public override Byte[] DecryptData(Byte[] cipheredData, PDUDecrypter.WriteKeySpec keySpec)
{
if (keySpec == PDUDecrypter.WriteKeySpec.Client)
{
return(this.Decrypt(this.CStreamCipher, cipheredData));
}
return(this.Decrypt(this.SStreamCipher, cipheredData));
}
public override void SetIv(Byte[] iv, PDUDecrypter.WriteKeySpec keySpec)
{
var key = keySpec == PDUDecrypter.WriteKeySpec.Client? this._clientKey : this._serverKey;
var cipher = keySpec == PDUDecrypter.WriteKeySpec.Client? this.Ccipher : this.Scipher;
var keyAndIv = new ParametersWithIV(key, iv);
cipher.Reset();
cipher.Init(false, keyAndIv);
}
public override void SetGcmParameters(Byte[] exNonce, PDUDecrypter.WriteKeySpec writeKeySpec)
{
var iv = writeKeySpec == PDUDecrypter.WriteKeySpec.Client? this._clientIv : this._serverIv;
var key = writeKeySpec == PDUDecrypter.WriteKeySpec.Client? this._clientKey : this._serverKey;
var cipher = writeKeySpec == PDUDecrypter.WriteKeySpec.Client? this.CaeadCipher : this.SaeadCipher;
/* Currently Bouncy Castle implementation of GCM supports only MAC size up to 128b */
var par = new AeadParameters(key, this.Digest.GetDigestSize() * 8, iv, exNonce);
cipher.Reset();
cipher.Init(false, par);
}
public override Byte[] DecryptData(Byte[] cipheredData, PDUDecrypter.WriteKeySpec keySpec)
{
switch (this.Mode)
{
case CipherMode.Cbc:
if (keySpec == PDUDecrypter.WriteKeySpec.Client)
{
return(this.Decrypt(this.Ccipher, cipheredData));
}
return(this.Decrypt(this.Scipher, cipheredData));
case CipherMode.Ccm:
case CipherMode.Gcm:
if (keySpec == PDUDecrypter.WriteKeySpec.Client)
{
return(this.Decrypt(this.CaeadCipher, cipheredData));
}
return(this.Decrypt(this.SaeadCipher, cipheredData));
default:
return(null);
}
}
public override void SetIv(Byte[] iv, PDUDecrypter.WriteKeySpec keySpec)
{
throw new NotImplementedException();
}
public override void SetGcmParameters(Byte[] exNonce, PDUDecrypter.WriteKeySpec writeKeySpec)
{
throw new NotImplementedException();
}
public abstract void SetIv(Byte[] iv, PDUDecrypter.WriteKeySpec keySpec);
public abstract void SetGcmParameters(Byte[] exNonce, PDUDecrypter.WriteKeySpec writeKeySpec);
public abstract Byte[] DecryptData(Byte[] cipheredData, PDUDecrypter.WriteKeySpec keySpec);
