antiklepto: validate ECDSA signatures - #129
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Use shared compact and recoverable ECDSA validators for direct signing responses and from inside Anti-Klepto verification. Reject malformed scalars, high-S encodings, and recovery IDs outside the secp256k1 range before accepting signatures. Accept recovery IDs 0..3 for all recoverable ECDSA signatures. Add regression tests and prepare Rust 0.13.1 release metadata.
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Use shared compact and recoverable ECDSA validators for direct
signing responses and from inside Anti-Klepto verification. Reject
malformed scalars, high-S encodings, and recovery IDs outside the
secp256k1 range before accepting signatures.
Accept recovery IDs 0..3 for all recoverable ECDSA signatures.
Add regression tests and prepare Rust 0.13.1 release metadata.
Same change as in BitBoxSwiss/bitbox02-api-go#175