package com.zpc.cryptography;import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.math.BigInteger;
import java.util.Enumeration;import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERInteger;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DEROutputStream;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.math.ec.ECPoint;
import org.bouncycastle.util.encoders.Base64;public class SM2Utils {public static byte[] encrypt(byte[] publicKey, byte[] data) throws IOException {if (publicKey == null || publicKey.length == 0) {return null;}if (data == null || data.length == 0) {return null;}byte[] source = new byte[data.length];System.arraycopy(data, 0, source, 0, data.length);Cipher cipher = new Cipher();SM2 sm2 = SM2.Instance();ECPoint userKey = sm2.ecc_curve.decodePoint(publicKey);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();
}public static byte[] decrypt(byte[] privateKey, byte[] encryptedData) throws IOException {if (privateKey == null || privateKey.length == 0) {return null;}if (encryptedData == null || encryptedData.length == 0) {return null;}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();//DERObject derObj = dis.readObject();ASN1Sequence asn1 = (ASN1Sequence) derObj;//DERInteger x = (DERInteger) asn1.getObjectAt(0);//DERInteger y = (DERInteger) asn1.getObjectAt(1);ASN1Integer x = (ASN1Integer) asn1.getObjectAt(0);ASN1Integer y = (ASN1Integer) asn1.getObjectAt(1);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;
}/*** 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) {return null;}if (sourceData == null || sourceData.length == 0) {return null;}SM2 sm2 = SM2.Instance();BigInteger userD = new BigInteger(privateKey);//System.out.println("userD: " + userD.toString(16));//System.out.println("");ECPoint userKey = sm2.ecc_point_g.multiply(userD);//System.out.println("椭圆曲线点X: " + userKey.getX().toBigInteger().toString(16));//System.out.println("椭圆曲线点Y: " + userKey.getY().toBigInteger().toString(16));//System.out.println("");byte[] z = sm2.sm2GetZ(userId, userKey);//System.out.println("SM3摘要Z: " + Util.getHexString(z));//System.out.println("");//System.out.println("M: " + Util.getHexString(sourceData));//System.out.println("");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);//System.out.println("SM3摘要值: " + Util.getHexString(md));//System.out.println("");SM2Result sm2Result = new SM2Result();sm2.sm2Sign(md, userD, userKey, sm2Result);//System.out.println("r: " + sm2Result.r.toString(16));//System.out.println("s: " + sm2Result.s.toString(16));//System.out.println("");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);//DERObject sign = new DERSequence(v2);//byte[] signdata = sign.getDEREncoded();byte[] signdata = sign.getEncoded();return signdata;
}@SuppressWarnings("unchecked")
public static boolean verifySign(byte[] userId, byte[] publicKey, byte[] sourceData, byte[] signData) throws IOException {if (publicKey == null || publicKey.length == 0) {return false;}if (sourceData == null || sourceData.length == 0) {return false;}SM2 sm2 = SM2.Instance();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);//System.out.println("SM3摘要值: " + Util.getHexString(md));//System.out.println("");ByteArrayInputStream bis = new ByteArrayInputStream(signData);ASN1InputStream dis = new ASN1InputStream(bis);//DERObject derObj = dis.readObject();ASN1Primitive derObj = dis.readObject();Enumeration<ASN1Integer> e = ((ASN1Sequence) derObj).getObjects();BigInteger r = e.nextElement().getValue();BigInteger s = e.nextElement().getValue();SM2Result sm2Result = new SM2Result();sm2Result.r = r;sm2Result.s = s;//System.out.println("r: " + sm2Result.r.toString(16));//System.out.println("s: " + sm2Result.s.toString(16));//System.out.println("");sm2.sm2Verify(md, userKey, sm2Result.r, sm2Result.s, sm2Result);return sm2Result.r.equals(sm2Result.R);
}public static void main(String[] args) throws Exception {String plainText = "message digest";//1.源数据数组byte[] sourceData = plainText.getBytes();// 国密规范测试私钥String prik = "128B2FA8BD433C6C068C8D803DFF79792A519A55171B1B650C23661D15897263";//2.私钥先转十六进制，然后进行Base64编码String prikS = new String(Base64.encode(Util.hexToByte(prik)));System.out.println("转换后的私钥：prikS====" + prikS);//System.out.println("");// 国密规范测试用户IDString userId = "ALICE123@YAHOO.COM";//获取userId十六进制字符串System.out.println("十六进制userId: " + Util.getHexString(userId.getBytes()));//System.out.println("");//System.out.println("签名: ");//3.用userId和私钥，对明文数据签名(userid、prik、sourceData)byte[] c = SM2Utils.sign(userId.getBytes(), Base64.decode(prikS.getBytes()), sourceData);System.out.println("SM2签名后值====" + Util.getHexString(c));//System.out.println("");// 国密规范测试公钥String pubk = "040AE4C7798AA0F119471BEE11825BE46202BB79E2A5844495E97C04FF4DF2548A7C0240F88F1CD4E16352A73C17B7F16F07353E53A176D684A9FE0C6BB798E857";String pubkS = new String(Base64.encode(Util.hexToByte(pubk)));System.out.println("转换后的公钥pubkS====" + pubkS);//System.out.println("");//System.out.println("验签: ");//4.用公钥进行验签(userId、pubk、sourceData、签名数据c)boolean vs = SM2Utils.verifySign(userId.getBytes(), Base64.decode(pubkS.getBytes()), sourceData, c);System.out.println("验签结果: " + vs);//System.out.println("");//System.out.println("加密: ");//5.SM2加密算法byte[] cipherText = SM2Utils.encrypt(Base64.decode(pubkS.getBytes()), sourceData);System.out.println("SM2加密后结果===" + new String(Base64.encode(cipherText)));System.out.println("");//System.out.println("解密: ");//6.SM2解密算法plainText = new String(SM2Utils.decrypt(Base64.decode(prikS.getBytes()), cipherText));System.out.println("解密后获取的结果===" + plainText);}
}

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