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Crypto Performance

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Artem Yushev edited this page Jan 20, 2020 · 5 revisions

I2C Fast Mode (400KHz)

  • Without power limitation
  • @ 25°C
  • VCC = 3.3V
  • RSA Signature scheme: RSA SSA PKCS#1 v1.5 without hashing
  • ECDSA Signature scheme: ECDSA FIPS 186-3 without hashing
  • Encryption/Decryption scheme: RSAES PKCS#1 v1.5
  • Hash scheme: SHA256
  • Key Derivation scheme: TLS v1.2 PRF SHA256
  • RSA Key size: 2048 bits
  • ECC Key size: 256 bits (NIST P-256)
Scheme Algorithm Performance in ms1 Performance with Shielded Connection in ms1 Notes
Calcualte Signature RSA ~310 ~315 Doesn't include message hashing before calling a toolbox funciton
ECDSA ~60 ~65
Verify signature RSA ~45 ~55
ECDSA ~85 ~90
Diffie-Hellman key agreement ECC ~60 ~65 Based on ephemeral key pair
Key pair generation RSA ~29002 ~2910 Generate 2048 bit RSA key pair
ECC ~75 ~80 Generate 256 bit ECC key pair
Encryption RSA ~30 ~45 Encrypt 127 bytes
Decryption RSA ~310 ~320 Decrypt 127 bytes
Key derivation PRF as per TLS v1.2 ~135 ~150
Hash calculation SHA256 ~5 Kbyte/s ~4.5 Kbyte/s In blocks of 500 bytes
Write Data N/A 18 - 100 bytes
Read Data N/A 9 - 100 bytes

1 Minimum Execution of the entire sequence in milli seconds, except the External World timings

2 RSA key pair generation performance is not predictable and typically have a variation in performance. This could be significantly higher or lower as the one specified in the table which is an average value over collected samples

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