public static byte[] fromDSAPublicKey(DSAPublicKey key)
{
DNSOutput @out = new DNSOutput();
Org.BouncyCastle.Crypto.Parameters.DsaPublicKeyParameters dp = key.PublicKey;
// BigInteger q = key.getParams().getQ();
Org.BouncyCastle.Math.BigInteger q = dp.Parameters.Q;
// BigInteger p = key.getParams().getP();
Org.BouncyCastle.Math.BigInteger p = dp.Parameters.P;
// BigInteger g = key.getParams().getG();
Org.BouncyCastle.Math.BigInteger g = dp.Parameters.G;
// BigInteger y = key.getY();
Org.BouncyCastle.Math.BigInteger y = dp.Y;
int t = (p.ToByteArray().Length - 64) / 8;
@out.writeU8(t);
Helpers.writeBigInteger(@out, q);
Helpers.writeBigInteger(@out, p);
Helpers.writePaddedBigInteger(@out, g, 8 * t + 64);
Helpers.writePaddedBigInteger(@out, y, 8 * t + 64);
return(@out.toByteArray());
}
private static byte[] fromRSAPublicKey(RSAPublicKey key)
{
DNSOutput @out = new DNSOutput();
Org.BouncyCastle.Crypto.Parameters.RsaKeyParameters kp = key.PublicKey;
// BigInteger exponent = key.getPublicExponent();
Org.BouncyCastle.Math.BigInteger exponent = kp.Exponent;
// BigInteger modulus = key.getModulus();
Org.BouncyCastle.Math.BigInteger modulus = kp.Modulus;
int exponentLength = Helpers.BigIntegerLength(exponent);
if (exponentLength < 256)
{
@out.writeU8(exponentLength);
}
else
{
@out.writeU8(0);
@out.writeU16(exponentLength);
}
Helpers.writeBigInteger(@out, exponent);
Helpers.writeBigInteger(@out, modulus);
return(@out.toByteArray());
}
internal static void writePaddedBigInteger(DNSOutput @out, Org.BouncyCastle.Math.BigInteger val, int len)
{
byte[] b = trimByteArray(val.ToByteArray());
if (b.Length > len)
{
throw new IllegalArgumentException();
}
if (b.Length < len)
{
byte[] pad = new byte[len - b.Length];
@out.writeByteArray(pad);
}
@out.writeByteArray(b);
}
private static byte[] fromECDSAPublicKey(ECPublicKey key, ECKeyInfo keyinfo)
{
DNSOutput @out = new DNSOutput();
Org.BouncyCastle.Crypto.Parameters.ECPublicKeyParameters publicParams = key.PublicKey;
// BigInteger x = key.getW().getAffineX();
Org.BouncyCastle.Math.BigInteger x = publicParams.Q.AffineXCoord.ToBigInteger();
// BigInteger y = key.getW().getAffineY();
Org.BouncyCastle.Math.BigInteger y = publicParams.Q.AffineYCoord.ToBigInteger();
Helpers.writePaddedBigInteger(@out, x, keyinfo.length);
Helpers.writePaddedBigInteger(@out, y, keyinfo.length);
return(@out.toByteArray());
}
internal static void writeBigInteger(DNSOutput @out, Org.BouncyCastle.Math.BigInteger val)
{
byte[] b = trimByteArray(val.ToByteArray());
@out.writeByteArray(b);
}
