Java实现AES算法

　　使用AES算法可用于对数据进行加密码与解密，使用的时候需要注意两点：1）被加密的串越长，加密后的字符串越长，注意数据库字段的设计；2）Linux与Windows环境中可能会出现由于环境差异导致在Windows中测试成功，到Linux上后加密的串无法被正确解密。下列算法已在真实环境中进行实测，应用时也务必做好二次验证避免出现线上事故。

private static final String ALGORITHM_NAME = "AES";
　　 //加密因子，可根据您的需要自定义
private static final String DEFAULT_ENCRYPT_RULE = "AES/CBC/PKCS5Padding";
private static final String RANDOM_KEY_ALGORITHM = "SHA1PRNG";
private static final String RANDOM_KEY_ALGORITHM_PROVIDER = "SUN";

/**
* AES加密
* @param content 待加密的内容，为空时为回空
* @return 加密后的base64格式的结果，出现异常时返回null
*/
public static String encrypt(String content) {
if (StringUtils.isEmpty(content)) {
return null;
}
try {
KeyGenerator keyGenerator = KeyGenerator.getInstance(ALGORITHM_NAME);
SecureRandom secureRandom = SecureRandom.getInstance(RANDOM_KEY_ALGORITHM, RANDOM_KEY_ALGORITHM_PROVIDER);
secureRandom.setSeed(DEFAULT_ENCRYPT_RULE.getBytes());
keyGenerator.init(128, secureRandom);
SecretKey originalKey = keyGenerator.generateKey();
SecretKey secretKey = new SecretKeySpec(originalKey.getEncoded(), ALGORITHM_NAME);
Cipher cipher = Cipher.getInstance(ALGORITHM_NAME);
cipher.init(Cipher.ENCRYPT_MODE, secretKey);
byte[] encrypted = cipher.doFinal(content.getBytes("utf-8"));
String result = new String(Base64.getEncoder().encodeToString(encrypted));
return  result;
} catch (Exception e) {
logger.error(e.getMessage(), e);
return null;
}
}

/**
* 解密
* @param encrypted 加密后的base64格式的密文
* @return 解密后的原文，出现异常时返回null
*/
public static String decrypt(String encrypted) {
if (StringUtils.isEmpty(encrypted)) {
return null;
}
try {
KeyGenerator keyGenerator = KeyGenerator.getInstance(ALGORITHM_NAME);
SecureRandom secureRandom = SecureRandom.getInstance(RANDOM_KEY_ALGORITHM, RANDOM_KEY_ALGORITHM_PROVIDER);
secureRandom.setSeed(DEFAULT_ENCRYPT_RULE.getBytes());
keyGenerator.init(128, secureRandom);
SecretKey originalKey = keyGenerator.generateKey();
SecretKey secretKey = new SecretKeySpec(originalKey.getEncoded(), ALGORITHM_NAME);
Cipher cipher = Cipher.getInstance(ALGORITHM_NAME);
cipher.init(Cipher.DECRYPT_MODE, secretKey);
byte[] decrypted = cipher.doFinal(Base64.getDecoder().decode(encrypted));
return new String(decrypted, "utf-8");
} catch (Exception e) {
logger.error(e.getMessage(), e);
return null;
}
}