public async Task <byte[]> DecryptToBytes(ICipherText cipherText, IPublicKey publicKey, ISecretKey secretKey)
{
try
{
var cipherTextFile = await LocalHost.WriteFileAsync(cipherText.Value);
var publicKeyFile = await LocalHost.WriteFileAsync(publicKey.Value);
var secretKeyFile = await LocalHost.WriteFileAsync(secretKey.Value);
var messageFile = LocalHost.GetRandomFilename();
await LocalHost.RunProcessAsync("cpabe-dec", $"-o {messageFile} {publicKeyFile} {secretKeyFile} {cipherTextFile}");
var messageBytes = await LocalHost.ReadFileAsync(messageFile);
File.Delete(publicKeyFile);
File.Delete(secretKeyFile);
return(messageBytes);
}
catch (Exception exception)
{
if (exception.Message.Contains("cannot decrypt"))
{
throw new UnathorizedAttributesAccessException();
}
throw new ABESchemeException("Error has occured during decryption", exception);
}
}
public async Task <string> Decrypt(ICipherText cipherText, IPublicKey publicKey, ISecretKey secretKey)
{
var res = await DecryptToBytes(cipherText, publicKey, secretKey);
return(Encoding.UTF8.GetString(res));
}
