Java实现aes加解密

系统管理员 2022-09-02 12:47 110阅读 0赞

pom文件的依赖

<dependency>
    	<groupId>org.apache.commons</groupId>
    	<artifactId>commons-lang3</artifactId>
    	<version>3.4</version>
    </dependency>
    
    <dependency>
    	<groupId>commons-codec</groupId>
    	<artifactId>commons-codec</artifactId>
    	<version>1.8</version>
    </dependency>

Java代码

package com.xxl.job.admin.util;
    
    import org.apache.commons.codec.binary.Base64;
    import org.apache.commons.lang3.StringUtils;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import sun.misc.BASE64Decoder;
    
    import javax.crypto.Cipher;
    import javax.crypto.KeyGenerator;
    import javax.crypto.spec.SecretKeySpec;
    import java.nio.charset.StandardCharsets;
    
    /** * aes加解密工具类 * * @author liHu * @version 1.0 * @date 2021/8/3 10:48 * @since JDK 1.8 */
    public class EncryptAesUtil { 
        private static Logger logger = LoggerFactory.getLogger(EncryptAesUtil.class);
        /** * 密钥 AES加解密要求key必须要128个比特位（这里需要长度为16，否则会报错） */
        private static final String KEY = "xxl_job_12345678";
    
        /** * 算法 */
        private static final String ALGORITHMS = "AES/ECB/PKCS5Padding";
        /** * 静态常量 */
        private static final String AES = "AES";
    
        public static void main(String[] args) { 
            logger.info("加密密钥和解密密钥：{}", KEY);
    
            String content = "SBAZCSJYBAGDYQDF";
            logger.info("加密前：" + content);
    
            String encrypt = aesEncrypt(content);
            logger.info("加密后：" + encrypt);
    
            String decrypt = aesDecrypt(encrypt);
            logger.info("解密后：" + decrypt);
        }
    
        /** * 将字符串【AES加密】为base 64 code * * @param content 待加密的内容 * @return 加密后的base 64 code */
        public static String aesEncrypt(String content) { 
            try { 
                // 创建密码器
                KeyGenerator kgen = KeyGenerator.getInstance("AES");
                kgen.init(128);
                // 初始化为加密模式的密码器
                Cipher cipher = Cipher.getInstance(ALGORITHMS);
                cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(EncryptAesUtil.KEY.getBytes(), EncryptAesUtil.AES));
    
                byte[] bytes = cipher.doFinal(content.getBytes(StandardCharsets.UTF_8));
                // 使用base64解码
                return Base64.encodeBase64String(bytes);
            } catch (Exception e) { 
                logger.error(e.getMessage() + e);
            }
            return null;
        }
    
        /** * 将base 64 code 【AES解密】为字符串 * * @param encryptStr 待解密的base 64 code * @return 解密后的String */
        public static String aesDecrypt(String encryptStr) { 
            try { 
                if (StringUtils.isEmpty(encryptStr)) { 
                    return null;
                }
                // 将字符串转为byte，返回解码后的byte[]
                byte[] encryptBytes = new BASE64Decoder().decodeBuffer(encryptStr);
    
                // 创建密码器
                KeyGenerator kgen = KeyGenerator.getInstance(EncryptAesUtil.AES);
                kgen.init(128);
                // 初始化为解密模式的密码器
                Cipher cipher = Cipher.getInstance(ALGORITHMS);
                cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(EncryptAesUtil.KEY.getBytes(), EncryptAesUtil.AES));
                byte[] decryptBytes = cipher.doFinal(encryptBytes);
    
                return new String(decryptBytes);
            } catch (Exception e) { 
                logger.error(e.getMessage() + e);
            }
            return null;
        }
    }