Java AES加密解密工具类

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import java.io.UnsupportedEncodingException;import java.security.InvalidKeyException;import java.security.NoSuchAlgorithmException;import java.security.SecureRandom;import javax.crypto.BadPaddingException;import javax.crypto.Cipher;import javax.crypto.IllegalBlockSizeException;import javax.crypto.KeyGenerator;import javax.crypto.NoSuchPaddingException;import javax.crypto.SecretKey;import javax.crypto.spec.SecretKeySpec; /** * AESUtil.java *  * @author Techzero * @Email techzero@163.com * @Time 2013-12-12 下午1:25:44 */public class AESUtil {     public static void main(String[] args) {        String content = "AEStest123";        String password = "ytd2016";        System.out.println("密　钥：" + password);        System.out.println("加密前：" + content);        // 加密        String encryptResult = encrypt(content, password);        System.out.println("加密后：" + encryptResult);        // 解密        String decryptResult = decrypt(encryptResult, password);        System.out.println("解密后：" + decryptResult);    }     /**     * 加密     *      * @param content     *            待加密内容     * @param key     *            加密的密钥     * @return     */    public static String encrypt(String content, String key) {        try {            KeyGenerator kgen = KeyGenerator.getInstance("AES");            kgen.init(128, new SecureRandom(key.getBytes()));            SecretKey secretKey = kgen.generateKey();            byte[] enCodeFormat = secretKey.getEncoded();            SecretKeySpec secretKeySpec = new SecretKeySpec(enCodeFormat, "AES");            Cipher cipher = Cipher.getInstance("AES");            byte[] byteContent = content.getBytes("utf-8");            cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);            byte[] byteRresult = cipher.doFinal(byteContent);            StringBuffer sb = new StringBuffer();            for (int i = 0; i < byteRresult.length; i++) {                String hex = Integer.toHexString(byteRresult[i] & 0xFF);                if (hex.length() == 1) {                    hex = '0' + hex;                }                sb.append(hex.toUpperCase());            }            return sb.toString();        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();        } catch (NoSuchPaddingException e) {            e.printStackTrace();        } catch (InvalidKeyException e) {            e.printStackTrace();        } catch (UnsupportedEncodingException e) {            e.printStackTrace();        } catch (IllegalBlockSizeException e) {            e.printStackTrace();        } catch (BadPaddingException e) {            e.printStackTrace();        }        return null;    }     /**     * 解密     *      * @param content     *            待解密内容     * @param key     *            解密的密钥     * @return     */    public static String decrypt(String content, String key) {        if (content.length() < 1)            return null;        byte[] byteRresult = new byte[content.length() / 2];        for (int i = 0; i < content.length() / 2; i++) {            int high = Integer.parseInt(content.substring(i * 2, i * 2 + 1), 16);            int low = Integer.parseInt(content.substring(i * 2 + 1, i * 2 + 2), 16);            byteRresult[i] = (byte) (high * 16 + low);        }        try {            KeyGenerator kgen = KeyGenerator.getInstance("AES");            kgen.init(128, new SecureRandom(key.getBytes()));            SecretKey secretKey = kgen.generateKey();            byte[] enCodeFormat = secretKey.getEncoded();            SecretKeySpec secretKeySpec = new SecretKeySpec(enCodeFormat, "AES");            Cipher cipher = Cipher.getInstance("AES");            cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);            byte[] result = cipher.doFinal(byteRresult);            return new String(result);        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();        } catch (NoSuchPaddingException e) {            e.printStackTrace();        } catch (InvalidKeyException e) {            e.printStackTrace();        } catch (IllegalBlockSizeException e) {            e.printStackTrace();        } catch (BadPaddingException e) {            e.printStackTrace();        }        return null;    } }
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