/// <summary>
/// Constructor which attempts to redeem a completed set of three codes, and calculate the private key.
/// </summary>
public EscrowCodeSet(string code1, string code2, string code3)
{
if (code1 == null || code2 == null || code3 == null || code1 == "" || code2 == "" || code3 == "") {
throw new ArgumentException("Three codes are required to use this function.");
}
string codea = null, codeb=null, codep = null;
if (code1.StartsWith("einva")) codea = code1;
if (code2.StartsWith("einva")) codea = code2;
if (code3.StartsWith("einva")) codea = code3;
if (code1.StartsWith("einvb")) codeb = code1;
if (code2.StartsWith("einvb")) codeb = code2;
if (code3.StartsWith("einvb")) codeb = code3;
if (code1.StartsWith("einvp")) codep = code1;
if (code2.StartsWith("einvp")) codep = code2;
if (code3.StartsWith("einvp")) codep = code3;
if (codea==null || codeb == null || codep == null) {
throw new ArgumentException("In order to use this function, one code MUST be an Escrow Invitation A (starting " +
"with \"einva\"), one must be an Escrow Invitation B (starting with \"einvb\") and the last " +
"code MUST be a Payment Invitation (starting with \"einvp\").");
}
byte[] pubparta, privparta;
int identifier30a;
string failreason = parseEscrowCode(codea, out pubparta, out privparta, out identifier30a);
if (failreason != null) throw new ArgumentException("Escrow Invitation Code A: " + failreason);
byte[] pubpartb, privpartb;
int identifier30b;
failreason = parseEscrowCode(codeb, out pubpartb, out privpartb, out identifier30b);
if (failreason != null) throw new ArgumentException("Escrow Invitation Code B: " + failreason);
if (identifier30a != identifier30b) {
throw new ArgumentException("The two Escrow Invitations are not mates and cannot unlock the private key.");
}
string notvalid = "Not a valid Payment Invitation Code";
string notvalid2 = "Code is not a valid Payment Invitation Code or may have a typo or other error.";
string notvalid3 = "The Payment Invitation does not belong to the provided Escrow Invitation.";
long headp;
byte[] invbytesp;
string failReason = parseEitherCode(codep, notvalid, notvalid2, out invbytesp, out headp);
if (headp < headbaseP) throw new ArgumentException(notvalid);
long identifier30L = headp - headbaseP;
if (identifier30L < 0 || identifier30L > 0x3FFFFFFFL) throw new ArgumentException(notvalid);
if (identifier30L != (long)identifier30a) {
throw new ArgumentException("The Payment Invitation was not generated from either of the provided Escrow Invitation codes and cannot be unlocked by them.");
}
byte[] privpartz = new byte[32];
Array.Copy(invbytesp, 8 + 1 + 1, privpartz, 0, 32);
byte networkByte = invbytesp[8];
bool compressedFlag = (invbytesp[8 + 1 + 1 + 32 + 20] & 0x1) == 1;
// get private key
BigInteger xyz = new BigInteger(1, privparta).Multiply(new BigInteger(1, privpartb)).Multiply(new BigInteger(1, privpartz));
var ps = Org.BouncyCastle.Asn1.Sec.SecNamedCurves.GetByName("secp256k1");
xyz = xyz.Mod(ps.N);
KeyPair kp = new KeyPair(xyz, compressedFlag, networkByte);
// provide everything
this.EscrowInvitationCodeA = codea;
this.EscrowInvitationCodeB = codeb;
this.PaymentInvitationCode = codep;
this.BitcoinAddress = kp.AddressBase58;
this.PrivateKey = kp.PrivateKey;
}
/// <summary> Decrypts./ </summary>
///
/// auto secret = priv.get_shared_secret(pub);
/// auto nonce_plus_secret = fc::sha512::hash(fc::to_string(nonce) + secret.str());
/// auto plain_text = fc::aes_decrypt( nonce_plus_secret, message );
/// auto result = memo_message::deserialize(string(plain_text.begin(), plain_text.end()));
/// FC_ASSERT( result.checksum == uint32_t(digest_type::hash(result.text)._hash[0]) );
/// return result.text;
///
/// <remarks> Paul, 26/10/2015. </remarks>
///
/// <param name="memo"> The memo. </param>
/// <param name="receiverPrivateKey"> The receiver private key. </param>
/// <param name="senderPublicKey"> The sender public key. </param>
///
/// <returns> A string. </returns>
public static string Decrypt(GrapheneMemo memo, KeyPair receiverKeyPair)
{
PublicKey pub = new BitsharesPubKey(memo.from).GetBitcoinPubKey();
byte[] sharedSecret = GetSharedSecret(receiverKeyPair, pub);
string ss = StringExtensions.ByteArrayToHexString(sharedSecret, true);
string ps = memo.nonce.ToString() + StringExtensions.ByteArrayToHexString(Crypto.ComputeSha512( sharedSecret), true);
byte[] seed = ASCIIEncoding.ASCII.GetBytes(ps);
string hex = StringExtensions.ByteArrayToHexString(Crypto.ComputeSha512(seed), true);
string key = hex.Substring(0, 64);
string iv = hex.Substring(64, 32);
byte[] data = Util.HexStringToBytes(memo.message);
int len = AES.AesDecrypt(data, Util.HexStringToBytes(key), Util.HexStringToBytes(iv));
byte[] result = new byte[len - 4];
Buffer.BlockCopy(data, 4, result, 0, result.Length);
string message = UTF8Encoding.UTF8.GetString(result);
return message;
}
/// <summary>
/// Default constructor. Creates a new matched pair of escrow invitation codes.
