Encrypts the given message using the given key with AES-CBC. - Java Security

Java examples for Security:AES

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Description

Encrypts the given message using the given key with AES-CBC.

Demo Code


//package com.java2s;

import javax.crypto.*;
import javax.crypto.spec.*;

public class Main {
    /**//www .ja  v  a2s .  c  o m
     * Encrypts the given message using the given key with AES-CBC.
     *
     * @param message  the message (in bytes)
     * @param keySpec  the secret key
     * @return encrypted message (with algorithm parameters appended
     */
    public static byte[] encrypt(byte[] message, SecretKeySpec keySpec) {
        byte[] ret = null;

        try {
            // Initialize the cipher with the given key
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            cipher.init(Cipher.ENCRYPT_MODE, keySpec);

            // encrypt the message
            byte[] cipherText = cipher.doFinal(message);
            byte[] params = cipher.getParameters().getEncoded();

            // Combine the ciphertext and cipher parameters into one byte array
            ret = new byte[cipherText.length + params.length];
            System.arraycopy(cipherText, 0, ret, 0, cipherText.length);
            System.arraycopy(params, 0, ret, cipherText.length,
                    params.length);
        } catch (Exception e) {
            e.printStackTrace();
        }

        return ret;
    }
}

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