RSA Security manual AIMD5WithXORBER

AI_MD5WithXOR_BER

AI_MD5WithXOR_BER

Purpose:

This AI is similar to AI_MD5WithXOR except that it uses the ASN.1 BER format. This AI allows you to parse and create ASN.1 algorithm identifiers such as used in PKCS #7 and other protocols. You call B_SetAlgorithmInfo to initialize an algorithm object from the encoded algorithm identifier which includes ASN.1 encoding of the B_PBE_PARAMS structure defined in the description of AI_MD5WithXOR. You call B_GetAlgorithmInfo with this AI to create an encoded algorithm identifier from an algorithm object that was created using AI_MD5WithXOR or AI_MD5WithXOR_BER. The OID for this algorithm, excluding the tag and length bytes, in decimal is “42, 134, 72, 134, 247, 13, 1, 5, 9”.

Type of information this allows you to use:

the encoding of an algorithm identifier that specifies the MD5 With “exclusive or” (XOR) password-based encryption algorithm, as defined by RSA Security Inc.

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 XOR.

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_EncryptInit, B_EncryptUpdate, B_EncryptFinal, B_DecryptInit,

B_DecryptUpdate, and B_DecryptFinal. You may pass (B_ALGORITHM_OBJ)NULL_PTR for all randomAlgorithm arguments.

Algorithm methods to include in application’s algorithm chooser:

AM_MD5 and AM_MD5_RANDOM.

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