/// </summary>
public EscrowCodeSet()
{
SecureRandom sr = new SecureRandom();
byte[] x = new byte[32];
byte[] y = new byte[32];
sr.NextBytes(x);
sr.NextBytes(y);
// Force x to be even
// Force y to be odd
x[31] &= 0xFE;
y[31] |= 0x01;
KeyPair kx = new KeyPair(x, true);
KeyPair ky = new KeyPair(y, true);
BigInteger xi = new BigInteger(1, x);
BigInteger yi = new BigInteger(1, y);
ECPoint Gx = kx.GetECPoint();
byte[] bytesGx = Gx.GetEncoded();
ECPoint Gy = ky.GetECPoint();
byte[] bytesGy = Gy.GetEncoded();
ECPoint Gxy = Gx.Multiply(yi);
byte[] bytesGxy = Gxy.GetEncoded();
Sha256Digest sha256 = new Sha256Digest();
byte[] hashGxy = new byte[32];
sha256.BlockUpdate(bytesGxy, 0, bytesGxy.Length);
sha256.DoFinal(hashGxy, 0);
sha256.BlockUpdate(hashGxy, 0, 32);
sha256.DoFinal(hashGxy, 0);
int identifier30 = ((hashGxy[0] & 0x3f) << 24) + (hashGxy[1] << 16) + (hashGxy[2] << 8) + hashGxy[3];
byte[] invitationA = new byte[74];
byte[] invitationB = new byte[74];
long headA = headbaseA + (long)identifier30;
long headB = headbaseB + (long)identifier30;
// turn headA and headB into bytes
for (int i = 7; i >= 0; i--) {
invitationA[i] = (byte)(headA & 0xFF);
invitationB[i] = (byte)(headB & 0xFF);
headA >>= 8;
headB >>= 8;
}
Array.Copy(x, 0, invitationA, 8 + 1, 32);
Array.Copy(y, 0, invitationB, 8 + 1, 32);
Array.Copy(bytesGy, 0, invitationA, 8 + 1 + 32, 33);
Array.Copy(bytesGx, 0, invitationB, 8 + 1 + 32, 33);
EscrowInvitationCodeA = Util.ByteArrayToBase58Check(invitationA);
EscrowInvitationCodeB = Util.ByteArrayToBase58Check(invitationB);
}
/// <summary>
/// Encryption constructor (non-EC-multiply)
/// </summary>
public Bip38KeyPair(KeyPair key, string passphrase)
{
if (passphrase == null && passphrase == "") {
throw new ArgumentException("Passphrase is required");
}
if (key == null) throw new ArgumentException("Passphrase is required");
this.IsCompressedPoint = key.IsCompressedPoint;
this._addressType = key.AddressType;
UTF8Encoding utf8 = new UTF8Encoding(false);
byte[] addrhashfull = Util.ComputeDoubleSha256(key.AddressBase58);
byte[] addresshash = new byte[] { addrhashfull[0], addrhashfull[1], addrhashfull[2], addrhashfull[3] };
byte[] derivedBytes = new byte[64];
SCrypt.ComputeKey(utf8.GetBytes(passphrase), addresshash, 16384, 8, 8, 8, derivedBytes);
var aes = Aes.Create();
aes.KeySize = 256;
aes.Mode = CipherMode.ECB;
byte[] aeskey = new byte[32];
Array.Copy(derivedBytes, 32, aeskey, 0, 32);
aes.Key = aeskey;
ICryptoTransform encryptor = aes.CreateEncryptor();
byte[] unencrypted = new byte[32];
byte[] rv = new byte[39];
Array.Copy(key.PrivateKeyBytes, unencrypted, 32);
for (int x = 0; x < 32; x++) unencrypted[x] ^= derivedBytes[x];
encryptor.TransformBlock(unencrypted, 0, 16, rv, 7);
encryptor.TransformBlock(unencrypted, 0, 16, rv, 7);
encryptor.TransformBlock(unencrypted, 16, 16, rv, 23);
encryptor.TransformBlock(unencrypted, 16, 16, rv, 23);
// put header
rv[0] = 0x01;
rv[1] = 0x42;
rv[2] = IsCompressedPoint ? (byte)0xe0 : (byte)0xc0;
byte[] checksum = Util.ComputeDoubleSha256(utf8.GetBytes(key.AddressBase58));
rv[3] = checksum[0];
rv[4] = checksum[1];
rv[5] = checksum[2];
rv[6] = checksum[3];
_encryptedKey = Util.ByteArrayToBase58Check(rv);
_pubKey = key.PublicKeyBytes;
_hash160 = key.Hash160;
}
/// <summary>
/// Encrypt constructor.
/// Creates a new encrypted key pair with a passphrase.
/// The resulting key pair record retains the public key and bitcoin address
/// but not the passphrase or the unencrypted private key.
/// </summary>
public ShaPassphraseKeyPair(KeyPair key, string passphrase)
{
if (passphrase == null || passphrase == "") {
throw new ArgumentException("Passphrase is required");
}
if (key == null) throw new ArgumentException("Key is required");
IsCompressedPoint = key.IsCompressedPoint;
_addressType = key.AddressType;
this._hash160 = key.Hash160;
this._pubKey = key.PublicKeyBytes;
var aes = Aes.Create();
aes.KeySize = 256;
aes.Mode = CipherMode.ECB;
byte[] encryptionKey = Util.ComputeSha256(passphrase);
aes.Key = encryptionKey;
ICryptoTransform encryptor = aes.CreateEncryptor();
byte[] rv = new byte[36];
encryptor.TransformBlock(_privKey, 0, 16, rv, 4);
encryptor.TransformBlock(_privKey, 0, 16, rv, 4);
byte[] interblock = new byte[16];
Array.Copy(rv, 4, interblock, 0, 16);
for (int x = 0; x < 16; x++) interblock[x] ^= _privKey[16 + x];
encryptor.TransformBlock(interblock, 0, 16, rv, 20);
encryptor.TransformBlock(interblock, 0, 16, rv, 20);
// put header
rv[0] = 0x02;
rv[1] = 0x05;
byte[] checksum = Util.ComputeSha256(passphrase + "?");
rv[2] = (byte)(checksum[0] & 0x7F);
rv[3] = (byte)(checksum[1] & 0xFE);
if (key.IsCompressedPoint) rv[3]++;
this._encryptedKey = Util.ByteArrayToBase58Check(rv);
}
/// <summary> Gets shared secret. </summary>
///
/// def get_shared_secret(priv, pub) :
/// pub_point = pub.point()
/// priv_point = int(repr(priv),16)
/// res = pub_point * priv_point
/// res_hex = '%032x' % res.x()
/// return res_hex
///
/// <remarks> Paul, 26/10/2015. </remarks>
///
/// <returns> The shared secret. </returns>
public static byte[] GetSharedSecret(KeyPair priv, PublicKey pub)
{
var ps = SecNamedCurves.GetByName("secp256k1");
BigInteger ipriv = new BigInteger(1, priv.PrivateKeyBytes);
ECPoint pubPoint = pub.GetECPoint();
ECPoint shared = pubPoint.Multiply(ipriv);
BigInteger s = shared.X.ToBigInteger();
byte[] data = s.ToByteArray();
int leadingZeros=-1;
while(data[++leadingZeros] == 0);
byte[] result = new byte[data.Length - leadingZeros];
Buffer.BlockCopy(data, leadingZeros, result, 0, result.Length);
return result;
}
private void computeCode()
{
// make a compressed key out of it just by using the existing bitcoin address classes
KeyPair kp = new KeyPair(_passfactor, compressed: true);
_passpoint = kp.PublicKeyBytes;
byte[] result = new byte[49];
// 8 bytes are a constant, responsible for making the result start with the characters "passphrase"
Array.Copy(magic, 0, result, 0, 8);
result[7] = (byte)(LotSequencePresent ? 0x51 : 0x53);
Array.Copy(_ownerentropy, 0, result, 8, 8);
Array.Copy(_passpoint, 0, result, 16, 33);
Code = Util.ByteArrayToBase58Check(result);
}
/// <summary>
/// A string that allows someone to independently calculate the
/// bitcoin address given their key material, without divulging the encrypted private key.
/// This can be used to prove that the bitcoin address is encumbered by the passphrase.
/// This is null if unavailable or not applicable. When available, calculates upon first
/// read, which involves an EC multiply and takes a little bit of CPU time.
