【密码学】RSA公私钥的生成

一、liunx命令生成公私钥文件

ssh-keygen -t rsa -b 4096 -f ~/.ssh/my_rsa_key

-t rsa 指定密钥类型为 RSA。

-b 4096 指定密钥的位数为 4096 位。这是一个较为安全的选择，但可以根据需要调整大小。

-f ~/.ssh/my_rsa_key 指定密钥文件的存储路径和文件名。

执行上述命令后，你会在 ~/.ssh 目录下得到一个名为 my_rsa_key 的私钥文件和一个同名但后缀为 .pub 的公钥文件 my_rsa_key.pub。

 

 

 

参考1：https://blog.csdn.net/qq_23974323/article/details/77678491

参考2：java生成代码

package com.sxf.study.common.dao.rsa;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import java.security.Key;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.util.HashMap;
import java.util.Map;

/**
 * @Author 
 * @Date 2021/9/27 12:05 下午
 **/
public class RsaTest {
    public static final String KEY_ALGORITHM = "RSA";

//    public static final String SIGNATURE_ALGORITHM = "MD5withRSA";
    public static final String SIGNATURE_ALGORITHM = "SHA1WithRSA";

    private static final String PUBLIC_KEY = "RSAPublicKey";

    private static final String PRIVATE_KEY = "RSAPrivateKey";




    public static String getPublicKey(Map keyMap) throws Exception {
        Key key = (Key) keyMap.get(PUBLIC_KEY);

        byte[] publicKey = key.getEncoded();

        return encryptBASE64(key.getEncoded());

    }

    public static String getPrivateKey(Map keyMap) throws Exception {
        Key key = (Key) keyMap.get(PRIVATE_KEY);

        byte[] privateKey = key.getEncoded();

        return encryptBASE64(key.getEncoded());

    }

    public static byte[] decryptBASE64(String key) throws Exception {
        return (new BASE64Decoder()).decodeBuffer(key);

    }

    public static String encryptBASE64(byte[] key) throws Exception {
        return (new BASE64Encoder()).encodeBuffer(key);

    }

    public static Map initKey() throws Exception {
        KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);

        System.out.println("algorithm:"+keyPairGen.getAlgorithm());

        keyPairGen.initialize(1024);

        KeyPair keyPair = keyPairGen.generateKeyPair();

        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();

        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();

        Map keyMap = new HashMap(2);

        keyMap.put(PUBLIC_KEY, publicKey);

        keyMap.put(PRIVATE_KEY, privateKey);

        return keyMap;

    }

    public static void main(String[] args) {
        Map keyMap;

        try {
            keyMap = initKey();

            String publicKey = getPublicKey(keyMap);

            System.out.println("公钥=>"+publicKey);

            String privateKey = getPrivateKey(keyMap);

            System.out.println("私钥=>"+privateKey);

        } catch (Exception e) {
            e.printStackTrace();

        }

    }
}

参考3：https://blog.csdn.net/Tombjp/article/details/96477474?utm_term=SHA1WithRSA%E5%8A%A0%E5%AF%86javarsa&utm_medium=distribute.pc_aggpage_search_result.none-task-blog-2~all~sobaiduweb~default-6-96477474&spm=3001.4430