Shanty Shanty - 17 days ago 7
Java Question

Encrypt text to AES/CBC/PKCS7Padding

I am developing a web application to encrypt some texts with java 6.

The encrypted that I have to do is a AES (Rijndael) in CBC mode with PKCS7 padding and a 128-bit key.

I saw an article that explains how to encrypt in the same way I have to do, but with PKCS5 padding.

The link of the article is here:

https://bit502.wordpress.com/2014/06/27/codigo-java-encriptar-y-desencriptar-texto-usando-el-algoritmo-aes-con-cifrado-por-bloques-cbc-de-128-bits/

I change

private final static String cI = "AES/CBC/PKCS5Padding";


To

private final static String cI = "AES/CBC/PKCS7Padding";


But Java couldn't find a provider for this.

Could someone tell me how I have to do?

Answer

Java only provides PKCS#5 padding, but it is the same as PKCS#7 padding. See this question on Crypto.SE:

What is the difference between PKCS#5 padding and PKCS#7 padding

They are interchangeable for the common block ciphers like AES and DES.