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   源码介绍

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由于很多同学想做伸手党，此处重新上传了一个完整版的代码。包含了生成随机秘钥对，数据加密，数据解密，签名与验签例子，并给出了使用姿势。使用者需要使用maven导入项目，然后运行SM2Utils里面的main方法即可

package com.test;

import org.bouncycastle.asn1.*;
import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
import org.bouncycastle.crypto.digests.SM3Digest;
import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.math.ec.ECPoint;
import org.bouncycastle.util.encoders.Base64;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.math.BigInteger;

import java.util.Enumeration;

public class SM2Utils {
    public SM2Utils() {
    }

    /**
     * 生成随机秘钥对
     */
    public MyKeyPair generateKeyPair() {
        SM2 sm2 = SM2.Instance();
        AsymmetricCipherKeyPair key = sm2.ecc_key_pair_generator.generateKeyPair();
        ECPrivateKeyParameters ecpriv = (ECPrivateKeyParameters) key.getPrivate();
        ECPublicKeyParameters ecpub = (ECPublicKeyParameters) key.getPublic();
        BigInteger privateKey = ecpriv.getD();
        org.bouncycastle.math.ec.ECPoint publicKey = ecpub.getQ();
        SM2Utils.MyKeyPair myKeyPair = new SM2Utils.MyKeyPair();
        myKeyPair.setPrivateKey(Util.byteToHex(privateKey.toByteArray()));
        myKeyPair.setPublicKey(Util.byteToHex(publicKey.getEncoded()));

        return myKeyPair;
    }

    /**
     * 数据加密
     * @param publicKey
     * @param data
     * @return
     * @throws IOException
     */
    public static byte[] encrypt(byte[] publicKey, byte[] data) throws IOException {
        if (publicKey != null && publicKey.length != 0) {
            if (data != null && data.length != 0) {
                byte[] source = new byte[data.length];
                System.arraycopy(data, 0, source, 0, data.length);
                Cipher cipher = new Cipher();
                SM2 sm2 = SM2.Instance();
                org.bouncycastle.math.ec.ECPoint userKey = sm2.ecc_curve.decodePoint(publicKey);
                org.bouncycastle.math.ec.ECPoint c1 = cipher.Init_enc(sm2, userKey);
                cipher.Encrypt(source);
                byte[] c3 = new byte[32];
                cipher.Dofinal(c3);
                DERInteger x = new DERInteger(c1.getX().toBigInteger());
                DERInteger y = new DERInteger(c1.getY().toBigInteger());
                DEROctetString derDig = new DEROctetString(c3);
                DEROctetString derEnc = new DEROctetString(source);
                ASN1EncodableVector v = new ASN1EncodableVector();
                v.add(x);
                v.add(y);
                v.add(derDig);
                v.add(derEnc);
                DERSequence seq = new DERSequence(v);
                ByteArrayOutputStream bos = new ByteArrayOutputStream();
                DEROutputStream dos = new DEROutputStream(bos);
                dos.writeObject(seq);
                return bos.toByteArray();
            } else {
                return null;
            }
        } else {
            return null;
        }
    }

    /**
     * 数据解密
     * @param privateKey
     * @param encryptedData
     * @return
     * @throws IOException
     */
    public static byte[] decrypt(byte[] privateKey, byte[] encryptedData) throws IOException {
        if (privateKey != null && privateKey.length != 0) {
            if (encryptedData != null && encryptedData.length != 0) {
                byte[] enc = new byte[encryptedData.length];
                System.arraycopy(encryptedData, 0, enc, 0, encryptedData.length);
                SM2 sm2 = SM2.Instance();
                BigInteger userD = new BigInteger(1, privateKey);
                ByteArrayInputStream bis = new ByteArrayInputStream(enc);
                ASN1InputStream dis = new ASN1InputStream(bis);
                ASN1Primitive derObj = dis.readObject();
                ASN1Sequence asn1 = (ASN1Sequence)derObj;
                ASN1Integer x = (ASN1Integer)asn1.getObjectAt(0);
                ASN1Integer y = (ASN1Integer)asn1.getObjectAt(1);
                org.bouncycastle.math.ec.ECPoint c1 = sm2.ecc_curve.createPoint(x.getValue(), y.getValue(), true);
                Cipher cipher = new Cipher();
                cipher.Init_dec(userD, c1);
                DEROctetString data = (DEROctetString)asn1.getObjectAt(3);
                enc = data.getOctets();
                cipher.Decrypt(enc);
                byte[] c3 = new byte[32];
                cipher.Dofinal(c3);
                return enc;
            } else {
                return null;
            }
        } else {
            return null;
        }
    }

