mirror of
https://github.com/jwinterm/myriadcoin.git
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Stealth addresses
This commit is contained in:
myriadcoin
@@ -0,0 +1,683 @@
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// Copyright (c) 2014 The ShadowCoin developers
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// Distributed under the MIT/X11 software license, see the accompanying
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// file license.txt or http://www.opensource.org/licenses/mit-license.php.
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#include "stealthaddress.h"
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#include "base58.h"
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#include <openssl/rand.h>
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#include <openssl/ec.h>
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#include <openssl/ecdsa.h>
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#include <openssl/obj_mac.h>
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//const uint8_t stealth_version_byte = 0x2a;
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const uint8_t stealth_version_byte = 0x28;
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bool CStealthAddress::SetEncoded(const std::string& encodedAddress)
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{
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data_chunk raw;
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if (!DecodeBase58(encodedAddress, raw))
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{
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if (fDebug)
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LogPrintf("CStealthAddress::SetEncoded DecodeBase58 falied.\n");
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return false;
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};
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if (!VerifyChecksum(raw))
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{
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if (fDebug)
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LogPrintf("CStealthAddress::SetEncoded verify_checksum falied.\n");
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return false;
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};
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if (raw.size() < 1 + 1 + 33 + 1 + 33 + 1 + 1 + 4)
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{
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if (fDebug)
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LogPrintf("CStealthAddress::SetEncoded() too few bytes provided.\n");
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return false;
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};
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uint8_t* p = &raw[0];
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uint8_t version = *p++;
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if (version != stealth_version_byte)
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{
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LogPrintf("CStealthAddress::SetEncoded version mismatch 0x%x != 0x%x.\n", version, stealth_version_byte);
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return false;
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};
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options = *p++;
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scan_pubkey.resize(33);
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memcpy(&scan_pubkey[0], p, 33);
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p += 33;
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//uint8_t spend_pubkeys = *p++;
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p++;
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spend_pubkey.resize(33);
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memcpy(&spend_pubkey[0], p, 33);
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return true;
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};
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std::string CStealthAddress::Encoded() const
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{
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// https://wiki.unsystem.net/index.php/DarkWallet/Stealth#Address_format
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// [version] [options] [scan_key] [N] ... [Nsigs] [prefix_length] ...
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data_chunk raw;
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raw.push_back(stealth_version_byte);
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raw.push_back(options);
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raw.insert(raw.end(), scan_pubkey.begin(), scan_pubkey.end());
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raw.push_back(1); // number of spend pubkeys
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raw.insert(raw.end(), spend_pubkey.begin(), spend_pubkey.end());
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raw.push_back(0); // number of signatures
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raw.push_back(0); // ?
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AppendChecksum(raw);
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return EncodeBase58(raw);
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};
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uint32_t BitcoinChecksum(uint8_t* p, uint32_t nBytes)
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{
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if (!p || nBytes == 0)
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return 0;
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uint8_t hash1[32];
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SHA256(p, nBytes, (uint8_t*)hash1);
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uint8_t hash2[32];
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SHA256((uint8_t*)hash1, sizeof(hash1), (uint8_t*)hash2);
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// -- checksum is the 1st 4 bytes of the hash
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uint32_t checksum = from_little_endian<uint32_t>(&hash2[0]);
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return checksum;
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};
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void AppendChecksum(data_chunk& data)
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{
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uint32_t checksum = BitcoinChecksum(&data[0], data.size());
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// -- to_little_endian
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std::vector<uint8_t> tmp(4);
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//memcpy(&tmp[0], &checksum, 4);
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for (int i = 0; i < 4; ++i)
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{
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tmp[i] = checksum & 0xFF;
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checksum >>= 8;
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};
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data.insert(data.end(), tmp.begin(), tmp.end());
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};
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bool VerifyChecksum(const data_chunk& data)
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{
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if (data.size() < 4)
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return false;
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uint32_t checksum = from_little_endian<uint32_t>(data.end() - 4);
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return BitcoinChecksum((uint8_t*)&data[0], data.size()-4) == checksum;
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};
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int GenerateRandomSecret(ec_secret& out)
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{
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RandAddSeedPerfmon();
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static uint256 max("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364140");
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static uint256 min(16000); // increase? min valid key is 1
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uint256 test;
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int i;
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// -- check max, try max 32 times
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for (i = 0; i < 32; ++i)
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{
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RAND_bytes((unsigned char*) test.begin(), 32);
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if (test > min && test < max)
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{
