生成 RSA 密钥对并将 public 编码为字符串 [英] Generate RSA key pair and encode public as string

问题描述

我想生成 512 位 RSA 密钥对，然后将我的公钥编码为字符串.我怎样才能做到这一点?

I want to generate 512 bit RSA keypair and then encode my public key as a string. How can I achieve this?

推荐答案

For output as Hex-String

For output as Hex-String

import java.security.*;
public class Test {
    public static void main(String[] args) throws NoSuchAlgorithmException, NoSuchProviderException {
        KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");
        keyGen.initialize(512);
        byte[] publicKey = keyGen.genKeyPair().getPublic().getEncoded();
        StringBuffer retString = new StringBuffer();
        for (int i = 0; i < publicKey.length; ++i) {
            retString.append(Integer.toHexString(0x0100 + (publicKey[i] & 0x00FF)).substring(1));
        }
        System.out.println(retString);
    }
}

作为字节值输出

import java.security.*;
public class Test {
    public static void main(String[] args) throws NoSuchAlgorithmException, NoSuchProviderException {
        KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");
        keyGen.initialize(512);
        byte[] publicKey = keyGen.genKeyPair().getPublic().getEncoded();
        StringBuffer retString = new StringBuffer();
        retString.append("[");
        for (int i = 0; i < publicKey.length; ++i) {
            retString.append(publicKey[i]);
            retString.append(", ");
        }
        retString = retString.delete(retString.length()-2,retString.length());
        retString.append("]");
        System.out.println(retString); //e.g. [48, 92, 48, .... , 0, 1]
    }
}

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