wolfSSL TriCore HSM Support

The Infineon Tricore TC2xx and the new TC3xx series chips are popular chips among safety and security critical applications. As the name implies, these chips come with multiple CPU cores to meet the demands of real time computing, however some variants come with a built in HSM core that is an ARM Cortex M3 operating at a frequency of 100MHz, 96KB RAM, MPU and offers a few useful secure applications.

1. Secure boot
2. Shared memory bridge module with “Firewall” functionality
3. Debug support with authentication
4. Secure data storage and logging
5. 1KB shared cryptography memory
6. Configurable OTP and HSM exclusive flash sections
7. Hardware cryptography (AES, Hash, PKC, TRNG)
8. Immobilizer (theft protection)
9. Secure flash loading

We are excited to announce that we have ported wolfCrypt to the TriCore HSM. This will extend the HSM functionality beyond the hardware cryptography support to include the full wolfCrypt suite in the HSM environment. This adds useful features such as:

1. AES256-ECB/CBC/GCM
2. ECDSA-384
3. ECC
4. RSA (2048/3072/4096)
5. SHA-384/512
6. NIST Compliant DRBG (with HW TRNG seed)
7. CMAC/GMAC/HMAC

Technicals

• Built and tested using arm-none-eabi-gcc 12.2 toolchain
• Executed on a TC3XX HSM module with -O2 optimizations at clock of 100Mhz
• Verified heap-only as well as stack-only usage
• Benchmarks executed with a 10ms timer

wolfCrypt Benchmark (block bytes 1024, min 1.0 sec each)
RNG                775 KB took 1.010 seconds,  767.327 KB/s
AES-128-CBC-enc    325 KB took 1.010 seconds,  321.782 KB/s
AES-128-CBC-dec    325 KB took 1.000 seconds,  325.000 KB/s
AES-192-CBC-enc    250 KB took 1.040 seconds,  240.385 KB/s
AES-192-CBC-dec    250 KB took 1.020 seconds,  245.098 KB/s
AES-256-CBC-enc    200 KB took 1.010 seconds,  198.020 KB/s
AES-256-CBC-dec    200 KB took 1.000 seconds,  200.000 KB/s
AES-128-GCM-enc    275 KB took 1.050 seconds,  261.905 KB/s
AES-128-GCM-dec    275 KB took 1.050 seconds,  261.905 KB/s
AES-192-GCM-enc    225 KB took 1.100 seconds,  204.545 KB/s
AES-192-GCM-dec    225 KB took 1.110 seconds,  202.703 KB/s
AES-256-GCM-enc    175 KB took 1.030 seconds,  169.903 KB/s
AES-256-GCM-dec    175 KB took 1.020 seconds,  171.569 KB/s
GMAC Table 4-bit     1 MB took 1.000 seconds,    1.288 MB/s
AES-128-ECB-enc    314 KB took 1.000 seconds,  313.672 KB/s
AES-128-ECB-dec    343 KB took 1.000 seconds,  342.578 KB/s
AES-192-ECB-enc    225 KB took 1.000 seconds,  225.000 KB/s
AES-192-ECB-dec    236 KB took 1.000 seconds,  235.938 KB/s
AES-256-ECB-enc    200 KB took 1.000 seconds,  199.609 KB/s
AES-256-ECB-dec    189 KB took 1.000 seconds,  189.453 KB/s
SHA                  2 MB took 1.000 seconds,    1.953 MB/s
SHA-256              2 MB took 1.000 seconds,    2.051 MB/s
SHA-384            275 KB took 1.030 seconds,  266.990 KB/s
AES-128-CMAC       300 KB took 1.030 seconds,  291.262 KB/s
AES-256-CMAC       200 KB took 1.070 seconds,  186.916 KB/s
HMAC-SHA             2 MB took 1.000 seconds,    2.222 MB/s
HMAC-SHA256          2 MB took 1.000 seconds,    2.051 MB/s
HMAC-SHA384        275 KB took 1.040 seconds,  264.423 KB/s
RSA     2048 public         38 ops took 1.010 sec, avg 26.579 ms, 37.624 ops/sec
RSA     2048 private         2 ops took 1.950 sec, avg 975.000 ms, 1.026 ops/sec
ECC   [      SECP384R1]   384 key gen         6 ops took 1.080 sec, avg 180.000 ms, 5.556 ops/sec
ECDHE [      SECP384R1]   384 agree           4 ops took 1.560 sec, avg 390.000 ms, 2.564 ops/sec
ECDSA [      SECP384R1]   384 sign            6 ops took 1.340 sec, avg 223.333 ms, 4.478 ops/sec
ECDSA [      SECP384R1]   384 verify          2 ops took 1.020 sec, avg 510.000 ms, 1.961 ops/sec
Benchmark complete
Benchmark Test: Return code 0