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using System;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Modes;
using Org.BouncyCastle.Crypto.Parameters;
namespace Org.BouncyCastle.Tls.Crypto.Impl.BC
{
internal sealed class BcTlsAeadCipherImpl
: TlsAeadCipherImpl
{
private readonly bool m_isEncrypting;
private readonly IAeadBlockCipher m_cipher;
private KeyParameter key;
internal BcTlsAeadCipherImpl(IAeadBlockCipher cipher, bool isEncrypting)
{
this.m_cipher = cipher;
this.m_isEncrypting = isEncrypting;
}
public void SetKey(byte[] key, int keyOff, int keyLen)
{
this.key = new KeyParameter(key, keyOff, keyLen);
}
public void Init(byte[] nonce, int macSize, byte[] additionalData)
{
m_cipher.Init(m_isEncrypting, new AeadParameters(key, macSize * 8, nonce, additionalData));
}
public int GetOutputSize(int inputLength)
{
return m_cipher.GetOutputSize(inputLength);
}
public int DoFinal(byte[] input, int inputOffset, int inputLength, byte[] output, int outputOffset)
{
int len = m_cipher.ProcessBytes(input, inputOffset, inputLength, output, outputOffset);
try
{
len += m_cipher.DoFinal(output, outputOffset + len);
}
catch (InvalidCipherTextException e)
{
throw new TlsFatalAlert(AlertDescription.bad_record_mac, e);
}
return len;
}
}
}
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