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memcpy(&out.e[0], test.begin(), 32);
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break;
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};
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};
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if (i > 31)
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{
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LogPrintf("Error: GenerateRandomSecret failed to generate a valid key.\n");
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return 1;
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};
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return 0;
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};
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int SecretToPublicKey(const ec_secret& secret, ec_point& out)
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{
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// -- public key = private * G
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int rv = 0;
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EC_GROUP *ecgrp = EC_GROUP_new_by_curve_name(NID_secp256k1);
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if (!ecgrp)
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{
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LogPrintf("SecretToPublicKey(): EC_GROUP_new_by_curve_name failed.\n");
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return 1;
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};
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BIGNUM* bnIn = BN_bin2bn(&secret.e[0], ec_secret_size, BN_new());
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if (!bnIn)
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{
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EC_GROUP_free(ecgrp);
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LogPrintf("SecretToPublicKey(): BN_bin2bn failed\n");
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return 1;
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};
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EC_POINT* pub = EC_POINT_new(ecgrp);
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EC_POINT_mul(ecgrp, pub, bnIn, NULL, NULL, NULL);
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BIGNUM* bnOut = EC_POINT_point2bn(ecgrp, pub, POINT_CONVERSION_COMPRESSED, BN_new(), NULL);
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if (!bnOut)
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{
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LogPrintf("SecretToPublicKey(): point2bn failed\n");
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rv = 1;
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} else
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{
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out.resize(ec_compressed_size);
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if (BN_num_bytes(bnOut) != (int) ec_compressed_size
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|| BN_bn2bin(bnOut, &out[0]) != (int) ec_compressed_size)
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{
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LogPrintf("SecretToPublicKey(): bnOut incorrect length.\n");
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rv = 1;
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};
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BN_free(bnOut);
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};
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EC_GROUP_free(ecgrp);
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BN_free(bnIn);
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EC_POINT_free(pub);
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return rv;
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};
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int StealthSecret(ec_secret& secret, ec_point& pubkey, const ec_point& pkSpend, ec_secret& sharedSOut, ec_point& pkOut)
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{
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/*
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send:
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secret = ephem_secret, pubkey = scan_pubkey
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receive:
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secret = scan_secret, pubkey = ephem_pubkey
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c = H(dP)
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Q = public scan key (EC point, 33 bytes)
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d = private scan key (integer, 32 bytes)
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R = public spend key
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f = private spend key
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Q = dG
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R = fG
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Sender (has Q and R, not d or f):
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P = eG
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c = H(eQ) = H(dP)
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R' = R + cG
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Recipient gets R' and P
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test 0 and infinity?
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*/
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int rv = 0;
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std::vector<uint8_t> vchOutQ;
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BN_CTX* bnCtx = NULL;
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BIGNUM* bnEphem = NULL;
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BIGNUM* bnQ = NULL;
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EC_POINT* Q = NULL;
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BIGNUM* bnOutQ = NULL;
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BIGNUM* bnc = NULL;
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EC_POINT* C = NULL;
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BIGNUM* bnR = NULL;
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EC_POINT* R = NULL;
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EC_POINT* Rout = NULL;
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BIGNUM* bnOutR = NULL;
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EC_GROUP* ecgrp = EC_GROUP_new_by_curve_name(NID_secp256k1);
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if (!ecgrp)
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{
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LogPrintf("StealthSecret(): EC_GROUP_new_by_curve_name failed.\n");
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return 1;
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};
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if (!(bnCtx = BN_CTX_new()))
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{
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LogPrintf("StealthSecret(): BN_CTX_new failed.\n");
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rv = 1;
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goto End;
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};
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if (!(bnEphem = BN_bin2bn(&secret.e[0], ec_secret_size, BN_new())))
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{
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LogPrintf("StealthSecret(): bnEphem BN_bin2bn failed.\n");
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rv = 1;
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goto End;
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};
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if (!(bnQ = BN_bin2bn(&pubkey[0], pubkey.size(), BN_new())))
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{
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LogPrintf("StealthSecret(): bnQ BN_bin2bn failed\n");
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rv = 1;
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goto End;
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};
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if (!(Q = EC_POINT_bn2point(ecgrp, bnQ, NULL, bnCtx)))
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{
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LogPrintf("StealthSecret(): Q EC_POINT_bn2point failed\n");
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rv = 1;
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goto End;
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};
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// -- eQ
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// EC_POINT_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *n, const EC_POINT *q, const BIGNUM *m, BN_CTX *ctx);
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// EC_POINT_mul calculates the value generator * n + q * m and stores the result in r. The value n may be NULL in which case the result is just q * m.
