/// <summary>
/// Sign message with private key.
/// </summary>
/// <param name="bytes">Message to sign.</param>
/// <param name="sk">Secret key used to sign.</param>
/// <param name="watermark">Watermark</param>
/// <returns>Signed message.</returns>
public SignedMessage Sign(string bytes, Keys keys, byte[] watermark = null)
{
byte[] bb = bytes.HexToByteArray();
if (watermark?.Length > 0)
{
byte[] bytesWithWatermark = new byte[bb.Length + watermark.Length];
Array.Copy(watermark, 0, bytesWithWatermark, 0, watermark.Length);
Array.Copy(bb, 0, bytesWithWatermark, watermark.Length, bb.Length);
bb = bytesWithWatermark;
}
// TODO: See if there's a way to further reduce potential attack vectors.
string sk = keys.DecryptPrivateKey();
byte[] dsk = B58C.Decode(sk, Prefix.edsk);
byte[] hash = Hashing.Generic(32 * 8, bb);
byte[] sig = Ed25519.Sign(hash, dsk);
string edsignature = B58C.Encode(sig, Prefix.edsig);
string sbytes = bytes + sig.ToHexString();
return(new SignedMessage
{
Bytes = bb,
SignedHash = sig,
EncodedSignature = edsignature,
SignedBytes = sbytes
});
}
public Keys(byte[] pk, byte[] sk)
{
PublicHash = B58C.Encode(Hashing.Generic(PKHASH_BIT_SIZE, pk), Prefix.tz1);
PublicKey = new SecureString();
PrivateKey = new SecureString();
string encodedPK = B58C.Encode(pk, Prefix.edpk);
foreach (char c in encodedPK)
{
PublicKey.AppendChar(c);
}
string encodedSK = B58C.Encode(sk, Prefix.edsk);
foreach (char c in encodedSK)
{
PrivateKey.AppendChar(c);
}
// Quickly zero out the unneeded key arrays so it doesn't linger in memory before the GC can sweep it up.
Array.Clear(pk, 0, pk.Length);
Array.Clear(sk, 0, sk.Length);
}
/// <summary>
/// Verify a signed message with public key.
/// </summary>
/// <param name="bytes"></param>
/// <param name="sig">Signed message to verify.</param>
/// <param name="pk">Public key used for verification.</param>
/// <returns></returns>
public bool Verify(string bytes, byte[] sig, string pk)
{
byte[] bb = bytes.HexToByteArray();
byte[] edpk = B58C.Decode(pk, Prefix.edpk);
return(Ed25519.Verify(sig, bb, edpk));
}
/// <summary>
/// Checks that a tz1 address is valid.
/// </summary>
/// <param name="tz1">tz1 address to check for validity.</param>
/// <returns>True if valid address.</returns>
public bool CheckAddress(string tz1)
{
try
{
B58C.Decode(tz1, Prefix.tz1);
return(true);
}
catch
{
return(false);
}
}
public static Wallet FromStringSeed(string seed, byte[] prefix = null)
{
return(new Wallet(B58C.Decode(seed, prefix ?? Prefix.edsk)));
}
public string HashBytes()
{
return(B58C.Encode(Hashing.Generic(HASH_SIZE_BITS, Bytes)));
}
