java实现SM2加解密
时间: 2023-10-19 08:00:55 浏览: 206
要在Java中实现SM2加解密,您可以使用Bouncy Castle等Java加密库中的SM2实现。以下是一个简单的示例代码,演示如何使用Bouncy Castle实现SM2加解密:
```java
import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
import org.bouncycastle.crypto.digests.SM3Digest;
import org.bouncycastle.crypto.engines.SM2Engine;
import org.bouncycastle.crypto.generators.ECKeyPairGenerator;
import org.bouncycastle.crypto.params.ECDomainParameters;
import org.bouncycastle.crypto.params.ECKeyGenerationParameters;
import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.crypto.util.PrivateKeyFactory;
import org.bouncycastle.crypto.util.PublicKeyFactory;
import org.bouncycastle.util.encoders.Hex;
import java.security.SecureRandom;
public class SM2Example {
public static void main(String[] args) throws Exception {
// 生成密钥对
AsymmetricCipherKeyPair keyPair = generateKeyPair();
// 明文
String plainText = "Hello, SM2!";
System.out.println("明文:" + plainText);
// 加密
byte[] cipherText = encrypt(plainText.getBytes(), keyPair);
System.out.println("密文:" + Hex.toHexString(cipherText));
// 解密
byte[] decryptedText = decrypt(cipherText, keyPair);
System.out.println("解密后的明文:" + new String(decryptedText));
}
private static AsymmetricCipherKeyPair generateKeyPair() {
SecureRandom random = new SecureRandom();
// 定义SM2曲线
ECDomainParameters domainParams = new ECDomainParameters(
SM2Curve.p, SM2Curve.a, SM2Curve.b, SM2Curve.G, SM2Curve.n, SM2Curve.h);
// 生成密钥对
ECKeyPairGenerator keyPairGenerator = new ECKeyPairGenerator();
ECKeyGenerationParameters keyGenerationParams = new ECKeyGenerationParameters(domainParams, random);
keyPairGenerator.init(keyGenerationParams);
return keyPairGenerator.generateKeyPair();
}
private static byte[] encrypt(byte[] plainText, AsymmetricCipherKeyPair keyPair) throws Exception {
ECPublicKeyParameters publicKey = (ECPublicKeyParameters) keyPair.getPublic();
ECPrivateKeyParameters privateKey = (ECPrivateKeyParameters) keyPair.getPrivate();
// 使用SM3作为摘要算法
SM3Digest sm3Digest = new SM3Digest();
byte[] z = new byte[32];
// 计算用户标识
System.arraycopy(sm3Digest.digest("1234567812345678".getBytes()), 0, z, 0, z.length);
// 计算公钥
byte[] publicKeyBytes = publicKey.getQ().getEncoded(false);
System.arraycopy(publicKeyBytes, 1, z, z.length - 64, 64);
// 使用SM2进行加密
SM2Engine sm2Engine = new SM2Engine();
sm2Engine.init(true, new SM2Engine.SM2KeyParameters(true, z, publicKey));
return sm2Engine.processBlock(plainText, 0, plainText.length);
}
private static byte[] decrypt(byte[] cipherText, AsymmetricCipherKeyPair keyPair) throws Exception {
ECPublicKeyParameters publicKey = (ECPublicKeyParameters) keyPair.getPublic();
ECPrivateKeyParameters privateKey = (ECPrivateKeyParameters) keyPair.getPrivate();
// 使用SM3作为摘要算法
SM3Digest sm3Digest = new SM3Digest();
byte[] z = new byte[32];
// 计算用户标识
System.arraycopy(sm3Digest.digest("1234567812345678".getBytes()), 0, z, 0, z.length);
// 计算公钥
byte[] publicKeyBytes = publicKey.getQ().getEncoded(false);
System.arraycopy(publicKeyBytes, 1, z, z.length - 64, 64);
// 使用SM2进行解密
SM2Engine sm2Engine = new SM2Engine();
sm2Engine.init(false, new SM2Engine.SM2KeyParameters(false, z, privateKey));
return sm2Engine.processBlock(cipherText, 0, cipherText.length);
}
}
```
需要注意的是,在该示例代码中,我们使用了Bouncy Castle中的SM2曲线参数和SM3摘要算法。同时,在加解密过程中,需要计算用户标识和公钥,并将其作为SM2算法的输入参数之一。
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