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Self-contained C11 SHA-2 implementation.

Features:

  • Self-contained (no external dependencies)
  • C11 only (platform-agnostic)
  • MIT-licensed
  • Includes test vectors (via make test)

Includes implementations of the following:

  • SHA-224
  • SHA-256
  • SHA-384
  • SHA-512
  • HMAC-SHA-256
  • HMAC-SHA-512

Usage

See tests.c for usage.

Use make test to run the test vectors.

Benchmarks

Benchmarks.

Partially unrolled compression makes this implementation faster than coreutils, but slower than the assembly-optimized, architecture and family-specific OpenSSL implementation.

> time -p ./sha256 ~/Videos/8x*avi > /dev/null
rleal 9.39
user 9.10
sys 0.29
> time -p sha256sum ~/Videos/8x*avi > /dev/null
real 12.04
user 11.73
sys 0.31
> time -p openssl sha256 ~/Videos/8x*avi > /dev/null
real 6.36
user 6.01
sys 0.32

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C11 SHA-2 implementation.

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