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if (!EC_POINT_mul(ecgrp, Q, NULL, Q, bnEphem, bnCtx))
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{
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LogPrintf("StealthSecret(): eQ EC_POINT_mul failed\n");
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rv = 1;
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goto End;
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};
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if (!(bnOutQ = EC_POINT_point2bn(ecgrp, Q, POINT_CONVERSION_COMPRESSED, BN_new(), bnCtx)))
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{
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LogPrintf("StealthSecret(): Q EC_POINT_bn2point failed\n");
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rv = 1;
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goto End;
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};
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vchOutQ.resize(ec_compressed_size);
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if (BN_num_bytes(bnOutQ) != (int) ec_compressed_size
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|| BN_bn2bin(bnOutQ, &vchOutQ[0]) != (int) ec_compressed_size)
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{
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LogPrintf("StealthSecret(): bnOutQ incorrect length.\n");
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rv = 1;
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goto End;
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};
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SHA256(&vchOutQ[0], vchOutQ.size(), &sharedSOut.e[0]);
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if (!(bnc = BN_bin2bn(&sharedSOut.e[0], ec_secret_size, BN_new())))
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{
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LogPrintf("StealthSecret(): BN_bin2bn failed\n");
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rv = 1;
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goto End;
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};
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// -- cG
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if (!(C = EC_POINT_new(ecgrp)))
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{
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LogPrintf("StealthSecret(): C EC_POINT_new failed\n");
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rv = 1;
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goto End;
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};
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if (!EC_POINT_mul(ecgrp, C, bnc, NULL, NULL, bnCtx))
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{
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LogPrintf("StealthSecret(): C EC_POINT_mul failed\n");
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rv = 1;
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goto End;
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};
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if (!(bnR = BN_bin2bn(&pkSpend[0], pkSpend.size(), BN_new())))
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||||
{
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LogPrintf("StealthSecret(): bnR BN_bin2bn failed\n");
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rv = 1;
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||||
goto End;
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};
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||||