/// </summary>
public string GetConfirmationCode()
{
if (_confirmationCode != null) return _confirmationCode;
if (confirmationCodeInfo == null || factorb == null) return null;
// finish calculating the confirmation code
// use the KeyPair class to do the EC multiply for us
KeyPair kp = new KeyPair(new BigInteger(1, factorb), true);
// the public key is 33 bytes, or rather, 32 bytes plus one bit
// (the first byte is either 0x02 or 0x03).
// xor it with one bit of derived so it's not readable from the confirmation code.
byte[] kppubbytes = kp.PublicKeyBytes;
confirmationCodeInfo[18] = (byte)(kppubbytes[0] ^ (derived[63] & 0x01));
// xor the pub bytes with derived[0...31] to get similar benefit like having an IV
byte[] unencrypted = new byte[32];
for (int i = 0; i < 32; i++) unencrypted[i] = (byte)(kppubbytes[i + 1] ^ derived[i]);
// prepare for AES encryption
byte[] derivedhalf2 = new byte[32];
Array.Copy(derived, 32, derivedhalf2, 0, 32);
var aes = Aes.Create();
aes.KeySize = 256;
aes.Mode = CipherMode.ECB;
aes.Key = derivedhalf2;
ICryptoTransform encryptor = aes.CreateEncryptor();
// encrypt remaining two blocks of 16 bytes using same derived key
encryptor.TransformBlock(unencrypted, 0, 16, confirmationCodeInfo, 19);
encryptor.TransformBlock(unencrypted, 0, 16, confirmationCodeInfo, 19);
encryptor.TransformBlock(unencrypted, 16, 16, confirmationCodeInfo, 19+16);
encryptor.TransformBlock(unencrypted, 16, 16, confirmationCodeInfo, 19+16);
_confirmationCode = Util.ByteArrayToBase58Check(confirmationCodeInfo);
return _confirmationCode;
}
public override bool DecryptWithPassphrase(string passphrase)
{
if (passphrase == null) {
return false;
}
byte[] hex = Util.Base58CheckToByteArray(_encryptedKey);
KeyPair tempkey = null;
if (hex.Length == 39 && hex[0] == 1 && hex[1] == 0x42) {
UTF8Encoding utf8 = new UTF8Encoding(false);
byte[] addresshash = new byte[] { hex[3], hex[4], hex[5], hex[6] };
byte[] derivedBytes = new byte[64];
SCrypt.ComputeKey(utf8.GetBytes(passphrase), addresshash, 16384, 8, 8, 8, derivedBytes);
var aes = Aes.Create();
aes.KeySize = 256;
aes.Mode = CipherMode.ECB;
byte[] aeskey = new byte[32];
Array.Copy(derivedBytes, 32, aeskey, 0, 32);
aes.Key = aeskey;
ICryptoTransform decryptor = aes.CreateDecryptor();
byte[] decrypted = new byte[32];
decryptor.TransformBlock(hex, 7, 16, decrypted, 0);
decryptor.TransformBlock(hex, 7, 16, decrypted, 0);
decryptor.TransformBlock(hex, 23, 16, decrypted, 16);
decryptor.TransformBlock(hex, 23, 16, decrypted, 16);
for (int x = 0; x < 32; x++) decrypted[x] ^= derivedBytes[x];
tempkey = new KeyPair(decrypted, compressed: IsCompressedPoint);
Sha256Digest sha256 = new Sha256Digest();
byte[] addrhash = new byte[32];
byte[] addrtext = utf8.GetBytes(tempkey.AddressBase58);
sha256.BlockUpdate(addrtext, 0, addrtext.Length);
sha256.DoFinal(addrhash, 0);
sha256.BlockUpdate(addrhash, 0, 32);
sha256.DoFinal(addrhash, 0);
if (addrhash[0] != hex[3] || addrhash[1] != hex[4] || addrhash[2] != hex[5] || addrhash[3] != hex[6]) {
return false;
}
_privKey = tempkey.PrivateKeyBytes;
_pubKey = tempkey.PublicKeyBytes;
_hash160 = tempkey.Hash160;
return true;
} else if (hex.Length == 39 && hex[0] == 1 && hex[1] == 0x43) {
// produce the intermediate from the passphrase
// get ownersalt and encryptedpart2 since they are in the record
byte[] ownersalt = new byte[8];
Array.Copy(hex, 7, ownersalt, 0, 8);
bool includeHashStep = (hex[2] & 4) == 4;
Bip38Intermediate intermediate = new Bip38Intermediate(passphrase, ownersalt, includeHashStep);
this.LotNumber = intermediate.LotNumber;
this.SequenceNumber = intermediate.SequenceNumber;
tempkey = decryptUsingIntermediate(intermediate, hex);
if (verifyAddressHash(tempkey.AddressBase58, hex) == false) return false;
}
_privKey = tempkey.PrivateKeyBytes;
_pubKey = tempkey.PublicKeyBytes;
_hash160 = tempkey.Hash160;
return true;
}
/// <summary>
/// Encryption constructor to create a new random key from an intermediate
/// </summary>
public Bip38KeyPair(Bip38Intermediate intermediate, bool retainPrivateKeyWhenPossible=false)
{
// generate seedb
byte[] seedb = new byte[24];
SecureRandom sr = new SecureRandom();
sr.NextBytes(seedb);
// get factorb as sha256(sha256(seedb))
Sha256Digest sha256 = new Sha256Digest();
sha256.BlockUpdate(seedb, 0, 24);
factorb = new byte[32];
sha256.DoFinal(factorb, 0);
sha256.BlockUpdate(factorb, 0, 32);
sha256.DoFinal(factorb, 0);
// get ECPoint from passpoint
PublicKey pk = new PublicKey(intermediate.passpoint);
ECPoint generatedpoint = pk.GetECPoint().Multiply(new BigInteger(1, factorb));
byte[] generatedpointbytes = generatedpoint.GetEncoded();
PublicKey generatedaddress = new PublicKey(generatedpointbytes);
// get addresshash
UTF8Encoding utf8 = new UTF8Encoding(false);
byte[] generatedaddressbytes = utf8.GetBytes(generatedaddress.AddressBase58);
sha256.BlockUpdate(generatedaddressbytes, 0, generatedaddressbytes.Length);
byte[] addresshashfull = new byte[32];
sha256.DoFinal(addresshashfull, 0);
sha256.BlockUpdate(addresshashfull, 0, 32);
sha256.DoFinal(addresshashfull, 0);
byte[] addresshashplusownerentropy = new byte[12];
Array.Copy(addresshashfull, 0, addresshashplusownerentropy, 0, 4);
Array.Copy(intermediate.ownerentropy, 0, addresshashplusownerentropy, 4, 8);
// derive encryption key material
derived = new byte[64];
SCrypt.ComputeKey(intermediate.passpoint, addresshashplusownerentropy, 1024, 1, 1, 1, derived);
byte[] derivedhalf2 = new byte[32];
Array.Copy(derived, 32, derivedhalf2, 0, 32);
byte[] unencryptedpart1 = new byte[16];
for (int i = 0; i < 16; i++) {
unencryptedpart1[i] = (byte)(seedb[i] ^ derived[i]);
}
byte[] encryptedpart1 = new byte[16];
// encrypt it
var aes = Aes.Create();
