Java 通过secp256k1签名获取公钥
时间: 2023-12-22 08:05:10 浏览: 32
要通过secp256k1签名获取公钥,您可以使用Java的Bouncy Castle库来实现。以下是一个示例代码片段,可以帮助您开始:
```java
import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
import org.bouncycastle.crypto.generators.ECKeyPairGenerator;
import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.crypto.signers.ECDSASigner;
import org.bouncycastle.crypto.signers.HMacDSAKCalculator;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.math.ec.ECPoint;
import java.math.BigInteger;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.Security;
import java.security.SignatureException;
public class ECDSASignerExample {
public static void main(String[] args) throws Exception {
Security.addProvider(new BouncyCastleProvider());
KeyPairGenerator keyGen = KeyPairGenerator.getInstance("ECDSA", "BC");
keyGen.initialize(256);
KeyPair keyPair = keyGen.generateKeyPair();
ECPrivateKeyParameters privateKey = new ECPrivateKeyParameters(((java.security.interfaces.ECPrivateKey)keyPair.getPrivate()).getS(), ECUtil.getNamedCurveByName("secp256k1"));
ECPublicKeyParameters publicKey = new ECPublicKeyParameters(((java.security.interfaces.ECPublicKey)keyPair.getPublic()).getQ(), ECUtil.getNamedCurveByName("secp256k1"));
String message = "Hello, world!";
byte[] messageHash = sha256(message.getBytes("UTF-8"));
ECDSASigner signer = new ECDSASigner(new HMacDSAKCalculator(new SHA256Digest()));
signer.init(true, privateKey);
BigInteger[] signature = signer.generateSignature(messageHash);
ECPoint q = ECUtil.getCurve("secp256k1").decodePoint(publicKey.getQ().getEncoded(false));
boolean verified = signer.verifySignature(messageHash, signature[0], signature[1], q);
System.out.println("Verified: " + verified);
}
private static byte[] sha256(byte[] input) throws NoSuchAlgorithmException {
MessageDigest digest = MessageDigest.getInstance("SHA-256");
return digest.digest(input);
}
}
```
这个示例代码片段生成一个新的密钥对,使用SHA-256哈希算法对消息进行哈希,在哈希消息上对其进行 ECDSA 签名,并验证签名。您可以根据需要修改代码来适应您的实际用例。