參數(shù)資料
型號(hào)： MP80C51C-36D
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 36 MHz, MICROCONTROLLER, PDIP40
封裝： PLASTIC, DIP-40
文件頁數(shù)： 85/143頁
文件大?。?/td> 4602K
代理商： MP80C51C-36D
46
XMEGA A3BU [DATASHEET]
8362F–AVR–02/2013
27.
AES and DES Crypto Engine
27.1
Features
Data Encryption Standard (DES) CPU instruction
Advanced Encryption Standard (AES) crypto module
DES Instruction
Encryption and decryption
DES supported
Encryption/decryption in 16 CPU clock cycles per 8-byte block
AES crypto module
Encryption and decryption
Supports 128-bit keys
Supports XOR data load mode to the state memory
Encryption/decryption in 375 clock cycles per 16-byte block
27.2
Overview
The Advanced Encryption Standard (AES) and Data Encryption Standard (DES) are two commonly used standards for
cryptography. These are supported through an AES peripheral module and a DES CPU instruction, and the
communication interfaces and the CPU can use these for fast, encrypted communication and secure data storage.
DES is supported by an instruction in the AVR CPU. The 8-byte key and 8-byte data blocks must be loaded into the
register file, and then the DES instruction must be executed 16 times to encrypt/decrypt the data block.
The AES crypto module encrypts and decrypts 128-bit data blocks with the use of a 128-bit key. The key and data must
be loaded into the key and state memory in the module before encryption/decryption is started. It takes 375 peripheral
clock cycles before the encryption/decryption is done. The encrypted/encrypted data can then be read out, and an
optional interrupt can be generated. The AES crypto module also has DMA support with transfer triggers when
encryption/decryption is done and optional auto-start of encryption/decryption when the state memory is fully loaded.
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