ALG_ID
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  Twokey 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 DiffieHellman–agreed keys. 
CALG_CYLINK_MEK  0x0000660c  An algorithm to create a 40bit 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  DiffieHellman ephemeral key exchange algorithm. 
CALG_DH_SF  0x0000aa01  DiffieHellman store and forward key exchange algorithm. 
CALG_DSS_SIGN  0x00002200  DSA public key signature algorithm. 
CALG_ECDH  0x0000aa05  Elliptic curve DiffieHellman 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 DiffieHellman 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_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 DiffieHellman 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.
Requirements
Minimum supported client 
Windows XP [desktop apps only] 

Minimum supported server 
Windows Server 2003 [desktop apps only] 
Header 

See also