public override IMac CreateEngine(EngineUsage usage)
{
IMac mac = provider.CreateEngine(usage);
if (key != null)
{
mac.Init(new KeyParameter(key.GetKeyBytes()));
}
return(mac);
}
protected override byte[] GenerateWrappedKey(ISymmetricKey contentKey)
{
AsymmetricRsaPublicKey rsaKey = asymmetricPublicKey as AsymmetricRsaPublicKey;
if (rsaKey != null)
{
IKeyWrapper <FipsRsa.OaepWrapParameters> wrapper = CryptoServicesRegistrar.CreateService(rsaKey, new Security.SecureRandom()).CreateKeyWrapper(FipsRsa.WrapOaep.WithDigest(FipsShs.Sha1));
byte[] encKey = wrapper.Wrap(contentKey.GetKeyBytes()).Collect();
return(encKey);
}
throw new InvalidOperationException("algorithm for public key not matched");
}
public PkixContentEncryptor(DerObjectIdentifier encAlgorithm, SecureRandom random)
{
key = keyGenerators[encAlgorithm](random);
algId = Utils.GetEncryptionSchemeIdentifier(encAlgorithm, random);
IParameters <Algorithm> cipherParams = Utils.GetCipherParameters(algId);
if (Utils.IsBlockMode(cipherParams.Algorithm))
{
cipherBuilder = new PkixBlockCipherBuilder(algId, Utils.CreateBlockEncryptorBuilder(encAlgorithm, key.GetKeyBytes(), cipherParams));
}
else if (Utils.IsAeadMode(cipherParams.Algorithm))
{
cipherBuilder = new PkixAeadCipherBuilder(algId, Utils.CreateAeadEncryptorBuilder(encAlgorithm, key.GetKeyBytes(), cipherParams));
}
else
{
cipherBuilder = new PkixCipherBuilder(algId, Utils.CreateEncryptorBuilder(encAlgorithm, key.GetKeyBytes(), cipherParams));
}
}
