SM2国密算法java应用，可以与c++端互相验签通过_java sm3withsm2

引入maven依赖

		<dependency>
			<groupId>org.bouncycastle</groupId>
			<artifactId>bcprov-jdk15on</artifactId>
			<version>1.60</version>
		</dependency>

		<dependency>
			<groupId>org.bouncycastle</groupId>
			<artifactId>bcpkix-jdk15on</artifactId>
			<version>1.60</version>
		</dependency>

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import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.gm.GMNamedCurves;
import org.bouncycastle.asn1.x9.X9ECParameters;
import org.bouncycastle.crypto.InvalidCipherTextException;
import org.bouncycastle.crypto.digests.SM3Digest;
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.jcajce.spec.SM2ParameterSpec;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.jce.spec.ECParameterSpec;
import org.bouncycastle.jce.spec.ECPrivateKeySpec;
import org.bouncycastle.jce.spec.ECPublicKeySpec;
import org.bouncycastle.math.ec.ECCurve;
import org.bouncycastle.math.ec.ECPoint;
import org.bouncycastle.util.encoders.Hex;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.io.*;
import java.math.BigInteger;
import java.security.*;
import java.security.cert.CertPathBuilderException;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.util.Arrays;

/**
 * need jars: bcpkix-jdk15on-160.jar bcprov-jdk15on-160.jar
 *
 * ref: https://tools.ietf.org/html/draft-shen-sm2-ecdsa-02
 * http://gmssl.org/docs/oid.html http://www.jonllen.com/jonllen/work/164.aspx
 *
 * 用BC的注意点：
 * 这个版本的BC对SM3withSM2的结果为asn1格式的r和s，如果需要直接拼接的r||s需要自己转换。下面rsAsn1ToPlainByteArray、rsPlainByteArrayToAsn1就在干这事。
 * 这个版本的BC对SM2的结果为C1||C2||C3，据说为旧标准，新标准为C1||C3||C2，用新标准的需要自己转换。下面changeC1C2C3ToC1C3C2、changeC1C3C2ToC1C2C3就在干这事。
 */
public class GmUtil {

	private static BigInteger p = new BigInteger(
			"FFFFFFFE" + "FFFFFFFF" + "FFFFFFFF" + "FFFFFFFF" + "FFFFFFFF" + "00000000" + "FFFFFFFF" + "FFFFFFFF", 16);
	private static BigInteger a = new BigInteger(
			"FFFFFFFE" + "FFFFFFFF" + "FFFFFFFF" + "FFFFFFFF" + "FFFFFFFF" + "00000000" + "FFFFFFFF" + "FFFFFFFC", 16);
	private static BigInteger b = new BigInteger(
			"28E9FA9E" + "9D9F5E34" + "4D5A9E4B" + "CF6509A7" + "F39789F5" + "15AB8F92" + "DDBCBD41" + "4D940E93", 16);
	private static X9ECParameters x9ECParameters = GMNamedCurves.getByName("sm2p256v1");
	private static ECDomainParameters ecDomainParameters = new ECDomainParameters(x9ECParameters.getCurve(),
			x9ECParameters.getG(), x9ECParameters.getN());
	private static ECParameterSpec ecParameterSpec = new ECParameterSpec(x9ECParameters.getCurve(),
			x9ECParameters.getG(), x9ECParameters.getN());
	@SuppressWarnings("deprecation")
	private static ECCurve.Fp curve = new ECCurve.Fp(p, a, b);
	static {
		if (Security.getProvider("BC") == null) {
			Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
		}
	}

	/**
	 *
	 * @param msg
	 * @param userId
	 * @param privateKey
	 * @return r||s，直接拼接byte数组的rs
	 */
	public static byte[] signSm3WithSm2(byte[] msg, byte[] userId, PrivateKey privateKey) {
		return rsAsn1ToPlainByteArray(signSm3WithSm2Asn1Rs(msg, userId, privateKey));
	}

	/**
	 *
	 * @param msg
	 * @param userId
	 * @param privateKey
	 * @return rs in <b>asn1 format</b>
	 */
	public static byte[] signSm3WithSm2Asn1Rs(byte[] msg, byte[] userId, PrivateKey privateKey) {
		try {
			SM2ParameterSpec parameterSpec = new SM2ParameterSpec(userId);
			Signature signer = Signature.getInstance("SM3withSM2", "BC");
			signer.setParameter(parameterSpec);
			signer.initSign(privateKey, new SecureRandom());
			signer.update(msg, 0, msg.length);
			byte[] sig = signer.sign();
			return sig;
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}

