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 Org.BouncyCastle.Crypto.AsymmetricCipherKeyPair GetDsaKeyPair(DSAParameters dp)
{
Org.BouncyCastle.Crypto.Parameters.DsaValidationParameters validationParameters = (dp.Seed != null)
? new Org.BouncyCastle.Crypto.Parameters.DsaValidationParameters(dp.Seed, dp.Counter)
: null;
Org.BouncyCastle.Crypto.Parameters.DsaParameters parameters =
new Org.BouncyCastle.Crypto.Parameters.DsaParameters(
new Org.BouncyCastle.Math.BigInteger(1, dp.P),
new Org.BouncyCastle.Math.BigInteger(1, dp.Q),
new Org.BouncyCastle.Math.BigInteger(1, dp.G),
validationParameters);
Org.BouncyCastle.Crypto.Parameters.DsaPublicKeyParameters pubKey =
new Org.BouncyCastle.Crypto.Parameters.DsaPublicKeyParameters(
new Org.BouncyCastle.Math.BigInteger(1, dp.Y),
parameters);
Org.BouncyCastle.Crypto.Parameters.DsaPrivateKeyParameters privKey =
new Org.BouncyCastle.Crypto.Parameters.DsaPrivateKeyParameters(
new Org.BouncyCastle.Math.BigInteger(1, dp.X),
parameters);
return(new Org.BouncyCastle.Crypto.AsymmetricCipherKeyPair(pubKey, privKey));
}
GenerateDsaKeyPair(Org.BouncyCastle.Security.SecureRandom random, int keystrength)
{
Org.BouncyCastle.Crypto.IAsymmetricCipherKeyPairGenerator keypairGen = new Org.BouncyCastle.Crypto.Generators.DsaKeyPairGenerator();
Org.BouncyCastle.Crypto.Generators.DsaParametersGenerator pGen = new Org.BouncyCastle.Crypto.Generators.DsaParametersGenerator();
pGen.Init(keystrength, 80, random); //TODO:
Org.BouncyCastle.Crypto.Parameters.DsaParameters parameters = pGen.GenerateParameters();
Org.BouncyCastle.Crypto.Parameters.DsaKeyGenerationParameters genParam = new Org.BouncyCastle.Crypto.Parameters.DsaKeyGenerationParameters(random, parameters);
keypairGen.Init(genParam);
Org.BouncyCastle.Crypto.AsymmetricCipherKeyPair kp = keypairGen.GenerateKeyPair();
return(kp);
}
