provides 112 bits of encryption
strength
#146 #147 #148 # 200 #C 211 #C 211
KAS – SP 800-56A EC Diffie-
Hellman Key Agreement; Elliptic
Curve Cryptography (ECC) with
parameter EC (P-256 w/ SHA-256),
ED (P-384 w/ SHA-384), and EE (P-
521 w/ SHA-512); key
establishment methodology
provides between 128 and 256-
bits of encryption strength
#146 #147 #148 # 200 #C 211 #C 211
NIST SP 800-56B RSADP mod 2048
#1498 #1509 #1513 # 2111 #C 211 #C 211
NIST SP 800-90A AES-256 counter
mode DRBG #1730 #1731 #1732 # 2435 #C 211 #C 211
9
AES XTS must be used only to protect data at rest and the caller needs to ensure that the length of data
encrypted does not exceed 220
AES blocks.
10
SHA-1 is only acceptable for legacy signature verification.
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NIST SP 800-67r1 Triple-DES (2 key
legacy-use decryption11
and 3 key
encryption/decryption) in ECB,
CBC, CFB8 and CFB64 modes
#2556 #2557 #2558 # 2862 #C 211 #C 211
NIST SP 800-108 Key Derivation
Function (KDF) CMAC-AES (128,
192, 256), HMAC (SHA1, SHA-256,
SHA-384, SHA-512)
#157 #158 #159 # 242 #C 347 #C 347
NIST SP 800-38F AES Key
Wrapping (128, 192, and 256)
#4898 #4899 #4900 # 5860 #C 347 #C 347
NIST SP 800-135 IKEv1, IKEv2 and
TLS KDF primitives12
#1496 #1507 #1511 # 2110 #C 211 #C 211
NIST SP 800-132 KDF (also known
as PBKDF) with HMAC (SHA-1,
SHA-256, SHA-384, SHA-512) as
the pseudo-random function
Vendor affirmed
2.3 Non-Approved Algorithms
Kernel Mode Cryptographic Primitives Library implements the following non-approved algorithms:
 A non-determinic random number generator (NDRNG) that is a not a FIPS Approved algorithm
but is allowed by FIPS 140. The NDRNG provides entropy input to the DRBG.
 SHA-1 hash, which is disallowed for use in digital signature generation. It can be used for legacy
digital signature verification. Its use is Acceptable for non-digital signature generation
applications.
 RSA 1024-bits for digital signature generation, which is disallowed.
 NIST SP 800-56A Key Agreement using Finite Field Cryptography (FFC) with parameter FA
(p=1024, q=160). The key establishment methodology provides 80 bits of encryption strength
instead of the Approved 112 bits of encryption strength listed above.
 If HMAC-SHA1 is used, key sizes less than 112 bits (14 bytes) are not allowed for usage in HMAC
generation, as per SP 800-131A.
 MD5 and HMAC-MD5 - allowed for TLS and EAP-TLS
 RC2, RC4, MD2, MD4 (disallowed in FIPS mode)
 2-Key Triple-DES Encryption, which is disallowed for usage altogether as of the end of 2015.
11
Two-key Triple-DES Decryption is only allowed for Legacy-usage (as per SP 800-131A). The use of two-key Triple-
DES Encryption is disallowed. The caller is responsible for using the key for up to 2^20 encryptions for IETF
protocols and 2^16 encryptions for any other use.
12
This cryptographic module supports the TLS, IKEv1, and IKEv2 protocols with SP 800-135 rev 1 KDF primitives,
however, the protocols have not been reviewed or tested by the NIST CAVP and CMVP.
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 DES in ECB, CBC, CFB8 and CFB64 modes (disallowed in FIPS mode)
 Legacy CAPI KDF (proprietary; disallowed in FIPS mode)
 HKDF (disallowed in FIPS mode)
 RSA encrypt/decrypt (disallowed in FIPS mode)
 IEEE 1619-2007 XTS-AES, XTS-128 and XTS-256
 NIST SP 800-38D AES-128, AES-192, and AES-256 GCM encryption
 ECDH with the following curves that are allowed in FIPS mode as per FIPS 140-2 IG A.2
Curve Security Strength (bits) Allowed in FIPS mode
Curve25519 128 Yes
brainpoolP160r1 80 No
brainpoolP192r1 96 No
brainpoolP192t1 96 No
brainpoolP224r1 112 Yes
brainpoolP224t1 112 Yes
brainpoolP256r1 128 Yes
brainpoolP256t1 128 Yes
brainpoolP320r1 160 Yes
brainpoolP320t1 160 Yes
brainpoolP384r1 192 Yes
brainpoolP384t1 192 Yes
brainpoolP512r1 256 Yes
brainpoolP512t1 256 Yes
ec192wapi 96 No
nistP192 96 No
nistP224 112 Yes
numsP256t1 128 Yes
numsP384t1 192 Yes
numsP512t1 256 Yes
secP160k1 80 No
secP160r1 80 No
secP160r2 80 No
secP192k1 96 No
secP192r1 96 No
secP224k1 112 Yes
secP224r1 112 Yes
secP256k1 128 Yes
secP256r1 128 Yes
secP384r1 192 Yes
secP521r1 256 Yes
wtls12 112 Yes
wtls7 80 No
wtls9 80 No
x962P192v1 96 No
x962P192v2 96 No
x962P192v3 96 No
x962P239v1 120 Yes
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Curve Security Strength (bits) Allowed in FIPS mode
x962P239v2 120 Yes
x962P239v3 120 Yes
x962P256v1 128 Yes
2.4 FIPS 140-2 Approved Algorithms from Bounded Modules
A bounded module is a FIPS 140 module which provides cryptographic functionality that is relied on by a
downstream module. As described in the Integrity Chain of Trust section, Code Integrity depends on the
following modules and algorithms:
The Windows OS Loader for Windows 10 version 1709 (module certificate # 3194) provides:
 CAVP certificates #2674 (Windows 10 and Windows Server), #2673 (Windows 10 Mobile), #2675
(Surface Hub) for FIPS 186-4 RSA PKCS#1 (v1.5) digital signature verification with 2048 moduli;
supporting SHA-256
 CAVP certificates #4009 (Windows 10 and Windows Server), #4010 (Windows 10 Mobile), #4011
(Surface Hub) for FIPS 180-4 SHS SHA-256
The Windows OS Loader for Windows 10 version 1803 (module certificate #3480) provides:
 CAVP certificates # 3081 (Windows 10 and Windows Server) for FIPS 186-4 RSA PKCS#1 (v1.5)
digital signature verification with 2048 moduli; supporting SHA-256
 CAVP certificates # 4633 (Windows 10 and Windows Server) for FIPS 180-4 SHS SHA-256
The Windows OS Loader for Windows 10 version 1809 (module certificate #3615) provides:
 CAVP certificates #C 349 (Windows 10 and Windows Server) for FIPS 186-4 RSA PKCS#1 (v1.5)
digital signature verification with 2048 moduli; supporting SHA-256
 CAVP certificates #C 211 (Windows 10 and Windows Server) for FIPS 180-4 SHS SHA-256
The Windows Resume for Windows 10 version 1709 (module certificate #3091) decrypts and
restores the encrypted memory state during a boot from hibernation, which acts to preserve the
module’s integrity (established by the Windows OS Loader) across hibernations:
 CAVP certificate #4897 (Windows 10 and Windows Server) for FIPS 197 AES CBC 128 and 256, SP
800-38E AES XTS 128 and 256
2.5 Cryptographic Bypass
Cryptographic bypass is not supported by Kernel Mode Cryptographic Primitives Library.
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2.6 Hardware Components of the Cryptographic Module
The physical boundary of the module is the physical boundary of the computer that contains the
module. The following diagram illustrates the hardware components of the Kernel Mode Cryptographic
Primitives Library module:
3 Cryptographic Module Ports and Interfaces
The Kernel Mode Cryptographic Primitives Library module implements a set of algorithm providers for
the Cryptography Next Generation (CNG) framework in Windows. Each provider in this module
represents a single cryptographic algorithm or a set of closely related cryptographic algorithms. These
algorithm providers are invoked through the CNG algorithm primitive functions, which are sometimes
collectively referred to as the CNG API. For a full list of these algorithm providers, see
https://msdn.microsoft.com/en-us/library/aa375534.aspx
The Kernel Mode Cryptographic Primitives Library module is accessed through one of the following
logical interfaces:
1. Kernel applications requiring cryptographic services use the BCrypt APIs detailed in Services.
2. Entropy sources supply random bits to the random number generator through the entropy
interfaces.
