Filter
Top Products
AI_RC4_BER
190 RSA BSAFE Crypto-C Library Reference Manual
AI_RC4_BER
Purpose:
This AI is similar to AI_RC4 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_RC4 or AI_RC4_BER. The OID for this algorithm, excluding the tag and length
bytes, in decimal is “
42, 134, 72, 134, 247, 13, 3, 4”.
Type of information this allows you to use:
the encoding of an algorithm identifier that specifies the RC4 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 RC4.
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.
Due to the nature of the RC4 algorithm, security is compromised if multiple data
blocks are encrypted with the same RC4 key. Therefore,
B_EncryptUpdate cannot be
called after
B_EncryptFinal. To begin an encryption operation for a new data block,
you must call
B_EncryptInit and supply a new key.