aes.KeySize = 256;
aes.Mode = CipherMode.ECB;
aes.Key = derivedhalf2;
ICryptoTransform encryptor = aes.CreateEncryptor();
encryptor.TransformBlock(unencryptedpart1, 0, 16, encryptedpart1, 0);
encryptor.TransformBlock(unencryptedpart1, 0, 16, encryptedpart1, 0);
byte[] unencryptedpart2 = new byte[16];
for (int i = 0; i < 8; i++) {
unencryptedpart2[i] = (byte)(encryptedpart1[i + 8] ^ derived[i + 16]);
}
for (int i = 0; i < 8; i++) {
unencryptedpart2[i + 8] = (byte)(seedb[i + 16] ^ derived[i + 24]);
}
byte[] encryptedpart2 = new byte[16];
encryptor.TransformBlock(unencryptedpart2, 0, 16, encryptedpart2, 0);
encryptor.TransformBlock(unencryptedpart2, 0, 16, encryptedpart2, 0);
byte[] result = new byte[39];
result[0] = 0x01;
result[1] = 0x43;
result[2] = generatedaddress.IsCompressedPoint ? (byte)0x20 : (byte)0x00;
if (intermediate.LotSequencePresent) result[2] |= 0x04;
Array.Copy(addresshashfull, 0, result, 3, 4);
Array.Copy(intermediate.ownerentropy, 0, result, 7, 8);
Array.Copy(encryptedpart1, 0, result, 15, 8);
Array.Copy(encryptedpart2, 0, result, 23, 16);
_encryptedKey = Util.ByteArrayToBase58Check(result);
_pubKey = generatedaddress.PublicKeyBytes;
_hash160 = generatedaddress.Hash160;
var ps = Org.BouncyCastle.Asn1.Sec.SecNamedCurves.GetByName("secp256k1");
if (retainPrivateKeyWhenPossible && intermediate.passfactor != null) {
BigInteger privatekey = new BigInteger(1, intermediate.passfactor).Multiply(new BigInteger(1, factorb)).Mod(ps.N);
_privKey = new KeyPair(privatekey).PrivateKeyBytes;
}
// create the confirmation code
confirmationCodeInfo = new byte[51];
// constant provides for prefix "cfrm38"
confirmationCodeInfo[0] = 0x64;
confirmationCodeInfo[1] = 0x3B;
confirmationCodeInfo[2] = 0xF6;
confirmationCodeInfo[3] = 0xA8;
confirmationCodeInfo[4] = 0x9A;
// fields for flagbyte, addresshash, and ownerentropy all copy verbatim
Array.Copy(result, 2, confirmationCodeInfo, 5, 1 + 4 + 8);
}
/// <summary>
/// Calculates public key and returns true if calculating public key was possible.
/// This might cause a delay of milliseconds if it must be computed from the public
/// key, possibly more if it leads to decrypting a private key.
/// </summary>
protected virtual bool calculatePubKey()
{
if (IsUnencryptedPrivateKeyAvailable()) {
KeyPair kp = new KeyPair(_privKey, compressed: IsCompressedPoint, addressType: _addressType);
_pubKey = kp.PublicKeyBytes;
return true;
}
return false;
}
protected virtual bool calculateHash160()
{
if (IsPublicKeyAvailable()) {
if (_pubKey == null) {
KeyPair kp = new KeyPair(_privKey, this.IsCompressedPoint, this._addressType);
_pubKey = kp.PublicKeyBytes;
_hash160 = kp.Hash160;
} else {
PublicKey pub = new PublicKey(_pubKey);
_hash160 = pub.Hash160;
}
return true;
}
return false;
}
public void CheckBitcoinAddresses()
{
for (int i = 0; i < m_bitcoinPrivKeys.Count; i++)
{
string priv = m_bitcoinPrivKeys[i];
string addr = m_bitcoinAddresses[i];
KeyPair kp = new KeyPair(priv);
Assert.AreEqual(addr, kp.AddressBase58);
}
}
public static MiniKeyPair CreateDeterministic(string seed)
{
// flow:
// 1. take SHA256 of seed to yield 32 bytes
// 2. base58-encode those 32 bytes as though it were a regular private key. now we have 51 characters.
// 3. remove all instances of the digit 1. (likely source of typos)
// 4. take 29 characters starting with position 4
// (this is to skip those first characters of a base58check-encoded private key with low entropy)
// 5. test to see if it matches the typo check. while it does not, increment and try again.
UTF8Encoding utf8 = new UTF8Encoding(false);
byte[] sha256ofseed = Util.ComputeSha256(seed);
string asbase58 = new KeyPair(sha256ofseed).PrivateKeyBase58.Replace("1","");
string keytotry = "S" + asbase58.Substring(4, 29);
char[] chars = keytotry.ToCharArray();
char[] charstest = (keytotry + "?").ToCharArray();
while (Util.ComputeSha256(utf8.GetBytes(charstest))[0] != 0) {
// As long as key doesn't pass typo check, increment it.
for (int i = chars.Length - 1; i >= 0; i--) {
char c = chars[i];
if (c == '9') {
charstest[i] = chars[i] = 'A';
break;
} else if (c == 'H') {
charstest[i] = chars[i] = 'J';
break;
} else if (c == 'N') {
charstest[i] = chars[i] = 'P';
break;
} else if (c == 'Z') {
charstest[i] = chars[i] = 'a';
break;
} else if (c == 'k') {
charstest[i] = chars[i] = 'm';
break;
} else if (c == 'z') {
charstest[i] = chars[i] = '2';
// No break - let loop increment prior character.
} else {
charstest[i] = chars[i] = ++c;
break;
}
}
}
return new MiniKeyPair(new String(chars));
}
/// <summary>
/// Generate a set of M-of-N parts for a specific private key.
/// If desiredPrivKey is null, then a random key will be selected.
/// </summary>
public void Generate(int PartsNeededToDecode, int PartsToGenerate, byte[] desiredPrivKey)
{
if (PartsNeededToDecode > PartsToGenerate) {
throw new ApplicationException("Number of parts needed exceeds number of parts to generate.");
}
if (PartsNeededToDecode > 8 || PartsToGenerate > 8) {
throw new ApplicationException("Maximum number of parts is 8");
}
if (PartsNeededToDecode < 1 || PartsToGenerate < 1) {
throw new ApplicationException("Minimum number of parts is 1");
}
if (desiredPrivKey != null && desiredPrivKey.Length != 32) {
throw new ApplicationException("Desired private key must be 32 bytes");
}
KeyParts.Clear();
decodedKeyParts.Clear();
SecureRandom sr = new SecureRandom();
// Get 8 random big integers into v[i].
byte[][] vvv = new byte[8][];
BigInteger[] v = new BigInteger[8];
for (int i = 0; i < 8; i++) {
byte[] b = new byte[32];
sr.NextBytes(b, 0, 32);
// For larger values of i, chop off some most-significant-bits to prevent overflows as they are
// multiplied with increasingly larger factors.
