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ATSHA204 Datasheet(PDF) 49 Page - ATMEL Corporation |
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ATSHA204 Datasheet(HTML) 49 Page - ATMEL Corporation |
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49 / 65 page  Atmel ATSHA204 [DATASHEET] 49 8740D −CRYPTO−3/12 Upon completion of the command, TempKey.SourceFlag is set to “Rand.” If Mode[0:1] is three, this command operates in pass-through mode, the input parameter (NumIn) must be 32 bytes long, and TempKey is loaded with NumIn. No SHA-256 calculation is performed, no data is returned to the system, and TempKey.SourceFlag is set to “Input.” If Mode[0:1] is one, the automatic seed update is suppressed. See Section 3.4.2 for more details. Table 8-27. Mode Encoding Bits Meaning 2-7 Must be zero. 0-1 0: Combine new random number with NumIn, store in TempKey. Automatically update EEPROM seed only if necessary prior to random number generation. Recommended for highest security. 1: Combine new random number with NumIn, store in TempKey. Generate random number using existing EEPROM seed, do NOT update EEPROM seed. 2: Invalid 3: Operate in pass-through mode and write TempKey with NumIn. |
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