    /**
     * 签名
     * @param userId
     * @param privateKey
     * @param sourceData
     * @return
     * @throws IOException
     */
    public static byte[] sign(byte[] userId, byte[] privateKey, byte[] sourceData) throws IOException {
        if (privateKey != null && privateKey.length != 0) {
            if (sourceData != null && sourceData.length != 0) {
                SM2 sm2 = SM2.Instance();
                BigInteger userD = new BigInteger(privateKey);
                org.bouncycastle.math.ec.ECPoint userKey = sm2.ecc_point_g.multiply(userD);
                byte[] z = sm2.sm2GetZ(userId, userKey);
                SM3Digest sm3 = new SM3Digest();
                sm3.update(z, 0, z.length);
                sm3.update(sourceData, 0, sourceData.length);
                byte[] md = new byte[32];
                sm3.doFinal(md, 0);
                SM2Result sm2Result = new SM2Result();
                sm2.sm2Sign(md, userD, userKey, sm2Result);
                DERInteger d_r = new DERInteger(sm2Result.r);
                DERInteger d_s = new DERInteger(sm2Result.s);
                ASN1EncodableVector v2 = new ASN1EncodableVector();
                v2.add(d_r);
                v2.add(d_s);
                DERSequence sign = new DERSequence(v2);
                byte[] signdata = sign.getEncoded();
                return signdata;
            } else {
                return null;
            }
        } else {
            return null;
        }
    }

    /**
     * 验签
     * @param userId
     * @param publicKey
     * @param sourceData
     * @param signData
     * @return
     * @throws IOException
     */
    public static boolean verifySign(byte[] userId, byte[] publicKey, byte[] sourceData, byte[] signData) throws IOException {
        if (publicKey != null && publicKey.length != 0) {
            if (sourceData != null && sourceData.length != 0) {
                SM2 sm2 = SM2.Instance();
                org.bouncycastle.math.ec.ECPoint userKey = sm2.ecc_curve.decodePoint(publicKey);
                SM3Digest sm3 = new SM3Digest();
                byte[] z = sm2.sm2GetZ(userId, userKey);
                sm3.update(z, 0, z.length);
                sm3.update(sourceData, 0, sourceData.length);
                byte[] md = new byte[32];
                sm3.doFinal(md, 0);
                ByteArrayInputStream bis = new ByteArrayInputStream(signData);
                ASN1InputStream dis = new ASN1InputStream(bis);
                ASN1Primitive derObj = dis.readObject();
                Enumeration<ASN1Integer> e = ((ASN1Sequence)derObj).getObjects();
                BigInteger r = ((ASN1Integer)e.nextElement()).getValue();
                BigInteger s = ((ASN1Integer)e.nextElement()).getValue();
                SM2Result sm2Result = new SM2Result();
                sm2Result.r = r;
                sm2Result.s = s;
                sm2.sm2Verify(md, userKey, sm2Result.r, sm2Result.s, sm2Result);
                return sm2Result.r.equals(sm2Result.R);
            } else {
                return false;
            }
        } else {
            return false;
        }
    }

    public class MyKeyPair {
        String publicKey;
        String privateKey;

        public String getPublicKey() {
            return publicKey;
        }

        public void setPublicKey(String publicKey) {
            this.publicKey = publicKey;
        }

        public String getPrivateKey() {
            return privateKey;
        }

        public void setPrivateKey(String privateKey) {
            this.privateKey = privateKey;
        }
    }

    public static void main(String[] args) throws Exception {
        String plainText = "你好啊，朋友";
        byte[] sourceData = plainText.getBytes();

        System.out.println("原数据: "   plainText);

        //1.生成密钥对
        SM2Utils.MyKeyPair myKeyPair = new SM2Utils().generateKeyPair();
        String privateKey = myKeyPair.getPrivateKey();
        String publicKey = myKeyPair.getPublicKey();
        //测试用户
        String userId = "9001@qq.COM";
        //签名
        byte[] c = sign(userId.getBytes(), Util.hexToByte(privateKey), sourceData);
        System.out.println("SM2签名后值===="   Util.getHexString(c));
        //验签
        boolean vs = verifySign(userId.getBytes(), Util.hexToByte(publicKey), sourceData, c);
        System.out.println("验签结果: "   vs);
        //加密
        byte[] cipherText = encrypt(Util.hexToByte(publicKey), sourceData);
        System.out.println("SM2加密后结果==="   new String(Base64.encode(cipherText)));
        //解密
        plainText = new String(decrypt(Util.hexToByte(privateKey), cipherText));
        System.out.println("解密后获取的结果==="   plainText);


    }
}