AES加密解密

秒速五厘米 2022-05-28 04:58 320阅读 0赞

package com.lanhuigu.encryptdecrypt;
    
    import org.apache.commons.codec.binary.Base64;
    
    import javax.crypto.Cipher;
    import javax.crypto.KeyGenerator;
    import javax.crypto.SecretKey;
    import javax.crypto.spec.SecretKeySpec;
    import java.security.NoSuchAlgorithmException;
    import java.security.SecureRandom;
    import java.util.logging.Level;
    import java.util.logging.Logger;
    
    /**
     * @ClassName: AESUtil
     * @Package: com.lanhuigu.encryptdecrypt
     * @date 2018/3/29 20:20
     * @version 1.0.0
     */
    public class AESUtil {
        private static final String KEY_ALGORITHM = "AES";
        /** 默认的加密算法 */
        private static final String DEFAULT_CIPHER_ALGORITHM = "AES/ECB/PKCS5Padding";
    
        /**
         * AES加密
         * @date 2018/3/29 20:23
         * @params content   待加密内容，即明文
         * @params password  加密密码
         * @return String    返回Base64转码后的加密数据
         * @throws
         * @since 1.0.0
         */
        public static String encrypt(String content, String password) {
            try {
                // 创建密码器
                Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);
                byte[] byteContent = content.getBytes("utf-8");
    
                // 初始化为加密模式的密码器
                cipher.init(Cipher.ENCRYPT_MODE, getSecretKey(password));
    
                // 加密
                byte[] result = cipher.doFinal(byteContent);
    
                //通过Base64转码返回
                return Base64.encodeBase64String(result);
            } catch (Exception ex) {
                Logger.getLogger(AESUtil.class.getName()).log(Level.SEVERE, null, ex);
            }
    
            return null;
        }
    
        /**
         * AES解密
         * @date 2018/3/29 20:27
         * @params content   密文
         * @params password  解密密码
         * @return String    返回解码后的明文
         * @throws 
         * @since 1.0.0
         */
        public static String decrypt(String content, String password) {
            try {
                // 实例化
                Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);
    
                // 使用密钥初始化，设置为解密模式
                cipher.init(Cipher.DECRYPT_MODE, getSecretKey(password));
    
                // 执行操作
                byte[] result = cipher.doFinal(Base64.decodeBase64(content));
    
                // 以UTF-8方式返回明文
                return new String(result, "utf-8");
            } catch (Exception ex) {
                Logger.getLogger(AESUtil.class.getName()).log(Level.SEVERE, null, ex);
            }
    
            return null;
        }
    
        /**
         * 生成加密密钥
         * @date 2018/3/29 20:30
         * @params password 密码
         * @return 加密密钥
         * @throws
         * @since 1.0.0
         */
        private static SecretKeySpec getSecretKey(final String password) {
            // 返回生成指定算法密钥生成器的KeyGenerator对象
            KeyGenerator kg = null;
            try {
                kg = KeyGenerator.getInstance(KEY_ALGORITHM);
    
                // AES要求密钥长度为128
                kg.init(128, new SecureRandom(password.getBytes()));
    
                // 生成一个密钥
                SecretKey secretKey = kg.generateKey();
    
                // 转换为AES专用密钥
                return new SecretKeySpec(secretKey.getEncoded(), KEY_ALGORITHM);
            } catch (NoSuchAlgorithmException ex) {
                Logger.getLogger(AESUtil.class.getName()).log(Level.SEVERE, null, ex);
            }
    
            return null;
        }
    
        public static void main(String[] args) {
            String str = "hello,您好啊!";
            String secretKeySpec = "123456";
            System.out.println("加密前的内容:" + str);
    
            String encryptStr = AESUtil.encrypt(str, secretKeySpec);
            System.out.println("加密后的内容:" + encryptStr);
    
            String decryptStr = AESUtil.decrypt(encryptStr, secretKeySpec);
            System.out.println("解密后的内容:" + decryptStr);
    
    
        }
    }