CNG Cryptographic Algorithm Providers

Unlike Cryptography API (CryptoAPI), Cryptography API: Next Generation (CNG) separates cryptographic providers from key storage providers. Basic cryptographic algorithm operations such as hashing and signing are called primitive operations or simply primitives. CNG includes a provider that implements the following algorithms.

Symmetric Algorithms

Name Supported modes Key size in bits (Default/Min/Max)
Advanced Encryption Standard (AES) ECB, CBC, CFB8, CFB128, GCM, CCM, GMAC, CMAC, AES Key Wrap, XTS
Windows 8: Support for the CFB128 and CMAC modes begins.
Windows 10: Support for XTS-AES moode begins.
128/192/256
Data Encryption Standard (DES) ECB, CBC, CFB8, CFB64
Windows 8: Support for the CFB64 mode begins.
56/56/56
Data Encryption Standard XORed(DESX) ECB, CBC, CFB8, CFB64
Windows 8: Support for the CFB64 mode begins.
192/192/192
Triple Data Encryption Standard (3DES) ECB, CBC, CFB8, CFB64
Windows 8: Support for the CFB64 mode begins.
112/168
RSA Data Security 2 (RC2) ECB, CBC, CFB8, CFB64 modes are supported.
Windows 8: Support for the CFB64 mode begins.
16 to 128 in 8 bit increments
RSA Data Security 4 (RC4) 8 to 512, in 8-bit increments

Asymmetric Algorithms

Name Notes Key size in bits (Default/Min/Max)
Digital Signature Algorithm (DSA) Implementation conforms to FIPS 186-3 for key sizes between 1024 and 3072 bits.
Implementation conforms to FIPS 186-2 for key sizes from 512 to 1024 bits.
512 to 3072, in 64-bit increments
Windows 8: Support for the a 3072 bit key begins.
RSA Includes RSA algorithms that use PKCS1, Optimal Asymmetric Encryption Padding (OAEP) encoding or padding, or Probabilistic Signature Scheme (PSS) plaintext padding 512 to 16384, in 64-bit increments

Hashing Algorithms

Name Notes Key size in bits (Default/Min/Max)
Secure Hash Algorithm 1 (SHA1) Includes HmacSha1 160/160/160
Secure Hash Algorithm 256 (SHA256) Includes HmacSha256 256/256/256
Secure Hash Algorithm 384 (SHA384) Includes HmacSha384 384/384/384
Secure Hash Algorithm 512 (SHA512) Includes HmacSha512 512/512/512
Message Digest 2 (MD2) Includes HmacMd2 128/128/128
Message Digest 4 (MD4) Includes HmacMd4 128/128/128
Message Digest 5 (MD5) Includes HmacMd5 128/128/128

Key Exchange Algorithms

Algorithm name Notes Key size in bits (Default/Min/Max)
Diffie-Hellman Key Exchange Algorithm 512 to 4096, in 64-bit increments
Elliptic Curve Diffie-Hellman (ECDH) Includes curves that use 256, 384 and 521 bit public keys as specified in SP800-56A. 256/384/521
Elliptic Curve Digital Signature Algorithm (ECDSA) Includes curves that use 256, 384 and 521 bit public keys as specified in FIPS 186-3.
[!Note]
To display all named elliptic curves, use certutil displayEccCurve.

256/384/521

CNG Algorithm Identifiers

CNG Cryptographic Primitive Functions

Understanding Cryptographic Providers