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if (!(R = EC_POINT_bn2point(ecgrp, bnR, NULL, bnCtx)))
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{
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LogPrintf("StealthSecret(): R EC_POINT_bn2point failed\n");
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rv = 1;
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goto End;
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};
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if (!EC_POINT_mul(ecgrp, C, bnc, NULL, NULL, bnCtx))
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{
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LogPrintf("StealthSecret(): C EC_POINT_mul failed\n");
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rv = 1;
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goto End;
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};
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if (!(Rout = EC_POINT_new(ecgrp)))
|
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{
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LogPrintf("StealthSecret(): Rout EC_POINT_new failed\n");
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rv = 1;
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goto End;
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};
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if (!EC_POINT_add(ecgrp, Rout, R, C, bnCtx))
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{
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LogPrintf("StealthSecret(): Rout EC_POINT_add failed\n");
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rv = 1;
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goto End;
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||||
};
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||||
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if (!(bnOutR = EC_POINT_point2bn(ecgrp, Rout, POINT_CONVERSION_COMPRESSED, BN_new(), bnCtx)))
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||||
{
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LogPrintf("StealthSecret(): Rout EC_POINT_bn2point failed\n");
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rv = 1;
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goto End;
|
||||
};
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||||
|
||||
|
||||
pkOut.resize(ec_compressed_size);
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||||
if (BN_num_bytes(bnOutR) != (int) ec_compressed_size
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||||
|| BN_bn2bin(bnOutR, &pkOut[0]) != (int) ec_compressed_size)
|
||||
{
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||||
LogPrintf("StealthSecret(): pkOut incorrect length.\n");
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||||
rv = 1;
|
||||
goto End;
|
||||
};
|
||||
|
||||
End:
|
||||
if (bnOutR) BN_free(bnOutR);
|
||||
if (Rout) EC_POINT_free(Rout);
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||||
if (R) EC_POINT_free(R);
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||||
if (bnR) BN_free(bnR);
|
||||
if (C) EC_POINT_free(C);
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||||
if (bnc) BN_free(bnc);
|
||||
if (bnOutQ) BN_free(bnOutQ);
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||||
if (Q) EC_POINT_free(Q);
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||||
if (bnQ) BN_free(bnQ);
|
||||
if (bnEphem) BN_free(bnEphem);
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||||
if (bnCtx) BN_CTX_free(bnCtx);
|
||||
EC_GROUP_free(ecgrp);
|
||||
|
||||
return rv;
|
||||
};
|
||||
|
||||
|
||||
