RM0319 datasheet(313/368 Pages) STMICROELECTRONICS

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RM0319

Security co-processor (C3)

Doc ID 022640 Rev 3

313/368

END

The HMAC [MD5/SHA1] END instruction is 3 words long. This instruction is used to set the

Source Address Register for the HMAC key and the Destination Address Register for the

HMAC and to end the computation of the HMAC.

The second word represents the Source Address for the key, while the third word represents

the Destination Address for the HMAC.

Bits ‘aa’ in the above table are used to set the algorithm to use and have the same encoding

as in the INIT instruction (Table 110.).

Bits 15 to 0 in the first instruction word (cccc in Table 112.) represent the length in Bytes of

the key.

Bit ‘t’ in the above table is used to truncate the result to 96 bits.

HMAC CONTEXT instruction

The HMAC CONTEXT instruction is composed by 2 sub-instructions:

●

SAVE

●

RESTORE

SAVE

The HMAC CONTEXT SAVE instruction is 2 words long. This instruction is used to set the

Destination Address Register for the context and to save the full context.

The second word represents the Destination Address for the context.

Table 112.

HMAC END Instruction bit encoding

Bit Encoding

xxxx 101a a10tx xxxx cccc cccc cccc cccc

32 bit Source Address for the key

32 bit Destination Address for the message

Bit 20

Truncate

1’b0

Full HMAC

1’b1

Truncated 96 bit HMAC

Table 113.

HMAC CONTEXT SAVE Instruction bit encoding

Bit Encoding

xxxx 0111 10xx xxxx cccc cccc cccc cccc

32 bit Destination Address for the context

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