RM0319 datasheet(307/368 Pages) STMICROELECTRONICS

307 / 368 page

RM0319

Security co-processor (C3)

Doc ID 022640 Rev 3

307/368

CBC

The AES 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.

Bit ‘a’ in the above table is used to set the operation to perform and has the same encoding

as in the ECB instruction (Table 97). Bits 15 to 0 in the first instruction word (cccc in

Table 99) represent the length in Bytes of the key.

CTR

The AES START CTR 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, while the second word represents the Source Address for the key.

Bit ‘a’ in the above table is used to set the operation to perform and has the same encoding

as in the ECB instruction (Table 98). Bits 15 to 0 in the first instruction word (cccc in

Table 100) represent the length in Bytes of the key.

AES APPEND instruction

The AES APPEND instruction can be applied with 3 different modes of operation:

●

ECB

●

CBC

●

CTR

ECB

The AES 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

instruction word, the second word represents the Source Address and the third word

represents the Destination Address.

Table 99.

AES CBC START instruction bit encoding

Bit Encoding

xxxx 10xa 001x xxxx cccc cccc cccc cccc

32 bit Source Address for the key

32 bit Source Address for the IV

Table 100.

AES CTR START instruction bit encoding

Bit Encoding

xxxx 10xa 010x xxxx cccc cccc cccc cccc

32 bit Source Address for the key

32 bit Source Address for the IV

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