Chapter 2 Algorithm Info Types 43
AI_DESX_CBCPadIV8
AI_DESX_CBCPadIV8
Purpose:
This AI allows you to perform DESX encryption or decryption in CBC mode. It is
initialized with an 8-byte IV and operates on data that is any byte length. The padding
mode is PKCS #5, which makes the ciphertext 1 to 8 bytes longer than the plaintext.
See
AI_DESX_CBC_IV8 for the same algorithm type with no padding. See
AI_DESX_CBCPadBER for the same algorithm type with BER encoding.
Type of information this allows you to use:
an 8-byte initialization vector for the DESX-CBC encryption algorithm, as defined by
RSA Security Inc., with padding scheme defined in PKCS #5.
Format of info supplied to B_SetAlgorithmInfo:
pointer to an unsigned char array that holds the 8 bytes of the initialization vector.
Format of info returned by B_GetAlgorithmInfo:
pointer to an unsigned char array that holds the 8 bytes of the initialization vector.
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_DESX_CBC_ENCRYPT for encryption and AM_DESX_CBC_DECRYPT for decryption.
Key info types for keyObjec t in B_EncryptInit or B_DecryptInit:
KI_DES24Strong, KI_24Byte, KI_Item (if the length of the ITEM is 24), KI_DESX, or
KI_DESX_BSAFE1.
