public virtual string Decrypt(string password, AesModel aesModel)
{
if (string.IsNullOrWhiteSpace(password))
{
throw new ArgumentException($"{nameof(password)} has no value", nameof(password));
}
var key = new Rfc2898DeriveBytes(password, aesModel.KeyDerivation.Salt, aesModel.KeyDerivation.WorkFactor);
var provider = GetAesProvider();
provider.Key = key.GetBytes(provider.KeySize / 8);
provider.IV = aesModel.InitializationVector;
var cipherText = Convert.FromBase64String(aesModel.Payload);
var transform = provider.CreateDecryptor();
var decryptedBytes = transform.TransformFinalBlock(cipherText, 0, cipherText.Length);
return(Encoding.UTF8.GetString(decryptedBytes));
}
public virtual string Encrypt(string password, string cleartext)
{
if (string.IsNullOrWhiteSpace(password))
{
throw new ArgumentException($"{nameof(password)} has no value", nameof(password));
}
var aesModel = new AesModel
{
Algorithm = "aes-gcm-256",
Version = "1"
};
var provider = GetAesProvider();
var keyDer = new KeyDerivation {
Salt = GetSalt(), WorkFactor = 12000, Function = "PBDKF2"
};
var key = new Rfc2898DeriveBytes(password, keyDer.Salt, keyDer.WorkFactor);
provider.Key = key.GetBytes(provider.KeySize / 8);
aesModel.InitializationVector = provider.IV;
aesModel.KeyDerivation = keyDer;
var transform = provider.CreateEncryptor();
var encryptedByte = transform.TransformFinalBlock(Encoding.UTF8.GetBytes(cleartext), 0, cleartext.Length);
aesModel.Payload = Convert.ToBase64String(encryptedByte);
var stringAes = JsonSerializer.Serialize(aesModel);
if (string.IsNullOrWhiteSpace(stringAes))
{
throw new NotFoundException($"Could not Serialize {nameof(aesModel)}.");
}
return(stringAes);
}