if (i >= 7) {
b[0] &= 0x7f;
}
v[i] = new BigInteger(1, b);
Debug.WriteLine(String.Format("v({0})={1}", i, v[i].ToString()));
}
// if a certain private key is desired, then specify it.
if (desiredPrivKey != null) {
// replace v[0] with xor(v[1...7]) xor desiredPrivKey
BigInteger newv0 = BigInteger.Zero;
for (int i=1; i<PartsNeededToDecode; i++) {
newv0 = newv0.Xor(v[i]);
}
v[0] = newv0.Xor(new BigInteger(1,desiredPrivKey));
}
// Generate the expected private key from all the parts
BigInteger privkey = new BigInteger("0");
for (int i = 0; i < PartsNeededToDecode; i++) {
privkey = privkey.Xor(v[i]);
}
// Get the bitcoin address
byte[] keybytes = privkey.ToByteArrayUnsigned();
// make sure we have 32 bytes, we'll need it
if (keybytes.Length < 32) {
byte[] array32 = new byte[32];
Array.Copy(keybytes, 0, array32, 32 - keybytes.Length, keybytes.Length);
keybytes = array32;
}
KeyPair = new KeyPair(keybytes);
byte[] checksum = Util.ComputeSha256(BitcoinAddress);
// Generate the parts
for (int i = 0; i < PartsToGenerate; i++) {
BigInteger total = new BigInteger("0");
for (int j = 0; j < PartsNeededToDecode; j++) {
int factor = 1;
for (int ii = 0; ii <= i; ii++) factor = factor * (j + 1);
BigInteger bfactor = new BigInteger(factor.ToString());
total = total.Add(v[j].Multiply(bfactor));
}
Debug.WriteLine(String.Format(" pc{0}={1}", i, total.ToString()));
byte[] parts = new byte[39];
parts[0] = 0x4f;
parts[1] = (byte)(0x93 + PartsNeededToDecode);
int parts23 = (((checksum[0] << 8) + checksum[1]) & 0x1ff);
Debug.WriteLine("checksum " + parts23.ToString());
parts23 += 0x6000;
parts23 += (i << 9);
byte[] btotal = total.ToByteArrayUnsigned();
for (int jj = 0; jj < btotal.Length; jj++) {
parts[jj + 4 + (35 - btotal.Length)] = btotal[jj];
}
parts[2] = (byte)((parts23 & 0xFF00) >> 8);
parts[3] = (byte)(parts23 & 0xFF);
KeyParts.Add(Util.ByteArrayToBase58Check(parts));
decodedKeyParts.Add(parts);
}
}
/// <summary>
/// Encryption constructor to create a new random key from an intermediate
/// </summary>
public Bip38KeyPair(Bip38Intermediate intermediate, bool retainPrivateKeyWhenPossible = false)
{
// generate seedb
byte[] seedb = new byte[24];
SecureRandom sr = new SecureRandom();
sr.NextBytes(seedb);
// get factorb as sha256(sha256(seedb))
Sha256Digest sha256 = new Sha256Digest();
sha256.BlockUpdate(seedb, 0, 24);
factorb = new byte[32];
sha256.DoFinal(factorb, 0);
sha256.BlockUpdate(factorb, 0, 32);
sha256.DoFinal(factorb, 0);
// get ECPoint from passpoint
PublicKey pk = new PublicKey(intermediate.passpoint);
ECPoint generatedpoint = pk.GetECPoint().Multiply(new BigInteger(1, factorb));
byte[] generatedpointbytes = generatedpoint.GetEncoded();
PublicKey generatedaddress = new PublicKey(generatedpointbytes);
// get addresshash
UTF8Encoding utf8 = new UTF8Encoding(false);
byte[] generatedaddressbytes = utf8.GetBytes(generatedaddress.AddressBase58);
sha256.BlockUpdate(generatedaddressbytes, 0, generatedaddressbytes.Length);
byte[] addresshashfull = new byte[32];
sha256.DoFinal(addresshashfull, 0);
sha256.BlockUpdate(addresshashfull, 0, 32);
sha256.DoFinal(addresshashfull, 0);
byte[] addresshashplusownerentropy = new byte[12];
Array.Copy(addresshashfull, 0, addresshashplusownerentropy, 0, 4);
Array.Copy(intermediate.ownerentropy, 0, addresshashplusownerentropy, 4, 8);
// derive encryption key material
derived = new byte[64];
SCrypt.ComputeKey(intermediate.passpoint, addresshashplusownerentropy, 1024, 1, 1, 1, derived);
byte[] derivedhalf2 = new byte[32];
Array.Copy(derived, 32, derivedhalf2, 0, 32);
byte[] unencryptedpart1 = new byte[16];
for (int i = 0; i < 16; i++)
{
unencryptedpart1[i] = (byte)(seedb[i] ^ derived[i]);
}
byte[] encryptedpart1 = new byte[16];
// encrypt it
var aes = Aes.Create();
aes.KeySize = 256;
aes.Mode = CipherMode.ECB;
aes.Key = derivedhalf2;
ICryptoTransform encryptor = aes.CreateEncryptor();
encryptor.TransformBlock(unencryptedpart1, 0, 16, encryptedpart1, 0);
encryptor.TransformBlock(unencryptedpart1, 0, 16, encryptedpart1, 0);
byte[] unencryptedpart2 = new byte[16];
for (int i = 0; i < 8; i++)
{
unencryptedpart2[i] = (byte)(encryptedpart1[i + 8] ^ derived[i + 16]);
}
for (int i = 0; i < 8; i++)
{
unencryptedpart2[i + 8] = (byte)(seedb[i + 16] ^ derived[i + 24]);
}
byte[] encryptedpart2 = new byte[16];
encryptor.TransformBlock(unencryptedpart2, 0, 16, encryptedpart2, 0);
encryptor.TransformBlock(unencryptedpart2, 0, 16, encryptedpart2, 0);
byte[] result = new byte[39];
result[0] = 0x01;
result[1] = 0x43;
result[2] = generatedaddress.IsCompressedPoint ? (byte)0x20 : (byte)0x00;
if (intermediate.LotSequencePresent)
{
result[2] |= 0x04;
}
Array.Copy(addresshashfull, 0, result, 3, 4);
Array.Copy(intermediate.ownerentropy, 0, result, 7, 8);
Array.Copy(encryptedpart1, 0, result, 15, 8);
Array.Copy(encryptedpart2, 0, result, 23, 16);
_encryptedKey = Util.ByteArrayToBase58Check(result);
_pubKey = generatedaddress.PublicKeyBytes;
_hash160 = generatedaddress.Hash160;
var ps = Org.BouncyCastle.Asn1.Sec.SecNamedCurves.GetByName("secp256k1");
if (retainPrivateKeyWhenPossible && intermediate.passfactor != null)
{
BigInteger privatekey = new BigInteger(1, intermediate.passfactor).Multiply(new BigInteger(1, factorb)).Mod(ps.N);
_privKey = new KeyPair(privatekey).PrivateKeyBytes;
}
// create the confirmation code
confirmationCodeInfo = new byte[51];
// constant provides for prefix "cfrm38"
confirmationCodeInfo[0] = 0x64;
confirmationCodeInfo[1] = 0x3B;
confirmationCodeInfo[2] = 0xF6;
confirmationCodeInfo[3] = 0xA8;
confirmationCodeInfo[4] = 0x9A;
// fields for flagbyte, addresshash, and ownerentropy all copy verbatim
Array.Copy(result, 2, confirmationCodeInfo, 5, 1 + 4 + 8);
}
public override bool DecryptWithPassphrase(string passphrase)
{
if (passphrase == null)
{
return(false);
}
byte[] hex = Util.Base58CheckToByteArray(_encryptedKey);
KeyPair tempkey = null;
if (hex.Length == 39 && hex[0] == 1 && hex[1] == 0x42)
{
UTF8Encoding utf8 = new UTF8Encoding(false);
byte[] addresshash = new byte[] { hex[3], hex[4], hex[5], hex[6] };
byte[] derivedBytes = new byte[64];
SCrypt.ComputeKey(utf8.GetBytes(passphrase), addresshash, 16384, 8, 8, 8, derivedBytes);
