public static DecryptInfo Decrypt(Stream input, Stream output, string password, Action <double> progress = null, Func <bool> isCanceled = null)
{
var decryptInternalParameter = new DecryptInternalParameter
{
Progress = progress,
IsCanceled = isCanceled,
};
return(DecryptInternal(input, output, null, password, decryptInternalParameter));
}
public static DecryptInfo Decrypt(string inputPath, string outputPath, string password, Action <double> progress = null, Func <bool> isCanceled = null)
{
var decryptInternalParameter = new DecryptInternalParameter
{
Progress = progress,
IsCanceled = isCanceled,
};
using (var input = File.OpenRead(inputPath))
using (var output = File.Open(outputPath, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite))
return(DecryptInternal(input, output, null, password, decryptInternalParameter));
}
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,
});
}
