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AI_MD5WithRSAEncryptionBER
134 RSA BSAFE Crypto-C Library Reference Manual
AI_MD5WithRSAEncryptionBER
Purpose:
This AI is similar to AI_MD5WithRSAEncryption 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_MD5WithRSAEncryption or
AI_MD5WithRSAEncryptionBER. The OID for this algorithm, excluding the tag and
length bytes, in decimal is “
42, 134, 72, 134, 247, 13, 1, 1, 4”.
Type of information this allows you to use:
the encoding of an algorithm identifier that specifies the MD5 With RSA signature
algorithm that uses the MD5 digest algorithm and the RSA algorithm to create and
verify RSA digital signatures as defined in PKCS #1.
Note that in order to perform PKCS #1 digital signatures with a 16-byte digest, the
RSA key must be at least 360 bits long.
Format of info supplied to B_SetAlgorithmInfo:
pointer to an ITEM structure that gives the address and length of the BER-encoded
algorithm identifier. The encoding is converted to DER before it is copied to the
algorithm object.
B_SetAlgorithmInfo returns BE_WRONG_ALGORITHM_INFO if the
algorithm identifier specifies an algorithm other than MD5 With RSA Encryption.
Format of info returned by B_GetAlgorithmInfo:
pointer to an ITEM structure that gives the address and length of the DER-encoded
algorithm identifier.
Crypto-C procedures to use with algorithm object:
B_SignInit, B_SignUpdate, B_SignFinal, B_VerifyInit, B_VerifyUpdate, and
B_VerifyFinal. You may pass (B_ALGORITHM_OBJ)NULL_PTR for all
randomAlgorithm
arguments.