RM0319 datasheet(311/368 Pages) STMICROELECTRONICS

311 / 368 page

RM0319

Security co-processor (C3)

Doc ID 022640 Rev 3

311/368

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 105.).

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

HASH CONTEXT instruction

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

●

SAVE

●

RESTORE

SAVE

The HASH 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.

RESTORE

The HASH CONTEXT RESTORE instruction is 2 words long. This instruction is used to set

the Source Address Register for the context and to restore the full context.

The second word represents the Source Address for the context.

HMAC instruction

There are 3 different HMAC instructions:

●

HMAC MD5

●

HMAC SHA1

●

HMAC CONTEXT

Bit 20

Truncate

1’b0

Full digest

1’b1

Truncated 96 bit digest

Table 108.

HASH CONTEXT SAVE Instruction bit encoding

Bit Encoding

xxxx 0101 10xx xxxx cccc cccc cccc cccc

32 bit Destination Address for the context

Table 109.

HASH CONTEXT RESTORE Instruction bit encoding

Bit Encoding

xxxx 0101 11xx xxxx cccc cccc cccc cccc

32 bit Source Address for the context

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