	/**
	 *
	 * @param msg
	 * @param userId
	 * @param rs        r||s，直接拼接byte数组的rs
	 * @param publicKey
	 * @return
	 */
	public static boolean verifySm3WithSm2(byte[] msg, byte[] userId, byte[] rs, String publicKey) {
		ECPoint ecPoint = curve.decodePoint(Hex.decode(publicKey));
		ecPoint = ecPoint.normalize();
		BCECPublicKey bcecPublicKey = getPublickeyFromXY(ecPoint.getXCoord().toBigInteger(),ecPoint.getYCoord().toBigInteger());
		return verifySm3WithSm2Asn1Rs(msg, userId, rsPlainByteArrayToAsn1(rs), bcecPublicKey);
	}

	/**
	 *
	 * @param msg
	 * @param userId
	 * @param rs        in <b>asn1 format</b>
	 * @param publicKey
	 * @return
	 */
	public static boolean verifySm3WithSm2Asn1Rs(byte[] msg, byte[] userId, byte[] rs, PublicKey publicKey) {
		try {
			SM2ParameterSpec parameterSpec = new SM2ParameterSpec(userId);
			Signature verifier = Signature.getInstance("SM3withSM2", "BC");
			verifier.setParameter(parameterSpec);
			verifier.initVerify(publicKey);
			verifier.update(msg, 0, msg.length);
			return verifier.verify(rs);
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}

	/**
	 * bc加解密使用旧标c1||c2||c3，此方法在加密后调用，将结果转化为c1||c3||c2
	 * 
	 * @param c1c2c3
	 * @return
	 */
	private static byte[] changeC1C2C3ToC1C3C2(byte[] c1c2c3) {
		final int c1Len = (x9ECParameters.getCurve().getFieldSize() + 7) / 8 * 2 + 1; // sm2p256v1的这个固定65。可看GMNamedCurves、ECCurve代码。
		final int c3Len = 32; // new SM3Digest().getDigestSize();
		byte[] result = new byte[c1c2c3.length];
		System.arraycopy(c1c2c3, 0, result, 0, c1Len); // c1
		System.arraycopy(c1c2c3, c1c2c3.length - c3Len, result, c1Len, c3Len); // c3
		System.arraycopy(c1c2c3, c1Len, result, c1Len + c3Len, c1c2c3.length - c1Len - c3Len); // c2
		return result;
	}

	/**
	 * bc加解密使用旧标c1||c3||c2，此方法在解密前调用，将密文转化为c1||c2||c3再去解密
	 * 
	 * @param c1c3c2
	 * @return
	 */
	private static byte[] changeC1C3C2ToC1C2C3(byte[] c1c3c2) {
		final int c1Len = (x9ECParameters.getCurve().getFieldSize() + 7) / 8 * 2 + 1; // sm2p256v1的这个固定65。可看GMNamedCurves、ECCurve代码。
		final int c3Len = 32; // new SM3Digest().getDigestSize();
		byte[] result = new byte[c1c3c2.length];
		System.arraycopy(c1c3c2, 0, result, 0, c1Len); // c1: 0->65
		System.arraycopy(c1c3c2, c1Len + c3Len, result, c1Len, c1c3c2.length - c1Len - c3Len); // c2
		System.arraycopy(c1c3c2, c1Len, result, c1c3c2.length - c3Len, c3Len); // c3
		return result;
	}

	/**
	 * c1||c3||c2
	 * 
	 * @param data
	 * @param key
	 * @return
	 */
	public static byte[] sm2Decrypt(byte[] data, PrivateKey key) {
		return sm2DecryptOld(changeC1C3C2ToC1C2C3(data), key);
	}

	/**
	 * c1||c3||c2
	 * 
	 * @param data
	 * @param key
	 * @return
	 */

	public static byte[] sm2Encrypt(byte[] data, PublicKey key) {
		return changeC1C2C3ToC1C3C2(sm2EncryptOld(data, key));
	}

	/**
	 * c1||c2||c3
	 * 
	 * @param data
	 * @param key
	 * @return
	 */
	public static byte[] sm2EncryptOld(byte[] data, PublicKey key) {
		BCECPublicKey localECPublicKey = (BCECPublicKey) key;
		ECPublicKeyParameters ecPublicKeyParameters = new ECPublicKeyParameters(localECPublicKey.getQ(),
				ecDomainParameters);
		SM2Engine sm2Engine = new SM2Engine();
		sm2Engine.init(true, new ParametersWithRandom(ecPublicKeyParameters, new SecureRandom()));
		try {
			return sm2Engine.processBlock(data, 0, data.length);
		} catch (InvalidCipherTextException e) {
			throw new RuntimeException(e);
		}
	}

