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The ALG_ID data type specifies an algorithm identifier. Parameters of this data type are passed to most of the functions in CryptoAPI.
typedef unsigned int ALG_ID;
The following table lists the algorithm identifiers that are currently defined. Authors of custom cryptographic service providers (CSPs) can define new values. Also, the ALG_ID used by custom CSPs for the key specifications AT_KEYEXCHANGE and AT_SIGNATURE are provider dependent. Current mappings follow the table.
| Identifier | Value | Description |
|---|---|---|
| CALG_3DES | 0x00006603 | Triple DES encryption algorithm. |
| CALG_3DES_112 | 0x00006609 | Two-key triple DES encryption with effective key length equal to 112 bits. |
| CALG_AES | 0x00006611 | Advanced Encryption Standard (AES). This algorithm is supported by the Microsoft AES Cryptographic Provider. |
| CALG_AES_128 | 0x0000660e | 128 bit AES. This algorithm is supported by the Microsoft AES Cryptographic Provider. |
| CALG_AES_192 | 0x0000660f | 192 bit AES. This algorithm is supported by the Microsoft AES Cryptographic Provider. |
| CALG_AES_256 | 0x00006610 | 256 bit AES. This algorithm is supported by the Microsoft AES Cryptographic Provider. |
| CALG_AGREEDKEY_ANY | 0x0000aa03 | Temporary algorithm identifier for handles of Diffie-Hellman–agreed keys. |
| CALG_CYLINK_MEK | 0x0000660c | An algorithm to create a 40-bit DES key that has parity bits and zeroed key bits to make its key length 64 bits. This algorithm is supported by the Microsoft Base Cryptographic Provider. |
| CALG_DES | 0x00006601 | DES encryption algorithm. |
| CALG_DESX | 0x00006604 | DESX encryption algorithm. |
| CALG_DH_EPHEM | 0x0000aa02 | Diffie-Hellman ephemeral key exchange algorithm. |
| CALG_DH_SF | 0x0000aa01 | Diffie-Hellman store and forward key exchange algorithm. |
| CALG_DSS_SIGN | 0x00002200 | DSA public key signature algorithm. |
| CALG_ECDH | 0x0000aa05 | Elliptic curve Diffie-Hellman key exchange algorithm. Note: This algorithm is supported only through Cryptography API: Next Generation. Windows Server 2003 and Windows XP: This algorithm is not supported. |
| CALG_ECDH_EPHEM | 0x0000ae06 | Ephemeral elliptic curve Diffie-Hellman key exchange algorithm. Note: This algorithm is supported only through Cryptography API: Next Generation. Windows Server 2003 and Windows XP: This algorithm is not supported. |
| CALG_ECDSA | 0x00002203 | Elliptic curve digital signature algorithm. Note: This algorithm is supported only through Cryptography API: Next Generation. Windows Server 2003 and Windows XP: This algorithm is not supported. |
| CALG_ECMQV | 0x0000a001 | Elliptic curve Menezes, Qu, and Vanstone (MQV) key exchange algorithm. This algorithm is not supported. |
| CALG_HASH_REPLACE_OWF | 0x0000800b | One way function hashing algorithm. |
| CALG_HUGHES_MD5 | 0x0000a003 | Hughes MD5 hashing algorithm. |
| CALG_HMAC | 0x00008009 | HMAC keyed hash algorithm. This algorithm is supported by the Microsoft Base Cryptographic Provider. |
| CALG_KEA_KEYX | 0x0000aa04 | KEA key exchange algorithm (FORTEZZA). This algorithm is not supported. |
| CALG_MAC | 0x00008005 | MAC keyed hash algorithm. This algorithm is supported by the Microsoft Base Cryptographic Provider. |
| CALG_MD2 | 0x00008001 | MD2 hashing algorithm. This algorithm is supported by the Microsoft Base Cryptographic Provider. |
| CALG_MD4 | 0x00008002 | MD4 hashing algorithm. |
| CALG_MD5 | 0x00008003 | MD5 hashing algorithm. This algorithm is supported by the Microsoft Base Cryptographic Provider. |
| CALG_NO_SIGN | 0x00002000 | No signature algorithm. |
| CALG_OID_INFO_CNG_ONLY | 0xffffffff | The algorithm is only implemented in CNG. The macro, IS_SPECIAL_OID_INFO_ALGID, can be used to determine whether a cryptography algorithm is only supported by using the CNG functions. |
| CALG_OID_INFO_PARAMETERS | 0xfffffffe | The algorithm is defined in the encoded parameters. The algorithm is only supported by using CNG. The macro, IS_SPECIAL_OID_INFO_ALGID, can be used to determine whether a cryptography algorithm is only supported by using the CNG functions. |
| CALG_OID_INFO_PQ | 0xFFFFFFFD | Post-quantum cryptography algorithms. |
