131 lines
3.8 KiB
C++
131 lines
3.8 KiB
C++
// Copyright (c) 2009-2014 The Bitcoin developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include "pubkey.h"
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#include "eccryptoverify.h"
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#ifdef USE_SECP256K1
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#include <secp256k1.h>
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#else
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#include "ecwrapper.h"
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#endif
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bool CPubKey::Verify(const uint256 &hash, const std::vector<unsigned char>& vchSig) const {
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if (!IsValid())
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return false;
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#ifdef USE_SECP256K1
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if (secp256k1_ecdsa_verify((const unsigned char*)&hash, 32, &vchSig[0], vchSig.size(), begin(), size()) != 1)
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return false;
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#else
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CECKey key;
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if (!key.SetPubKey(begin(), size()))
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return false;
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if (!key.Verify(hash, vchSig))
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return false;
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#endif
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return true;
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}
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bool CPubKey::RecoverCompact(const uint256 &hash, const std::vector<unsigned char>& vchSig) {
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if (vchSig.size() != 65)
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return false;
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int recid = (vchSig[0] - 27) & 3;
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bool fComp = ((vchSig[0] - 27) & 4) != 0;
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#ifdef USE_SECP256K1
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int pubkeylen = 65;
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if (!secp256k1_ecdsa_recover_compact((const unsigned char*)&hash, 32, &vchSig[1], (unsigned char*)begin(), &pubkeylen, fComp, recid))
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return false;
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assert((int)size() == pubkeylen);
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#else
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CECKey key;
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if (!key.Recover(hash, &vchSig[1], recid))
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return false;
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std::vector<unsigned char> pubkey;
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key.GetPubKey(pubkey, fComp);
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Set(pubkey.begin(), pubkey.end());
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#endif
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return true;
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}
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bool CPubKey::IsFullyValid() const {
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if (!IsValid())
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return false;
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#ifdef USE_SECP256K1
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if (!secp256k1_ecdsa_pubkey_verify(begin(), size()))
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return false;
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#else
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CECKey key;
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if (!key.SetPubKey(begin(), size()))
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return false;
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#endif
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return true;
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}
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bool CPubKey::Decompress() {
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if (!IsValid())
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return false;
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#ifdef USE_SECP256K1
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int clen = size();
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int ret = secp256k1_ecdsa_pubkey_decompress((unsigned char*)begin(), &clen);
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assert(ret);
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assert(clen == (int)size());
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#else
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CECKey key;
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if (!key.SetPubKey(begin(), size()))
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return false;
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std::vector<unsigned char> pubkey;
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key.GetPubKey(pubkey, false);
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Set(pubkey.begin(), pubkey.end());
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#endif
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return true;
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}
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bool CPubKey::Derive(CPubKey& pubkeyChild, unsigned char ccChild[32], unsigned int nChild, const unsigned char cc[32]) const {
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assert(IsValid());
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assert((nChild >> 31) == 0);
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assert(begin() + 33 == end());
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unsigned char out[64];
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BIP32Hash(cc, nChild, *begin(), begin()+1, out);
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memcpy(ccChild, out+32, 32);
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#ifdef USE_SECP256K1
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pubkeyChild = *this;
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bool ret = secp256k1_ecdsa_pubkey_tweak_add((unsigned char*)pubkeyChild.begin(), pubkeyChild.size(), out);
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#else
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CECKey key;
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bool ret = key.SetPubKey(begin(), size());
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ret &= key.TweakPublic(out);
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std::vector<unsigned char> pubkey;
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key.GetPubKey(pubkey, true);
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pubkeyChild.Set(pubkey.begin(), pubkey.end());
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#endif
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return ret;
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}
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void CExtPubKey::Encode(unsigned char code[74]) const {
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code[0] = nDepth;
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memcpy(code+1, vchFingerprint, 4);
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code[5] = (nChild >> 24) & 0xFF; code[6] = (nChild >> 16) & 0xFF;
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code[7] = (nChild >> 8) & 0xFF; code[8] = (nChild >> 0) & 0xFF;
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memcpy(code+9, vchChainCode, 32);
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assert(pubkey.size() == 33);
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memcpy(code+41, pubkey.begin(), 33);
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}
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void CExtPubKey::Decode(const unsigned char code[74]) {
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nDepth = code[0];
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memcpy(vchFingerprint, code+1, 4);
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nChild = (code[5] << 24) | (code[6] << 16) | (code[7] << 8) | code[8];
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memcpy(vchChainCode, code+9, 32);
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pubkey.Set(code+41, code+74);
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}
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bool CExtPubKey::Derive(CExtPubKey &out, unsigned int nChild) const {
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out.nDepth = nDepth + 1;
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CKeyID id = pubkey.GetID();
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memcpy(&out.vchFingerprint[0], &id, 4);
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out.nChild = nChild;
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return pubkey.Derive(out.pubkey, out.vchChainCode, nChild, vchChainCode);
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}
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