Titanium AES/CBC/PKCS5Padding

Question

I am stuck with this for already 2 weeks. Could anybody tell me how to implement AES/CBC/PKCS5Padding (which is already built in Java library for Android) in Appcelerator studio for iOS? I tried Ti.SlowAES and Crypto JS as well but there is nothing PCKS5 Padding in both. The encrypted code is different from the one run by Java. So depressed. Thanks a lot in advance. Any help is appreciated.

Answer 1

Eventually, it's done. So relieved. For somebody has the same problem as I did, I wanna make something basic clear. The first thing is PKCS5 is identical to PKCS7 (just a case of 16 byte of PKCS7). The second thing is in CBC mode, default padding is PKCS7 (it just adds bytes into encrypted byte to make it %16=0) as AES is symmetric encryption.

My solution works with SlowAES with some modification. You just understand that AES encrypt bytes. So no matter u put the input (String), U have to convert to Bytes to encrypted. The encrypted cipher then have to convert from bytes to string. So use some convert function. The encrypted bytes by SlowAES are correct. The problems are only the convert to base64, HexString,...

Answer 2

If the problem is PKCS#5 vs PKCS#7 padding they are same.

The only difference is in the specification: PKCS#5 padding is identical to PKCS#7 padding, except that it has only been defined for block ciphers that use a 64-bit (8 byte) block size and PKCS#7 is defined for up to 255 bytes.