3.1 CNG Primitive Functions
The following security-relevant functions are exported by Kernel Mode Cryptographic Primitives Library:
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 BCryptCloseAlgorithmProvider
 BCryptCreateHash
 BCryptCreateMultiHash
 BCryptDecrypt
 BCryptDeriveKey
 BCryptDeriveKeyPBKDF2
 BCryptDestroyHash
 BCryptDestroyKey
 BCryptDestroySecret
 BCryptDuplicateHash
 BCryptDuplicateKey
 BCryptEncrypt
 BCryptExportKey
 BCryptFinalizeKeyPair
 BCryptFinishHash
 BCryptFreeBuffer
 BCryptGenerateKeyPair
 BCryptGenerateSymmetricKey
 BCryptGenRandom
 BCryptGetProperty
 BCryptHash
 BCryptHashData
 BCryptImportKey
 BCryptImportKeyPair
 BCryptKeyDerivation
 BCryptOpenAlgorithmProvider
 BCryptProcessMultiOperations
 BCryptSecretAgreement
 BCryptSetProperty
 BCryptSignHash
 BCryptVerifySignature
 SystemPrng
 EntropyPoolTriggerReseedForIum
 EntropyProvideData
 EntropyRegisterSource
 EntropyUnregisterSource
All of these functions are used in the approved mode. Furthermore, these are the only approved
functions that this module can perform.
Kernel Mode Cryptographic Primitives Library has additional export functions described in Non-Security
Relevant Configuration Interfaces.
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3.1.1 Algorithm Providers and Properties
3.1.1.1 BCryptOpenAlgorithmProvider
NTSTATUS WINAPI BCryptOpenAlgorithmProvider(
BCRYPT_ALG_HANDLE *phAlgorithm,
LPCWSTR pszAlgId,
LPCWSTR pszImplementation,
ULONG dwFlags);
The BCryptOpenAlgorithmProvider() function has four parameters: algorithm handle output to the
opened algorithm provider, desired algorithm ID input, an optional specific provider name input, and
optional flags. This function loads and initializes a CNG provider for a given algorithm, and returns a
handle to the opened algorithm provider on success.
Unless the calling function specifies the name of the provider, the default provider is used.
The calling function must pass the BCRYPT_ALG_HANDLE_HMAC_FLAG flag in order to use an HMAC
function with a hash algorithm.
3.1.1.2 BCryptCloseAlgorithmProvider
NTSTATUS WINAPI BCryptCloseAlgorithmProvider(
BCRYPT_ALG_HANDLE hAlgorithm,
ULONG dwFlags);
This function closes an algorithm provider handle opened by a call to BCryptOpenAlgorithmProvider()
function.
3.1.1.3 BCryptSetProperty
NTSTATUS WINAPI BCryptSetProperty(
BCRYPT_HANDLE hObject,
LPCWSTR pszProperty,
PUCHAR pbInput,
ULONG cbInput,
ULONG dwFlags);
The BCryptSetProperty() function sets the value of a named property for a CNG object. The CNG object
is a handle, the property name is a NULL terminated string, and the value of the property is a length-
specified byte string.
3.1.1.4 BCryptGetProperty
NTSTATUS WINAPI BCryptGetProperty(
BCRYPT_HANDLE hObject,
LPCWSTR pszProperty,
PUCHAR pbOutput,
ULONG cbOutput,
ULONG *pcbResult,
ULONG dwFlags);
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The BCryptGetProperty() function retrieves the value of a named property for a CNG object. The CNG
object is a handle, the property name is a NULL terminated string, and the value of the property is a
length-specified byte string.
3.1.1.5 BCryptFreeBuffer
VOID WINAPI BCryptFreeBuffer(
PVOID pvBuffer);
Some of the CNG functions allocate memory on caller’s behalf. The BCryptFreeBuffer() function frees
memory that was allocated by such a CNG function.
3.1.2 Random Number Generation
3.1.2.1 BCryptGenRandom
NTSTATUS WINAPI BCryptGenRandom(
BCRYPT_ALG_HANDLE hAlgorithm,
PUCHAR pbBuffer,
ULONG cbBuffer,
ULONG dwFlags);
The BCryptGenRandom() function fills a buffer with random bytes. The random number generation
algorithm is:
 BCRYPT_RNG_ALGORITHM. This is the AES-256 counter mode based random generator as
defined in SP 800-90A.
This function is a wrapper for SystemPrng.
3.1.2.2 SystemPrng
BOOL SystemPrng(
unsigned char *pbRandomData,
size_t cbRandomData );
The SystemPrng() function fills a buffer with random bytes generated from output of NIST SP 800-90A
AES-256 counter mode based DRBG seeded from the Windows entropy pool. The Windows entropy pool
is populated from the following sources:
 An initial entropy value provided by the Windows OS Loader at boot time.
 The values of the high-resolution CPU cycle counter at times when hardware interrupts are
received.
 Random values gathered from the Trusted Platform Module (TPM), if one is available on the
system.
 Random values gathered by calling the RDRAND CPU instruction, if supported by the CPU.
The Windows DRBG infrastructure located in cng.sys continues to gather entropy from these sources
during normal operation, and the DRBG cascade is periodically reseeded with new entropy.
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3.1.2.3 EntropyRegisterSource
NTSTATUS EntropyRegisterSource(
ENTROPY_SOURCE_HANDLE * phEntropySource,
ENTROPY_SOURCE_TYPE entropySourceType,
PCWSTR entropySourceName );
This function is used to obtain a handle that can be used to contribute randomness to the Windows
entropy pool. The handle is returned in the phEntropySource parameter. For this function,
entropySource must be set to ENTROPY_SOURCE_TYPE_HIGH_PUSH, and entropySourceName must be
a Unicode string describing the entropy source.
3.1.2.4 EntropyUnregisterSource
NTSTATUS EntropyRegisterSource(
ENTROPY_SOURCE_HANDLE hEntropySource);
This function is used to destroy a handle created with EntropyRegisterSource().
3.1.2.5 EntropyProvideData
NTSTATUS EntropyProvideData(
ENTROPY_SOURCE_HANDLE hEntropySource,
PCBYTE pbData,
SIZE_T cbData,
ULONG entropyEstimateInMilliBits );
This function is used to contribute entropy to the Windows entropy pool. hEntropySource must be a
handle returned by an earlier call to EntropyRegisterSource. The caller provides cbData bytes in the
buffer pointed to by pbData, as well as an estimate (in the entropyEstimateInMilliBits parameter) of how
many millibits of entropy are contained in these bytes.
3.1.2.6 EntropyPoolTriggerReseedForIum
VOID EntropyPoolTriggerReseedForIum(BOOLEAN fPerformCallbacks);
This function will trigger a kernel DRBG reseed for the cng.sys inside the IUM (Isolated User Mode)
environment. If called inside the IUM environment, it triggers a reseed from one or more of the entropy
pools of the system. If called inside the normal world (non-IUM) environment, this function does
nothing.
3.1.3 Key and Key-Pair Generation
3.1.3.1 BCryptGenerateSymmetricKey
NTSTATUS WINAPI BCryptGenerateSymmetricKey(
BCRYPT_ALG_HANDLE hAlgorithm,
BCRYPT_KEY_HANDLE *phKey,
PUCHAR pbKeyObject,
ULONG cbKeyObject,
PUCHAR pbSecret,
ULONG cbSecret,
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ULONG dwFlags);
The BCryptGenerateSymmetricKey() function generates a symmetric key object directly from a DRBG for
use with a symmetric encryption algorithm or key derivation algorithm from a supplied key value. The
calling application must specify a handle to the algorithm provider created with the
BCryptOpenAlgorithmProvider() function. The algorithm specified when the provider was created must
support symmetric key encryption or key derivation.
