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She Drifted Away With The Wind, Beyond The Reach Of My Wildest Dreams. Not Even RSA Algorithms Can..

赵才俊
2023-12-01
package com.sf.test;

import org.apache.commons.codec.binary.Base64;

import javax.crypto.Cipher;
import java.nio.charset.StandardCharsets;
import java.security.*;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;

public class RSAUtil {

    private static Map<Integer, String> KEY_MAP = new HashMap<>();
    private static String PRIVATE_KEY_STR;
    private static String PUBLIC_KEY_STR;

    static {
        try {
            KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
            keyPairGenerator.initialize(1024, new SecureRandom());
            KeyPair keyPair = keyPairGenerator.genKeyPair();
            PrivateKey privateKey = keyPair.getPrivate();
            PublicKey publicKey = keyPair.getPublic();
            String privateKeyStr = new String(Base64.encodeBase64(privateKey.getEncoded()));
            String publicKeyStr = new String(Base64.encodeBase64(publicKey.getEncoded()));
            KEY_MAP.put(0, privateKeyStr);
            KEY_MAP.put(1, publicKeyStr);

            PRIVATE_KEY_STR = KEY_MAP.get(0);
            PUBLIC_KEY_STR = KEY_MAP.get(1);

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

    public static String encrypt(String str, String publicKeyStr) throws Exception {
        byte[] decoded = Base64.decodeBase64(publicKeyStr);
        PublicKey publicKey = KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(decoded));
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        String outStr = Base64.encodeBase64String(cipher.doFinal(str.getBytes(StandardCharsets.UTF_8)));
        return outStr;
    }

    public static String decrypt(String str, String privateKeyStr) throws Exception {
        byte[] inputBytes = Base64.decodeBase64(str.getBytes(StandardCharsets.UTF_8));
        byte[] decoded = Base64.decodeBase64(privateKeyStr);
        PrivateKey privateKey = KeyFactory.getInstance("RSA").generatePrivate(new PKCS8EncodedKeySpec(decoded));
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, privateKey);
        String outStr = new String(cipher.doFinal(inputBytes));
        return outStr;
    }

    public static String encrypt(String str) throws Exception {
        return encrypt(str, PUBLIC_KEY_STR);
    }

    public static String decrypt(String str) throws Exception {
        return decrypt(str, PRIVATE_KEY_STR);
    }

    public static void main(String[] args) {
        try {
            String str = "Whenever I looked back, time blocked my path to retreat.";
            String encryptedStr = RSAUtil.encrypt(str);
            System.out.println(encryptedStr);
            System.out.println(decrypt(encryptedStr));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

 

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