public byte[] Encrypt(PublicKey recipientPublicKey, byte[] plaintext, byte[] macData)
{
byte[] iv = _cryptoRandom.GenerateRandomBytes(KeySize / 8);
PrivateKey ephemeralPrivateKey = _keyGenerator.Generate();
IIesEngine iesEngine = MakeIesEngine(true, recipientPublicKey, ephemeralPrivateKey, iv);
try
{
byte[] cipher = iesEngine.ProcessBlock(plaintext, 0, plaintext.Length, macData);
MemoryStream memoryStream = new MemoryStream();
memoryStream.Write(ephemeralPrivateKey.PublicKey.PrefixedBytes, 0, ephemeralPrivateKey.PublicKey.PrefixedBytes.Length);
memoryStream.Write(iv, 0, iv.Length);
memoryStream.Write(cipher, 0, cipher.Length);
return(memoryStream.ToArray());
}
catch (InvalidCipherTextException)
{
throw;
}
catch (IOException)
{
throw;
}
}
private byte[] Decrypt(PublicKey ephemeralPublicKey, PrivateKey privateKey, byte[] iv, byte[] ciphertextBody, byte[] macData)
{
IIesEngine iesEngine = MakeIesEngine(false, ephemeralPublicKey, privateKey, iv);
return(iesEngine.ProcessBlock(ciphertextBody, 0, ciphertextBody.Length, macData));
}