3.1.3.2 BCryptGenerateKeyPair
NTSTATUS WINAPI BCryptGenerateKeyPair(
BCRYPT_ALG_HANDLE hAlgorithm,
BCRYPT_KEY_HANDLE *phKey,
ULONG dwLength,
ULONG dwFlags);
The BCryptGenerateKeyPair() function creates an empty public/private key pair. After creating a key
using this function, call the BCryptSetProperty() function to set its properties. The key pair can be used
only after BCryptFinalizeKeyPair() function is called.
3.1.3.3 BCryptFinalizeKeyPair
NTSTATUS WINAPI BCryptFinalizeKeyPair(
BCRYPT_KEY_HANDLE hKey,
ULONG dwFlags);
The BCryptFinalizeKeyPair() function completes a public/private key pair import or generation directly
from the output of a DRBG. The key pair cannot be used until this function has been called. After this
function has been called, the BCryptSetProperty() function can no longer be used for this key.
3.1.3.4 BCryptDuplicateKey
NTSTATUS WINAPI BCryptDuplicateKey(
BCRYPT_KEY_HANDLE hKey,
BCRYPT_KEY_HANDLE *phNewKey,
PUCHAR pbKeyObject,
ULONG cbKeyObject,
ULONG dwFlags);
The BCryptDuplicateKey() function creates a duplicate of a symmetric key.
3.1.3.5 BCryptDestroyKey
NTSTATUS WINAPI BCryptDestroyKey(
BCRYPT_KEY_HANDLE hKey);
The BCryptDestroyKey() function destroys the specified key.
3.1.4 Key Entry and Output
3.1.4.1 BCryptImportKey
NTSTATUS WINAPI BCryptImportKey(
BCRYPT_ALG_HANDLE hAlgorithm,
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BCRYPT_KEY_HANDLE hImportKey,
LPCWSTR pszBlobType,
BCRYPT_KEY_HANDLE *phKey,
PUCHAR pbKeyObject,
ULONG cbKeyObject,
PUCHAR pbInput,
ULONG cbInput,
ULONG dwFlags);
The BCryptImportKey() function imports a symmetric key from a key blob.
3.1.4.2 BCryptImportKeyPair
NTSTATUS WINAPI BCryptImportKeyPair(
BCRYPT_ALG_HANDLE hAlgorithm,
BCRYPT_KEY_HANDLE hImportKey,
LPCWSTR pszBlobType,
BCRYPT_KEY_HANDLE *phKey,
PUCHAR pbInput,
ULONG cbInput,
ULONG dwFlags);
The BCryptImportKeyPair() function is used to import a public/private key pair from a key blob.
3.1.4.3 BCryptExportKey
NTSTATUS WINAPI BCryptExportKey(
BCRYPT_KEY_HANDLE hKey,
BCRYPT_KEY_HANDLE hExportKey,
LPCWSTR pszBlobType,
PUCHAR pbOutput,
ULONG cbOutput,
ULONG *pcbResult,
ULONG dwFlags);
The BCryptExportKey() function exports a key to a memory blob that can be persisted for later use.
3.1.5 Encryption and Decryption
3.1.5.1 BCryptEncrypt
NTSTATUS WINAPI BCryptEncrypt(
BCRYPT_KEY_HANDLE hKey,
PUCHAR pbInput,
ULONG cbInput,
VOID *pPaddingInfo,
PUCHAR pbIV,
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ULONG cbIV,
PUCHAR pbOutput,
ULONG cbOutput,
ULONG *pcbResult,
ULONG dwFlags);
The BCryptEncrypt() function encrypts a block of data of given length.
3.1.5.2 BCryptDecrypt
NTSTATUS WINAPI BCryptDecrypt(
BCRYPT_KEY_HANDLE hKey,
PUCHAR pbInput,
ULONG cbInput,
VOID *pPaddingInfo,
PUCHAR pbIV,
ULONG cbIV,
PUCHAR pbOutput,
ULONG cbOutput,
ULONG *pcbResult,
ULONG dwFlags);
The BCryptDecrypt() function decrypts a block of data of given length.
3.1.6 Hashing and Message Authentication
3.1.6.1 BCryptCreateHash
NTSTATUS WINAPI BCryptCreateHash(
BCRYPT_ALG_HANDLE hAlgorithm,
BCRYPT_HASH_HANDLE *phHash,
PUCHAR pbHashObject,
ULONG cbHashObject,
PUCHAR pbSecret,
ULONG cbSecret,
ULONG dwFlags);
The BCryptCreateHash() function creates a hash object with an optional key. The optional key is used for
HMAC, AES GMAC and AES CMAC.
3.1.6.2 BCryptHashData
NTSTATUS WINAPI BCryptHashData(
BCRYPT_HASH_HANDLE hHash,
PUCHAR pbInput,
ULONG cbInput,
ULONG dwFlags);
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The BCryptHashData() function performs a one way hash on a data buffer. Call the BCryptFinishHash()
function to finalize the hashing operation to get the hash result.
3.1.6.3 BCryptDuplicateHash
NTSTATUS WINAPI BCryptDuplicateHash(
BCRYPT_HASH_HANDLE hHash,
BCRYPT_HASH_HANDLE *phNewHash,
PUCHAR pbHashObject,
ULONG cbHashObject,
ULONG dwFlags);
The BCryptDuplicateHash()function duplicates an existing hash object. The duplicate hash object
contains all state and data that was hashed to the point of duplication.
3.1.6.4 BCryptFinishHash
NTSTATUS WINAPI BCryptFinishHash(
BCRYPT_HASH_HANDLE hHash,
PUCHAR pbOutput,
ULONG cbOutput,
ULONG dwFlags);
The BCryptFinishHash() function retrieves the hash value for the data accumulated from prior calls to
BCryptHashData() function.
3.1.6.5 BCryptDestroyHash
NTSTATUS WINAPI BCryptDestroyHash(
BCRYPT_HASH_HANDLE hHash);
The BCryptDestroyHash() function destroys a hash object.
3.1.6.6 BCryptHash
NTSTATUS WINAPI BCryptHash(
BCRYPT_ALG_HANDLE hAlgorithm,
PUCHAR pbSecret,
ULONG cbSecret,
PUCHAR pbInput,
ULONG cbInput,
PUCHAR pbOutput,
ULONG cbOutput);
The function BCryptHash() performs a single hash computation. This is a convenience function that
wraps calls to the BCryptCreateHash(), BCryptHashData(), BCryptFinishHash(), and BCryptDestroyHash()
functions.
3.1.6.7 BCryptCreateMultiHash
NTSTATUS WINAPI BCryptCreateMultiHash(
BCRYPT_ALG_HANDLE hAlgorithm,
BCRYPT_HASH_HANDLE *phHash,
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ULONG nHashes,
PUCHAR pbHashObject,
ULONG cbHashObject,
PUCHAR pbSecret,
ULONG cbSecret,
ULONG dwFlags);
BCryptCreateMultiHash() is a function that creates a new MultiHash object that is used in parallel
hashing to improve performance. The MultiHash object is equivalent to an array of normal (reusable)
hash objects.
3.1.6.8 BCryptProcessMultiOperations
NTSTATUS WINAPI BCryptProcessMultiOperations(
BCRYPT_HANDLE hObject,
BCRYPT_MULTI_OPERATION_TYPE operationType,
PVOID pOperations,
ULONG cbOperations,
ULONG dwFlags );
The BCryptProcessMultiOperations() function is used to perform multiple operations on a single multi-
object handle such as a MultiHash object handle. If any of the operations fail, then the function will
return an error.
Each element of the operations array specifies an operation to be performed on/with the hObject.
For hash operations, there are two operation types:
 Hash data
 Finalize hash
These correspond directly to BCryptHashData() and BCryptFinishHash(). Each operation specifies an
index of the hash object inside the hObject MultiHash object that this operation applies to. Operations
are executed in any order or even in parallel, with the sole restriction that the set of operations that
specify the same index are all executed in-order.
