作业1

SM2加解密内容：

package chenchen;

import org.bouncycastle.crypto.engines.SM2Engine;
import org.bouncycastle.crypto.params.*;
import org.bouncycastle.jcajce.provider.asymmetric.ec.BCECPrivateKey;
import org.bouncycastle.jcajce.provider.asymmetric.ec.BCECPublicKey;
import org.bouncycastle.jce.spec.ECParameterSpec;
import org.bouncycastle.util.encoders.Hex;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
public class SM2Util {
/**
* SM2加密算法
* @param publicKey 公钥
* @param data 明文数据
* @return
*/
public String encrypt(PublicKey publicKey, String data) {
   ECPublicKeyParameters ecPublicKeyParameters = null;
   if (publicKey instanceof BCECPublicKey) {
   BCECPublicKey bcecPublicKey = (BCECPublicKey) publicKey;
   ECParameterSpec ecParameterSpec = bcecPublicKey.getParameters();
   ECDomainParameters ecDomainParameters = new ECDomainParameters(ecParameterSpec.getCurve(),ecParameterSpec.getG(), ecParameterSpec.getN());
   ecPublicKeyParameters = new ECPublicKeyParameters(bcecPublicKey.getQ(),ecDomainParameters);
   }
   SM2Engine sm2Engine = new SM2Engine();
   sm2Engine.init(true, new ParametersWithRandom(ecPublicKeyParameters, new SecureRandom()));byte[] arrayOfBytes = null;
   try {
   byte[] in = data.getBytes("UTF8");
   arrayOfBytes = sm2Engine.processBlock(in,0, in.length);
   } catch (Exception e) {
   System.out.println("SM2加密时出现异常:");
   }
   return Hex.toHexString(arrayOfBytes);
}
/**
* SM2解密算法
* @param privateKey 私钥
* @param cipherData 密文数据
* @return
*/
public String decrypt(PrivateKey privateKey, String cipherData) {
   byte[] cipherDataByte = Hex.decode(cipherData);
   BCECPrivateKey bcecPrivateKey = (BCECPrivateKey) privateKey;
   ECParameterSpec ecParameterSpec = bcecPrivateKey.getParameters();
   ECDomainParameters ecDomainParameters = new ECDomainParameters(ecParameterSpec.getCurve(),ecParameterSpec.getG(), ecParameterSpec.getN());
   ECPrivateKeyParameters ecPrivateKeyParameters = new ECPrivateKeyParameters(bcecPrivateKey.getD(),ecDomainParameters);
   SM2Engine sm2Engine = new SM2Engine();
   sm2Engine.init(false, ecPrivateKeyParameters);
   String result = null;
   try {
   byte[] arrayOfBytes = sm2Engine.processBlock(cipherDataByte, 0,
   cipherDataByte.length);
   return new String(arrayOfBytes, "UTF8");
   } catch (Exception e) {
   System.out.println("SM2解密时出现异常");
   }
   return result;
  }
}

package chenchen;

import org.bouncycastle.jce.provider.BouncyCastleProvider;
import java.security.*;
import java.security.spec.ECGenParameterSpec;
public class sm2_demo {
   private static String M="20181217cindy_SM2_demo";
   public static void main(String[] args) throws NoSuchAlgorithmException,
   InvalidAlgorithmParameterException {
   SM2Util sm2 = new SM2Util();
   final ECGenParameterSpec sm2Spec = new ECGenParameterSpec("sm2p256v1");
   // 获取一个椭圆曲线类型的密钥对生成器
   final KeyPairGenerator kpg = KeyPairGenerator.getInstance("EC", new BouncyCastleProvider());
   // 使用SM2参数初始化生成器
   kpg.initialize(sm2Spec);
   // 获取密钥对
   KeyPair keyPair = kpg.generateKeyPair();
   PublicKey publicKey = keyPair.getPublic();
   PrivateKey privateKey = keyPair.getPrivate();
   String data = sm2.encrypt(publicKey,M);
   System.out.println("明文: "+ M);
   System.out.println("密文:"+ data);
   String text=sm2.decrypt(privateKey,data);
   System.out.println("解密结果:"+ text);
   
   }
}

 sm3哈希算法：

package chenchen;

