
Symmetric Key Hardware Accelerator (SKHA)
Freescale Semiconductor
35-3
encryption. The processor supplies data to the module that is processed as 128-bit input. The SKHA engine
performs ten rounds for encryption or decryption. AES operates in ECB, CBC, and CTR modes.
Figure 35-3. AES Encryption Process
35.1.1.3
Electronic Code Book (ECB) Cipher Mode
The simplest mode is ECB. Each block is processed independently, as shown in
context used in this mode. Each block of plaintext is encrypted to determine the corresponding ciphertext.
In decrypt mode, the ciphertext blocks are decrypted to restore the plaintext.
Figure 35-4. ECB Mode Processing
35.1.1.4
Cipher Block Chaining (CBC) Cipher Mode
Cipher Block Chaining mode encrypts the output of the previous block with the current block input as
shown in
. For decryption, the previous ciphertext block is mixed with the decrypted block as
shown in
. A 128-bit random initialization vector (IV) must be loaded prior to processing a
message. The context registers are updated internally and must be read and restored during a context
switch.
...
AES
128-bit key
128-bit
block 1
128-bit
block 2
128-bit
block n-1
128-bit
block n
...
128-bit
block 1
128-bit
block 2
128-bit
block n-1
128-bit
block n
Plaintext blocks
Ciphertext blocks
Encrypt(k)
Plain 1
Cipher 1
Encrypt(k)
Plain 2
Cipher 2
Encrypt(k)
Plain 3
Cipher 3
Encrypt(k)
Plain N
Cipher N
Decrypt(k)
Plain 1
Decrypt(k)
Plain 2
Decrypt(k)
Plain 3
Decrypt(k)
Plain N
MCF5329 Reference Manual, Rev 3
Содержание MCF5329
Страница 106: ...ColdFire Core 3 32 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 126: ...Enhanced Multiply Accumulate Unit EMAC 4 20 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 148: ...Cache 5 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 154: ...Static RAM SRAM 6 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 184: ...Power Management 8 18 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 204: ...Reset Controller Module 10 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 220: ...System Control Module SCM 11 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 228: ...Crossbar Switch XBS 12 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 268: ...General Purpose I O Module 13 40 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 392: ...SDRAM Controller SDRAMC 18 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 436: ...Fast Ethernet Controller FEC 19 44 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 564: ...Liquid Crystal Display Controller LCDC 22 44 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 594: ...FlexCAN 23 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 678: ...Pulse Width Modulation PWM Module 26 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 684: ...Watchdog Timer Module 27 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 692: ...Programmable Interrupt Timers PIT0 PIT3 28 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 704: ...DMA Timers DTIM0 DTIM3 29 12 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 720: ...Queued Serial Peripheral Interface QSPI 30 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 754: ...UART Modules 31 34 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 770: ...I2 C Interface 32 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 790: ...Message Digest Hardware Accelerator MDHA 33 20 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 866: ...Debug Module 36 50 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 902: ...Register Memory Map Quick Reference A 26 Freescale Semiconductor MCF5329 Reference Manual Rev 3...