RSA Security 5 manual AIMD2WithRC2CBCPadBER

AI_MD2WithRC2_CBCPadBER

AI_MD2WithRC2_CBCPadBER

Purpose:

This AI is similar to AI_MD2WithRC2_CBCPad 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 that includes the effective key size, salt and iteration count. You call B_GetAlgorithmInfo with this AI to create an encoded algorithm identifier from an algorithm object that was created using AI_MD2WithRC2_CBCPad or AI_MD2WithRC2_CBCPadBER. The OID for this algorithm, excluding the tag and length bytes, in decimal, is “42, 134, 72, 134, 247, 13, 1, 5, 4”. Also see AI_MD2WithRC2_CBCPad.

Type of information this allows you to use:

the encoding of an algorithm identifier that specifies the MD2 With RC2-CBC 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 MD2 With RC2-CBC.

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_MD2 and AM_RC2_CBC_ENCRYPT for encryption or AM_RC2_CBC_DECRYPT for

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 111