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RM0319 数据表(PDF) 303 Page - STMicroelectronics |
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RM0319 数据表(HTML) 303 Page - STMicroelectronics |
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303 / 368 page  RM0319 Security co-processor (C3) Doc ID 022640 Rev 3 303/368 28.4.2 DES channel This Channel can compute DES and 3DES encryption and decryption in ECB and CBC mode; executing C3 Flow type DES [START/APPEND] instruction. Instruction set The DES Channel executes DES [START/APPEND] ENCRYPT and DES [START/APPEND] DECRYPT instructions. Instructions that do not conform to the following bit encodings are unknown to the DES Channel that will go in error state. DES instructions There are 2 different DES instructions: ● DES START ● DES APPEND The first instruction is used for setting the operation parameters, such as the key and the initialization vector. The second one is used for passing the data to encrypt or decrypt. DES START instruction The DES START instruction can be applied with 2 different modes of operation: ● ECB ● CBC ECB The DES START ECB instruction is 2 words long. This instruction is used to set the key for the following operations. The length of the key is encoded in the first instruction word, while the second word represents the Source Address for the key. 2 AES_CNL AES algorithm (ECB, CBC, CTR modes) Cryptography 0x00003000 3 UH_CNL SHA-1/MD5 + HMAC algorithms Cryptography 0x00004002 4 EMPTY_CNL No Channel - - 5 EMPTY_CNL No Channel - - 6 EMPTY_CNL No Channel - - 7 EMPTY_CNL No Channel - - Table 90. Channel ID Table (continued) Channel No. Channel Name Function Type Channel ID Table 91. DES ECB start instruction bit encoding W# Bit Encoding 1 xxxx01ab 000x xxxx cccc cccc cccc cccc 2 (32 bit Source Address for the key) |
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