diff options
| -rw-r--r-- | src/bitcoinrpc.cpp | 105 | ||||
| -rw-r--r-- | src/key.h | 140 | ||||
| -rw-r--r-- | src/test/base64_tests.cpp | 20 | ||||
| -rw-r--r-- | src/test/test_bitcoin.cpp | 1 | ||||
| -rw-r--r-- | src/util.cpp | 140 | ||||
| -rw-r--r-- | src/util.h | 4 |
6 files changed, 372 insertions, 38 deletions
diff --git a/src/bitcoinrpc.cpp b/src/bitcoinrpc.cpp index c26ba55d81..1e7ffe6310 100644 --- a/src/bitcoinrpc.cpp +++ b/src/bitcoinrpc.cpp @@ -526,6 +526,72 @@ Value sendtoaddress(const Array& params, bool fHelp) return wtx.GetHash().GetHex(); } +static const string strMessageMagic = "Bitcoin Signed Message:\n"; + +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"); + + if (pwalletMain->IsLocked()) + throw JSONRPCError(-13, "Error: Please enter the wallet passphrase with walletpassphrase first."); + + string strAddress = params[0].get_str(); + string strMessage = params[1].get_str(); + + CBitcoinAddress addr(strAddress); + if (!addr.IsValid()) + throw JSONRPCError(-3, "Invalid address"); + + CKey key; + if (!pwalletMain->GetKey(addr, key)) + throw JSONRPCError(-4, "Private key not available"); + + CDataStream ss(SER_GETHASH); + ss << strMessageMagic; + ss << strMessage; + + vector<unsigned char> vchSig; + if (!key.SignCompact(Hash(ss.begin(), ss.end()), vchSig)) + throw JSONRPCError(-5, "Sign failed"); + + return EncodeBase64(&vchSig[0], vchSig.size()); +} + +Value verifymessage(const Array& params, bool fHelp) +{ + if (fHelp || params.size() != 3) + throw runtime_error( + "verifymessage <bitcoinaddress> <signature> <message>\n" + "Verify a signed message"); + + string strAddress = params[0].get_str(); + string strSign = params[1].get_str(); + string strMessage = params[2].get_str(); + + CBitcoinAddress addr(strAddress); + if (!addr.IsValid()) + throw JSONRPCError(-3, "Invalid address"); + + bool fInvalid = false; + vector<unsigned char> vchSig = DecodeBase64(strSign.c_str(), &fInvalid); + + if (fInvalid) + throw JSONRPCError(-5, "Malformed base64 encoding"); + + CDataStream ss(SER_GETHASH); + ss << strMessageMagic; + ss << strMessage; + + CKey key; + if (!key.SetCompactSignature(Hash(ss.begin(), ss.end()), vchSig)) + return false; + + return (key.GetAddress() == addr); +} + Value getreceivedbyaddress(const Array& params, bool fHelp) { @@ -1627,6 +1693,8 @@ 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), @@ -1799,43 +1867,6 @@ int ReadHTTP(std::basic_istream<char>& stream, map<string, string>& mapHeadersRe return nStatus; } -string EncodeBase64(string s) -{ - BIO *b64, *bmem; - BUF_MEM *bptr; - - b64 = BIO_new(BIO_f_base64()); - BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL); - bmem = BIO_new(BIO_s_mem()); - b64 = BIO_push(b64, bmem); - BIO_write(b64, s.c_str(), s.size()); - BIO_flush(b64); - BIO_get_mem_ptr(b64, &bptr); - - string result(bptr->data, bptr->length); - BIO_free_all(b64); - - return result; -} - -string DecodeBase64(string s) -{ - BIO *b64, *bmem; - - char* buffer = static_cast<char*>(calloc(s.size(), sizeof(char))); - - b64 = BIO_new(BIO_f_base64()); - BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL); - bmem = BIO_new_mem_buf(const_cast<char*>(s.c_str()), s.size()); - bmem = BIO_push(b64, bmem); - BIO_read(bmem, buffer, s.size()); - BIO_free_all(bmem); - - string