RM0319 datasheet(310/368 Pages) STMICROELECTRONICS

310 / 368 page

Security co-processor (C3)

RM0319

310/368

Doc ID 022640 Rev 3

Bits ‘aa’ in the above table are used to set the algorithm to use:

Table 105.

HASH INIT Bit ‘aa’ encoding

APPEND

The HASH [MD5/SHA1] APPEND instruction is 2 words long. This instruction is used to set

the Source Address Register for the message and to start the computation of the digest.

The length of the message is encoded in the first instruction word, while the second word

represents the Source Address for the message.

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

106.) represent the Count in Bytes of the input message.

END

The HASH [MD5/SHA1] END instruction is 2 words long. This instruction is used to set the

Destination Address Register for the message and to end the computation of the digest.

The second word represents the Destination Address for the digest.

Table 104.

HASH INIT Instruction bit encoding

Bit Encoding

xxxx 000a a00x xxxx cccc cccc cccc cccc

Bit 24 to 23

Algorithm

2’b00

MD5

2’b01

SHA-1

2’b10

Not Used

2’b11

Context (See CONTEXT instruction)

Table 106.

HASH APPEND Instruction bit encoding

Bit Encoding

xxxx 010a a01x xxxx cccc cccc cccc cccc

32 bit Source Address for the message

Table 107.

HASH END Instruction bit encoding

Bit Encoding

xxxx 010a a01t xxxx cccc cccc cccc cccc

32 bit Destination Address for the message

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