private static byte[] GetSecretKey(EcKeyPair privateKey, EllipticCurveEncryptionInformation hybridFileInfo)
{
var derivedSecret = hybridFileInfo.DerivedSecrets.FirstOrDefault(secret => privateKey.CheckPublicKeyHash(secret.PublicKeyHash, secret.PublicKeyHashSalt));
var ds = EllipticCurveCryptographer.DeriveSecret(privateKey, hybridFileInfo.EphemeralKey);
var derivedSecretInputStream = new MemoryStream(derivedSecret.EncryptedSharedSecret);
var derivedSecretOutputStream = new MemoryStream();
SymmetricEncryption.Decrypt(derivedSecretInputStream, derivedSecretOutputStream, ds);
var secretKey = derivedSecretOutputStream.ToArray();
return(secretKey);
}
private static byte[] GetSecretKey(EcIdentifier ecIdentifier, EllipticCurveEncryptionInformation hybridFileInfo, string password)
{
var publicKey = Encryption.NitroKey.EllipticCurveCryptographer.GetPublicKey(ecIdentifier, password);
var derivedSecret = hybridFileInfo.DerivedSecrets.FirstOrDefault(secret => publicKey.CheckPublicKeyHash(secret.PublicKeyHash, secret.PublicKeyHashSalt));
var ds = Encryption.NitroKey.EllipticCurveCryptographer.DeriveSecret(ecIdentifier, hybridFileInfo.EphemeralKey, password);
var derivedSecretInputStream = new MemoryStream(derivedSecret.EncryptedSharedSecret);
var derivedSecretOutputStream = new MemoryStream();
SymmetricEncryption.Decrypt(derivedSecretInputStream, derivedSecretOutputStream, ds);
var secretKey = derivedSecretOutputStream.ToArray();
return(secretKey);
}
public static void Encrypt(Stream input, Stream output, EncryptionParameter parameter)
{
var secretKey = Random.CreateData(SymmetricEncryption.AesKeyLength + SymmetricEncryption.HmacKeyLength);
var hybridFileInfo = EllipticCurveEncryptionInformation.Create(parameter.PublicKeys, secretKey);
var internalParameter = new EncryptInternalParameter
{
Filename = parameter.Filename,
PasswordDerivationSettings = null,
EllipticCurveEncryptionInformation = hybridFileInfo,
Progress = parameter.Progress,
IsCanceled = parameter.IsCanceled
};
SymmetricEncryption.EncryptInternal(input, output, secretKey, internalParameter);
}
