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Freescale Semiconductor
35-1
Chapter 35
Symmetric Key Hardware Accelerator (SKHA)
35.1
Introduction
The symmetric key hardware accelerator (SKHA) is a cryptographic hardware coprocessor designed to
implement two widely used symmetric key block cipher algorithms, AES (Advanced Encryption
Standard) and DES (Data Encryption Standard).
NOTE
The MCF5327, MCF53281, and MCF5328 do not contain cryptography
modules. Refer to
for details on device configurations.
35.1.1
Features
The SKHA supports the following block ciphers:
•
AES
— 128-bit key
— Electronic Code Book (ECB), Cipher Block Chaining (CBC), Counter (CTR) cipher modes.
•
DES
— 64 bit key (with parity)
— ECB, CBC, and CTR modes
•
Triple-DES (3DES)
— 2 key & 3 key (128-bits & 192-bits with parity)
— Key parity check
— ECB, CBC, and CTR modes
35.1.1.1
Data Ecryption Standard (DES & 3DES) Algorithm
The SKHA is able to perform bulk data encryption/decryption in compliance with the Data Encryption
Standard algorithm (ANSI x3.92, FIPS 46-2), as well as 3DES, which is an extension of the DES
algorithm.
In DES mode, the SKHA operates by permuting 64-bit data blocks with a shared key and an initialization
vector (IV). The SKHA supports two modes of IV operation: Electronic Code Book (ECB) and Cipher
Block Chaining (CBC).
The processor supplies data to the SKHA, and the data is encrypted and subsequently made available to
the processor via an output FIFO. The session key is input to the block prior to encryption.
MCF5329 Reference Manual, Rev 3
Summary of Contents for MCF5329
Page 106: ...ColdFire Core 3 32 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 148: ...Cache 5 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 154: ...Static RAM SRAM 6 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 184: ...Power Management 8 18 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 204: ...Reset Controller Module 10 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 220: ...System Control Module SCM 11 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 228: ...Crossbar Switch XBS 12 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 268: ...General Purpose I O Module 13 40 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 392: ...SDRAM Controller SDRAMC 18 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 436: ...Fast Ethernet Controller FEC 19 44 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 594: ...FlexCAN 23 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 678: ...Pulse Width Modulation PWM Module 26 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 684: ...Watchdog Timer Module 27 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 704: ...DMA Timers DTIM0 DTIM3 29 12 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 754: ...UART Modules 31 34 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 770: ...I2 C Interface 32 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 866: ...Debug Module 36 50 Freescale Semiconductor MCF5329 Reference Manual Rev 3...