Java 加密 AES 对称加密算法

【AES】

一种对称加密算法，DES的取代者。

加密相关文章见：Java 加密解密 对称加密算法 非对称加密算法 MD5 BASE64 AES RSA

【代码】

代码比较多，有一部分非本文章内容代码，具体自己看吧。

package com.uikoo9.util.encrypt;import java.math.BigInteger;import java.security.MessageDigest;import java.security.SecureRandom;import javax.crypto.Cipher;import javax.crypto.KeyGenerator;import javax.crypto.spec.SecretKeySpec;import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;import com.uikoo9.util.QStringUtil;/** * 编码工具类 * 1.将byte[]转为各种进制的字符串 * 2.base 64 encode * 3.base 64 decode * 4.获取byte[]的md5值 * 5.获取字符串md5值 * 6.结合base64实现md5加密 * 7.AES加密 * 8.AES加密为base 64 code * 9.AES解密 * 10.将base 64 code AES解密 * @author uikoo9 * @version 0.0.7.20140601 */public class QEncodeUtil {public static void main(String[] args) throws Exception {String content = "我爱你";System.out.println("加密前：" + content);String key = "123456";System.out.println("加密密钥和解密密钥：" + key);String encrypt = aesEncrypt(content, key);System.out.println("加密后：" + encrypt);String decrypt = aesDecrypt(encrypt, key);System.out.println("解密后：" + decrypt);}/** * 将byte[]转为各种进制的字符串 * @param bytes byte[] * @param radix 可以转换进制的范围，从Character.MIN_RADIX到Character.MAX_RADIX，超出范围后变为10进制 * @return 转换后的字符串 */public static String binary(byte[] bytes, int radix){return new BigInteger(1, bytes).toString(radix);// 这里的1代表正数}/** * base 64 encode * @param bytes 待编码的byte[] * @return 编码后的base 64 code */public static String base64Encode(byte[] bytes){return new BASE64Encoder().encode(bytes);}/** * base 64 decode * @param base64Code 待解码的base 64 code * @return 解码后的byte[] * @throws Exception */public static byte[] base64Decode(String base64Code) throws Exception{return QStringUtil.isEmpty(base64Code) ? null : new BASE64Decoder().decodeBuffer(base64Code);}/** * 获取byte[]的md5值 * @param bytes byte[] * @return md5 * @throws Exception */public static byte[] md5(byte[] bytes) throws Exception {MessageDigest md = MessageDigest.getInstance("MD5");md.update(bytes);return md.digest();}/** * 获取字符串md5值 * @param msg  * @return md5 * @throws Exception */public static byte[] md5(String msg) throws Exception {return QStringUtil.isEmpty(msg) ? null : md5(msg.getBytes());}/** * 结合base64实现md5加密 * @param msg 待加密字符串 * @return 获取md5后转为base64 * @throws Exception */public static String md5Encrypt(String msg) throws Exception{return QStringUtil.isEmpty(msg) ? null : base64Encode(md5(msg));}/** * AES加密 * @param content 待加密的内容 * @param encryptKey 加密密钥 * @return 加密后的byte[] * @throws Exception */public static byte[] aesEncryptToBytes(String content, String encryptKey) throws Exception {KeyGenerator kgen = KeyGenerator.getInstance("AES");kgen.init(128, new SecureRandom(encryptKey.getBytes()));Cipher cipher = Cipher.getInstance("AES");cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(kgen.generateKey().getEncoded(), "AES"));return cipher.doFinal(content.getBytes("utf-8"));}/** * AES加密为base 64 code * @param content 待加密的内容 * @param encryptKey 加密密钥 * @return 加密后的base 64 code * @throws Exception */public static String aesEncrypt(String content, String encryptKey) throws Exception {return base64Encode(aesEncryptToBytes(content, encryptKey));}/** * AES解密 * @param encryptBytes 待解密的byte[] * @param decryptKey 解密密钥 * @return 解密后的String * @throws Exception */public static String aesDecryptByBytes(byte[] encryptBytes, String decryptKey) throws Exception {KeyGenerator kgen = KeyGenerator.getInstance("AES");kgen.init(128, new SecureRandom(decryptKey.getBytes()));Cipher cipher = Cipher.getInstance("AES");cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(kgen.generateKey().getEncoded(), "AES"));byte[] decryptBytes = cipher.doFinal(encryptBytes);return new String(decryptBytes);}/** * 将base 64 code AES解密 * @param encryptStr 待解密的base 64 code * @param decryptKey 解密密钥 * @return 解密后的string * @throws Exception */public static String aesDecrypt(String encryptStr, String decryptKey) throws Exception {return QStringUtil.isEmpty(encryptStr) ? null : aesDecryptByBytes(base64Decode(encryptStr), decryptKey);}}

【输出】

加密前：我爱你加密密钥和解密密钥：123456加密后：A63fa7DjAe3yYji44BTm1g==解密后：我爱你