src/pubkey.cpp

   1 // Copyright (c) 2009-2014 The Bitcoin Core developers
   2 // Distributed under the MIT software license, see the accompanying
   3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   4
   5 #include "pubkey.h"
   6
   7 #include "eccryptoverify.h"
   8
   9 #include "ecwrapper.h"
  10
  11 bool CPubKey::Verify(const uint256 &hash, const std::vector<unsigned char>& vchSig) const {
  12     if (!IsValid())
  13         return false;
  14     CECKey key;
  15     if (!key.SetPubKey(begin(), size()))
  16         return false;
  17     if (!key.Verify(hash, vchSig))
  18         return false;
  19     return true;
  20 }
  21
  22 bool CPubKey::RecoverCompact(const uint256 &hash, const std::vector<unsigned char>& vchSig) {
  23     if (vchSig.size() != 65)
  24         return false;
  25     int recid = (vchSig[0] - 27) & 3;
  26     bool fComp = ((vchSig[0] - 27) & 4) != 0;
  27     CECKey key;
  28     if (!key.Recover(hash, &vchSig[1], recid))
  29         return false;
  30     std::vector<unsigned char> pubkey;
  31     key.GetPubKey(pubkey, fComp);
  32     Set(pubkey.begin(), pubkey.end());
  33     return true;
  34 }
  35
  36 bool CPubKey::IsFullyValid() const {
  37     if (!IsValid())
  38         return false;
  39     CECKey key;
  40     if (!key.SetPubKey(begin(), size()))
  41         return false;
  42     return true;
  43 }
  44
  45 bool CPubKey::Decompress() {
  46     if (!IsValid())
  47         return false;
  48     CECKey key;
  49     if (!key.SetPubKey(begin(), size()))
  50         return false;
  51     std::vector<unsigned char> pubkey;
  52     key.GetPubKey(pubkey, false);
  53     Set(pubkey.begin(), pubkey.end());
  54     return true;
  55 }
  56
  57 bool CPubKey::Derive(CPubKey& pubkeyChild, ChainCode &ccChild, unsigned int nChild, const ChainCode& cc) const {
  58     assert(IsValid());
  59     assert((nChild >> 31) == 0);
  60     assert(begin() + 33 == end());
  61     unsigned char out[64];
  62     BIP32Hash(cc, nChild, *begin(), begin()+1, out);
  63     memcpy(ccChild.begin(), out+32, 32);
  64     CECKey key;
  65     bool ret = key.SetPubKey(begin(), size());
  66     ret &= key.TweakPublic(out);
  67     std::vector<unsigned char> pubkey;
  68     key.GetPubKey(pubkey, true);
  69     pubkeyChild.Set(pubkey.begin(), pubkey.end());
  70     return ret;
  71 }
  72
  73 void CExtPubKey::Encode(unsigned char code[74]) const {
  74     code[0] = nDepth;
  75     memcpy(code+1, vchFingerprint, 4);
  76     code[5] = (nChild >> 24) & 0xFF; code[6] = (nChild >> 16) & 0xFF;
  77     code[7] = (nChild >>  8) & 0xFF; code[8] = (nChild >>  0) & 0xFF;
  78     memcpy(code+9, chaincode.begin(), 32);
  79     assert(pubkey.size() == 33);
  80     memcpy(code+41, pubkey.begin(), 33);
  81 }
  82
  83 void CExtPubKey::Decode(const unsigned char code[74]) {
  84     nDepth = code[0];
  85     memcpy(vchFingerprint, code+1, 4);
  86     nChild = (code[5] << 24) | (code[6] << 16) | (code[7] << 8) | code[8];
  87     memcpy(chaincode.begin(), code+9, 32);
  88     pubkey.Set(code+41, code+74);
  89 }
  90
  91 bool CExtPubKey::Derive(CExtPubKey &out, unsigned int nChild) const {
  92     out.nDepth = nDepth + 1;
  93     CKeyID id = pubkey.GetID();
  94     memcpy(&out.vchFingerprint[0], &id, 4);
  95     out.nChild = nChild;
  96     return pubkey.Derive(out.pubkey, out.chaincode, nChild, chaincode);
  97 }