SWRA667 January   2020 CC1312PSIP , CC1312R , CC1314R10 , CC1352P , CC1352P7 , CC1352R , CC2642R , CC2642R-Q1 , CC2652P , CC2652R , CC2652R7 , CC2652RB , CC2652RSIP

 

  1.   Cryptographic Performance and Energy Efficiency on SimpleLink™ CC13x2/CC26x2 Wireless MCUs
    1.     Trademarks
    2. 1 Abbreviations and Acronyms
    3. 2 Introduction
    4. 3 Benefits of Cryptographic Acceleration in Embedded Security Solutions
    5. 4 TI Drivers for SimpleLink MCUs
      1. 4.1 Power Management Overview
      2. 4.2 Return Behavior
        1. 4.2.1 Runtime Overhead
      3. 4.3 Efficient Power Management
    6. 5 CC13x2/CC26x2 Crypto Peripherals
      1. 5.1 AES and Hash Crypto Accelerator
      2. 5.2 Public Key Accelerator
        1. 5.2.1 ECDH Power Management Driver Example
      3. 5.3 TRNG
    7. 6 Benchmarks
      1. 6.1 AES and Hash Crypto Accelerator Based Drivers
        1. 6.1.1 AES CBC
        2. 6.1.2 AES CCM
        3. 6.1.3 AES GCM
        4. 6.1.4 AES CTR DRBG
        5. 6.1.5 SHA-224
        6. 6.1.6 SHA-256
        7. 6.1.7 SHA-384
        8. 6.1.8 SHA-512
      2. 6.2 PKA Engine Based Drivers
        1. 6.2.1 ECDH
        2. 6.2.2 ECDSA
        3. 6.2.3 ECJPAKE
      3. 6.3 TRNG Based Drivers
        1. 6.3.1 TRNG
    8. 7 Conclusion
    9. 8 References
    10.     Appendix: Plots of Blocking vs Polling Performance

6.1.3 AES GCM

The AES GCM (see Reference [8]) benchmark consists of encrypting and authenticating messages of varying sizes and authenticating additional authenticated data (AAD) of a constant size. The duration of an AES GCM operation is governed by the key size, input length, and AAD length. We used a key length of 128 bits, a fixed AAD length of 32 bytes, and input lengths of 64, 8k, and 16k bytes. We chose a constant AAD length because the AAD usually contains metadata that does not scale in length with the message length.

Table 8. AES GCM Benchmark Results

Payload Length (bytes) Duration HW (ms) Duration SW mbed TLS (ms) Duration Improvement Average Current HW (mA) Average Current SW mbed TLS (mA) Energy Efficiency Improvement
64 0.036 0.533 14.8 3.94 3.10 11.6
8000 0.646 36.8 56.9 2.00 3.10 88.2
16000 1.174 73.3 62.4 1.94 3.10 99.8