	/**
	 * c1||c2||c3
	 * 
	 * @param data
	 * @param key
	 * @return
	 */
	public static byte[] sm2DecryptOld(byte[] data, PrivateKey key) {
		BCECPrivateKey localECPrivateKey = (BCECPrivateKey) key;
		ECPrivateKeyParameters ecPrivateKeyParameters = new ECPrivateKeyParameters(localECPrivateKey.getD(),
				ecDomainParameters);
		SM2Engine sm2Engine = new SM2Engine();
		sm2Engine.init(false, ecPrivateKeyParameters);
		try {
			return sm2Engine.processBlock(data, 0, data.length);
		} catch (InvalidCipherTextException e) {
			throw new RuntimeException(e);
		}
	}

	public static byte[] sm4Encrypt(byte[] keyBytes, byte[] plain) {
		if (keyBytes.length != 16)
			throw new RuntimeException("err key length");
		if (plain.length % 16 != 0)
			throw new RuntimeException("err data length");

		try {
			Key key = new SecretKeySpec(keyBytes, "SM4");
			Cipher out = Cipher.getInstance("SM4/ECB/NoPadding", "BC");
			out.init(Cipher.ENCRYPT_MODE, key);
			return out.doFinal(plain);
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}

	public static byte[] sm4Decrypt(byte[] keyBytes, byte[] cipher) {
		if (keyBytes.length != 16)
			throw new RuntimeException("err key length");
		if (cipher.length % 16 != 0)
			throw new RuntimeException("err data length");

		try {
			Key key = new SecretKeySpec(keyBytes, "SM4");
			Cipher in = Cipher.getInstance("SM4/ECB/NoPadding", "BC");
			in.init(Cipher.DECRYPT_MODE, key);
			return in.doFinal(cipher);

		} catch (Exception e) {
			throw new RuntimeException(e);
		}

	}

	/**
	 * @param bytes
	 * @return
	 */
	public static byte[] sm3(byte[] bytes) {
		SM3Digest sm3 = new SM3Digest();
		sm3.update(bytes, 0, bytes.length);
		byte[] result = new byte[sm3.getDigestSize()];
		sm3.doFinal(result, 0);
		return result;
	}

	private final static int RS_LEN = 32;

	private static byte[] bigIntToFixexLengthBytes(BigInteger rOrS) {
		// for sm2p256v1, n is
		// 00fffffffeffffffffffffffffffffffff7203df6b21c6052b53bbf40939d54123,
		// r and s are the result of mod n, so they should be less than n and have
		// length<=32
		byte[] rs = rOrS.toByteArray();
		if (rs.length == RS_LEN)
			return rs;
		else if (rs.length == RS_LEN + 1 && rs[0] == 0)
			return Arrays.copyOfRange(rs, 1, RS_LEN + 1);
		else if (rs.length < RS_LEN) {
			byte[] result = new byte[RS_LEN];
			Arrays.fill(result, (byte) 0);
			System.arraycopy(rs, 0, result, RS_LEN - rs.length, rs.length);
			return result;
		} else {
			throw new RuntimeException("err rs: " + Hex.toHexString(rs));
		}
	}

	/**
	 * BC的SM3withSM2签名得到的结果的rs是asn1格式的，这个方法转化成直接拼接r||s
	 * 
	 * @param rsDer rs in asn1 format
	 * @return sign result in plain byte array
	 */
	private static byte[] rsAsn1ToPlainByteArray(byte[] rsDer) {
		ASN1Sequence seq = ASN1Sequence.getInstance(rsDer);
		byte[] r = bigIntToFixexLengthBytes(ASN1Integer.getInstance(seq.getObjectAt(0)).getValue());
		byte[] s = bigIntToFixexLengthBytes(ASN1Integer.getInstance(seq.getObjectAt(1)).getValue());
		byte[] result = new byte[RS_LEN * 2];
		System.arraycopy(r, 0, result, 0, r.length);
		System.arraycopy(s, 0, result, RS_LEN, s.length);
		return result;
	}

