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Support for Schnorr signatures and integration in SignatureCheckers (BIP 340)

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This enables the schnorrsig module in libsecp256k1, adds the relevant types
and functions to src/pubkey, as well as in higher-level `SignatureChecker`
classes. The (verification side of the) BIP340 test vectors is also added.
This commit is contained in:
Pieter Wuille
2020-09-11 14:33:30 -07:00
parent 5de246ca81
commit 0664f5fe1f
14 changed files with 165 additions and 13 deletions
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30
src/script/interpreter.cpp
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@@ -1521,6 +1521,12 @@ bool GenericTransactionSignatureChecker<T>::VerifyECDSASignature(const std::vect
return pubkey.Verify(sighash, vchSig);
}
template <class T>
bool GenericTransactionSignatureChecker<T>::VerifySchnorrSignature(Span<const unsigned char> sig, const XOnlyPubKey& pubkey, const uint256& sighash) const
{
return pubkey.VerifySchnorr(sighash, sig);
}
template <class T>
bool GenericTransactionSignatureChecker<T>::CheckECDSASignature(const std::vector<unsigned char>& vchSigIn, const std::vector<unsigned char>& vchPubKey, const CScript& scriptCode, SigVersion sigversion) const
{
@@ -1543,6 +1549,30 @@ bool GenericTransactionSignatureChecker<T>::CheckECDSASignature(const std::vecto
return true;
}
template <class T>
bool GenericTransactionSignatureChecker<T>::CheckSchnorrSignature(Span<const unsigned char> sig, Span<const unsigned char> pubkey_in, SigVersion sigversion, ScriptError* serror) const
{
assert(sigversion == SigVersion::TAPROOT);
// Schnorr signatures have 32-byte public keys. The caller is responsible for enforcing this.
assert(pubkey_in.size() == 32);
if (sig.size() != 64 && sig.size() != 65) return set_error(serror, SCRIPT_ERR_SCHNORR_SIG_SIZE);
XOnlyPubKey pubkey{pubkey_in};
uint8_t hashtype = SIGHASH_DEFAULT;
if (sig.size() == 65) {
hashtype = SpanPopBack(sig);
if (hashtype == SIGHASH_DEFAULT) return set_error(serror, SCRIPT_ERR_SCHNORR_SIG_HASHTYPE);
}
uint256 sighash;
assert(this->txdata);
if (!SignatureHashSchnorr(sighash, *txTo, nIn, hashtype, sigversion, *this->txdata)) {
return set_error(serror, SCRIPT_ERR_SCHNORR_SIG_HASHTYPE);
}
if (!VerifySchnorrSignature(sig, pubkey, sighash)) return set_error(serror, SCRIPT_ERR_SCHNORR_SIG);
return true;
}
template <class T>
bool GenericTransactionSignatureChecker<T>::CheckLockTime(const CScriptNum& nLockTime) const
{