int StealthSecretSpend(ec_secret& scanSecret, ec_point& ephemPubkey, ec_secret& spendSecret, ec_secret& secretOut)
|
||||
{
|
||||
/*
|
||||
|
||||
c = H(dP)
|
||||
R' = R + cG [without decrypting wallet]
|
||||
= (f + c)G [after decryption of wallet]
|
||||
Remember: mod curve.order, pad with 0x00s where necessary?
|
||||
*/
|
||||
|
||||
int rv = 0;
|
||||
std::vector<uint8_t> vchOutP;
|
||||
|
||||
BN_CTX* bnCtx = NULL;
|
||||
BIGNUM* bnScanSecret = NULL;
|
||||
BIGNUM* bnP = NULL;
|
||||
EC_POINT* P = NULL;
|
||||
BIGNUM* bnOutP = NULL;
|
||||
BIGNUM* bnc = NULL;
|
||||
BIGNUM* bnOrder = NULL;
|
||||
BIGNUM* bnSpend = NULL;
|
||||
|
||||
EC_GROUP* ecgrp = EC_GROUP_new_by_curve_name(NID_secp256k1);
|
||||
|
||||
if (!ecgrp)
|
||||
{
|
||||
LogPrintf("StealthSecretSpend(): EC_GROUP_new_by_curve_name failed.\n");
|
||||
return 1;
|
||||
};
|
||||
|
||||
if (!(bnCtx = BN_CTX_new()))
|
||||
{
|
||||
LogPrintf("StealthSecretSpend(): BN_CTX_new failed.\n");
|
||||
rv = 1;
|
||||
goto End;
|
||||
};
|
||||
|
||||
if (!(bnScanSecret = BN_bin2bn(&scanSecret.e[0], ec_secret_size, BN_new())))
|
||||
{
|
||||
LogPrintf("StealthSecretSpend(): bnScanSecret BN_bin2bn failed.\n");
|
||||
rv = 1;
|
||||
goto End;
|
||||
};
|
||||
|
||||
if (!(bnP = BN_bin2bn(&ephemPubkey[0], ephemPubkey.size(), BN_new())))
|
||||
{
|
||||
LogPrintf("StealthSecretSpend(): bnP BN_bin2bn failed\n");
|
||||
rv = 1;
|
||||
goto End;
|
||||
};
|
||||
|
||||
if (!(P = EC_POINT_bn2point(ecgrp, bnP, NULL, bnCtx)))
|
||||
{
|
||||
LogPrintf("StealthSecretSpend(): P EC_POINT_bn2point failed\n");
|
||||
rv = 1;
|
||||
goto End;
|
||||
};
|
||||
|
||||
// -- dP
|
||||
if (!EC_POINT_mul(ecgrp, P, NULL, P, bnScanSecret, bnCtx))
|
||||
{
|
||||
LogPrintf("StealthSecretSpend(): dP EC_POINT_mul failed\n");
|
||||
rv = 1;
|
||||
goto End;
|
||||
};
|
||||
|
||||
if (!(bnOutP = EC_POINT_point2bn(ecgrp, P, POINT_CONVERSION_COMPRESSED, BN_new(), bnCtx)))
|
||||
{
|
||||
LogPrintf("StealthSecretSpend(): P EC_POINT_bn2point failed\n");
|
||||
rv = 1;
|
||||
goto End;
|
||||
};
|
||||
|
||||
|
||||
vchOutP.resize(ec_compressed_size);
|
||||
if (BN_num_bytes(bnOutP) != (int) ec_compressed_size
|
||||
|| BN_bn2bin(bnOutP, &vchOutP[0]) != (int) ec_compressed_size)
|
||||
{
|
||||
LogPrintf("StealthSecretSpend(): bnOutP incorrect length.\n");
|
||||
rv = 1;
|
||||
goto End;
|
||||
};
|
||||
|
||||
uint8_t hash1[32];
|
||||
SHA256(&vchOutP[0], vchOutP.size(), (uint8_t*)hash1);
|
||||
|
||||
|
||||
if (!(bnc = BN_bin2bn(&hash1[0], 32, BN_new())))
|
||||
{
|
||||
LogPrintf("StealthSecretSpend(): BN_bin2bn failed\n");
|
||||
rv = 1;
|
||||
goto End;
|
||||
};
|
||||
|
||||
if (!(bnOrder = BN_new())
|
||||
|| !EC_GROUP_get_order(ecgrp, bnOrder, bnCtx))
|
||||
{
|
||||
LogPrintf("StealthSecretSpend(): EC_GROUP_get_order failed\n");
|
||||
rv = 1;
|
||||
goto End;
|
||||
};
|
||||
|
||||
if (!(bnSpend = BN_bin2bn(&spendSecret.e[0], ec_secret_size, BN_new())))
|
||||
{
|
||||
LogPrintf("StealthSecretSpend(): bnSpend BN_bin2bn failed.\n");
|
||||
rv = 1;
|
||||
goto End;
|
||||
};
|
||||
|
||||
//if (!BN_add(r, a, b)) return 0;
|
||||
//return BN_nnmod(r, r, m, ctx);
|
||||
if (!BN_mod_add(bnSpend, bnSpend, bnc, bnOrder, bnCtx))
|
||||
{
|
||||
LogPrintf("StealthSecretSpend(): bnSpend BN_mod_add failed.\n");
|
||||
rv = 1;
|
||||
goto End;
|
||||
};
|
||||
|
||||
if (BN_is_zero(bnSpend)) // possible?
|
||||
{
|
||||
LogPrintf("StealthSecretSpend(): bnSpend is zero.\n");
|
||||
rv = 1;
|
||||
goto End;
|
||||
};
|
||||
|
||||
if (BN_num_bytes(bnSpend) != (int) ec_secret_size
|
||||
|| BN_bn2bin(bnSpend, &secretOut.e[0]) != (int) ec_secret_size)
|