	/**
	 * BC的SM3withSM2验签需要的rs是asn1格式的，这个方法将直接拼接r||s的字节数组转化成asn1格式
	 * 
	 * @param sign in plain byte array
	 * @return rs result in asn1 format
	 */
	private static byte[] rsPlainByteArrayToAsn1(byte[] sign) {
		if (sign.length != RS_LEN * 2)
			throw new RuntimeException("err rs. ");
		BigInteger r = new BigInteger(1, Arrays.copyOfRange(sign, 0, RS_LEN));
		BigInteger s = new BigInteger(1, Arrays.copyOfRange(sign, RS_LEN, RS_LEN * 2));
		ASN1EncodableVector v = new ASN1EncodableVector();
		v.add(new ASN1Integer(r));
		v.add(new ASN1Integer(s));
		try {
			return new DERSequence(v).getEncoded("DER");
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}

	public static KeyPair generateKeyPair() {
		try {
			KeyPairGenerator kpGen = KeyPairGenerator.getInstance("EC", "BC");
			kpGen.initialize(ecParameterSpec, new SecureRandom());
			KeyPair kp = kpGen.generateKeyPair();
			return kp;
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}

	public static BCECPrivateKey getPrivatekeyFromD(BigInteger d) {
		ECPrivateKeySpec ecPrivateKeySpec = new ECPrivateKeySpec(d, ecParameterSpec);
		return new BCECPrivateKey("EC", ecPrivateKeySpec, BouncyCastleProvider.CONFIGURATION);
	}

	public static BCECPublicKey getPublickeyFromXY(BigInteger x, BigInteger y) {
		ECPublicKeySpec ecPublicKeySpec = new ECPublicKeySpec(x9ECParameters.getCurve().createPoint(x, y),
				ecParameterSpec);
		return new BCECPublicKey("EC", ecPublicKeySpec, BouncyCastleProvider.CONFIGURATION);
	}

	public static PublicKey getPublickeyFromX509File(File file) {
		try {
			CertificateFactory cf = CertificateFactory.getInstance("X.509", "BC");
			FileInputStream in = new FileInputStream(file);
			X509Certificate x509 = (X509Certificate) cf.generateCertificate(in);
//           System.out.println(x509.getSerialNumber());
			return x509.getPublicKey();
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}

	public static void main(String[] args)
			throws IOException, NoSuchAlgorithmException, NoSuchProviderException, InvalidAlgorithmParameterException,
			CertPathBuilderException, InvalidKeyException, SignatureException, CertificateException {

		// 生成公私钥对 ---------------------
//		KeyPair kp = generateKeyPair();
//
//       System.out.println(Hex.toHexString(kp.getPrivate().getEncoded()));
//       System.out.println(Hex.toHexString(kp.getPublic().getEncoded()));

//       System.out.println(kp.getPrivate().getAlgorithm());
//       System.out.println(kp.getPublic().getAlgorithm());

//       System.out.println(kp.getPrivate().getFormat());
//       System.out.println(kp.getPublic().getFormat());

//		System.out.println("private key d: " + ((BCECPrivateKey) kp.getPrivate()).getD().toString(16));
//		System.out.println("private key d: " + Hex.toHexString(((BCECPrivateKey) kp.getPrivate()).getD().toByteArray()));
//		System.out.println("public key q:" + Hex.toHexString(((BCECPublicKey) kp.getPublic()).getQ().getEncoded(true))); // {x,
																															// y,
																															// zs...}

//		byte[] msg = "1234567890".getBytes();
//		byte[] userId = "1234567890".getBytes();
//		String pri = ((BCECPrivateKey) kp.getPrivate()).getD().toString(16);
//		String pri = "a69587527f10addc2daf640c792157dddcc521b761ce47df96aa4bbe8a58bff1";
//		BigInteger d = new BigInteger(pri, 16);
//		BCECPrivateKey bcecPrivateKey = getPrivatekeyFromD(d);
//		byte[] sig = signSm3WithSm2(msg, userId, bcecPrivateKey);
//		System.out.println(Hex.toHexString(sig));
		
//		String pub = Hex.toHexString(((BCECPublicKey) kp.getPublic()).getQ().getEncoded(true));
//		String pub = "02bc72dddb2358dcf5f3066dc2fa8babcc6af07eaad9f76683809b7e73ee85aabf";
//		ECPoint ecPoint = curve.decodePoint(Hex.decode(pub));
//		ecPoint = ecPoint.normalize();
//		BCECPublicKey bcecPublicKey = getPublickeyFromXY(ecPoint.getXCoord().toBigInteger(),ecPoint.getYCoord().toBigInteger());
//		System.out.println(verifySm3WithSm2(msg, userId, sig, bcecPublicKey));
		
//       // 由d生成私钥 ---------------------
//       BigInteger d = new BigInteger("097b5230ef27c7df0fa768289d13ad4e8a96266f0fcb8de40d5942af4293a54a", 16);
//       BCECPrivateKey bcecPrivateKey = getPrivatekeyFromD(d);
//       System.out.println(bcecPrivateKey.getParameters());
//       System.out.println(Hex.toHexString(bcecPrivateKey.getEncoded()));
//       System.out.println(bcecPrivateKey.getAlgorithm());
//       System.out.println(bcecPrivateKey.getFormat());
//       System.out.println(bcecPrivateKey.getD());
//       System.out.println(bcecPrivateKey instanceof java.security.interfaces.ECPrivateKey);
//       System.out.println(bcecPrivateKey instanceof ECPrivateKey);
//       System.out.println(bcecPrivateKey.getParameters());

