Encryption.decrypt() should throw exception if decryption fails

[itlancer]

Problem Description

Encryption.decrypt() should throw exception if decryption fails. If data corrupted or incorrect key/IV.
Right now there is no way to check if decryption failed.

Tested with multiple AIR 51 versions, even with latest AIR 51.1.2.1 with different applications, different corrupted data, wrong key/IV.
AIR anyway return some ByteArray as a decrypted data result.

You can check what expected with https://anycript.com/crypto or other libs.

Related issues:
#3544
#3543
#229

Steps to Reproduce

Launch application with code below.
It just try to decrypt some random base64 bytes.

Application sample with sources attached.
encryption_decrypt_bug.zip

package {
	import flash.display.Sprite;
	import flash.utils.ByteArray;
	import air.security.Encryption;
	
	public class EncryptionDecryptBug extends Sprite {
		
		public function EncryptionDecryptBug() {
			var data:ByteArray = new ByteArray();
			data.writeBase64("emhou9O241wJuhQAVBEB+Q==");//Some random base64 bytes
			
			var key:ByteArray = new ByteArray();
			key.writeUTFBytes("testtesttesttest");//Any bytes as a key
			
			var iv:ByteArray = new ByteArray();
			iv.writeUTFBytes("testtesttesttest");//Any bytes as an IV
			
			trace(Encryption.decrypt(data, key, iv));//Here exception should be throwed
		}
	}
}

Actual Result:
AIR "decrypt" data and return some bytes: }%�è7�pàÛlҫ"ι�

Expected Result:
Exception should be throwed cause decryption process should be failed.

Known Workarounds

none

1. Use third-party libs for that.
2. Write your own native extension for that.