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Crypto Library Hardware Acceleration: Kinetis CAU

The Kinetis Cryptographic Acceleration Unit (CAU) is a primitive accelerator presented as a memory-mapped peripheral.

The SEGGER crypto library has specialized hardware-assisted ciphering and hashing support

The following cryptographic algorithms using the CAU:

  • DES in ECB and CBC modes.
  • TDES in ECB and CBC modes with keying options 1, 2, and 3.
  • AES-128, AES-192, and AES-256 in ECB and CBC modes.
  • MD5
  • SHA-1
  • SHA-256
  • RNG

All other cipher modes (e.g. AES-GCM and AES-CCM) use hardware-assisted ciphering of individual blocks with software taking care of the cipher mode.

CipherModeSoftware PerformanceHardware PerformanceSpeedup
AES-128-ECBEncrypt2.17 MB/s8.20 MB/sx3.8

AES-192-ECBEncrypt1.86 MB/s6.87 MB/sx3.7
AES-256-ECBEncrypt1.62 MB/s6.09 MB/sx3.8
AES-128-CBCEncrypt1.72 MB/s7.91 MB/sx4.6
AES-192-CBCEncrypt1.52 MB/s6.56 MB/sx4.3
AES-256-CBCEncrypt1.36 MB/s5.85 MB/sx4.3
AES-128-CBCDecrypt1.61 MB/s6.67 MB/sx4.2
AES-192-CBCDecrypt1.43 MB/s5.77 MB/sx4.0
AES-256-CBCDecrypt1.29 MB/s5.08 MB/sx3.9
CipherModeSoftware PerformanceHardware PerformanceSpeedup
DES-ECBEncrypt1.05 MB/s11.74 MB/sx11.2

DES-EDE2-ECBEncrypt0.36 MB/s11.74 MB/sx32.6

DES-EDE3-ECBEncrypt0.36 MB/s11.74 MB/sx32.6

DES-CBCEncrypt0.90 MB/s11.84 MB/sx13.1

DES-EDE2-CBCEncrypt0.34 MB/s11.85 MB/sx34.7

DES-EDE3-CBCEncrypt0.34 MB/s11.85 MB/sx34.7

DES-CBCDecrypt0.84 MB/s9.48 MB/sx11.3

DES-EDE2-CBCDecrypt0.33 MB/s9.48 MB/sx28.7

DES-EDE3-CBCDecrypt0.33 MB/s9.48 MB/sx28.7

More Information

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