internal static void EncryptInternal(Stream input, Stream output, byte[] secretKey, EncryptInternalParameter parameter = null)
{
byte[] secretInformationEncryptedData = null;
if (parameter?.Filename != null)
{
var secretInformation = new SecretInformation
{
Filename = parameter.Filename,
};
secretInformationEncryptedData = secretInformation.ToEncyptedData(secretKey);
}
var metaInformation = new MetaInformation
{
PasswordDerivationSettings = parameter?.PasswordDerivationSettings,
SecretInformationEncrypted = secretInformationEncryptedData,
EllipticCurveEncryptionInformation = parameter?.EllipticCurveEncryptionInformation,
};
RawFileAccessor.Init(output);
RawFileAccessor.WriteMeta(output, metaInformation);
RawFileAccessor.SeekToMainData(output);
var result = EncryptRaw(input, output, secretKey, parameter?.Progress, parameter?.IsCanceled);
RawFileAccessor.Write(output, result.iv, RawFileAccessor.Field.InitializationVector);
RawFileAccessor.Write(output, result.hmacHash, RawFileAccessor.Field.Hmac);
output.Dispose();
}
internal static DecryptInfo DecryptInternal(Stream input, Stream output, byte[] secret, string password, DecryptInternalParameter parameter)
{
if (!RawFileAccessor.Verify(input))
{
throw new CryptographicException("File signature is wrong");
}
var fileCargo = RawFileAccessor.ReadMeta(input);
if (password != null)
{
secret = Hasher.CreateAesKeyFromPassword(password, fileCargo.PasswordDerivationSettings.Salt, fileCargo.PasswordDerivationSettings.Iterations);
}
if (parameter?.EllipticCurveDeriveKeyAction != null)
{
secret = parameter?.EllipticCurveDeriveKeyAction(fileCargo.EllipticCurveEncryptionInformation);
}
SecretInformation decryptedSecretInfo = null;
if (fileCargo.SecretInformationEncrypted != null)
{
var memoryStream = new MemoryStream();
DecryptInternal(new MemoryStream(fileCargo.SecretInformationEncrypted), memoryStream, secret, null, null);
decryptedSecretInfo = SecretInformation.FromProtoBufData(memoryStream.ToArray());
}
var iv = RawFileAccessor.Read(input, RawFileAccessor.Field.InitializationVector);
var hmac = RawFileAccessor.Read(input, RawFileAccessor.Field.Hmac);
(byte[] hmac, byte[] iv)param = (hmac, iv);
RawFileAccessor.SeekToMainData(input);
DecryptRaw(input, output, secret, param, parameter?.Progress, parameter?.IsCanceled);
return(new DecryptInfo
{
FileName = decryptedSecretInfo?.Filename,
});
}
