Java sm3加密算法的实现

<!--sm3,sm4加密算法-->
<dependency>
 <groupId>org.bouncycastle</groupId>
 <artifactId>bcprov-jdk15on</artifactId>
 <version>1.66</version>
</dependency> 

import org.bouncycastle.crypto.digests.SM3Digest;
import org.bouncycastle.crypto.macs.HMac;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.pqc.math.linearalgebra.ByteUtils;
import java.io.UnsupportedEncodingException;
import java.security.Security;
import java.util.Arrays;

/**
 * sm3加密算法工具类
 * @explain 加密与加密结果验证（不可逆算法）
 * @author Marydon
 * @creationTime 2018年7月5日上午10:01:24
 * @version 1.0
 * @since
 * @email marydon20170307@163.com
 */
public class Sm3Utils {
 
  private static final String ENCODING = "UTF-8";
  static {
    Security.addProvider(new BouncyCastleProvider());
  }
}　

/**
 * sm3算法加密
 * @explain
 * @param paramStr
 *      待加密字符串
 * @return 返回加密后，固定长度=32的16进制字符串
 */
public static String encrypt(String paramStr){
  // 将返回的hash值转换成16进制字符串
  String resultHexString = "";
  try {
    // 将字符串转换成byte数组
    byte[] srcData = paramStr.getBytes(ENCODING);
    // 调用hash()
    byte[] resultHash = hash(srcData);
    // 将返回的hash值转换成16进制字符串
    resultHexString = ByteUtils.toHexString(resultHash);
  } catch (UnsupportedEncodingException e) {
    e.printStackTrace();
  }
  return resultHexString;
}
 
/**
 * 返回长度=32的byte数组
 * @explain 生成对应的hash值
 * @param srcData
 * @return
 */
public static byte[] hash(byte[] srcData) {
  SM3Digest digest = new SM3Digest();
  digest.update(srcData, 0, srcData.length);
  byte[] hash = new byte[digest.getDigestSize()];
  digest.doFinal(hash, 0);
  return hash;
}

/**
 * 通过密钥进行加密
 * @explain 指定密钥进行加密
 * @param key
 *      密钥
 * @param srcData
 *      被加密的byte数组
 * @return
 */
public static byte[] hmac(byte[] key, byte[] srcData) {
  KeyParameter keyParameter = new KeyParameter(key);
  SM3Digest digest = new SM3Digest();
  HMac mac = new HMac(digest);
  mac.init(keyParameter);
  mac.update(srcData, 0, srcData.length);
  byte[] result = new byte[mac.getMacSize()];
  mac.doFinal(result, 0);
  return result;
}

/**
 * 判断源数据与加密数据是否一致
 * @explain 通过验证原数组和生成的hash数组是否为同一数组，验证2者是否为同一数据
 * @param srcStr
 *      原字符串
 * @param sm3HexString
 *      16进制字符串
 * @return 校验结果
 */
public static boolean verify(String srcStr, String sm3HexString) {
  boolean flag = false;
  try {
    byte[] srcData = srcStr.getBytes(ENCODING);
    byte[] sm3Hash = ByteUtils.fromHexString(sm3HexString);
    byte[] newHash = hash(srcData);
    if (Arrays.equals(newHash, sm3Hash))
      flag = true;
  } catch (UnsupportedEncodingException e) {
    e.printStackTrace();
  }
  return flag;
}　

public static void main(String[] args) {
  // 测试二：json
  String json = "{\"name\":\"Marydon\",\"website\":\"http://www.cnblogs.com/Marydon20170307\"}";
  String hex = Sm3Utils.encrypt(json);
  System.out.println(hex);// 0b0880f6f2ccd817809a432420e42b66d3772dc18d80789049d0f9654efeae5c
  // 验证加密后的16进制字符串与加密前的字符串是否相同
  boolean flag = Sm3Utils.verify(json, hex);
  System.out.println(flag);// true

}