| CALG_OID_INFO_PQ_T | 0xFFFFFFFC | Post-quantum and traditional composite algorithms. |
| CALG_PCT1_MASTER | 0x00004c04 | Used by the Schannel.dll operations system. This ALG_ID should not be used by applications. |
| CALG_RC2 | 0x00006602 | RC2 block encryption algorithm. This algorithm is supported by the Microsoft Base Cryptographic Provider. |
| CALG_RC4 | 0x00006801 | RC4 stream encryption algorithm. This algorithm is supported by the Microsoft Base Cryptographic Provider. |
| CALG_RC5 | 0x0000660d | RC5 block encryption algorithm. |
| CALG_RSA_KEYX | 0x0000a400 | RSA public key exchange algorithm. This algorithm is supported by the Microsoft Base Cryptographic Provider. |
| CALG_RSA_SIGN | 0x00002400 | RSA public key signature algorithm. This algorithm is supported by the Microsoft Base Cryptographic Provider. |
| CALG_SCHANNEL_ENC_KEY | 0x00004c07 | Used by the Schannel.dll operations system. This ALG_ID should not be used by applications. |
| CALG_SCHANNEL_MAC_KEY | 0x00004c03 | Used by the Schannel.dll operations system. This ALG_ID should not be used by applications. |
| CALG_SCHANNEL_MASTER_HASH | 0x00004c02 | Used by the Schannel.dll operations system. This ALG_ID should not be used by applications. |
| CALG_SEAL | 0x00006802 | SEAL encryption algorithm. This algorithm is not supported. |
| CALG_SHA | 0x00008004 | SHA hashing algorithm. This algorithm is supported by the Microsoft Base Cryptographic Provider. |
| CALG_SHA1 | 0x00008004 | Same as CALG_SHA. This algorithm is supported by the Microsoft Base Cryptographic Provider. |
| CALG_SHA_256 | 0x0000800c | 256 bit SHA hashing algorithm. This algorithm is supported by Microsoft Enhanced RSA and AES Cryptographic Provider. Windows XP with SP3: This algorithm is supported by the Microsoft Enhanced RSA and AES Cryptographic Provider (Prototype). Windows XP with SP2, Windows XP with SP1 and Windows XP: This algorithm is not supported. |
| CALG_SHA_384 | 0x0000800d | 384 bit SHA hashing algorithm. This algorithm is supported by Microsoft Enhanced RSA and AES Cryptographic Provider.Windows XP with SP3: This algorithm is supported by the Microsoft Enhanced RSA and AES Cryptographic Provider (Prototype). Windows XP with SP2, Windows XP with SP1 and Windows XP: This algorithm is not supported. |
| CALG_SHA_512 | 0x0000800e | 512 bit SHA hashing algorithm. This algorithm is supported by Microsoft Enhanced RSA and AES Cryptographic Provider. Windows XP with SP3: This algorithm is supported by the Microsoft Enhanced RSA and AES Cryptographic Provider (Prototype). Windows XP with SP2, Windows XP with SP1 and Windows XP: This algorithm is not supported. |
| CALG_SKIPJACK | 0x0000660a | Skipjack block encryption algorithm (FORTEZZA). This algorithm is not supported. |
| CALG_SSL2_MASTER | 0x00004c05 | Used by the Schannel.dll operations system. This ALG_ID should not be used by applications. |
| CALG_SSL3_MASTER | 0x00004c01 | Used by the Schannel.dll operations system. This ALG_ID should not be used by applications. |
| CALG_SSL3_SHAMD5 | 0x00008008 | Used by the Schannel.dll operations system. This ALG_ID should not be used by applications. |
| CALG_TEK | 0x0000660b | TEK (FORTEZZA). This algorithm is not supported. |
| CALG_TLS1_MASTER | 0x00004c06 | Used by the Schannel.dll operations system. This ALG_ID should not be used by applications. |
| CALG_TLS1PRF | 0x0000800a | Used by the Schannel.dll operations system. This ALG_ID should not be used by applications. |
For the Microsoft Base Cryptographic Provider, the Microsoft Strong Cryptographic Provider, and the Microsoft Enhanced Cryptographic Provider, the ALG_IDs used for the key specifications AT_KEYEXCHANGE and AT_SIGNATURE are as follows:
- CALG_RSA_KEYX is used for AT_KEYEXCHANGE.
- CALG_RSA_SIGN is used for AT_SIGNATURE.
For the Microsoft Base DSS and Diffie-Hellman Cryptographic Provider, the ALG_IDs used for the key specifications AT_KEYEXCHANGE and AT_SIGNATURE are as follows:
- CALG_DH_SF is used for AT_KEYEXCHANGE.
- CALG_DSS_SIGN is used for AT_SIGNATURE.
| Requirement | Value |
|---|---|
| Minimum supported client | Windows XP [desktop apps only] |
| Minimum supported server | Windows Server 2003 [desktop apps only] |
| Header | Wincrypt.h |