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  • Kinetis CAU

    Encryption library hardware acceleration
    Kinetis CAU

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

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    SEGGER emSSH

    The SEGGER encryption 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

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