SM4加密解密

SM4加密解密

maven项目引入以下依赖

 		<dependency>
            <groupId>org.bouncycastle</groupId>
            <artifactId>bcprov-jdk15on</artifactId>
            <version>1.59</version>
        </dependency>

package com;


import java.security.Key;
import java.security.Security;
import java.util.Arrays;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.pqc.math.linearalgebra.ByteUtils;

public class Sm4Util {

	  static {
	        Security.addProvider(new BouncyCastleProvider());
	    }
	    private static final String ENCODING = "UTF-8";
	    public static final String ALGORITHM_NAME = "SM4";
	    // PKCS5Padding  NoPadding 补位规则，PKCS5Padding缺位补0，NoPadding不补
	    public static final String ALGORITHM_NAME_ECB_PADDING = "SM4/ECB/PKCS5Padding";
	 
	    /**
	     * ECB加密模式，无向量
	     * @explain ECB
	     * @param algorithmName
	     * @param mode
	     * @param key
	     * @return
	     * @throws Exception
	     */
	    private static Cipher generateEcbCipher(String algorithmName, int mode, byte[] key) throws Exception {
	        Cipher cipher = Cipher.getInstance(algorithmName, BouncyCastleProvider.PROVIDER_NAME);
	        Key sm4Key = new SecretKeySpec(key, ALGORITHM_NAME);
	        cipher.init(mode, sm4Key);
	        return cipher;
	    }
	    /**
	     * sm4加密
	     * @explain 加密模式：ECB 密文长度不固定，会随着被加密字符串长度的变化而变化
	     * @param hexKey 16进制**（忽略大小写）
	     * @param paramStr 待加密字符串
	     * @return 返回16进制的加密字符串
	     * @throws Exception
	     */
	    public static String encryptEcb(String hexKey, String paramStr) throws Exception {
	        String cipherText = "";
	        // 16进制字符串-->byte[]
	        byte[] keyData = ByteUtils.fromHexString(hexKey);
	        // String-->byte[]
	        //当加密数据为16进制字符串时使用这行
//	        byte[] srcData = ByteUtils.fromHexString(hexKey);
	        byte[] srcData = paramStr.getBytes(ENCODING);
	        // 加密后的数组
	        byte[] cipherArray = encrypt_Ecb_Padding(keyData, srcData);
	        // byte[]-->hexString
	        cipherText = ByteUtils.toHexString(cipherArray);
	        return cipherText;
	    }
	 
	    /**
	     * 加密模式之Ecb
	     * @param key
	     * @param data
	     * @return
	     * @throws Exception
	     */
	    public static byte[] encrypt_Ecb_Padding(byte[] key, byte[] data) throws Exception {
	        Cipher cipher = generateEcbCipher(ALGORITHM_NAME_ECB_PADDING, Cipher.ENCRYPT_MODE, key);//声称Ecb暗号,通过第二个参数判断加密还是解密
	        return cipher.doFinal(data);
	    }
	 
	    //解密****************************************
	    /**
	     * sm4解密
	     * @explain 解密模式：采用ECB
	     * @param hexKey 16进制**
	     * @param cipherText 16进制的加密字符串（忽略大小写）
	     * @return 解密后的字符串
	     * @throws Exception
	     */
	    public static String decryptEcb(String hexKey, String cipherText) throws Exception {
	        // 用于接收解密后的字符串
	        String decryptStr = "";
	        // hexString-->byte[]
	        byte[] keyData = ByteUtils.fromHexString(hexKey);
	        // hexString-->byte[]
	        byte[] cipherData = ByteUtils.fromHexString(cipherText);
	        // 解密
	        byte[] srcData = decrypt_Ecb_Padding(keyData, cipherData);
	        // byte[]-->String
	        decryptStr = new String(srcData, ENCODING);
	        return decryptStr;
	    }
	 
	    /**
	     * 解密
	     * @explain
	     * @param key
	     * @param cipherText
	     * @return
	     * @throws Exception
	     */
	    public static byte[] decrypt_Ecb_Padding(byte[] key, byte[] cipherText) throws Exception {
	        Cipher cipher = generateEcbCipher(ALGORITHM_NAME_ECB_PADDING, Cipher.DECRYPT_MODE, key);//生成Ecb暗号,通过第二个参数判断加密还是解密
	        return cipher.doFinal(cipherText);
	    }
	    public static boolean verifyEcb(String hexKey, String cipherText, String paramStr) throws Exception {
	        // 用于接收校验结果
	        boolean flag = false;
	        // hexString-->byte[]
	        byte[] keyData = ByteUtils.fromHexString(hexKey);
	        // 将16进制字符串转换成数组
	        byte[] cipherData = ByteUtils.fromHexString(cipherText);
	        // 解密
	        byte[] decryptData = decrypt_Ecb_Padding(keyData, cipherData);
	        // 将原字符串转换成byte[]
	        byte[] srcData = paramStr.getBytes(ENCODING);
	        // 判断2个数组是否一致
	        flag = Arrays.equals(decryptData, srcData);
	        return flag;
	    }

	    public static void main(String[] args) {
	        try {
	            System.out.println("开始****************************");
	            String json = "86C63180C2806ED1F47B859DE501215B";
	            System.out.println("加密前："+json);
	            //自定义的32位16进制秘钥
	            String key = "86C63180C2806ED1F47B859DE501215B";
	            String cipher = encryptEcb(key,json);//sm4加密
	            System.out.println("加密后："+cipher);
	            System.out.println("校验："+verifyEcb(key,cipher,json));//校验加密前后是否为同一数据
	            json =decryptEcb(key,cipher);//解密
	            System.out.println("解密后："+json);
	            System.out.println("结束****************************");
	        } catch (Exception e) {
	            e.printStackTrace();
	        }
	 
	    }

}

结果

开始****************************
加密前：86C63180C2806ED1F47B859DE501215B
加密后：0f196060b706500cc9b88d22cee33fd67d0aa493d2a80a72396771b5585a49f81642326904c036af50b50f92e86cb274
校验：true
解密后：86C63180C2806ED1F47B859DE501215B
结束****************************

JAR包地址
链接：https://pan.baidu.com/s/1mU6WXEWlV_Kbz_OeEAqAPA
提取码：1ktn