AI_RC5_CBCPadBER
200 RSA BSAFE Crypto-C Library Reference Manual
AI_RC5_CBCPadBER
Purpose:
This AI is similar to AI_RC5_CBCPad 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, which includes ASN.1 encoding of the
A_RC5_CBC_PARAMS structure defined in the description of AI_RC5_CBCPad. You call
B_GetAlgorithmInfo with this AI to create an encoded algorithm identifier from an
algorithm object that was created using AI_RC5_CBCPad, AI_RC5_CBCPadBER or
AI_RC5_CBCPadPEM. The OID for this algorithm, excluding the tag and length bytes, in
decimal is “42, 134, 72, 134, 247, 13, 3, 9”.
Type of information this allows you to use:
the encoding of an algorithm identifier that specifies the RC5 32/r/b CBC encryption
algorithm.
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 RC5-CBC With Padding.
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_RC5_CBC_ENCRYPT for encryption and AM_RC5_CBC_DECRYPT for decryption.