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sign: Add CreateMuSig2Nonce

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This commit is contained in:
Ava Chow
2024-02-12 15:31:16 -05:00
parent 82ea67c607
commit 512b17fc56
7 changed files with 88 additions and 1 deletions
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36
src/script/sign.cpp
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@@ -7,8 +7,10 @@
#include <consensus/amount.h>
#include <key.h>
#include <musig.h>
#include <policy/policy.h>
#include <primitives/transaction.h>
#include <random.h>
#include <script/keyorigin.h>
#include <script/miniscript.h>
#include <script/script.h>
@@ -100,6 +102,34 @@ bool MutableTransactionSignatureCreator::CreateSchnorrSig(const SigningProvider&
return true;
}
std::vector<uint8_t> MutableTransactionSignatureCreator::CreateMuSig2Nonce(const SigningProvider& provider, const CPubKey& aggregate_pubkey, const CPubKey& script_pubkey, const CPubKey& part_pubkey, const uint256* leaf_hash, const uint256* merkle_root, SigVersion sigversion, const SignatureData& sigdata) const
{
assert(sigversion == SigVersion::TAPROOT || sigversion == SigVersion::TAPSCRIPT);
// Retrieve the private key
CKey key;
if (!provider.GetKey(part_pubkey.GetID(), key)) return {};
// Retrieve participant pubkeys
auto it = sigdata.musig2_pubkeys.find(aggregate_pubkey);
if (it == sigdata.musig2_pubkeys.end()) return {};
const std::vector<CPubKey>& pubkeys = it->second;
if (std::find(pubkeys.begin(), pubkeys.end(), part_pubkey) == pubkeys.end()) return {};
// Compute sighash
std::optional<uint256> sighash = ComputeSchnorrSignatureHash(leaf_hash, sigversion);
if (!sighash.has_value()) return {};
MuSig2SecNonce secnonce;
std::vector<uint8_t> out = key.CreateMuSig2Nonce(secnonce, *sighash, aggregate_pubkey, pubkeys);
if (out.empty()) return {};
// Store the secnonce in the SigningProvider
provider.SetMuSig2SecNonce(MuSig2SessionID(script_pubkey, part_pubkey, *sighash), std::move(secnonce));
return out;
}
static bool GetCScript(const SigningProvider& provider, const SignatureData& sigdata, const CScriptID& scriptid, CScript& script)
{
if (provider.GetCScript(scriptid, script)) {
@@ -755,6 +785,12 @@ public:
sig.assign(64, '\000');
return true;
}
std::vector<uint8_t> CreateMuSig2Nonce(const SigningProvider& provider, const CPubKey& aggregate_pubkey, const CPubKey& script_pubkey, const CPubKey& part_pubkey, const uint256* leaf_hash, const uint256* merkle_root, SigVersion sigversion, const SignatureData& sigdata) const override
{
std::vector<uint8_t> out;
out.assign(MUSIG2_PUBNONCE_SIZE, '\000');
return out;
}
};
}