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AI_SHA1_BER
AI_SHA1_BER
Purpose:
This AI is similar to AI_SHA1 except that it uses the ASN.1 BER format. This AI allows you to parse and create ASN.1 algorithm identifiers such as those used in PKCS #7 and other protocols. You call B_SetAlgorithmInfo to initialize an algorithm object from the encoded algorithm identifier. You call B_GetAlgorithmInfo with this AI to create an encoded algorithm identifier from an algorithm object that was created using AI_SHA1 or AI_SHA1_BER. The OID for this algorithm, excluding the tag and length bytes, in decimal is “43, 14, 3, 2, 26”.
Type of information this allows you to use:
the encoding of an algorithm identifier that specifies the SHA1 message digest algorithm as defined in FIPS PUB
Format of info supplied to B_SetAlgorithmInfo:
pointer to an ITEM structure that gives the address and length of the
Format of info returned by B_GetAlgorithmInfo:
pointer to an ITEM structure that gives the address and length of the
Crypto-C procedures to use with algorithm object:
B_DigestInit, B_DigestUpdate, and B_DigestFinal. Supply NULL_PTR for the keyObject argument in B_DigestInit.
Algorithm methods to include in application’s algorithm chooser:
AM_SHA.
C h a p t e r 2 A l g o r i t h m I n f o Ty p e s | 225 |