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using System;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Encodings;
using Org.BouncyCastle.Crypto.Engines;
using Org.BouncyCastle.Crypto.Parameters;
namespace Org.BouncyCastle.Tls.Crypto.Impl.BC
{
internal sealed class BcTlsRsaEncryptor
: TlsEncryptor
{
private static RsaKeyParameters CheckPublicKey(RsaKeyParameters pubKeyRsa)
{
if (null == pubKeyRsa || pubKeyRsa.IsPrivate)
throw new ArgumentException("No public RSA key provided", "pubKeyRsa");
return pubKeyRsa;
}
private readonly BcTlsCrypto m_crypto;
private readonly RsaKeyParameters m_pubKeyRsa;
internal BcTlsRsaEncryptor(BcTlsCrypto crypto, RsaKeyParameters pubKeyRsa)
{
this.m_crypto = crypto;
this.m_pubKeyRsa = CheckPublicKey(pubKeyRsa);
}
public byte[] Encrypt(byte[] input, int inOff, int length)
{
try
{
Pkcs1Encoding encoding = new Pkcs1Encoding(new RsaBlindedEngine());
encoding.Init(true, new ParametersWithRandom(m_pubKeyRsa, m_crypto.SecureRandom));
return encoding.ProcessBlock(input, inOff, length);
}
catch (InvalidCipherTextException e)
{
/*
* This should never happen, only during decryption.
*/
throw new TlsFatalAlert(AlertDescription.internal_error, e);
}
}
}
}
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