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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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RM0319 датащи(PDF) 311 Page - STMicroelectronics |
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RM0319 датащи(HTML) 311 Page - STMicroelectronics |
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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 t Truncate 1’b0 Full digest 1’b1 Truncated 96 bit digest Table 108. HASH CONTEXT SAVE Instruction bit encoding W# Bit Encoding 1 xxxx 0101 10xx xxxx cccc cccc cccc cccc 2 32 bit Destination Address for the context Table 109. HASH CONTEXT RESTORE Instruction bit encoding W# Bit Encoding 1 xxxx 0101 11xx xxxx cccc cccc cccc cccc 2 32 bit Source Address for the context |
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