var aes = Aes.Create();
aes.KeySize = 256;
aes.Mode = CipherMode.ECB;
byte[] aeskey = new byte[32];
Array.Copy(derivedBytes, 32, aeskey, 0, 32);
aes.Key = aeskey;
ICryptoTransform decryptor = aes.CreateDecryptor();
byte[] decrypted = new byte[32];
decryptor.TransformBlock(hex, 7, 16, decrypted, 0);
decryptor.TransformBlock(hex, 7, 16, decrypted, 0);
decryptor.TransformBlock(hex, 23, 16, decrypted, 16);
decryptor.TransformBlock(hex, 23, 16, decrypted, 16);
for (int x = 0; x < 32; x++)
{
decrypted[x] ^= derivedBytes[x];
}
tempkey = new KeyPair(decrypted, compressed: IsCompressedPoint);
Sha256Digest sha256 = new Sha256Digest();
byte[] addrhash = new byte[32];
byte[] addrtext = utf8.GetBytes(tempkey.AddressBase58);
sha256.BlockUpdate(addrtext, 0, addrtext.Length);
sha256.DoFinal(addrhash, 0);
sha256.BlockUpdate(addrhash, 0, 32);
sha256.DoFinal(addrhash, 0);
if (addrhash[0] != hex[3] || addrhash[1] != hex[4] || addrhash[2] != hex[5] || addrhash[3] != hex[6])
{
return(false);
}
_privKey = tempkey.PrivateKeyBytes;
_pubKey = tempkey.PublicKeyBytes;
_hash160 = tempkey.Hash160;
return(true);
}
else if (hex.Length == 39 && hex[0] == 1 && hex[1] == 0x43)
{
// produce the intermediate from the passphrase
// get ownersalt and encryptedpart2 since they are in the record
byte[] ownersalt = new byte[8];
Array.Copy(hex, 7, ownersalt, 0, 8);
bool includeHashStep = (hex[2] & 4) == 4;
Bip38Intermediate intermediate = new Bip38Intermediate(passphrase, ownersalt, includeHashStep);
this.LotNumber = intermediate.LotNumber;
this.SequenceNumber = intermediate.SequenceNumber;
tempkey = decryptUsingIntermediate(intermediate, hex);
if (verifyAddressHash(tempkey.AddressBase58, hex) == false)
{
return(false);
}
}
_privKey = tempkey.PrivateKeyBytes;
_pubKey = tempkey.PublicKeyBytes;
_hash160 = tempkey.Hash160;
return(true);
}
private void btnDecrypt_Click(object sender, EventArgs e)
{
// Remove any spaces or dashes from the encrypted key (in case they were typed)
txtEncrypted.Text = txtEncrypted.Text.Replace("-", "").Replace(" ", "");
if (txtEncrypted.Text == "" || txtPassphrase.Text == "") {
MessageBox.Show("Enter an encrypted key and its passphrase.", "Entries Required", MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}
// What were we given as encrypted text?
object encrypted = StringInterpreter.Interpret(txtEncrypted.Text);
if (encrypted == null) {
if (txtEncrypted.Text.StartsWith("cfrm38")) {
var r = MessageBox.Show("This is not a private key. This looks like a confirmation code. " +
"Do you want to open the Confirmation Code Validator?", "Invalid private key", MessageBoxButtons.YesNo, MessageBoxIcon.Exclamation);
if (r == DialogResult.Yes) {
Program.ShowConfValidator();
}
return;
}
string containsL = "";
if (txtEncrypted.Text.Contains("l")) {
containsL = " Your entry contains the lowercase letter l. Private keys are far " +
"more likely to contain the digit 1, and not the lowercase letter l.";
}
MessageBox.Show("The private key entry (top box) was invalid. " +
"Please verify the private key was properly typed." + containsL, "Invalid private key", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return;
} if (encrypted is PassphraseKeyPair) {
PassphraseKeyPair pkp = encrypted as PassphraseKeyPair;
if (pkp.DecryptWithPassphrase(txtPassphrase.Text) == false) {
MessageBox.Show("The passphrase is incorrect.", "Could not decrypt", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return;
}
MessageBox.Show("Decryption successful.", "Decryption", MessageBoxButtons.OK, MessageBoxIcon.Information);
Program.ShowAddressUtility();
Program.AddressUtility.DisplayKeyCollectionItem(new KeyCollectionItem(pkp.GetUnencryptedPrivateKey()));
return;
} else if (encrypted is KeyPair) {
// it's unencrypted - perhaps we're doing an EC multiply and the passphrase is a private key.
object encrypted2 = StringInterpreter.Interpret(txtPassphrase.Text);
if (encrypted2 == null) {
var r = MessageBox.Show("Does the key you entered belong to the following address?: " + (encrypted as KeyPair).AddressBase58,
"Key appears unencrypted",
MessageBoxButtons.YesNo);
if (r == DialogResult.Yes) {
r = MessageBox.Show("Then this key is already unencrypted and you don't need to decrypt it. " +
"Would you like to open it in the Address Utility screen to see its various forms?", "Key is not encrypted", MessageBoxButtons.YesNo, MessageBoxIcon.Information);
if (r == DialogResult.Yes) {
Program.ShowAddressUtility();
Program.AddressUtility.DisplayKeyCollectionItem(new KeyCollectionItem(encrypted as KeyPair));
}
} else {
MessageBox.Show("The passphrase or secondary key is incorrect. Please verify it was properly typed.", "Second entry is not a valid private key", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
}
return;
}
BigInteger n1 = new BigInteger(1, (encrypted as KeyPair).PrivateKeyBytes);
BigInteger n2 = new BigInteger(1, (encrypted2 as KeyPair).PrivateKeyBytes);
var ps = Org.BouncyCastle.Asn1.Sec.SecNamedCurves.GetByName("secp256k1");
BigInteger privatekey = n1.Multiply(n2).Mod(ps.N);
MessageBox.Show("Keys successfully combined using EC multiplication.", "EC multiplication successful", MessageBoxButtons.OK, MessageBoxIcon.Information);
if (n1.Equals(n2)) {
MessageBox.Show("The two key entries have the same public hash. The results you see might be wrong.", "Duplicate key hash", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
// use private key
KeyPair kp = new KeyPair(privatekey);
Program.ShowAddressUtility();
Program.AddressUtility.DisplayKeyCollectionItem(new KeyCollectionItem(kp));
} else if (encrypted is AddressBase) {
MessageBox.Show("This is not a private key. It looks like an address or a public key. Private keys usually start with 5, 6, or S.", "Not a private key", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
} else {
MessageBox.Show("This is not a private key that this program can decrypt.", "Not a recognized private key", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
}
}
/// <summary>
/// Constructor which attempts to redeem a completed set of three codes, and calculate the private key.
