Java sm3加密算法的实现

1.准备工作

　　所需jar包：

　　bcprov-jdk15on-1.59.jar
　　commons-lang3-3.1.jar

　　对应的maven依赖

 org.bouncycastle
 bcprov-jdk15on
 1.66
 

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;

public class Sm3Utils {
 
  private static final String ENCODING = "UTF-8";
  static {
    Security.addProvider(new BouncyCastleProvider());
  }
}　

2.SM3加密

　　方式一：不提供密钥

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;
}
 

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;
}

　　方式二：自定义密钥

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;
}

3.加密数据校验

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;
}　

4.测试

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

}

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