RM0319 datasheet(309/368 Pages) STMICROELECTRONICS

309 / 368 page

RM0319

Security co-processor (C3)

Doc ID 022640 Rev 3

309/368

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 101). Bits 15 to 0 in the first instruction word (cccc in Table

103.) represent the length in Bytes of the key.

28.4.4

Unified hash with HMAC channel

Unified HASH channel can compute MD5 and SHA-1 digests of a message, executing C3

Flow type instruction set's HASH [MD5/SHA1] instruction.

It can compute the HMAC of a message with MD5 and SHA-1, executing C3 Flow type

instruction set's HMAC [MD5/SHA1] instruction.

It can save and restore the internal context in order to allow the stop and the resume of the

computation, executing C3 Flow type instruction set's HASH [CONTEXT] and HMAC

[CONTEXT] instructions.

Instruction set

The UH Channel executes HASH [MD5/SHA1/CONTEXT] and HMAC

[MD5/SHA1/CONTEXT] instructions specified in the C3v3 flow type instruction set.

Instructions that do not conform to the following bit encodings are unknown to the UH

Channel that will go in error state.

HASH instruction

There are 3 different HASH instructions:

●

HASH MD5

●

HASH SHA1

●

HASH CONTEXT

The first 2 instructions are used for computing the digest of a message and work in the

same way. The last one is used for saving and restoring the context.

HASH [MD5/SHA1] instructions

Each HASH [MD5/SHA1] instruction is composed of 3 sub-instructions:

●

INIT

●

APPEND

●

END

INIT

The HASH [MD5/SHA1] INIT instruction is 1 word long. This instruction is used to set the

Function.

32 bit Source Address for the data

32 bit Destination Address for the data

Table 103.

AES CTR APPEND instruction bit encoding (continued)

Bit Encoding

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