/// </summary>
public EscrowCodeSet(string code1, string code2, string code3)
{
if (code1 == null || code2 == null || code3 == null || code1 == "" || code2 == "" || code3 == "")
{
throw new ArgumentException("Three codes are required to use this function.");
}
string codea = null, codeb = null, codep = null;
if (code1.StartsWith("einva"))
{
codea = code1;
}
if (code2.StartsWith("einva"))
{
codea = code2;
}
if (code3.StartsWith("einva"))
{
codea = code3;
}
if (code1.StartsWith("einvb"))
{
codeb = code1;
}
if (code2.StartsWith("einvb"))
{
codeb = code2;
}
if (code3.StartsWith("einvb"))
{
codeb = code3;
}
if (code1.StartsWith("einvp"))
{
codep = code1;
}
if (code2.StartsWith("einvp"))
{
codep = code2;
}
if (code3.StartsWith("einvp"))
{
codep = code3;
}
if (codea == null || codeb == null || codep == null)
{
throw new ArgumentException("In order to use this function, one code MUST be an Escrow Invitation A (starting " +
"with \"einva\"), one must be an Escrow Invitation B (starting with \"einvb\") and the last " +
"code MUST be a Payment Invitation (starting with \"einvp\").");
}
byte[] pubparta, privparta;
int identifier30a;
string failreason = parseEscrowCode(codea, out pubparta, out privparta, out identifier30a);
if (failreason != null)
{
throw new ArgumentException("Escrow Invitation Code A: " + failreason);
}
byte[] pubpartb, privpartb;
int identifier30b;
failreason = parseEscrowCode(codeb, out pubpartb, out privpartb, out identifier30b);
if (failreason != null)
{
throw new ArgumentException("Escrow Invitation Code B: " + failreason);
}
if (identifier30a != identifier30b)
{
throw new ArgumentException("The two Escrow Invitations are not mates and cannot unlock the private key.");
}
string notvalid = "Not a valid Payment Invitation Code";
string notvalid2 = "Code is not a valid Payment Invitation Code or may have a typo or other error.";
// string notvalid3 = "The Payment Invitation does not belong to the provided Escrow Invitation.";
long headp;
byte[] invbytesp;
string failReason = parseEitherCode(codep, notvalid, notvalid2, out invbytesp, out headp);
if (headp < headbaseP)
{
throw new ArgumentException(notvalid);
}
long identifier30L = headp - headbaseP;
if (identifier30L < 0 || identifier30L > 0x3FFFFFFFL)
{
throw new ArgumentException(notvalid);
}
if (identifier30L != (long)identifier30a)
{
throw new ArgumentException("The Payment Invitation was not generated from either of the provided Escrow Invitation codes and cannot be unlocked by them.");
}
byte[] privpartz = new byte[32];
Array.Copy(invbytesp, 8 + 1 + 1, privpartz, 0, 32);
byte networkByte = invbytesp[8];
bool compressedFlag = (invbytesp[8 + 1 + 1 + 32 + 20] & 0x1) == 1;
// get private key
BigInteger xyz = new BigInteger(1, privparta).Multiply(new BigInteger(1, privpartb)).Multiply(new BigInteger(1, privpartz));
var ps = Org.BouncyCastle.Asn1.Sec.SecNamedCurves.GetByName("secp256k1");
xyz = xyz.Mod(ps.N);
KeyPair kp = new KeyPair(xyz, compressedFlag, networkByte);
// provide everything
this.EscrowInvitationCodeA = codea;
this.EscrowInvitationCodeB = codeb;
this.PaymentInvitationCode = codep;
this.BitcoinAddress = kp.AddressBase58;
this.PrivateKey = kp.PrivateKey;
}
public BitsharesKeyPair(string wifPrivateKey)
{
m_btcKeyPair = new KeyPair(wifPrivateKey);
m_ripe = System.Security.Cryptography.RIPEMD160.Create();
}
/// <summary>
/// Default constructor. Creates a new matched pair of escrow invitation codes.
/// </summary>
public EscrowCodeSet()
{
SecureRandom sr = new SecureRandom();
byte[] x = new byte[32];
byte[] y = new byte[32];
sr.NextBytes(x);
sr.NextBytes(y);
// Force x to be even
// Force y to be odd
x[31] &= 0xFE;
y[31] |= 0x01;
KeyPair kx = new KeyPair(x, true);
KeyPair ky = new KeyPair(y, true);
BigInteger xi = new BigInteger(1, x);
BigInteger yi = new BigInteger(1, y);
ECPoint Gx = kx.GetECPoint();
byte[] bytesGx = Gx.GetEncoded();
ECPoint Gy = ky.GetECPoint();
byte[] bytesGy = Gy.GetEncoded();
ECPoint Gxy = Gx.Multiply(yi);
byte[] bytesGxy = Gxy.GetEncoded();
Sha256Digest sha256 = new Sha256Digest();
byte[] hashGxy = new byte[32];
sha256.BlockUpdate(bytesGxy, 0, bytesGxy.Length);
sha256.DoFinal(hashGxy, 0);
sha256.BlockUpdate(hashGxy, 0, 32);
sha256.DoFinal(hashGxy, 0);
int identifier30 = ((hashGxy[0] & 0x3f) << 24) + (hashGxy[1] << 16) + (hashGxy[2] << 8) + hashGxy[3];
byte[] invitationA = new byte[74];
byte[] invitationB = new byte[74];
long headA = headbaseA + (long)identifier30;
long headB = headbaseB + (long)identifier30;
// turn headA and headB into bytes
for (int i = 7; i >= 0; i--)
{
invitationA[i] = (byte)(headA & 0xFF);
invitationB[i] = (byte)(headB & 0xFF);
headA >>= 8;
headB >>= 8;
}
Array.Copy(x, 0, invitationA, 8 + 1, 32);
Array.Copy(y, 0, invitationB, 8 + 1, 32);
Array.Copy(bytesGy, 0, invitationA, 8 + 1 + 32, 33);
Array.Copy(bytesGx, 0, invitationB, 8 + 1 + 32, 33);
EscrowInvitationCodeA = Util.ByteArrayToBase58Check(invitationA);
EscrowInvitationCodeB = Util.ByteArrayToBase58Check(invitationB);
}
private void setAddressConfirmationCode(int identifier30, byte networkbyte, byte flagbyte, byte[] z, byte[] hash160)
{
byte[] accbytes = new byte[74];
long head = headconfP + (int)identifier30;
for (int i=7; i>=0; i--) {
accbytes[i] = (byte)(head & 0x7F);
head >>= 8;
}
accbytes[8]=networkbyte;
byte[] Gzbytes = new KeyPair(z, true).GetECPoint().GetEncoded();
Array.Copy(Gzbytes, 0, accbytes, 8+1, 33);
Array.Copy(hash160, 0, accbytes, 8+1+33, 20);
accbytes[8+1+33+20] = flagbyte;
this.AddressConfirmationCode = Util.ByteArrayToBase58Check(accbytes);
}
/// <summary>
/// Returns true if a given string can be turned into a private key.