//       公钥X坐标PublicKeyXHex: 59cf9940ea0809a97b1cbffbb3e9d96d0fe842c1335418280bfc51dd4e08a5d4
//       公钥Y坐标PublicKeyYHex: 9a7f77c578644050e09a9adc4245d1e6eba97554bc8ffd4fe15a78f37f891ff8
//       PublicKey publicKey = getPublickeyFromX509File(new File("/Users/xxx/Downloads/xxxxx.cer"));
//       System.out.println(publicKey);
//       PublicKey publicKey1 = getPublickeyFromXY(new BigInteger("59cf9940ea0809a97b1cbffbb3e9d96d0fe842c1335418280bfc51dd4e08a5d4", 16), new BigInteger("9a7f77c578644050e09a9adc4245d1e6eba97554bc8ffd4fe15a78f37f891ff8", 16));
//       System.out.println(publicKey1);
//       System.out.println(publicKey.equals(publicKey1));
//       System.out.println(publicKey.getEncoded().equals(publicKey1.getEncoded()));
//

//       // sm2 encrypt and decrypt test ---------------------
//       KeyPair kp = generateKeyPair();
//       PublicKey publicKey2 = kp.getPublic();
//       PrivateKey privateKey2 = kp.getPrivate();
//       byte[]bs = sm2Encrypt("s".getBytes(), publicKey2);
//       System.out.println(Hex.toHexString(bs));
//       bs = sm2Decrypt(bs, privateKey2);
//       System.out.println(new String(bs));

//       // sm4 encrypt and decrypt test ---------------------
//       //0123456789abcdeffedcba9876543210 + 0123456789abcdeffedcba9876543210 -> 681edf34d206965e86b3e94f536e4246
//       byte[] plain = Hex.decode("0123456789abcdeffedcba98765432100123456789abcdeffedcba98765432100123456789abcdeffedcba9876543210");
//       byte[] key = Hex.decode("0123456789abcdeffedcba9876543210");
//       byte[] cipher = Hex.decode("595298c7c6fd271f0402f804c33d3f66");
//       byte[] bs = sm4Encrypt(key, plain);
//       System.out.println(Hex.toHexString(bs));;
//       bs = sm4Decrypt(key, bs);
//       System.out.println(Hex.toHexString(bs));
	}
}
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public class S2KeyPair {

	private final String publicKey;
	private final String privateKey;

	public S2KeyPair(String publicKey, String privateKey) {
		this.publicKey = publicKey;
		this.privateKey = privateKey;
	}

	public String getPublicKey() {
		return publicKey;
	}

	public String getPrivateKey() {
		return privateKey;
	}
}
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import java.math.BigInteger;
import java.security.KeyPair;

import org.bouncycastle.jcajce.provider.asymmetric.ec.BCECPrivateKey;
import org.bouncycastle.jcajce.provider.asymmetric.ec.BCECPublicKey;
import org.bouncycastle.util.encoders.Hex;

public class SM2Utils {
	
	private static String userId = "123456";

	//获取密钥对
	public static S2KeyPair createKey() {
		KeyPair keyPair = GmUtil.generateKeyPair();
		String privateKey = ((BCECPrivateKey) keyPair.getPrivate()).getD().toString(16);
		System.out.println("私钥"+privateKey);
		String publicKey = Hex.toHexString(((BCECPublicKey) keyPair.getPublic()).getQ().getEncoded(true));
		System.out.println("公钥" + publicKey);
		return new S2KeyPair(publicKey, privateKey);
	}
	//签名
	public static String signSm3WithSm2(String msg, String privateKey) {
		BigInteger d = new BigInteger(privateKey, 16);
		BCECPrivateKey bcecPrivateKey = GmUtil.getPrivatekeyFromD(d);
		byte[] sig = GmUtil.signSm3WithSm2(msg.getBytes(), userId.getBytes(), bcecPrivateKey);
		String hexString = Hex.toHexString(sig);
		System.out.println("签名值"+hexString);
		return hexString;
	}
	//验签
	public static boolean verifySm3WithSm2(String msg, String sig, String publicKey) {
		boolean verify = GmUtil.verifySm3WithSm2(msg.getBytes(), userId.getBytes(), sig.getBytes(), publicKey);
		System.out.println("验签结果"+verify);
		return verify;
	}

}

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