SM2签名验签 java

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mob64ca12e4972a 2024-05-17 07:25:18 ©著作权

文章标签 java ide Java 文章分类 Java 后端开发

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SM2签名验签 java

什么是SM2签名验签？

SM2是一种国密标准，是中国自主设计的椭圆曲线密码算法。SM2算法不仅适用于签名验签，还可以用于加密解密等。在信息安全领域，签名验签是非常重要的一环，通过签名可以验证数据的完整性和真实性。

SM2签名验签算法基于椭圆曲线密码学，具有较高的安全性和效率。在Java中，我们可以使用BouncyCastle等库来实现SM2的签名验签功能。

如何在Java中实现SM2签名验签？

签名

下面是一个简单的Java代码示例，演示如何使用BouncyCastle库实现SM2签名功能：

import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.crypto.params.ParametersWithID;
import org.bouncycastle.jce.ECNamedCurveTable;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.jce.spec.ECNamedCurveParameterSpec;
import org.bouncycastle.jce.spec.ECParameterSpec;
import org.bouncycastle.jce.spec.ECPublicKeySpec;
import org.bouncycastle.jce.spec.ECPrivateKeySpec;
import org.bouncycastle.math.ec.ECPoint;
import org.bouncycastle.util.encoders.Hex;

import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.SecureRandom;
import java.security.Security;
import java.security.Signature;

public class SM2Util {

    public static byte[] sign(byte[] data, byte[] priKey) throws Exception {
        Security.addProvider(new BouncyCastleProvider());

        ECNamedCurveParameterSpec sm2Spec = ECNamedCurveTable.getParameterSpec("sm2p256v1");
        ECParameterSpec ecParameterSpec = sm2Spec;

        ECPrivateKeySpec privateKeySpec = new ECPrivateKeySpec(sm2Spec.getN(), new ECPrivateKeyParameters(priKey, ecParameterSpec));

        Signature signature = Signature.getInstance("SM3withSM2", "BC");
        signature.initSign(privateKeySpec);

        signature.update(data);
        return signature.sign();
    }
}

验签

下面是一个简单的Java代码示例，演示如何使用BouncyCastle库实现SM2验签功能：

import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.crypto.params.ParametersWithID;
import org.bouncycastle.jce.ECNamedCurveTable;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.jce.spec.ECNamedCurveParameterSpec;
import org.bouncycastle.jce.spec.ECParameterSpec;
import org.bouncycastle.jce.spec.ECPoint;
import org.bouncycastle.jce.spec.ECPublicKeySpec;
import org.bouncycastle.jce.spec.ECPrivateKeySpec;
import org.bouncycastle.math.ec.ECPoint;
import org.bouncycastle.util.encoders.Hex;

import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.SecureRandom;
import java.security.Security;
import java.security.Signature;

public class SM2Util {

    public static boolean verify(byte[] data, byte[] sign, byte[] pubKey) throws Exception {
        Security.addProvider(new BouncyCastleProvider());

        ECNamedCurveParameterSpec sm2Spec = ECNamedCurveTable.getParameterSpec("sm2p256v1");
        ECParameterSpec ecParameterSpec = sm2Spec;

        ECPoint q = sm2Spec.getCurve().createPoint(pubKey[0], pubKey[1]);

        ECPublicKeySpec keySpec = new ECPublicKeySpec(q, ecParameterSpec);

        Signature signature = Signature.getInstance("SM3withSM2", "BC");
        signature.initVerify(keySpec);

        signature.update(data);
        return signature.verify(sign);
    }
}