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 java.security.*;
import java.util.Arrays;
import javax.xml.bind.DatatypeConverter;

public class SM3Util {
public static void main(String[] args) throws NoSuchAlgorithmException {

BouncyCastleProvider provider = new BouncyCastleProvider();

byte[] word = "20181217cindy".getBytes();
MessageDigest digest = MessageDigest.getInstance("SM3", provider);
byte[] word1 = digest.digest(word);
String word2 = DatatypeConverter.printHexBinary(word1);
System.out.printf("sm3: %s ", word2);

}
}

package chenchen;


import java.security.AlgorithmParameters;  
import java.security.Key;  
import java.security.Security;  
import java.util.Arrays;  
  
import javax.crypto.Cipher;  
import javax.crypto.KeyGenerator;  
import javax.crypto.SecretKey;  
import javax.crypto.spec.IvParameterSpec;  
import javax.crypto.spec.SecretKeySpec;  
  
  
public class SM4Util{  
      
    //算法名  
    public static final String KEY_ALGORITHM = "SM4";  
    //加解密算法/模式/填充方式  
    //可以任意选择，为了方便后面与iOS端的加密解密，采用与其相同的模式与填充方式  
    //ECB模式只用密钥即可对数据进行加密解密，CBC模式需要添加一个参数iv  
    public static final String CIPHER_ALGORITHM = "SM4/CBC/PKCS7Padding";  
  
    //生成密钥  
    public static byte[] generateKey() throws Exception{  
        Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());  
        KeyGenerator keyGenerator = KeyGenerator.getInstance(KEY_ALGORITHM);  
        keyGenerator.init(128);  
        SecretKey key = keyGenerator.generateKey();  
        return key.getEncoded();  
    }  
      
    //生成iv  
    public static AlgorithmParameters generateIV() throws Exception{  
        //iv 为一个 16 字节的数组，这里采用和 iOS 端一样的构造方法，数据全为0  
        byte[] iv = new byte[16];  
        Arrays.fill(iv, (byte) 0x00);  
        AlgorithmParameters params = AlgorithmParameters.getInstance(KEY_ALGORITHM);  
        params.init(new IvParameterSpec(iv));  
        return params;  
    }  
      
    //转化成JAVA的密钥格式  
    public static Key convertToKey(byte[] keyBytes) throws Exception{  
        SecretKey secretKey = new SecretKeySpec(keyBytes,KEY_ALGORITHM);  
        return secretKey;  
    }  
      
    //加密  
    public static byte[] encrypt(byte[] data,byte[] keyBytes,AlgorithmParameters iv) throws Exception {  
        //转化为密钥  
        Key key = convertToKey(keyBytes);  
        Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());  
        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);  
        //设置为加密模式  
        cipher.init(Cipher.ENCRYPT_MODE, key,iv);  
        return cipher.doFinal(data);  
    }  
      
    //解密  
    public static byte[] decrypt(byte[] encryptedData,byte[] keyBytes,AlgorithmParameters iv) throws Exception{  
        Key key = convertToKey(keyBytes);  
        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);  
        //设置为解密模式  
        cipher.init(Cipher.DECRYPT_MODE, key,iv);  
        return cipher.doFinal(encryptedData);  
    }  
      
    public static void main(String[] args) {  
        //明文  
        String plainTextString = "20181217";  
        System.out.println("明文 : "+plainTextString);  
        byte[] key;  
        try {  
            //初始化密钥  
            key = generateKey();  
            //初始化iv  
            AlgorithmParameters iv = generateIV();  
            System.out.println("密钥 : ");  
            //打印密钥  
            for (int i = 0; i < key.length; i++) {  
                System.out.printf("%x", key[i]);  
            }  
            System.out.println();  
              
            //进行加密  
            byte[] encryptedData = encrypt(plainTextString.getBytes(), key,iv);  
            //输出加密后的数据  
            System.out.println("加密后的数据 : ");  
            for (int i = 0; i < encryptedData.length; i++) {  
                System.out.printf("%x", encryptedData[i]);  
            }  
            System.out.println();  
              
            //进行解密  
            byte[] data = decrypt(encryptedData, key,iv);  
            System.out.println("解密得到的数据 : " + new String(data));  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
  
    }  
  
}