3.1.7 Signing and Verification
3.1.7.1 BCryptSignHash
NTSTATUS WINAPI BCryptSignHash(
BCRYPT_KEY_HANDLE hKey,
VOID *pPaddingInfo,
PUCHAR pbInput,
ULONG cbInput,
PUCHAR pbOutput,
ULONG cbOutput,
ULONG *pcbResult,
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ULONG dwFlags);
The BCryptSignHash() function creates a signature of a hash value.
Note: this function accepts SHA-1 hashes, which according to NIST SP 800-131A is disallowed for digital
signature generation. SHA-1 is currently legacy-use for digital signature verification.
3.1.7.2 BCryptVerifySignature
NTSTATUS WINAPI BCryptVerifySignature(
BCRYPT_KEY_HANDLE hKey,
VOID *pPaddingInfo,
PUCHAR pbHash,
ULONG cbHash,
PUCHAR pbSignature,
ULONG cbSignature,
ULONG dwFlags);
The BCryptVerifySignature() function verifies that the specified signature matches the specified hash.
Note: this function accepts SHA-1 hashes, which according to NIST SP 800-131A is disallowed for digital
signature generation. SHA-1 is currently legacy-use for digital signature verification.
3.1.8 Secret Agreement and Key Derivation
3.1.8.1 BCryptSecretAgreement
NTSTATUS WINAPI BCryptSecretAgreement(
BCRYPT_KEY_HANDLE hPrivKey,
BCRYPT_KEY_HANDLE hPubKey,
BCRYPT_SECRET_HANDLE *phAgreedSecret,
ULONG dwFlags);
The BCryptSecretAgreement() function creates a secret agreement value from a private and a public
key. This function is used with Diffie-Hellman (DH) and Elliptic Curve Diffie-Hellman (ECDH) algorithms.
3.1.8.2 BCryptDeriveKey
NTSTATUS WINAPI BCryptDeriveKey(
BCRYPT_SECRET_HANDLE hSharedSecret,
LPCWSTR pwszKDF,
BCryptBufferDesc *pParameterList,
PUCHAR pbDerivedKey,
ULONG cbDerivedKey,
ULONG *pcbResult,
ULONG dwFlags);
The BCryptDeriveKey() function derives a key from a secret agreement value.
Note: When supporting a key agreement scheme that requires a nonce, BCryptDeriveKey uses
whichever nonce is supplied by the caller in the BCryptBufferDesc. Examples of the nonce types are
found in Section 5.4 of http://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-56Ar2.pdf
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When using a nonce, a random nonce should be used. And then if the random nonce is used, the
entropy (amount of randomness) of the nonce and the security strength of the DRBG has to be at least
one half of the minimum required bit length of the subgroup order.
For example:
for KAS FFC, entropy of nonce must be 112 bits for FB, 128 bits for FC.
for KAS ECC, entropy of the nonce must be 128 bits for EC, 192 for ED, 256 for EE.
3.1.8.3 BCryptDestroySecret
NTSTATUS WINAPI BCryptDestroySecret(
BCRYPT_SECRET_HANDLE hSecret);
The BCryptDestroySecret() function destroys a secret agreement handle that was created by using the
BCryptSecretAgreement() function.
3.1.8.4 BCryptKeyDerivation
NTSTATUS WINAPI BCryptKeyDerivation(
_In_ BCRYPT_KEY_HANDLE hKey,
_In_opt_ BCryptBufferDesc *pParameterList,
_Out_writes_bytes_to_(cbDerivedKey, *pcbResult) PUCHAR pbDerivedKey,
_In_ ULONG cbDerivedKey,
_Out_ ULONG *pcbResult,
_In_ ULONG dwFlags);
The BCryptKeyDerivation() function executes a Key Derivation Function (KDF) on a key generated with
BCryptGenerateSymmetricKey() function. It differs from the BCryptDeriveKey() function in that it does
not require a secret agreement step to create a shared secret.
3.1.8.5 BCryptDeriveKeyPBKDF2
NTSTATUS WINAPI BCryptDeriveKeyPBKDF2(
BCRYPT_ALG_HANDLE hPrf,
PUCHAR pbPassword,
ULONG cbPassword,
PUCHAR pbSalt,
ULONG cbSalt,
ULONGLONG cIterations,
PUCHAR pbDerivedKey,
ULONG cbDerivedKey,
ULONG dwFlags);
The BCryptDeriveKeyPBKDF2() function derives a key from a hash value by using the password based key
derivation function as defined by SP 800-132 PBKDF and IETF RFC 2898 (specified as PBKDF2).
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3.1.9 Cryptographic Transitions
3.1.9.1 DH and ECDH
Through the year 2010, implementations of DH and ECDH were allowed to have an acceptable bit
strength of at least 80 bits of security (for DH at least 1024 bits and for ECDH at least 160 bits). From
2011 through 2013, 80 bits of security strength was considered deprecated, and was disallowed starting
January 1, 2014. As of that date, only security strength of at least 112 bits is acceptable. ECDH uses
curve sizes of at least 256 bits (that means it has at least 128 bits of security strength), so that is
acceptable. However, DH has a range of 1024 to 4096 and that changed to 2048 to 4096 after 2013.
3.1.9.2 SHA-1
From 2011 through 2013, SHA-1 could be used in a deprecated mode for use in digital signature
generation. As of Jan. 1, 2014, SHA-1 is no longer allowed for digital signature generation, and it is
allowed for legacy use only for digital signature verification.
3.2 Control Input Interface
The Control Input Interface are the functions in Algorithm Providers and Properties. Options for control
operations are passed as input parameters to these functions.
3.3 Status Output Interface
The Status Output Interface for Kernel Mode Cryptographic Primitives Library is the return value from
each export function in the Kernel Mode Cryptographic Primitives Library.
3.4 Data Output Interface
The Data Output Interface for Kernel Mode Cryptographic Primitives Library consists of the Kernel Mode
Cryptographic Primitives Library export functions except for the Control Input Interfaces. Data is
returned to the function’s caller via output parameters.
3.5 Data Input Interface
The Data Input Interface for Kernel Mode Cryptographic Primitives Library consists of the Kernel Mode
Cryptographic Primitives Library export functions except for the Control Input Interfaces. Data and
options are passed to the interface as input parameters to the export functions. Data Input is kept
separate from Control Input by passing Data Input in separate parameters from Control Input.
3.6 Non-Security Relevant Configuration Interfaces
The following interfaces are not cryptographic functions and are used to configure cryptographic
providers on the system. Please see https://msdn.microsoft.com for details.
Function Name Description
BCryptEnumAlgorithms Enumerates the algorithms for a given set of operations.
BCryptEnumProviders Returns a list of CNG providers for a given algorithm.
BCryptRegisterConfigChangeNotify This is deprecated beginning with Windows 10.
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BCryptResolveProviders Resolves queries against the set of providers currently
registered on the local system and the configuration
information specified in the machine and domain
configuration tables, returning an ordered list of
references to one or more providers matching the
specified criteria.
BCryptAddContextFunctionProvider Adds a cryptographic function provider to the list of
providers that are supported by an existing CNG
context.
BCryptRegisterProvider Registers a CNG provider.
BCryptUnregisterProvider Unregisters a CNG provider.
BCryptUnregisterConfigChangeNotify Removes a CNG configuration change event handler.
This API differs slightly between User-Mode and Kernel-
Mode.
BCryptGetFipsAlgorithmMode
CngGetFipsAlgorithmMode
Determines whether Kernel Mode Cryptographic
Primitives Library is operating in FIPS mode. Some
applications use the value returned by this API to alter
their own behavior, such as blocking the use of some
SSL versions.
EntropyRegisterCallback Registers the callback function that will be called in a
worker thread after every reseed that the system
performs. The callback is merely informational.
BCryptQueryProviderRegistration Retrieves information about a CNG provider.
BCryptEnumRegisteredProviders Retrieves information about the registered providers.
BCryptCreateContext Creates a new CNG configuration context.
BCryptDeleteContext Deletes an existing CNG configuration context.
BCryptEnumContexts Obtains the identifiers of the contexts in the specified
configuration table.
BCryptConfigureContext Sets the configuration information for an existing CNG
context.
BCryptQueryContextConfiguration Retrieves the current configuration for the specified
CNG context.
