RM0319 datasheet(303/368 Pages) STMICROELECTRONICS

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RM0319

Security co-processor (C3)

Doc ID 022640 Rev 3

303/368

28.4.2

DES channel

This Channel can compute DES and 3DES encryption and decryption in ECB and CBC

mode; executing C3 Flow type DES [START/APPEND] instruction.

Instruction set

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

DECRYPT instructions. Instructions that do not conform to the following bit encodings are

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

DES instructions

There are 2 different DES instructions:

●

DES START

●

DES 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.

DES START instruction

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

●

ECB

●

CBC

ECB

The DES 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.

AES_CNL

AES algorithm (ECB, CBC, CTR

modes)

Cryptography

0x00003000

UH_CNL

SHA-1/MD5 + HMAC algorithms Cryptography

0x00004002

EMPTY_CNL

No Channel

EMPTY_CNL

No Channel

EMPTY_CNL

No Channel

EMPTY_CNL

No Channel

Table 90.

Channel ID Table (continued)

Channel

No.

Channel Name

Function

Type

Channel ID

Table 91.

DES ECB start instruction bit encoding

Bit Encoding

xxxx01ab 000x xxxx cccc cccc cccc cccc

(32 bit Source Address for the key)

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