/// </summary>
public static bool IsValidPrivateKey(string key)
{
KeyPair kp = new KeyPair();
string result = kp.constructWithKey(key, false);
return (result == null);
}
public void Decode()
{
ChecksumMatched=false;
Decoded=false;
KeyPair = null;
if (PartsAccepted < PartsNeeded) return;
BigInteger[] pc = new BigInteger[8];
for (int i = 0; i < decodedKeyParts.Count; i++) {
byte[] g = decodedKeyParts[i];
pc[i] = new BigInteger(1, g, 4, 35);
// If there is an overflow, then add it in.
if ((g[2] & 0x80) == 0x80) {
pc[i] = pc[i].Add(new BigInteger(((int)((g[2] & 0x60) >> 5)).ToString()).ShiftLeft(280));
Debug.WriteLine("overflow added");
}
}
List<equation> equations = new List<equation>();
// create equations for all the parts we need.
for (int i = 0; i < PartsNeeded; i++) {
byte[] got = decodedKeyParts[i];
// extract out part number
int partnumber0 = (byte)((got[2] & 0x0e) >> 1);
equations.Add(new equation(i, PartsNeeded, partnumber0));
}
List<List<equation>> steps = new List<List<equation>>();
steps.Add(equations);
// goal: get our equation set down such that there's only one coefficient on the left side.
while (equations.Count > 1) {
equations = solvesome(equations);
steps.Add(equations);
Debug.WriteLine("-----");
foreach (equation eq in equations) {
Debug.WriteLine(eq.ToString());
}
}
BigInteger[] v = new BigInteger[8];
while (steps.Count > 0) {
// pop off the last step
List<equation> laststeps = steps[steps.Count - 1];
steps.RemoveAt(steps.Count - 1);
equation laststep = laststeps[0];
Debug.WriteLine("-----");
Debug.WriteLine(laststep.ToString());
// solve for v
long divisor = laststep.leftside[0].multiplier;
laststep.divisor = laststep.leftside[0].multiplier;
laststep.leftside[0].multiplier = 1;
//foreach (coefficient c in laststep.rightside) c.divisor = divisor;
//laststep.subtractor = laststep.subtractor.Divide(new BigInteger(divisor.ToString()));
long idx = laststep.leftside[0].vindex;
v[idx] = laststep.SolveRight(pc);
Debug.WriteLine(String.Format("v({0})={1}", laststep.leftside[0].vindex, v[idx].ToString()));
// go through all other steps and see that our solved value is incorporated into the equation.
foreach (List<equation> eqbl in steps) {
foreach (equation eqb in eqbl) eqb.SolveLeft(v);
}
}
// xor the ones we need
BigInteger xoraccum = BigInteger.Zero;
for (int i = 0; i < PartsNeeded; i++) {
xoraccum = xoraccum.Xor(v[i]);
}
ChecksumMatched = false;
Decoded = true;
byte[] keybytes = xoraccum.ToByteArrayUnsigned();
if (keybytes.Length > 32) {
// if more than 32 bytes, decoding probably went wrong! truncate to 32 bytes, but force a checksum failure
byte[] newkey = new byte[32];
for (int jj = 0; jj < 32; jj++) newkey[jj] = keybytes[jj];
keybytes = newkey;
return;
} else if (keybytes.Length < 32) {
byte[] array32 = new byte[32];
Array.Copy(keybytes, 0, array32, 32 - keybytes.Length, keybytes.Length);
keybytes = array32;
}
KeyPair = new KeyPair(keybytes);
// Get the bitcoin address
byte[] checksum = Util.ComputeSha256(BitcoinAddress);
int mychecksum = ((checksum[0] & 1) << 8) + checksum[1];
if (mychecksum == expectedChecksum) ChecksumMatched=true;
}
public void CheckBitcoinPubKeys()
{
for (int i=0; i<m_bitcoinPrivKeys.Count; i++)
{
string priv = m_bitcoinPrivKeys[i];
string pub = m_bitcoinPubKeys[i];
KeyPair kp = new KeyPair(priv);
Assert.AreEqual( pub, kp.PublicKeyHex.ToLower() );
}
}
public void CheckBtsPubKeys()
{
for (int i = 0; i < m_bitcoinPrivKeys.Count; i++)
{
string priv = m_bitcoinPrivKeys[i];
string pub = m_btsPubKeys[i];
KeyPair kp = new KeyPair(priv);
string compare = BitsharesKeyPair.ComputeBitsharesPubKey(kp.GetCompressed(), m_ripe);
Assert.AreEqual(pub, compare);
}
}
/// <summary>
/// flow:
/// 1. take SHA256 of seed to yield 32 bytes
/// 2. base58-encode those 32 bytes as though it were a regular private key. now we have 51 characters.
/// 3. remove all instances of the digit 1. (likely source of typos)
/// 4. take 29 characters starting with position 4
/// (this is to skip those first characters of a base58check-encoded private key with low entropy)
/// 5. test to see if it matches the typo check. while it does not, increment and try again.
/// </summary>
/// <returns></returns>
public static MiniKeyPair CreateDeterministic(string seed, byte addressType = 0)
{
UTF8Encoding utf8 = new UTF8Encoding(false);
byte[] sha256ofseed = Util.ComputeSha256(seed);
string asbase58 = new KeyPair(sha256ofseed).PrivateKeyBase58.Replace("1","");
string keytotry = "S" + asbase58.Substring(4, 29);
char[] chars = keytotry.ToCharArray();
char[] charstest = (keytotry + "?").ToCharArray();
while (Util.ComputeSha256(utf8.GetBytes(charstest))[0] != 0) {
// As long as key doesn't pass typo check, increment it.
for (int i = chars.Length - 1; i >= 0; i--) {
char c = chars[i];
if (c == '9') {
charstest[i] = chars[i] = 'A';
break;
} else if (c == 'H') {
charstest[i] = chars[i] = 'J';
break;
} else if (c == 'N') {
charstest[i] = chars[i] = 'P';
break;
} else if (c == 'Z') {
charstest[i] = chars[i] = 'a';
break;
} else if (c == 'k') {
charstest[i] = chars[i] = 'm';
break;
} else if (c == 'z') {
charstest[i] = chars[i] = '2';
// No break - let loop increment prior character.
} else {
charstest[i] = chars[i] = ++c;
break;
}
}
}
return new MiniKeyPair(new String(chars), addressType);
}