BCryptAddContextFunction Adds a cryptographic function to the list of functions
that are supported by an existing CNG context.
BCryptRemoveContextFunction Removes a cryptographic function from the list of
functions that are supported by an existing CNG
context.
BCryptEnumContextFunctions Obtains the cryptographic functions for a context in the
specified configuration table.
BCryptConfigureContextFunction Sets the configuration information for the cryptographic
function of an existing CNG context.
BCryptQueryContextFunctionConfiguration Obtains the cryptographic function configuration
information for an existing CNG context.
BCryptEnumContextFunctionProviders Obtains the providers for the cryptographic functions
for a context in the specified configuration table.
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BCryptSetContextFunctionProperty Sets the value of a named property or a cryptographic
function in an existing CNG context.
BCryptQueryContextFunctionProperty Obtains the value of a named property for a
cryptographic function in an existing CNG context.
BCryptSetAuditingInterface Sets the auditing interface.
4 Roles, Services and Authentication
4.1 Roles
Kernel Mode Cryptographic Primitives Library is a kernel-mode driver that does not interact with the
user through any service therefore the module’s functions are fully automatic and not configurable. FIPS
140 validations define formal “User” and “Cryptographic Officer” roles. Both roles can use any of this
module’s services.
4.2 Services
Kernel Mode Cryptographic Primitives Library services are:
1. Algorithm Providers and Properties – This module provides interfaces to register algorithm
providers
2. Random Number Generation
3. Key and Key-Pair Generation
4. Key Entry and Output
5. Encryption and Decryption
6. Hashing and Message Authentication
7. Signing and Verification
8. Secret Agreement and Key Derivation
9. Show Status
10. Self-Tests - The module provides a power-up self-tests service that is automatically executed
when the module is loaded into memory. See Self-Tests.
11. Zeroizing Cryptographic Material - See Cryptographic Key Management
4.2.1 Mapping of Services, Algorithms, and Critical Security Parameters
The following table maps the services to their corresponding algorithms and critical security parameters
(CSPs).
Service Algorithms CSPs
Algorithm Providers and
Properties
None None
Random Number Generation AES-256 CTR DRBG
NDRNG (allowed, used to provide
entropy to DRBG)
AES-CTR DRBG Seed
AES-CTR DRBG Entropy Input
AES-CTR DRBG V
AES-CTR DRBG Key
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Key and Key-Pair Generation RSA, DH, ECDH, ECDSA, RC2, RC4,
DES, Triple-DES, AES, and HMAC
(RC2, RC4, and DES cannot be
used in FIPS mode.)
Symmetric Keys
Asymmetric Public Keys
Asymmetric Private Keys
Key Entry and Output SP 800-38F AES Key Wrapping
(128, 192, and 256)
Symmetric Keys
Asymmetric Public Keys
Asymmetric Private Keys
Encryption and Decryption  Triple-DES with 2 key
(encryption disallowed) and 3
key in ECB, CBC, CFB8 and
CFB64 modes;
 AES-128, AES-192, and AES-
256 in ECB, CBC, CFB8,
CFB128, and CTR modes;
 AES-128, AES-192, and AES-
256 in CCM, CMAC, and
GMAC modes;
 AES-128, AES-192, and AES-
256 GCM decryption;
 NIST SP XTS-AES XTS-128 and
XTS-256;
 SP 800-56B RSADP mod 2048
(IEEE 1619-2007 XTS-AES, AES
GCM encryption, RC2, RC4, RSA,
and DES, which cannot be used in
FIPS mode)
Symmetric Keys
Asymmetric Public Keys
Asymmetric Private Keys
Hashing and Message
Authentication
 FIPS 180-4 SHS SHA-1, SHA-
256, SHA-384, and SHA-512;
 FIPS 180-4 SHA-1, SHA-256,
SHA-384, SHA-512 HMAC;
 AES-128, AES-192, and AES-
256 in CCM, CMAC, and
GMAC;
 MD5 and HMAC-MD5
(allowed in TLS and EAP-TLS);
 MD2 and MD4 (disallowed in
FIPS mode)
Symmetric Keys (for HMAC,
AES CCM, AES CMAC, and
AES GMAC)
Signing and Verification  FIPS 186-4 RSA (RSASSA-
PKCS1-v1_5 and RSASSA-PSS)
digital signature generation
and verification with 2048
and 3072 modulus;
supporting SHA-113
, SHA-256,
SHA-384, and SHA-512
Asymmetric Public Keys
Asymmetric RSA Private Keys
Asymmetric ECDSA Public
Keys
Asymmetric ECDSA Private
keys
13
SHA-1 is only acceptable for legacy signature verification.
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 FIPS 186-4 ECDSA with the
following NIST curves: P-256,
P-384, P-521
Secret Agreement and Key
Derivation
 KAS – SP 800-56A Diffie-
Hellman Key Agreement;
Finite Field Cryptography
(FFC)
 KAS – SP 800-56A EC Diffie-
Hellman Key Agreement with
the following NIST curves: P-
256, P-384, P-521 and the
FIPS non-Approved curves
listed in Non-Approved
Algorithms
 SP 800-108 Key Derivation
Function (KDF) CMAC-AES
(128, 192, 256), HMAC
(SHA1, SHA-256, SHA-384,
SHA-512)
 SP 800-132 PBKDF
 SP 800-135 IKEv1 and IKEv2
KDF primitives
 Legacy CAPI KDF (cannot be
used in FIPS mode)
 HKDF (cannot be used in FIPS
mode)
DH Private and Public Values
ECDH Private and Public
Values
Show Status None None
Self-Tests See Section 8 Self-Tests for the
list of algorithms
None
Zeroizing Cryptographic Material None None
4.2.2 Mapping of Services, Export Functions, and Invocations
The following table maps the services to their corresponding export functions and invocations.
Service Export Functions Invocations
Algorithm Providers and
Properties
BCryptOpenAlgorithmProvider
BCryptCloseAlgorithmProvider
BCryptSetProperty
BCryptGetProperty
BCryptFreeBuffer
This service is executed
whenever one of these
exported functions is called.
Random Number Generation BcryptGenRandom
SystemPrng
EntropyRegisterSource
EntropyUnregisterSource
EntropyProvideData
This service is executed
whenever one of these
exported functions is called.
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EntropyPoolTriggerReseedForIum
Key and Key-Pair Generation BCryptGenerateSymmetricKey
BCryptGenerateKeyPair
BCryptFinalizeKeyPair
BCryptDuplicateKey
BCryptDestroyKey
This service is executed
whenever one of these
exported functions is called.
Key Entry and Output BCryptImportKey
BCryptImportKeyPair
BCryptExportKey
This service is executed
whenever one of these
exported functions is called.
Encryption and Decryption BCryptEncrypt
BCryptDecrypt
This service is executed
whenever one of these
exported functions is called.
Hashing and Message
Authentication
BCryptCreateHash
BCryptHashData
BCryptDuplicateHash
BCryptFinishHash
BCryptDestroyHash
BCryptHash
BCryptCreateMultiHash
BCryptProcessMultiOperations
This service is executed
whenever one of these
exported functions is called.
Signing and Verification BCryptSignHash
BCryptVerifySignature
This service is executed
whenever one of these
exported functions is called.
Secret Agreement and Key
Derivation
BCryptSecretAgreement
BCryptDeriveKey
BCryptDestroySecret
BCryptKeyDerivation
BCryptDeriveKeyPBKDF2
This service is executed
whenever one of these
exported functions is called.
Show Status All Exported Functions This service is executed upon
completion of an exported
function.
Self-Tests DriverEntry This service is executed upon
startup of this module.
Zeroizing Cryptographic Material BCryptDestroyKey
BCryptDestroySecret
This service is executed
whenever one of these
exported functions is called.
4.2.3 Non-Approved Services
The following table lists other non-security relevant or non-approved APIs exported from the crypto
module.
Function Name Description
BCryptDeriveKeyCapi Derives a key from a hash value. This function is provided
as a helper function to assist in migrating from legacy
Cryptography API (CAPI) to CNG.
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BCRYPT_KDF_HKDF Derives a key from a hash value. This function is provided
to support potential enhancements to Windows.
