java写一个SM2验签方法,需要输出签名R和签名S
时间: 2024-05-21 08:11:35 浏览: 20
以下是一个简单的Java代码示例,用于验证SM2签名并输出签名R和签名S:
```java
import org.bouncycastle.asn1.*;
import org.bouncycastle.asn1.x9.*;
import org.bouncycastle.crypto.params.*;
import org.bouncycastle.crypto.signers.SM2Signer;
import org.bouncycastle.math.ec.*;
import org.bouncycastle.util.encoders.Hex;
import java.io.IOException;
import java.math.BigInteger;
import java.security.*;
import java.security.spec.ECGenParameterSpec;
public class SM2Verify {
public static void main(String[] args) throws Exception {
// 读取公钥
String publicKeyString = "3059301306072A8648CE3D020106082A811CCF5501822D03420004A40B9B3CDBA9C66C4E6FBC1F9ADAEF1056CB8116C29C4A8C732F4FAB9FDBF7C04E26B2AA5D8D9E9E0AAA8E0F88C7D8CD8B3E0D8BBD57A6E0E9791FEA28B6";
byte[] publicKeyBytes = Hex.decode(publicKeyString);
ASN1Sequence publicKeySequence = ASN1Sequence.getInstance(publicKeyBytes);
X9ECParameters ecParameters = ECNamedCurveTable.getByOID(X9ObjectIdentifiers.prime256v1);
ECDomainParameters ecDomainParameters = new ECDomainParameters(ecParameters.getCurve(), ecParameters.getG(), ecParameters.getN(), ecParameters.getH());
ECPublicKeyParameters ecPublicKeyParameters = new ECPublicKeyParameters((ASN1OctetString.getInstance(publicKeySequence.getObjectAt(1))).getOctets(), ecDomainParameters);
// 读取签名
String signatureString = "30450220601a12e6a7f3c6d0f115f81efb2a402b9ec6d03dc1d1f6b7b2c4d9b6c8f5a930022100e3f90e5a7c80e35dfc5f4c3b2b4c7176969d5c3fc5f7ed7fb8d1c9c2b1c316c2";
byte[] signatureBytes = Hex.decode(signatureString);
// 读取待验签数据
String dataString = "Hello, world!";
byte[] dataBytes = dataString.getBytes();
// 验签
SM2Signer sm2Signer = new SM2Signer();
sm2Signer.init(false, ecPublicKeyParameters);
ASN1Sequence signatureSequence = ASN1Sequence.getInstance(signatureBytes);
BigInteger r = ASN1Integer.getInstance(signatureSequence.getObjectAt(0)).getValue();
BigInteger s = ASN1Integer.getInstance(signatureSequence.getObjectAt(1)).getValue();
sm2Signer.update(dataBytes, 0, dataBytes.length);
boolean verifyResult = sm2Signer.verifySignature(r, s);
// 输出签名R和签名S
System.out.println("R: " + r.toString(16));
System.out.println("S: " + s.toString(16));
// 输出验签结果
System.out.println("Verify Result: " + verifyResult);
}
}
```
在这个示例中,我们使用了 BouncyCastle 加密库来处理密码学操作。首先,我们从公钥字符串中读取公钥信息,并将其转换为 `ECPublicKeyParameters` 对象。然后,我们从签名字符串中读取签名信息,并将其转换为 `BigInteger` 类型的签名 R 和 S 值。最后,我们使用 `SM2Signer` 类来验证签名,并输出签名 R 和 S 值以及验签结果。
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