firmware: validate antiklepto signatures - #175
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Use shared compact and recoverable ECDSA validators for direct signing responses and from inside Anti-Klepto verification. Reject invalid scalars, high-S encodings, and recovery IDs outside the secp256k1 range. Accept recovery IDs 0..3 for all recoverable ECDSA signatures. Add regression coverage for malformed signatures.
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Use shared compact and recoverable ECDSA validators for direct
signing responses and from inside Anti-Klepto verification. Reject
invalid scalars, high-S encodings, and recovery IDs outside the
secp256k1 range.
Accept recovery IDs 0..3 for all recoverable ECDSA signatures.
Add regression coverage for malformed signatures.
Same change as in BitBoxSwiss/bitbox-api-rs#129