Java AES加密解密算法工具类

谁践踏了优雅 2021-09-24 01:00 479阅读 0赞

import org.apache.commons.codec.binary.Base64;
    import org.apache.commons.lang.StringUtils;
    import sun.misc.BASE64Decoder;
    
    import javax.crypto.Cipher;
    import javax.crypto.KeyGenerator;
    import javax.crypto.spec.SecretKeySpec;
    import java.math.BigInteger;
    
    /** * @author xzy * @description * @date 2020/3/18 * @modified */
    public class AES { 
        //密钥
        private static final String KEY = "no0pilzmlrcqmzby";
        //算法
        private static final String ALGORITHMSTR = "AES/ECB/PKCS5Padding";
    
        /** * aes解密 * @param encrypt 内容 * @return * @throws Exception */
        public static String aesDecrypt(String encrypt) { 
            try { 
                return aesDecrypt(encrypt, KEY);
            } catch (Exception e) { 
                e.printStackTrace();
                return "";
            }
        }
    
        /** * aes加密 * @param content * @return * @throws Exception */
        public static String aesEncrypt(String content) { 
            try { 
                return aesEncrypt(content, KEY);
            } catch (Exception e) { 
                e.printStackTrace();
                return "";
            }
        }
    
        /** * 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 Base64.encodeBase64String(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 StringUtils.isEmpty(base64Code) ? null : new BASE64Decoder().decodeBuffer(base64Code);
        }
    
    
        /** * 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);
            Cipher cipher = Cipher.getInstance(ALGORITHMSTR);
            cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(encryptKey.getBytes(), "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);
    
            Cipher cipher = Cipher.getInstance(ALGORITHMSTR);
            cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(decryptKey.getBytes(), "AES"));
            byte[] decryptBytes = cipher.doFinal(encryptBytes);
            return new String(decryptBytes, "UTF-8");
        }
    
    
        /** * 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 StringUtils.isEmpty(encryptStr) ? null : aesDecryptByBytes(base64Decode(encryptStr), decryptKey);
        }
    
        /** * 测试 */
        public static void main(String[] args) throws Exception { 
            String content = "123";
            System.out.println("加密前：" + content);
            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);
        }
    }