private void btnPrivWIFToHex_Click(object sender, EventArgs e)
{
ChangeFlag++;
try {
object interpretation = StringInterpreter.Interpret(txtPrivWIF.Text, compressed: compressToolStripMenuItem.Checked, addressType: this.AddressTypeByte);
KeyPair kp = null;
if (interpretation is PassphraseKeyPair)
{
if (txtPassphrase.Text == "")
{
MessageBox.Show("This is an encrypted key. A passphrase is required.");
return;
}
PassphraseKeyPair ppkp = (PassphraseKeyPair)interpretation;
if (ppkp.DecryptWithPassphrase(txtPassphrase.Text) == false)
{
MessageBox.Show("The passphrase is incorrect.");
return;
}
kp = ppkp.GetUnencryptedPrivateKey();
}
else if (interpretation is KeyPair)
{
kp = (KeyPair)interpretation;
}
if (kp == null)
{
MessageBox.Show("Not a valid private key.");
return;
}
SetText(txtPrivHex, kp.PrivateKeyHex);
SetText(txtPubHex, kp.PublicKeyHex);
SetText(txtPubHash, kp.Hash160Hex);
SetText(txtBtcAddr, new AddressBase(kp, AddressTypeByte).AddressBase58);
} catch (Exception ae) {
MessageBox.Show(ae.Message);
} finally {
ChangeFlag--;
}
}
private void btnConfirm_Click(object sender, EventArgs e)
{
lblAddressHeader.Visible = false;
lblAddressItself.Visible = false;
lblResult.Visible = false;
// check for null entry
if (txtPassphrase.Text == "")
{
MessageBox.Show("Passphrase is required.", "Passphrase required", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return;
}
if (txtConfCode.Text == "")
{
MessageBox.Show("Confirmation code is required.", "Confirmation code required", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return;
}
// Parse confirmation code.
byte[] confbytes = Util.Base58CheckToByteArray(txtConfCode.Text.Trim());
if (confbytes == null)
{
// is it even close?
if (txtConfCode.Text.StartsWith("cfrm38"))
{
MessageBox.Show("This is not a valid confirmation code. It has the right prefix, but " +
"doesn't contain valid confirmation data. Possible typo or incomplete?",
"Invalid confirmation code", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return;
}
MessageBox.Show("This is not a valid confirmation code.", "Invalid confirmation code", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return;
}
if (confbytes.Length != 51 || confbytes[0] != 0x64 || confbytes[1] != 0x3B || confbytes[2] != 0xF6 ||
confbytes[3] != 0xA8 || confbytes[4] != 0x9A || confbytes[18] < 0x02 || confbytes[18] > 0x03)
{
// Unrecognized Base58 object. Do we know what this is? Tell the user.
object result = StringInterpreter.Interpret(txtConfCode.Text.Trim());
if (result != null)
{
// did we actually get an encrypted private key? if so, just try to decrypt it.
if (result is PassphraseKeyPair)
{
PassphraseKeyPair ppkp = result as PassphraseKeyPair;
if (ppkp.DecryptWithPassphrase(txtPassphrase.Text))
{
confirmIsValid(ppkp.GetAddress().AddressBase58);
MessageBox.Show("What you provided contains a private key, not just a confirmation. " +
"Confirmation is successful, and with this correct passphrase, " +
"you are also able to spend the funds from the address.", "This is actually a private key",
MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}
else
{
MessageBox.Show("This is not a valid confirmation code. It looks like an " +
"encrypted private key. Decryption was attempted but the passphrase couldn't decrypt it", "Invalid confirmation code", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return;
}
}
string objectKind = result.GetType().Name;
if (objectKind == "AddressBase")
{
objectKind = "an Address";
}
else
{
objectKind = "a " + objectKind;
}
MessageBox.Show("This is not a valid confirmation code. Instead, it looks like " + objectKind +
". Perhaps you entered the wrong thing? Confirmation codes " +
"start with \"cfrm\".", "Invalid confirmation code", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return;
}
MessageBox.Show("This is not a valid confirmation code.", "Invalid confirmation code", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return;
}
// extract ownersalt and get an intermediate
byte[] ownersalt = new byte[8];
Array.Copy(confbytes, 10, ownersalt, 0, 8);
bool includeHashStep = (confbytes[5] & 0x04) == 0x04;
Bip38Intermediate intermediate = new Bip38Intermediate(txtPassphrase.Text, ownersalt, includeHashStep);
// derive the 64 bytes we need
// get ECPoint from passpoint
PublicKey pk = new PublicKey(intermediate.passpoint);
byte[] addresshashplusownersalt = new byte[12];
Array.Copy(confbytes, 6, addresshashplusownersalt, 0, 4);
Array.Copy(intermediate.ownerentropy, 0, addresshashplusownersalt, 4, 8);
// derive encryption key material
byte[] derived = new byte[64];
CryptSharp.Utility.SCrypt.ComputeKey(intermediate.passpoint, addresshashplusownersalt, 1024, 1, 1, 1, derived);
byte[] derivedhalf2 = new byte[32];
Array.Copy(derived, 32, derivedhalf2, 0, 32);
byte[] unencryptedpubkey = new byte[33];
// recover the 0x02 or 0x03 prefix
unencryptedpubkey[0] = (byte)(confbytes[18] ^ (derived[63] & 0x01));
// decrypt
var aes = Aes.Create();
aes.KeySize = 256;
aes.Mode = CipherMode.ECB;
aes.Key = derivedhalf2;
ICryptoTransform decryptor = aes.CreateDecryptor();
decryptor.TransformBlock(confbytes, 19, 16, unencryptedpubkey, 1);
decryptor.TransformBlock(confbytes, 19, 16, unencryptedpubkey, 1);
decryptor.TransformBlock(confbytes, 19 + 16, 16, unencryptedpubkey, 17);
decryptor.TransformBlock(confbytes, 19 + 16, 16, unencryptedpubkey, 17);
// xor out the padding
for (int i = 0; i < 32; i++)
{
unencryptedpubkey[i + 1] ^= derived[i];
}
// reconstitute the ECPoint
var ps = Org.BouncyCastle.Asn1.Sec.SecNamedCurves.GetByName("secp256k1");
ECPoint point;
try {
point = ps.Curve.DecodePoint(unencryptedpubkey);
// multiply passfactor. Result is going to be compressed.
ECPoint pubpoint = point.Multiply(new BigInteger(1, intermediate.passfactor));
// Do we want it uncompressed? then we will have to uncompress it.
byte flagbyte = confbytes[5];
if ((flagbyte & 0x20) == 0x00)
{
pubpoint = ps.Curve.CreatePoint(pubpoint.X.ToBigInteger(), pubpoint.Y.ToBigInteger(), false);
}
// Convert to bitcoin address and check address hash.
PublicKey generatedaddress = new PublicKey(pubpoint);
// get addresshash
UTF8Encoding utf8 = new UTF8Encoding(false);
Sha256Digest sha256 = new Sha256Digest();
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);
for (int i = 0; i < 4; i++)
{
if (addresshashfull[i] != confbytes[i + 6])
{
MessageBox.Show("This passphrase is wrong or does not belong to this confirmation code.", "Invalid passphrase", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return;
}
}
confirmIsValid(generatedaddress.AddressBase58);
} catch {
// Might throw an exception - not every 256-bit integer is a valid X coordinate
MessageBox.Show("This passphrase is wrong or does not belong to this confirmation code.", "Invalid passphrase", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return;
}
}
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);
}
}
