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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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15
src/pubkey.cpp
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@@ -7,6 +7,7 @@
#include <secp256k1.h>
#include <secp256k1_recovery.h>
#include <secp256k1_schnorrsig.h>
namespace
{
@@ -166,6 +167,20 @@ int ecdsa_signature_parse_der_lax(const secp256k1_context* ctx, secp256k1_ecdsa_
return 1;
}
XOnlyPubKey::XOnlyPubKey(Span<const unsigned char> bytes)
{
assert(bytes.size() == 32);
std::copy(bytes.begin(), bytes.end(), m_keydata.begin());
}
bool XOnlyPubKey::VerifySchnorr(const uint256& msg, Span<const unsigned char> sigbytes) const
{
assert(sigbytes.size() == 64);
secp256k1_xonly_pubkey pubkey;
if (!secp256k1_xonly_pubkey_parse(secp256k1_context_verify, &pubkey, m_keydata.data())) return false;
return secp256k1_schnorrsig_verify(secp256k1_context_verify, sigbytes.data(), msg.begin(), &pubkey);
}
bool CPubKey::Verify(const uint256 &hash, const std::vector<unsigned char>& vchSig) const {
if (!IsValid())
return false;