Encrypt text to AES/CBC/PKCS7Padding

Question

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-bi

Answer 1

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.

Answer 2

The Java specification list a number of encryption modes (and paddings) that needs to be supported. PKCS7Padding is not included.

These are the AES/CBC modes any Java implementation must support.

• AES/CBC/NoPadding (128 bit key)
• AES/CBC/PKCS5Padding (128 bit key)

(See this answer for more information)

Bouncy Castle does however have what you need.

Answer 3

Try this method

String KEY_AES = "**************";
public String encrypt(String value) {
        try {
            byte[] key = KEY_AES.getBytes("UTF-8");
            byte[] ivs = KEY_AES.getBytes("UTF-8");
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
            SecretKeySpec secretKeySpec = new SecretKeySpec(key, "AES");
            AlgorithmParameterSpec paramSpec = new IvParameterSpec(ivs);
            cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, paramSpec);
            return Base64.encodeToString(cipher.doFinal(value.getBytes("UTF-8")), Base64.DEFAULT);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }