AES加密算法java实现

转载自： https://blog.csdn.net/zyhlwzy/article/details/77948165

AES加密算法是密码学中的高级加密标准，该加密算法采用对称分组密码体制，密钥长度的最少支持为128、192、256，分组长度128位，算法应易于各种硬件和软件实现。这种加密算法是美国联邦政府采用的区块加密标准，这个标准用来替代原先的DES，已经被多方分析且广为全世界所使用。

过多原理不做解释，可以参考（AES加密算法原理http://www.jiamisoft.com/blog/858-aesjiamisuanfa.html）

java中的具体使用如下：

public class SecurityAESUtils {
private static Logger logger = LogManager.getLogger(SecurityAESUtils.class);

private static final String ENCODEING = "UTF-8"; private static final String ALGORITHM = "AES";//加密算法  private static final String CIPHER_ALGORITHM = "AES/ECB/PKCS5Padding";//算法/工作模式/填充方式   /**  * 加密  * @param plaintext 明文  * @param secureKey 16位长度的密钥  * @return  */ public static String encrypt(String plaintext, String secureKey) throws Exception{     SecretKeySpec sks = getSecretKeySpec(secureKey);     Cipher encryptCipher = getCipher(Cipher.ENCRYPT_MODE, sks);     byte[] result = encryptCipher.doFinal(plaintext.getBytes(ENCODEING));     return  Base64.encodeBase64String(result); }  /**  * 加密  * @param bytes   * @param secureKey 16位长度的密钥  * @return  */ public static String encryptBytes(byte[] bytes, String secureKey) throws Exception{     SecretKeySpec sks = getSecretKeySpec(secureKey);     Cipher encryptCipher = getCipher(Cipher.ENCRYPT_MODE, sks);     byte[] result = encryptCipher.doFinal(bytes);     return  Base64.encodeBase64String(result); }  /**  * 解密  * @param ciphertext 密文  * @return secureKey 16位长度的密钥  * @throws Exception  */ public static String decrypt(String ciphertext, String secureKey) throws Exception {     SecretKeySpec sks = getSecretKeySpec(secureKey);     Cipher decryptCiphe = getCipher(Cipher.DECRYPT_MODE, sks);//initDecryptCipher(secureKey);     byte[] result =  decryptCiphe.doFinal(Base64.decodeBase64(ciphertext));     return new String(result, ENCODEING); }  private static Cipher getCipher(int cipherMode, SecretKeySpec sks) throws Exception{     Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);     cipher.init(cipherMode, sks);     return cipher; }  private static SecretKeySpec getSecretKeySpec(String secureKey) throws Exception{     if(secureKey == null || secureKey.trim().equals("") || secureKey.length() != 16){         throw new Exception("密钥不能为空或密钥长度不对");     }     byte[] raw = secureKey.getBytes(ENCODEING);     SecretKeySpec skeySpec = new SecretKeySpec(raw, ALGORITHM);     return skeySpec; }  /**  * @Comment 加密不限制密码长度  * @Author Ron  * @Date 2017年9月12日 下午3:21:59  * @return  */ public static String encryptNotLimit(String plaintext, String secureKey) throws Exception{     SecretKeySpec sks = getSecretKeySpecByRandomSeed(secureKey);     Cipher encryptCipher = getCipher(Cipher.ENCRYPT_MODE, sks);     byte[] result = encryptCipher.doFinal(plaintext.getBytes(ENCODEING));     return Hex.encodeHexString(result); }  /**  * @Comment 解密不限制密码长度  * @Author Ron  * @Date 2017年9月12日 下午3:22:30  * @return  */ public static String decryptNotLimit(String ciphertext, String secureKey) throws Exception {     SecretKeySpec sks = getSecretKeySpecByRandomSeed(secureKey);     Cipher decryptCiphe = getCipher(Cipher.DECRYPT_MODE, sks);     byte[] result =  decryptCiphe.doFinal(Hex.decodeHex(ciphertext.toCharArray()));     return new String(result, ENCODEING); }  /**  * @Comment 构造私钥  * @Author Ron  * @Date 2017年9月12日 下午3:22:59  * @return  */ private static SecretKeySpec getSecretKeySpecByRandomSeed(String secureKey){     SecretKeySpec sks = null;     try {         KeyGenerator kgen = KeyGenerator.getInstance(ALGORITHM);         //安全随机数生成器          SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");//使用默认的SHA1PRNG算法         secureRandom.setSeed(secureKey.getBytes(ENCODEING));         kgen.init(128, secureRandom);          SecretKey secretKey = kgen.generateKey();         byte[] secretKeyEncoded = secretKey.getEncoded();         sks = new SecretKeySpec(secretKeyEncoded, ALGORITHM);     } catch (Exception e) {         logger.error("",e);     }     return sks; }  public static void main(String[] args) throws Exception {     String key = "ron.zheng@tfscha";     String src = "我是Ron";     String enString = encrypt(src,key);     System.out.println("加密后的数据："+enString);     System.out.println("解密后的数据："+decrypt(enString,key));      //不限制密钥长度     String nkey = "ron.zheng@tfschang.com";     enString = encryptNotLimit(src, nkey);     System.out.println("加密后的数据："+enString);     System.out.println("解密后的数据："+decryptNotLimit(enString,nkey)); } 

}

文章来源: https://blog.csdn.net/weixin_40224981/article/details/97017723