Chapter 2 Algorithm Info Types 31
AI_DES_EDE3_CBC_IV8
AI_DES_EDE3_CBC_IV8
Purpose:
This AI allows you to perform three-key DES in encrypt-decrypt-encrypt mode as
defined in ANSI X9.17 using the outer-CBC mode. This AI is initialized with an 8-byte
IV and operates on data that is an exact multiple of 8 bytes long. No padding will be
performed. See
AI_DES_EDE3_CBCPadIV8 for the same algorithm type with padding.
Type of information this allows you to use:
an 8-byte initialization vector for the DES-EDE3-CBC encryption algorithm.
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_DES_EDE3_CBC_ENCRYPT for encryption and AM_DES_EDE3_CBC_DECRYPT for
decryption.
Key info types for keyObjec t in B_EncryptInit or B_DecryptInit:
KI_DES24Strong, KI_24Byte, or KI_Item (if the length of the ITEM is 24).
Input constraints:
During encryption, this algorithm does not pad the output. Thus, you must provide
