AES前端加密，后端Java解密

短命女 2022-11-20 10:59 225阅读 0赞

1、前端实现

结果：  
![在这里插入图片描述][20201028173204165.png_pic_center]  
2、后端实现

import java.io.UnsupportedEncodingException;
    import java.nio.charset.Charset;
    import java.security.InvalidAlgorithmParameterException;
    import java.security.InvalidKeyException;
    import java.security.NoSuchAlgorithmException;
    
    import javax.crypto.BadPaddingException;
    import javax.crypto.Cipher;
    import javax.crypto.IllegalBlockSizeException;
    import javax.crypto.KeyGenerator;
    import javax.crypto.NoSuchPaddingException;
    import javax.crypto.SecretKey;
    import javax.crypto.spec.IvParameterSpec;
    import javax.crypto.spec.SecretKeySpec;
    
    public class AES { 
    
        private static String iv = "0123456789ABCDEF";//偏移量字符串必须是16位 当模式是CBC的时候必须设置偏移量
        private static String Algorithm = "AES";
        private static String AlgorithmProvider = "AES/ECB/PKCS5Padding"; // 算法/模式/补码方式
    
        public static byte[] generatorKey() throws NoSuchAlgorithmException { 
            KeyGenerator keyGenerator = KeyGenerator.getInstance(Algorithm);
            keyGenerator.init(256);//默认128，获得无政策权限后可为192或256
            SecretKey secretKey = keyGenerator.generateKey();
            return secretKey.getEncoded();
        }
    
        public static IvParameterSpec getIv() throws UnsupportedEncodingException { 
            IvParameterSpec ivParameterSpec = new IvParameterSpec(iv.getBytes("utf-8"));
            System.out.println("偏移量："+byteToHexString(ivParameterSpec.getIV()));
            return ivParameterSpec;
        }
    
        public static byte[] encrypt(String src, byte[] key) throws NoSuchAlgorithmException, NoSuchPaddingException,
                InvalidKeyException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException, InvalidAlgorithmParameterException { 
            SecretKey secretKey = new SecretKeySpec(key, Algorithm);
            //IvParameterSpec ivParameterSpec = getIv();
            Cipher cipher = Cipher.getInstance(AlgorithmProvider);
            cipher.init(Cipher.ENCRYPT_MODE, secretKey);
            byte[] cipherBytes = cipher.doFinal(src.getBytes(Charset.forName("utf-8")));
            return cipherBytes;
        }
    
        public static byte[] decrypt(String src, byte[] key) throws Exception { 
            SecretKey secretKey = new SecretKeySpec(key, Algorithm);
    
            //IvParameterSpec ivParameterSpec = getIv();
            Cipher cipher = Cipher.getInstance(AlgorithmProvider);
            cipher.init(Cipher.DECRYPT_MODE, secretKey);
            byte[] hexBytes = hexStringToBytes(src);
            byte[] plainBytes = cipher.doFinal(hexBytes);
            return plainBytes;
        }
    
        /** * 将byte转换为16进制字符串 * @param src * @return */
        public static String byteToHexString(byte[] src) { 
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < src.length; i++) { 
                int v = src[i] & 0xff;
                String hv = Integer.toHexString(v);
                if (hv.length() < 2) { 
                    sb.append("0");
                }
                sb.append(hv);
            }
            return sb.toString();
        }
    
        /** * 将16进制字符串装换为byte数组 * @param hexString * @return */
        public static byte[] hexStringToBytes(String hexString) { 
            hexString = hexString.toUpperCase();
            int length = hexString.length() / 2;
            char[] hexChars = hexString.toCharArray();
            byte[] b = new byte[length];
            for (int i = 0; i < length; i++) { 
                int pos = i * 2;
                b[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
            }
            return b;
        }
    
        private static byte charToByte(char c) { 
            return (byte) "0123456789ABCDEF".indexOf(c);
        }
    
        public static void main(String[] args) { 
            try { 
                // byte key[] = generatorKey();
                // 密钥必须是16的倍数
                byte key[] = "1234567890ABCDEF1234567890ABCDEf".getBytes("utf-8");//hexStringToBytes("0123456789ABCDEF");
                String src = "werty7890";
                System.out.println("密钥:"+byteToHexString(key));
                System.out.println("原字符串:"+src);
    
                String enc = byteToHexString(encrypt(src, key));
                System.out.println("加密："+enc);
                System.out.println("解密："+new String(decrypt(enc, key), "utf-8"));
            } catch (InvalidKeyException e) { 
                e.printStackTrace();
            } catch (NoSuchAlgorithmException e) { 
                e.printStackTrace();
            } catch (NoSuchPaddingException e) { 
                e.printStackTrace();
            } catch (IllegalBlockSizeException e) { 
                e.printStackTrace();
            } catch (BadPaddingException e) { 
                e.printStackTrace();
            } catch (UnsupportedEncodingException e) { 
                e.printStackTrace();
            } catch (Exception e) { 
                e.printStackTrace();
            }
        }
    }

![在这里插入图片描述][20201028173235968.png_pic_center]

[20201028173204165.png_pic_center]: /images/20221120/0af3bf40aabc40e0811e68cde94b4262.png
[20201028173235968.png_pic_center]: /images/20221120/e2fcd3d5b91042e190bf95fd29002934.png