SslDecryptPacket
SslEncryptPacket
SslExportKey
SslFreeObject
SslImportKey
SslLookupCipherLengths
SslLookupCipherSuiteInfo
SslOpenProvider
SslIncrementProviderReferenceCount
SslDecrementProviderReferenceCount
Supports Secure Sockets Layer (SSL) protocol
functionality. These functions are non-approved.
4.3 Authentication
The module does not provide authentication. Roles are implicitly assumed based on the services that
are executed.
5 Finite State Model
5.1 Specification
The following diagram shows the finite state model for Kernel Mode Cryptographic Primitives Library:
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6 Operational Environment
The operational environment for Kernel Mode Cryptographic Primitives Library is the Windows 10
operating system running on a supported hardware platform.
6.1 Single Operator
The for Kernel Mode Cryptographic Primitives Library is loaded into kernel memory as part of the boot
process and before the logon component is initialized. The “single operator” for the module is the
Windows Kernel.
6.2 Cryptographic Isolation
In the Windows operating system, all kernel-mode modules, including CNG.SYS, are loaded into the
Windows Kernel (ntoskrnl.exe) which executes as a single process. The Windows operating system
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environment enforces process isolation from user-mode processes including memory and CPU
scheduling between the kernel and user-mode processes.
6.3 Integrity Chain of Trust
Modules running in the Windows OS environment provide integrity verification through different
mechanisms depending on when the module loads in the OS load sequence and also on the hardware
and OS configuration. The following diagrams describe the Integrity Chain of trust for each supported
configuration that impacts integrity checks:
BCryptPrimitives.dll
BitLocker Dump
Filter
(DumpFVE.sys)
Virtual TPM
(TPMEng.dll)
Code Integrity
(CI.dll)
Secure Kernel Code
Integrity (SKCI.dll)
CNG.sys
Windows Resume (WinResume.efi)
Windows OS Loader (WinLoad.efi)
Boot Manager (BootMgr.efi)
UEFI
When Secure Boot is enabled, UEFI validates
Not enabled
Enabled
Memory Integrity
Core Isolation not enabled
Core Isolation enabled
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The Windows OS Loader checks the integrity of Kernel Mode Cryptographic Primitives Library before it is
loaded into ntoskrnl.exe.
Windows binaries include a SHA-256 hash of the binary signed with the 2048 bit Microsoft RSA code-
signing key (i.e., the key associated with the Microsoft code-signing certificate). The integrity check uses
the public key component of the Microsoft code signing certificate to verify the signed hash of the
binary.
7 Cryptographic Key Management
The Kernel Mode Cryptographic Primitives Library crypto module uses the following critical security
parameters (CSPs) for FIPS Approved security functions:
Security Relevant Data Item Description
Symmetric encryption/decryption keys Keys used for AES or Triple-DES
encryption/decryption. Key sizes for AES are 128,
192, and 256 bits, and key sizes for Triple-DES are
192 and 128 bits.
HMAC keys Keys used for HMAC-SHA1, HMAC-SHA256, HMAC-
SHA384, and HMAC-SHA512
Asymmetric ECDSA Public Keys Keys used for the verification of ECDSA digital
signatures. Curve sizes are P-256, P-384, and P-
521.
Asymmetric ECDSA Private Keys Keys used for the calculation of ECDSA digital
signatures. Curve sizes are P-256, P-384, and P-
521.
Asymmetric RSA Public Keys Keys used for the verification of RSA digital
signatures. Key sizes are 2048 and 3072 bits. These
keys can be produced using RSA Key Generation.
Asymmetric RSA Private Keys Keys used for the calculation of RSA digital
signatures. Key sizes are 2048 and 3072 bits. These
keys can be produced using RSA Key Generation.
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AES-CTR DRBG Entropy Input A secret value that is at least 256 bits and
maintained internal to the module that provides
the entropy material for AES-CTR DRBG output14
AES-CTR DRBG Seed A 384 bit secret value maintained internal to the
module that provides the seed material for AES-
CTR DRBG output15
AES-CTR DRBG V A 128 bit secret value maintained internal to the
module that provides the entropy material for
AES-CTR DRBG output16
AES-CTR DRBG Key A 256 bit secret value maintained internal to the
module that provides the entropy material for
AES-CTR DRBG output17
DH Private and Public values Private and public values used for Diffie-Hellman
key establishment. Key sizes are 2048 to 4096 bits.
ECDH Private and Public values Private and public values used for EC Diffie-
Hellman key establishment. Curve sizes are P-256,
P-384, and P-521 and the ones listed in section 2.3.
7.1 Access Control Policy
The Kernel Mode Cryptographic Primitives Library crypto module allows controlled access to the security
relevant data items contained within it. The following table defines the access that a service has to
each. The permissions are categorized as a set of four separate permissions: read (r), write (w), execute
(x), delete (d). If no permission is listed, the service has no access to the item.
Kernel Mode Cryptographic Primitives
Library crypto module
Service Access Policy
Symmetric
encryption/decryption
keys
HMAC
keys
Asymmetric
ECDSA
Public
keys
Asymmetric
ECDSA
Private
keys
Asymmetric
RSA
Public
Keys
Asymmetric
RSA
Private
Keys
DH
Public
and
Private
values
ECDH
Public
and
Private
values
AES-CTR
DRBG
Seed,
AES-CTR
DRBG
Entropy
Input,
AES-CTR
DRBG
V,
&
AES-
CTR
DRBG
key
Algorithm Providers and Properties
Random Number Generation x
Key and Key-Pair Generation wd wd wd wd wd wd wd wd x
14
Microsoft Common Criteria Windows Security Target, Page 29.
15
Recommendation for Random Number Generation Using Deterministic Random Bit Generators, NIST SP 800-90A
Revision 1, page 49.
16
Ibid.
17
Ibid.
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Key Entry and Output rw rw rw rw rw rw rw rw
Encryption and Decryption x
Hashing and Message Authentication wx
Signing and Verification x x x x x
Secret Agreement and Key Derivation x x x
Show Status
Self-Tests
Zeroizing Cryptographic Material wd wd wd wd wd wd wd wd wd
7.2 Key Material
When Kernel Mode Cryptographic Primitives Library is loaded in the Windows 10 operating system
kernel, no keys exist within it. A kernel module is responsible for importing keys into Kernel Mode
Cryptographic Primitives Library or using Kernel Mode Cryptographic Primitives Library’s functions to
generate keys.
7.3 Key Generation
Kernel Mode Cryptographic Primitives Library can create and use keys for the following algorithms: RSA,
DH, ECDH, ECDSA, RC2, RC4, DES, Triple-DES, AES, and HMAC. However, RC2, RC4, and DES cannot be
used in FIPS mode.
Random keys can be generated by calling the BCryptGenerateSymmetricKey() and
BCryptGenerateKeyPair() functions. Random data generated by the BCryptGenRandom() function is
provided to BCryptGenerateSymmetricKey() function to generate symmetric keys. DES, Triple-DES, AES,
RSA, ECDSA, DH, and ECDH keys and key-pairs are generated following the techniques given in SP 800-
56Ar2 (Section 5.8.1).
Keys generated while not operating in the FIPS mode of operation cannot be used in FIPS mode, and
vice versa.
7.4 Key Establishment
Kernel Mode Cryptographic Primitives Library can use FIPS approved Diffie-Hellman key agreement (DH),
Elliptic Curve Diffie-Hellman key agreement (ECDH), RSA key transport and manual methods to establish
keys. Alternatively, the module can also use Approved KDFs to derive key material from a specified
secret value or password.
Kernel Mode Cryptographic Primitives Library can use the following FIPS Approved key derivation
functions (KDF) from the common secret that is established during the execution of DH and ECDH key
agreement algorithms:
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 BCRYPT_KDF_SP80056A_CONCAT. This KDF supports the Concatenation KDF as specified in SP
800-56A (Section 5.8.1).
 BCRYPT_KDF_HASH. This KDF supports FIPS approved SP800-56A (Section 5.8), X9.63, and X9.42
key derivation.
