如何使用私钥对字符串进行签名 [英] How to sign string with private key

问题描述

如果我已将私钥设为 byte [] SHA1withRSA 获取字符串的签名？ >或字符串？

How can I get the signature of a string using SHA1withRSA if I already have the Private Key as byte[] or String?

推荐答案

我想你说的是你知道的密钥对然后想要签名/验证。

I guess what you say is you know the key pair before hand and want to sign/verify with that.

请参阅以下代码。

import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.Signature;

import sun.misc.BASE64Encoder;

public class MainClass {
    public static void main(String[] args) throws Exception {

        KeyPair keyPair = getKeyPair();

        byte[] data = "test".getBytes("UTF8");

        Signature sig = Signature.getInstance("SHA1WithRSA");
        sig.initSign(keyPair.getPrivate());
        sig.update(data);
        byte[] signatureBytes = sig.sign();
        System.out.println("Signature:" + new BASE64Encoder().encode(signatureBytes));

        sig.initVerify(keyPair.getPublic());
        sig.update(data);

        System.out.println(sig.verify(signatureBytes));
    }

    private static KeyPair getKeyPair() throws NoSuchAlgorithmException {
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
        kpg.initialize(1024);
        return kpg.genKeyPair();
    }
}

在这里你需要将方法getKeyPair（）更改为提供您已知的密钥对。您可以从Java密钥库[JKS]加载它。

Here you need to change the method getKeyPair() to supply your known key pair. You may load it from a java key store [JKS].

您不能将任意字节数组作为公钥或私钥。它们应该是相关的。

You can't just have an arbitrary byte array either as your public key or private key. They should be generated in relation.

这篇关于如何使用私钥对字符串进行签名的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！