Add EC-SDSA (Schnorr) signatures with SHA-256/SHA-512 support#242
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yplo wants to merge 1 commit intokmackay:masterfrom
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Add EC-SDSA (Schnorr) signatures with SHA-256/SHA-512 support#242yplo wants to merge 1 commit intokmackay:masterfrom
yplo wants to merge 1 commit intokmackay:masterfrom
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uECC.h / uECC.c:
- uECC_SUPPORTS_ECDSA macro wraps existing sign/verify block.
- EC-SDSA (Schnorr) sign and verify for two variants:
Optimized: R = Hash(x1 || M)
Standard: R = Hash(x1 || y1 || M)
Shared impl in ecsdsa_sign_impl / ecsdsa_verify_impl (include_y flag).
- Public API: uECC_ecsdsa_sign/verify_optimized, uECC_ecsdsa_sign/verify_standard.
- Three-level preprocessor gates (all default to 1):
uECC_SUPPORTS_ECDSA
uECC_SUPPORTS_ECSDSA_OPTIMIZED
uECC_SUPPORTS_ECSDSA_STANDARD
Set any to 0 to strip the corresponding code from the build.
- bits2int and smax are common helpers kept outside all guards.
uECC_hash.h / uECC_hash.c:
- Self-contained SHA-256 and SHA-512 uECC_HashContext adapters.
- DISABLED BY DEFAULT (uECC_SUPPORTS_SHA256/SHA512 default to 0).
Projects with an existing hash library incur zero cost.
- Each context embeds its own scratch buffer; no heap allocation needed.
test/test_ecsdsa.c:
- Known-answer vector tests for both variants x both hashes
(secp256r1, M = "abc"):
SHA-256 optimized, SHA-256 standard
SHA-512 optimized, SHA-512 standard
- Random round-trip tests: 64 iterations x 5 curves x 2 variants x 2 hashes.
README.md:
- Documents EC-SDSA variants, hash support, and all preprocessor gates.
.gitignore: exclude *.obj and *.exe build artifacts.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Add macro-preprocessor to enable/disable EC variants (EC-DSA or EC-SDSA) for code size optimisations.
Add new EC variant (EC-SDSA) to uECC.