result(buffer); - free(buffer); - return result; -} - bool HTTPAuthorized(map<string, string>& mapHeaders) { string strAuth = mapHeaders["authorization"]; @@ -75,6 +75,76 @@ err: return(ok); } +int static inline ECDSA_SIG_recover_key_GFp(EC_KEY *eckey, ECDSA_SIG *ecsig, const unsigned char *msg, int msglen, int recid, int check) +{ + if (!eckey) return 0; + + int ret = 0; + BN_CTX *ctx = NULL; + + BIGNUM *x = NULL; + BIGNUM *e = NULL; + BIGNUM *order = NULL; + BIGNUM *sor = NULL; + BIGNUM *eor = NULL; + BIGNUM *field = NULL; + EC_POINT *R = NULL; + EC_POINT *O = NULL; + EC_POINT *Q = NULL; + BIGNUM *rr = NULL; + BIGNUM *zero = NULL; + int n = 0; + int i = recid / 2; + + const EC_GROUP *group = EC_KEY_get0_group(eckey); + if ((ctx = BN_CTX_new()) == NULL) { ret = -1; goto err; } + BN_CTX_start(ctx); + order = BN_CTX_get(ctx); + if (!EC_GROUP_get_order(group, order, ctx)) { ret = -2; goto err; } + x = BN_CTX_get(ctx); + if (!BN_copy(x, order)) { ret=-1; goto err; } + if (!BN_mul_word(x, i)) { ret=-1; goto err; } + if (!BN_add(x, x, ecsig->r)) { ret=-1; goto err; } + field = BN_CTX_get(ctx); + if (!EC_GROUP_get_curve_GFp(group, field, NULL, NULL, ctx)) { ret=-2; goto err; } + if (BN_cmp(x, field) >= 0) { ret=0; goto err; } + if ((R = EC_POINT_new(group)) == NULL) { ret = -2; goto err; } + if (!EC_POINT_set_compressed_coordinates_GFp(group, R, x, recid % 2, ctx)) { ret=0; goto err; } + if (check) + { + if ((O = EC_POINT_new(group)) == NULL) { ret = -2; goto err; } + if (!EC_POINT_mul(group, O, NULL, R, order, ctx)) { ret=-2; goto err; } + if (!EC_POINT_is_at_infinity(group, O)) { ret = 0; goto err; } + } + if ((Q = EC_POINT_new(group)) == NULL) { ret = -2; goto err; } + n = EC_GROUP_get_degree(group); + e = BN_CTX_get(ctx); + if (!BN_bin2bn(msg, msglen, e)) { ret=-1; goto err; } + if (8*msglen > n) BN_rshift(e, e, 8-(n & 7)); + zero = BN_CTX_get(ctx); + if (!BN_zero(zero)) { ret=-1; goto err; } + if (!BN_mod_sub(e, zero, e, order, ctx)) { ret=-1; goto err; } + rr = BN_CTX_get(ctx); + if (!BN_mod_inverse(rr, ecsig->r, order, ctx)) { ret=-1; goto err; } + sor = BN_CTX_get(ctx); + if (!BN_mod_mul(sor, ecsig->s, rr, order, ctx)) { ret=-1; goto err; } + eor = BN_CTX_get(ctx); + if (!BN_mod_mul(eor, e, rr, order, ctx)) { ret=-1; goto err; } + if (!EC_POINT_mul(group, Q, eor, R, sor, ctx)) { ret=-2; goto err; } + if (!EC_KEY_set_public_key(eckey, Q)) { ret=-2; goto err; } + + ret = 1; + +err: + if (ctx) { + BN_CTX_end(ctx); + BN_CTX_free(ctx); + } + if (R != NULL) EC_POINT_free(R); + if (O != NULL) EC_POINT_free(O); + if (Q != NULL) EC_POINT_free(Q); + return ret; +} class key_error : public std::runtime_error { @@ -221,6 +291,66 @@ public: return true; } + // create a compact signature (65 bytes), which allows reconstructing the used public key + bool SignCompact(uint256 hash, std::vector<unsigned char>& vchSig) + { + bool fOk = false; + ECDSA_SIG *sig = ECDSA_do_sign((unsigned char*)&hash, sizeof(hash), pkey); + if (sig==NULL) + return false; + vchSig.clear(); + vchSig.resize(65,0); + int nBitsR = BN_num_bits(sig->r); + int nBitsS = BN_num_bits(sig->s); + if (nBitsR <= 256 && nBitsS <= 256) + { + int nRecId = -1; + for (int i=0; i<4; i++) + { + CKey