private static PublicKey toDSAPublicKey(byte[] keyBytes) // throws IOException, GeneralSecurityException, MalformedKeyException
{
DNSInput @in = new DNSInput(keyBytes);
int t = @in.readU8();
if (t > 8)
{
throw new MalformedKeyException(keyBytes, ARSoft.Tools.Net.Dns.DnsSecAlgorithm.Dsa);
}
Org.BouncyCastle.Math.BigInteger q = Helpers.readBigInteger(@in, 20);
Org.BouncyCastle.Math.BigInteger p = Helpers.readBigInteger(@in, 64 + t * 8);
Org.BouncyCastle.Math.BigInteger g = Helpers.readBigInteger(@in, 64 + t * 8);
Org.BouncyCastle.Math.BigInteger y = Helpers.readBigInteger(@in, 64 + t * 8);
/*
* KeyFactory factory = KeyFactory.getInstance("DSA");
* return factory.generatePublic(new DSAPublicKeySpec(y, p, q, g));
*/
Org.BouncyCastle.Crypto.Parameters.DsaParameters para = new Org.BouncyCastle.Crypto.Parameters.DsaParameters(p, q, g);
Org.BouncyCastle.Crypto.Parameters.DsaPublicKeyParameters dp = new Org.BouncyCastle.Crypto.Parameters.DsaPublicKeyParameters(y, para);
return(PublicKey.CreateInstance(dp));
}
private static PublicKey toRSAPublicKey(byte[] keyBytes) // throws IOException, GeneralSecurityException
{
DNSInput @in = new DNSInput(keyBytes);
int exponentLength = @in.readU8();
if (exponentLength == 0)
{
exponentLength = @in.readU16();
}
Org.BouncyCastle.Math.BigInteger exponent = Helpers.readBigInteger(@in, exponentLength);
Org.BouncyCastle.Math.BigInteger modulus = Helpers.readBigInteger(@in);
/*
* KeyFactory factory = KeyFactory.getInstance("RSA");
* return factory.generatePublic(new RSAPublicKeySpec(modulus, exponent));
*/
Org.BouncyCastle.Crypto.Parameters.RsaKeyParameters kp
= new Org.BouncyCastle.Crypto.Parameters.RsaKeyParameters(false, modulus, exponent);
return(PublicKey.CreateInstance(kp));
}