atxmega192a1-cu ATMEL Corporation, atxmega192a1-cu Datasheet - Page 34

• Manufacturer Part Number: atxmega192a1-cu
• Description: Atxmega64a1 8/16 Bit Microcontroller With 64/128/192/256k Bytes In-system Programmable Flash
• Manufacturer: ATMEL Corporation

22. Crypto Engine
22.1
22.2
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Features
Overview
ATxmega A1
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The Advanced Encryption Standard (AES) and Data Encryption Standard (DES) are two com-
monly used standards for encryption. These are supported through an AES peripheral module
and a DES core instruction.
DES is supported by a DES instruction in the AVR XMEGA CPU. The 8-byte key and 8-byte
data blocks must be loaded into the Register file, and then DES 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 module before encryption/decryption is started. It
takes 375 peripheral clock cycles before encrypted/decrypted data can be read out.
Data Encryption Standard (DES) CPU instruction
Advanced Encryption Standard (AES) crypto module
DES Instruction
AES Crypto Module
– Encryption and Decryption
– DES and triple-DES supported
– Single-cycle DES instruction
– Encryption/Decryption in 16 clock cycles per 8-byte block
– Encryption and Decryption
– Support 128-bit keys
– Support XOR data load mode to the State memory
– Encryption/Decryption in 375 clock cycles per 16-byte block
8067A–AVR–02/08