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Sign and verify message with bitcoin address and public key

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Add padding to input (fixed string + address) before hashing
This commit is contained in:
Khalahan 2011-04-24 14:27:52 +02:00 committed by Pieter Wuille
parent e93bf37e86
commit cc2567e32f
1 changed files with 66 additions and 0 deletions
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66
src/bitcoinrpc.cpp
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@ -526,6 +526,70 @@ Value sendtoaddress(const Array& params, bool fHelp)
return wtx.GetHash().GetHex();
}
Value signmessage(const Array& params, bool fHelp)
{
if (fHelp || params.size() != 2)
throw runtime_error(
"signmessage <bitcoinaddress> <message>\n"
"Sign a message with the private key of an address");
string strAddress = params[0].get_str();
string strMessage = params[1].get_str();
strMessage.insert(0, "Padding text - ");
uint160 hash160;
if(!AddressToHash160(strAddress, hash160))
throw JSONRPCError(-3, "Invalid address");
vector<unsigned char>& vchPubKey = mapPubKeys[hash160];
CKey key;
if(!key.SetPubKey(vchPubKey))
throw JSONRPCError(-3, "Public key not found");
strMessage.insert(0, HexStr(vchPubKey.begin(), vchPubKey.end()).c_str());
vector<unsigned char> vchMsg(strMessage.begin(), strMessage.end());
vector<unsigned char> vchSig;
if (!CKey::Sign(mapKeys[vchPubKey], Hash(vchMsg.begin(), vchMsg.end()), vchSig))
throw JSONRPCError(-3, "Sign failed");
Object obj;
obj.push_back(Pair("address", strAddress));
obj.push_back(Pair("pubkey", HexStr(vchPubKey.begin(), vchPubKey.end()).c_str()));
obj.push_back(Pair("sign", HexStr(vchSig.begin(), vchSig.end()).c_str()));
return obj;
}
Value verifymessage(const Array& params, bool fHelp)
{
if (fHelp || params.size() != 3)
throw runtime_error(
"verifymessage <pubkey> <sign> <message>\n"
"Verify a signed message with the public key");
string strPubKey = params[0].get_str();
string strSign = params[1].get_str();
string strMessage = params[2].get_str();
strMessage.insert(0, "Padding text - ");
strMessage.insert(0, strPubKey.c_str());
vector<unsigned char> vchPubKey = ParseHex(strPubKey);
vector<unsigned char> vchSig = ParseHex(strSign);
vector<unsigned char> vchMsg(strMessage.begin(), strMessage.end());
CKey key;
if(!key.SetPubKey(vchPubKey))
throw JSONRPCError(-3, "Invalid pubkey");
if (!key.Verify(Hash(vchMsg.begin(), vchMsg.end()), vchSig))
throw JSONRPCError(-3, "Verify failed");
Object obj;
obj.push_back(Pair("address", PubKeyToAddress(vchPubKey)));
obj.push_back(Pair("pubkey", strPubKey.c_str()));
return obj;
}
Value getreceivedbyaddress(const Array& params, bool fHelp)
{
@ -1636,6 +1700,8 @@ pair<string, rpcfn_type> pCallTable[] =
make_pair("sendmany", &sendmany),
make_pair("gettransaction", &gettransaction),
make_pair("listtransactions", &listtransactions),
make_pair("signmessage", &signmessage),
make_pair("verifymessage", &verifymessage),
make_pair("getwork", &getwork),
make_pair("listaccounts", &listaccounts),
make_pair("settxfee", &settxfee),