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I was tracing a signature verification issue in a nocgo build and found that `VerifySignature` doesn't validate hash length. #33104 added the check to `Sign` and `sigToPub` but missed this one. The cgo path in `secp256k1/secp256.go` already rejects non-32-byte hashes, so the nocgo path should do the same — otherwise a wrong-length hash gets passed to decred's `Verify` and silently gives a bogus result.
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