keyRec; + keyRec.fSet = true; + if (ECDSA_SIG_recover_key_GFp(keyRec.pkey, sig, (unsigned char*)&hash, sizeof(hash), i, 1) == 1) + if (keyRec.GetPubKey() == this->GetPubKey()) + { + nRecId = i; + break; + } + } + + if (nRecId == -1) + throw key_error("CKEy::SignCompact() : unable to construct recoverable key"); + + vchSig[0] = nRecId+27; + BN_bn2bin(sig->r,&vchSig[33-(nBitsR+7)/8]); + BN_bn2bin(sig->s,&vchSig[65-(nBitsS+7)/8]); + fOk = true; + } + ECDSA_SIG_free(sig); + return fOk; + } + + // reconstruct public key from a compact signature + bool SetCompactSignature(uint256 hash, const std::vector<unsigned char>& vchSig) + { + if (vchSig.size() != 65) + return false; + if (vchSig[0]<27 || vchSig[0]>=31) + return false; + ECDSA_SIG *sig = ECDSA_SIG_new(); + BN_bin2bn(&vchSig[1],32,sig->r); + BN_bin2bn(&vchSig[33],32,sig->s); + + EC_KEY_free(pkey); + pkey = EC_KEY_new_by_curve_name(NID_secp256k1); + if (ECDSA_SIG_recover_key_GFp(pkey, sig, (unsigned char*)&hash, sizeof(hash), vchSig[0] - 27, 0) == 1) + { + fSet = true; + ECDSA_SIG_free(sig); + return true; + } + return false; + } + bool Verify(uint256 hash, const std::vector<unsigned char>& vchSig) { // -1 = error, 0 = bad sig, 1 = good @@ -229,6 +359,16 @@ public: return true; } + bool VerifyCompact(uint256 hash, const std::vector<unsigned char>& vchSig) + { + CKey key; + if (!key.SetCompactSignature(hash, vchSig)) + return false; + if (GetPubKey() != key.GetPubKey()) + return false; + return true; + } + CBitcoinAddress GetAddress() const { return CBitcoinAddress(GetPubKey()); diff --git a/src/test/base64_tests.cpp b/src/test/base64_tests.cpp new file mode 100644 index 0000000000..f30f7f8936 --- /dev/null +++ b/src/test/base64_tests.cpp @@ -0,0 +1,20 @@ +#include <boost/test/unit_test.hpp> + +#include "../util.h" + +BOOST_AUTO_TEST_SUITE(base64_tests) + +BOOST_AUTO_TEST_CASE(base64_testvectors) +{ + static const string vstrIn[] = {"","f","fo","foo","foob","fooba","foobar"}; + static const string vstrOut[] = {"","Zg==","Zm8=","Zm9v","Zm9vYg==","Zm9vYmE=","Zm9vYmFy"}; + for (int i=0; i<sizeof(vstrIn)/sizeof(vstrIn[0]); i++) + { + string strEnc = EncodeBase64(vstrIn[i]); + BOOST_CHECK(strEnc == vstrOut[i]); + string strDec = DecodeBase64(strEnc); + BOOST_CHECK(strDec == vstrIn[i]); + } +} + +BOOST_AUTO_TEST_SUITE_END() diff --git a/src/test/test_bitcoin.cpp b/src/test/test_bitcoin.cpp index c6f6d94b1e..a42ad7524f 100644 --- a/src/test/test_bitcoin.cpp +++ b/src/test/test_bitcoin.cpp @@ -9,6 +9,7 @@ #include "script_tests.cpp" #include "transaction_tests.cpp" #include "DoS_tests.cpp" +#include "base64_tests.cpp" CWallet* pwalletMain; diff --git a/src/util.cpp b/src/util.cpp index a5e3d30995..fb648a9721 100644 --- a/src/util.cpp +++ b/src/util.cpp @@ -443,7 +443,6 @@ vector<unsigned char> ParseHex(const string& str) return ParseHex(str.c_str()); } - void ParseParameters(int argc, char* argv[]) { mapArgs.clear(); @@ -470,6 +469,145 @@ void ParseParameters(int argc, char* argv[]) } } +string EncodeBase64(const unsigned char* pch, size_t len) +{ + static const char *pbase64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; + + string strRet=""; + strRet.reserve((len+2)/3*4); + + int mode=0, left=0; + const unsigned char *pchEnd = pch+len; + + while (pch<pchEnd) + { + int enc = *(pch++); + switch (mode) + { + case 0: // we have no bits + strRet += pbase64[enc >> 2]; + left = (enc & 3) << 4; + mode = 1; + break; + + case 1: // we have two bits + strRet += pbase64[left | (enc >> 4)]; + left = (enc & 15) << 2; + mode = 2; + break; + + case 2: // we have four bits + strRet += pbase64[left | (enc >> 6)]; + strRet += pbase64[enc & 63]; + mode = 0; + break; + } + } + + if (mode) + { + strRet += pbase64[left]; + strRet += '='; + if (mode == 1) + strRet += '='; + } + + return strRet; +} + +string EncodeBase64(const string& str) +{ + return EncodeBase64((const unsigned char*)str.c_str(), str.size()); +} + +vector<unsigned char> DecodeBase64(const char* p, bool* pfInvalid) +{ + static const int decode64_table[256] = + { + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, + -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, + 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, + 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, + 49, 50, 51, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 + }; + + if (pfInvalid) + *pfInvalid = false; + + vector<unsigned char> vchRet; + vchRet.reserve(strlen(p)*3/4); + + int mode = 0; + int left = 0; + + while (1) + { + int dec = decode64_table[*p]; + if (dec == -1) break; + p++; + switch (mode) + { + case 0: // we have no bits and get 6 + left = dec; + mode = 1; + break; + + case 1: // we have 6 bits and keep 4 + vchRet.push_back((left<<2) | (dec>>4)); + left = dec & 15; + mode = 2; + break; + + case 2: // we have 4 bits and get 6, we keep 2 + vchRet.push_back((left<<4) | (dec>>2)); + left = dec & 3; + mode = 3; + break; + + case 3: // we have 2 bits and get 6 + vchRet.push_back((left<<6) | dec); + mode = 0; + break; + } + } + + if (pfInvalid) + switch (mode) + { + case 0: // 4n base64 characters processed: ok + break; + + case 1: // 4n+1 base64 character processed: impossible + *pfInvalid = true; + break; + + case 2: // 4n+2 base64 characters processed: require '==' + if (left || p[0] != '=' || p[1] != '=' || decode64_table[p[2]] != -1) + *pfInvalid = true; + break; + + case 3: // 4n+3 base64 characters processed: require '=' + if (left || p[0] != '=' || decode64_table[p[1]] != -1) + *pfInvalid = true; + break; + } + + return vchRet; +} + +string DecodeBase64(const string& str) +{ + vector<unsigned char> vchRet = DecodeBase64(str.c_str()); + return string((const char*)&vchRet[0], vchRet.size()); +} bool WildcardMatch(const char* psz, const char* mask) diff --git a/src/util.h b/src/util.h index 60e99431b1..f0b2f4a71c 100644 --- a/src/util.h +++ b/src/util.h @@ -178,6 +178,10 @@ bool ParseMoney(const std::string& str, int64& nRet); bool ParseMoney(const char* pszIn, int64& nRet); std::vector<unsigned char> ParseHex(const char* psz); std::vector<unsigned char> ParseHex(const std::string& str); +std::vector<unsigned char> DecodeBase64(const char* p, bool* pfInvalid = NULL); +std::string DecodeBase64(const std::string& str); +std::string EncodeBase64(const unsigned char* pch, size_t len); +std::string EncodeBase64(const std::string& str); void ParseParameters(int argc, char* argv[]); const char* wxGetTranslation(const char* psz); bool WildcardMatch(const char* psz, const char* mask); |