||||
{
|
||||
LogPrintf("StealthSecretSpend(): bnSpend incorrect length.\n");
|
||||
rv = 1;
|
||||
goto End;
|
||||
};
|
||||
|
||||
End:
|
||||
if (bnSpend) BN_free(bnSpend);
|
||||
if (bnOrder) BN_free(bnOrder);
|
||||
if (bnc) BN_free(bnc);
|
||||
if (bnOutP) BN_free(bnOutP);
|
||||
if (P) EC_POINT_free(P);
|
||||
if (bnP) BN_free(bnP);
|
||||
if (bnScanSecret) BN_free(bnScanSecret);
|
||||
if (bnCtx) BN_CTX_free(bnCtx);
|
||||
EC_GROUP_free(ecgrp);
|
||||
|
||||
return rv;
|
||||
};
|
||||
|
||||
|
||||
int StealthSharedToSecretSpend(ec_secret& sharedS, ec_secret& spendSecret, ec_secret& secretOut)
|
||||
{
|
||||
|
||||
int rv = 0;
|
||||
std::vector<uint8_t> vchOutP;
|
||||
|
||||
BN_CTX* bnCtx = NULL;
|
||||
BIGNUM* bnc = NULL;
|
||||
BIGNUM* bnOrder = NULL;
|
||||
BIGNUM* bnSpend = NULL;
|
||||
|
||||
EC_GROUP* ecgrp = EC_GROUP_new_by_curve_name(NID_secp256k1);
|
||||
|
||||
if (!ecgrp)
|
||||
{
|
||||
LogPrintf("StealthSecretSpend(): EC_GROUP_new_by_curve_name failed.\n");
|
||||
return 1;
|
||||
};
|
||||
|
||||
if (!(bnCtx = BN_CTX_new()))
|
||||
{
|
||||
LogPrintf("StealthSecretSpend(): BN_CTX_new failed.\n");
|
||||
rv = 1;
|
||||
goto End;
|
||||
};
|
||||
|
||||
if (!(bnc = BN_bin2bn(&sharedS.e[0], ec_secret_size, BN_new())))
|
||||
{
|
||||
LogPrintf("StealthSecretSpend(): BN_bin2bn failed\n");
|
||||
rv = 1;
|
||||
goto End;
|
||||
};
|
||||
|
||||
if (!(bnOrder = BN_new())
|
||||
|| !EC_GROUP_get_order(ecgrp, bnOrder, bnCtx))
|
||||
{
|
||||
LogPrintf("StealthSecretSpend(): EC_GROUP_get_order failed\n");
|
||||
rv = 1;
|
||||
goto End;
|
||||
};
|
||||
|
||||
if (!(bnSpend = BN_bin2bn(&spendSecret.e[0], ec_secret_size, BN_new())))
|
||||
{
|
||||
LogPrintf("StealthSecretSpend(): bnSpend BN_bin2bn failed.\n");
|
||||
rv = 1;
|
||||
goto End;
|
||||
};
|
||||
|
||||
//if (!BN_add(r, a, b)) return 0;
|
||||
//return BN_nnmod(r, r, m, ctx);
|
||||
if (!BN_mod_add(bnSpend, bnSpend, bnc, bnOrder, bnCtx))
|
||||
{
|
||||
LogPrintf("StealthSecretSpend(): bnSpend BN_mod_add failed.\n");
|
||||
rv = 1;
|
||||
goto End;
|
||||
};
|
||||
|
||||
if (BN_is_zero(bnSpend)) // possible?
|
||||
{
|
||||
LogPrintf("StealthSecretSpend(): bnSpend is zero.\n");
|
||||
rv = 1;
|
||||
goto End;
|
||||
};
|
||||
|
||||
if (BN_num_bytes(bnSpend) != (int) ec_secret_size
|
||||
|| BN_bn2bin(bnSpend, &secretOut.e[0]) != (int) ec_secret_size)
|
||||
{
|
||||
LogPrintf("StealthSecretSpend(): bnSpend incorrect length.\n");
|
||||
rv = 1;
|
||||
goto End;
|
||||
};
|
||||
|
||||
End:
|
||||
if (bnSpend) BN_free(bnSpend);
|
||||
if (bnOrder) BN_free(bnOrder);
|
||||
if (bnc) BN_free(bnc);
|
||||
if (bnCtx) BN_CTX_free(bnCtx);
|
||||
EC_GROUP_free(ecgrp);
|
||||
|
||||
return rv;
|
||||
};
|
||||
|
||||
bool IsStealthAddress(const std::string& encodedAddress)
|
||||
{
|
||||
data_chunk raw;
|
||||
|
||||
if (!DecodeBase58(encodedAddress, raw))
|
||||
{
|
||||
LogPrintf("IsStealthAddress DecodeBase58 falied.\n");
|
||||
return false;
|
||||
};
|
||||
|
||||
if (!VerifyChecksum(raw))
|
||||
{
|
||||
LogPrintf("IsStealthAddress verify_checksum falied.\n");
|
||||
return false;
|
||||
};
|
||||
|
||||
if (raw.size() < 1 + 1 + 33 + 1 + 33 + 1 + 1 + 4)
|
||||
{
|
||||
LogPrintf("IsStealthAddress too few bytes provided.\n");
|
||||
return false;
|
||||
};
|
||||
|
||||
|
||||
uint8_t* p = &raw[0];
|
||||
uint8_t version = *p++;
|
||||
|
||||
if (version != stealth_version_byte)
|
||||
{
|
||||
LogPrintf("IsStealthAddress version mismatch 0x%x != 0x%x.\n", version, stealth_version_byte);
|
||||
return false;
|
||||
};
|
||||
|
||||
return true;
|
||||
};
|
||||
Reference in New Issue
Block a user