 BCRYPT_KDF_HMAC. This KDF supports the IPsec IKEv1 key derivation that is non-Approved but
is an allowed legacy implementation in FIPS mode when used to establish keys for IKEv1 as per
scenario 4 of IG D.8.
Kernel Mode Cryptographic Primitives Library can use the following FIPS Approved key derivation
functions (KDF) from a specified secret or password:
 BCRYPT_SP80056A_CONCAT_ALGORITHM. This KDF supports the Concatenation KDF as
specified in SP 800-56Ar2 (Section 5.8.1).
 BCRYPT_SP800108_CTR_HMAC_ALGORITHM. This KDF supports the counter-mode variant of
the KDF specified in SP 800-108 (Section 5.1) with HMAC as the underlying PRF.
 BCRYPT_PBKDF2_ALGORITHM. This KDF supports the Password Based Key Derivation Function
specified in SP 800-132 (Section 5.3).
In addition, the industry standard KDF, HKDF (CNG flag BCRYPT_KDF_HKDF), and the legacy proprietary
CryptDerive Key KDF, (BCRYPT_CAPI_KDF_ALGORITHM, described at
https://msdn.microsoft.com/library/windows/desktop/aa379916.aspx). cannot be used in a FIPS
approved mode.
7.4.1 NIST SP 800-132 Password Based Key Derivation Function (PBKDF)
There are two options presented in NIST SP 800-132, pages 8 – 10, that are used to derive the Data
Protection Key (DPK) from the Master Key. With the Kernel Mode Cryptographic Primitives Library, it is
up to the caller to select the option to generate/protect the DPK. For example, DPAPI uses option
2a. Kernel Mode Cryptographic Primitives Library provides all the building blocks for the caller to select
the desired option.
The Kernel Mode Cryptographic Primitives Library supports the following HMAC hash functions as
parameters for PBKDF:
 SHA-1 HMAC
 SHA-256 HMAC
 SHA-384 HMAC
 SHA-512 HMAC
Keys derived from passwords, as described in SP 800-132, may only be used for storage applications. In
order to run in a FIPS Approved manner, strong passwords must be used and they may only be used for
storage applications. The password/passphrase length is enforced by the caller of the PBKDF interfaces
when the password/passphrase is created and not by this cryptographic module.18
18
The probability of guessing a password is determined by its length and complexity, an organization should define
a policy for these based based their threat model, suh as the example guidance in NIST SP800-63b, Appendix A.
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7.4.2 NIST SP 800-38F AES Key Wrapping
As outlined in FIPS 140-2 IG, D.2 and D.9, AES key wrapping serves as a form of key transport, which in
turn is a form of key establishment. This implementation of AES key wrapping is in accordance with NIST
SP 800-38F Recommendation for Block Cipher Modes of Operation: Methods for Key Wrapping.
7.5 Key Entry and Output
Keys can be both exported and imported out of and into Kernel Mode Cryptographic Primitives Library
via BCryptExportKey(), BCryptImportKey(), and BCryptImportKeyPair() functions.
Symmetric key entry and output can also be done by exchanging keys using the recipient’s asymmetric
public key via BCryptSecretAgreement() and BCryptDeriveKey() functions.
Exporting the RSA private key by supplying a blob type of BCRYPT_PRIVATE_KEY_BLOB,
BCRYPT_RSAFULLPRIVATE_BLOB, or BCRYPT_RSAPRIVATE_BLOB to BCryptExportKey() is not allowed in
FIPS mode.
7.6 Key Storage
Kernel Mode Cryptographic Primitives Library does not provide persistent storage of keys.
7.7 Key Archival
Kernel Mode Cryptographic Primitives Library does not directly archive cryptographic keys. A user may
choose to export a cryptographic key (cf. “Key Entry and Output” above), but management of the secure
archival of that key is the responsibility of the user. All key copies inside Kernel Mode Cryptographic
Primitives Library are destroyed and their memory location zeroized after used. It is the caller’s
responsibility to maintain the security of keys when the keys are outside Kernel Mode Cryptographic
Primitives Library.
7.8 Key Zeroization
All keys are destroyed and their memory location zeroized when the operator calls BCryptDestroyKey()
or BCryptDestroySecret() on that key handle.
8 Self-Tests
8.1 Power-On Self-Tests
The Kernel Mode Cryptographic Primitives Library module implements Known Answer Test (KAT)
functions when the module is loaded into ntoskrnl.exe at boot time and the default driver entry point,
DriverEntry, is called.
Kernel Mode Cryptographic Primitives Library performs the following power-on (startup) self-tests:
 HMAC (SHA-1, SHA-256, and SHA-512) Known Answer Tests
 Triple-DES encrypt/decrypt ECB Known Answer Tests
 AES-128 encrypt/decrypt ECB Known Answer Tests
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 AES-128 encrypt/decrypt CCM Known Answer Tests
 AES-128 encrypt/decrypt CBC Known Answer Tests
 AES-128 CMAC Known Answer Test
 AES-128 encrypt/decrypt GCM Known Answer Tests
 XTS-AES encrypt/decrypt Known Answer Tests
 RSA sign/verify Known Answer Tests using RSA_SHA256_PKCS1 signature generation and
verification
 ECDSA sign/verify Known Answer Tests on P256 curve
 DH secret agreement Known Answer Test with 2048-bit key
 ECDH secret agreement Known Answer Test on P256 curve
 SP 800-90A AES-256 counter mode DRBG Known Answer Tests (instantiate, generate and
reseed)
 SP 800-108 KDF Known Answer Test
 SP 800-132 PBKDF Known Answer Test
 SHA-256 Known Answer Test
 SHA-512 Known Answer Test
 SP800-135 TLS 1.0/1.1 KDF Known Answer Test
 SP800-135 TLS 1.2 KDF Known Answer Test
 IKE SP800_135 KDF Known Answer Test
In any self-test fails, the Kernel Mode Cryptographic Primitives Library module does not load, an error
code is returned to ntoskrnl.exe, and the computer will fail to boot.
8.2 Conditional Self-Tests
Kernel Mode Cryptographic Primitives Library performs pair-wise consistency checks upon each
invocation of RSA, ECDH, and ECDSA key-pair generation and import as defined in FIPS 140-2.
ECDH key usage assurances are performed according to NIST SP 800-56A sections 5.5.2, 5.6.2, and 5.6.3.
A Continuous Random Number Generator Test (CRNGT) and the DRBG health tests are performed for SP
800-90A AES-256 CTR DRBG.
A CRNGT is performed for the non-approved NDRNG per FIPS 140-2 IG 9.8.
When BCRYPT_ENABLE_INCOMPATIBLE_FIPS_CHECKS flag (required by policy) is used with
BCryptGenerateSymmetricKey, then the XTS-AES Key_1 ≠ Key_2 check is performed in compliance with
FIPS 140-2 IG A.9.
If the conditional self-test fails the function returns the status code STATUS_INTERNAL_ERROR.
9 Design Assurance
The secure installation, generation, and startup procedures of this cryptographic module are part of the
overall operating system secure installation, configuration, and startup procedures for the Windows 10
operating system.
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The Windows 10 operating system must be pre-installed on a computer by an OEM, installed by the
end-user, by an organization’s IT administrator, or updated from a previous Windows 10 version
downloaded from Windows Update.
An inspection of authenticity of the physical medium can be made by following the guidance at this
Microsoft web site: https://www.microsoft.com/en-us/howtotell/default.aspx
The installed version of Windows 10 must be verified to match the version that was validated. See
Appendix A – How to Verify Windows Versions and Digital Signatures for details on how to do this.
For Windows Updates, the client only accepts binaries signed by Microsoft certificates. The Windows
Update client only accepts content whose SHA-2 hash matches the SHA-2 hash specified in the
metadata. All metadata communication is done over a Secure Sockets Layer (SSL) port. Using SSL
ensures that the client is communicating with the real server and so prevents a spoof server from
sending the client harmful requests. The version and digital signature of new cryptographic module
releases must be verified to match the version that was validated. See Appendix A – How to Verify
Windows Versions and Digital Signatures for details on how to do this.
