/// <summary>
/// Returns a <see cref="NSData"/> instance from the serialization context.
/// </summary>
private static NSData DataFromSerialization (SerializationInfo info)
{
SerializationInfoEnumerator enumerator = info.GetEnumerator ();
while (enumerator.MoveNext()) {
if (String.Equals (enumerator.Name, "Data", StringComparison.OrdinalIgnoreCase)) {
try {
byte[] buffer = (byte[])enumerator.Value;
if (buffer != null) {
// Wraps the byte array into a NSdata
NSData data = new NSData (buffer);
return data.SafeAutorelease<NSData> ();
}
} catch (Exception) {
// Do nothing
}
}
}
return null;
}
/// <summary>
/// Decrypts the given data by using the <see cref="ArtworkEncrypter"/> tool.
/// </summary>
/// <param name="encryptedData">The encrypted artwork data.</param>
/// <param name="encryptionSeed">The encryption seed to use.</param>
/// <returns>The decrypted artwork data.</returns>
public static NSData DecryptData(NSData encryptedData, NSString encryptionSeed)
{
NSData result;
try
{
Aes aes = FileEncrypter.GetProvider(encryptionSeed);
byte[] encryptedBytes = encryptedData.GetBuffer();
byte[] decryptedBytes = FileEncrypter.Decrypt(encryptedBytes, aes);
result = new NSData(decryptedBytes);
}
catch (Exception e)
{
Logger.Warn("NSData", "Cannot decrypt encrypted data: " + e);
result = NSData.Data.Copy<NSData>();
}
return result.SafeAutorelease<NSData>();
}
