RM0319 datasheet(306/368 Pages) STMICROELECTRONICS

306 / 368 page

Security co-processor (C3)

RM0319

306/368

Doc ID 022640 Rev 3

28.4.3

AES channel

This channel computes AES encryption and decryption in ECB, CTR and CBC mode;

executing C3 Flow type instruction set.

Instruction set

The AES Channel executes AES [START/APPEND] ENCRYPT and AES [START/APPEND]

DECRYPT instructions specified in the C3v3 flow type instruction set v2.1 document

[ISv2.1]. Instructions that do not conform to the following bit encodings or to [ISv2.1] are

unknown to the AES Channel that will go in error state.

AES instructions

There are 2 different AES instructions:

●

AES START

●

AES APPEND

The first instruction is used for setting the operation parameters, such as the key and the

initialization vector. The second one is used for passing the data to encrypt or decrypt.

AES START instruction

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

●

ECB

●

CBC

●

CTR

ECB

The AES START ECB instruction is 2 words long. This instruction is used to set the key 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:

Bits 15 to 0 in the first instruction word (cccc in Table 96.) represent the length in Bytes of

the key.

Table 97.

AES ECB START instruction bit encoding

Bit Encoding

xxxx 01xa 000x xxxx cccc cccc cccc cccc

32 bit Source Address for the key

Table 98.

AES ECB Bit ‘a’ encoding

Bit #24 - a

Operation

0DES

13DES

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