/// <summary>
/// Ctor.
/// </summary>
/// <param name="storage"></param>
/// <param name="serializer"></param>
/// <param name="forceEncrypt">If true, checks if existed entries are encrypted, and encrypt them if not.</param>
public EncryptedTableStorageDecorator(
[NotNull] INoSQLTableStorage <T> storage,
[NotNull] ICryptographicSerializer serializer,
bool forceEncrypt = true)
{
_storage = storage ?? throw new ArgumentNullException(nameof(storage));
_serializer = serializer ?? throw new ArgumentNullException(nameof(serializer));
_forceEncrypt = forceEncrypt;
var encryptAttribute = typeof(EncryptAttribute);
_encryptedProperties = typeof(T).GetProperties().Where(x => Attribute.IsDefined(x, encryptAttribute)).ToList();
if (_encryptedProperties.Count == 0)
{
throw new ArgumentException("No properties marked as encrypted.");
}
if (_encryptedProperties.Any(x => x.PropertyType != typeof(string)))
{
throw new ArgumentException($"Only {typeof(string).FullName} type properties can be marked as encrypted.");
}
if (_encryptedProperties.Any(x => x.SetMethod == null || x.GetMethod == null))
{
throw new ArgumentException("Only properties with both Get and Set method allowed. Please check this: " + string.Join(", ",
_encryptedProperties.Where(x => x.SetMethod == null || x.GetMethod == null).Select(x => x.Name)));
}
}
public bool TrySetKey(string key, out string error)
{
error = null;
if (HasKey)
{
error = "Key is already installed.";
return(false);
}
ICryptographicSerializer serializer;
try
{
serializer = new AesSerializer(key);
}
catch (Exception ex)
{
error = $"Wrong key format. {ex.Message}";
return(false);
}
var encryptedStorage = EncryptedTableStorageDecorator <EncryptionInitModel> .Create(_storage, serializer);
if (WasEncryptionSet())
{
try
{
var existingValue = encryptedStorage.GetDataAsync(InitKey, InitKey).GetAwaiter().GetResult();
if (existingValue.Data == InitKey)
{
Serializer = serializer;
return(true);
}
else
{
error = "The specified key is incorrect.";
return(false);
}
}
catch (System.Security.Cryptography.CryptographicException)
{
error = "The specified key is incorrect.";
return(false);
}
}
else
{
// this is a new and the only one key
encryptedStorage.InsertAsync(new EncryptionInitModel {
PartitionKey = InitKey, RowKey = InitKey, Data = InitKey
}).GetAwaiter().GetResult();
Serializer = serializer;
return(true);
}
}
public static INoSQLTableStorage <T> Create(INoSQLTableStorage <T> storage, ICryptographicSerializer algo)
{
return(new EncryptedTableStorageDecorator <T>(storage, algo));
}
