RM0319 datasheet(304/368 Pages) STMICROELECTRONICS

304 / 368 page

Security co-processor (C3)

RM0319

304/368

Doc ID 022640 Rev 3

Bit ‘a’ in the above table is used to set the algorithm to use:

Bit ‘b’ in the above table is used to set the operation to perform:

Bits 15 to 0 in the first instruction word (cccc in the above table) represent the length in

Bytes of the key.

CBC

The DES START CBC instruction is 3 words long. This instruction is used to set the key and

the initialization vector for the following operations. The length of the key is encoded in the

first instruction word, the second word represents the Source Address for the key and the

third word represents the Source Address for the Initialization Vector.

Bits ‘a’ and ‘b’ in the above table are used to set the algorithm and the operation to perform

and have the same encoding as in the ECB instruction. Bits 15 to 0 in the first instruction

word (cccc in the above table) represent the length in Bytes of the key.

DES APPEND instruction

The DES APPEND instruction can be applied with 2 different modes of operation:

●

ECB

●

CBC

ECB

The DES APPEND ECB instruction is 3 words long. This instruction is used for passing the

data to process (encrypt or decrypt). The length of the data to process is encoded in the first

Table 92.

DES ECB bit ‘a’ encoding

Bit 25

Operation

0DES

13DES

Table 93.

DES ECB bit ‘b’ encoding

Bit 24

Operation

0Encryption

Decryption

Table 94.

DES CBC START Instruction Bit Encoding

Bit Encoding

xxxx 10ab 001x xxxx cccc cccc cccc cccc

32 bit Source Address for the key

32 bit Source Address for the IV

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