10 Mitigation of Other Attacks
The following table lists the mitigations of other attacks for this cryptographic module:
Algorithm Protected Against Mitigation
SHA1 Timing Analysis Attack Constant time implementation
Cache Attack Memory access pattern is independent of any confidential data
SHA2 Timing Analysis Attack Constant time implementation
Cache Attack Memory access pattern is independent of any confidential data
Triple-DES Timing Analysis Attack Constant time implementation
AES Timing Analysis Attack Constant time implementation
Cache Attack Memory access pattern is independent of any confidential data
Protected against cache attacks only when used with AES NI
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11 Security Levels
The security level for each FIPS 140-2 security requirement is given in the following table.
Security Requirement Security Level
Cryptographic Module Specification 1
Cryptographic Module Ports and Interfaces 1
Roles, Services, and Authentication 1
Finite State Model 1
Physical Security NA
Operational Environment 1
Cryptographic Key Management 1
EMI/EMC 1
Self-Tests 1
Design Assurance 2
Mitigation of Other Attacks 1
12 Additional Details
For the latest information on Microsoft Windows, check out the Microsoft web site at:
https://www.microsoft.com/en-us/windows
For more information about FIPS 140 validations of Microsoft products, please see:
https://docs.microsoft.com/en-us/windows/security/threat-protection/fips-140-validation
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13 Appendix A – How to Verify Windows Versions and Digital Signatures
13.1 How to Verify Windows Versions
The installed version of Windows 10 OEs must be verified to match the version that was validated using
the following method:
1. In the Search box type "cmd" and open the Command Prompt desktop app.
2. The command window will open.
3. At the prompt, enter "ver”.
4. The version information will be displayed in a format like this:
Microsoft Windows [Version 10.0.xxxxx]
If the version number reported by the utility matches the expected output, then the installed version
has been validated to be correct.
13.2 How to Verify Windows Digital Signatures
After performing a Windows Update that includes changes to a cryptographic module, the digital
signature and file version of the binary executable file must be verified. This is done like so:
1. Open a new window in Windows Explorer.
2. Type “C:\Windows\” in the file path field at the top of the window.
3. Type the cryptographic module binary executable file name (for example, “CNG.SYS”) in the
search field at the top right of the window, then press the Enter key.
4. The file will appear in the window.
5. Right click on the file’s icon.
6. Select Properties from the menu and the Properties window opens.
7. Select the Details tab.
8. Note the File version Property and its value, which has a number in this format: xx.x.xxxxx.xxxx.
9. If the file version number matches one of the version numbers that appear at the start of this
security policy document, then the version number has been verified.
10. Select the Digital Signatures tab.
11. In the Signature list, select the Microsoft Windows signer.
12. Click the Details button.
13. Under the Digital Signature Information, you should see: “This digital signature is OK.” If that
condition is true, then the digital signature has been verified.
Kernel Mode Cryptographic Primitives Library Security Policy Document
© 2019 Microsoft. All Rights Reserved Page 49 of 50
This Security Policy is non-proprietary and may be reproduced only in its original entirety (without revision).
14 Appendix B – References
This table lists the specifications for each elliptic curve in section 2.3
Curve Specification
Curve25519 https://cr.yp.to/ecdh/curve25519-20060209.pdf
brainpoolP160r1 http://www.ecc-brainpool.org/download/Domain-parameters.pdf
brainpoolP192r1 http://www.ecc-brainpool.org/download/Domain-parameters.pdf
brainpoolP192t1 http://www.ecc-brainpool.org/download/Domain-parameters.pdf
brainpoolP224r1 http://www.ecc-brainpool.org/download/Domain-parameters.pdf
brainpoolP224t1 http://www.ecc-brainpool.org/download/Domain-parameters.pdf
brainpoolP256r1 http://www.ecc-brainpool.org/download/Domain-parameters.pdf
brainpoolP256t1 http://www.ecc-brainpool.org/download/Domain-parameters.pdf
brainpoolP320r1 http://www.ecc-brainpool.org/download/Domain-parameters.pdf
brainpoolP320t1 http://www.ecc-brainpool.org/download/Domain-parameters.pdf
brainpoolP384r1 http://www.ecc-brainpool.org/download/Domain-parameters.pdf
brainpoolP384t1 http://www.ecc-brainpool.org/download/Domain-parameters.pdf
brainpoolP512r1 http://www.ecc-brainpool.org/download/Domain-parameters.pdf
brainpoolP512t1 http://www.ecc-brainpool.org/download/Domain-parameters.pdf
ec192wapi http://www.gbstandards.org/GB_standards/GB_standard.asp?id=900
(The GB standard is available here for purchase)
nistP192 http://csrc.nist.gov/groups/ST/toolkit/documents/dss/NISTReCur.pdf
nistP224 http://csrc.nist.gov/groups/ST/toolkit/documents/dss/NISTReCur.pdf
numsP256t1 https://www.microsoft.com/en-us/research/wp-
content/uploads/2016/02/curvegen.pdf
numsP384t1 https://www.microsoft.com/en-us/research/wp-
content/uploads/2016/02/curvegen.pdf
numsP512t1 https://www.microsoft.com/en-us/research/wp-
content/uploads/2016/02/curvegen.pdf
secP160k1 http://www.secg.org/sec2-v2.pdf
secP160r1 http://www.secg.org/sec2-v2.pdf
secP160r2 http://www.secg.org/sec2-v2.pdf
secP192k1 http://www.secg.org/sec2-v2.pdf
secP192r1 http://www.secg.org/sec2-v2.pdf
secP224k1 http://www.secg.org/sec2-v2.pdf
secP224r1 http://www.secg.org/sec2-v2.pdf
secP256k1 http://www.secg.org/sec2-v2.pdf
secP256r1 http://www.secg.org/sec2-v2.pdf
secP384r1 http://www.secg.org/sec2-v2.pdf
secP521r1 http://www.secg.org/sec2-v2.pdf
wtls12 http://www.openmobilealliance.org/tech/affiliates/wap/wap-261-wtls-
20010406-a.pdf
wtls7 http://www.openmobilealliance.org/tech/affiliates/wap/wap-261-wtls-
20010406-a.pdf
wtls9 http://www.openmobilealliance.org/tech/affiliates/wap/wap-261-wtls-
20010406-a.pdf
Kernel Mode Cryptographic Primitives Library Security Policy Document
© 2019 Microsoft. All Rights Reserved Page 50 of 50
This Security Policy is non-proprietary and may be reproduced only in its original entirety (without revision).
Curve Specification
x962P192v1 https://global.ihs.com/doc_detail.cfm?&item_s_key=00325725&item_key_d
ate=941231&input_doc_number=ANSI%20X9%2E62&input_doc_title=
(The ANSI X9.62 standard is available here for purchase)
x962P192v2 https://global.ihs.com/doc_detail.cfm?&item_s_key=00325725&item_key_d
ate=941231&input_doc_number=ANSI%20X9%2E62&input_doc_title=
(The ANSI X9.62 standard is available here for purchase)
x962P192v3 https://global.ihs.com/doc_detail.cfm?&item_s_key=00325725&item_key_d
ate=941231&input_doc_number=ANSI%20X9%2E62&input_doc_title=
(The ANSI X9.62 standard is available here for purchase)
x962P239v1 https://global.ihs.com/doc_detail.cfm?&item_s_key=00325725&item_key_d
ate=941231&input_doc_number=ANSI%20X9%2E62&input_doc_title=
(The ANSI X9.62 standard is available here for purchase)
x962P239v2 https://global.ihs.com/doc_detail.cfm?&item_s_key=00325725&item_key_d
ate=941231&input_doc_number=ANSI%20X9%2E62&input_doc_title=
(The ANSI X9.62 standard is available here for purchase)
x962P239v3 https://global.ihs.com/doc_detail.cfm?&item_s_key=00325725&item_key_d
ate=941231&input_doc_number=ANSI%20X9%2E62&input_doc_title=
(The ANSI X9.62 standard is available here for purchase)
x962P256v1 https://global.ihs.com/doc_detail.cfm?&item_s_key=00325725&item_key_d
ate=941231&input_doc_number=ANSI%20X9%2E62&input_doc_title=
(The ANSI X9.62 standard is available here for purchase)