android 与 java后端 rsa 加密解密互通（整理修改别人的）

缥缈神

758人浏览 · 2020-12-04 11:11:36

缥缈神 · 2020-12-04 11:11:36 发布

后端工具

package com.kingyon.backend.snake;

import java.io.ByteArrayOutputStream;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Base64;

import javax.crypto.Cipher;

//java 后端
public class RsaUtlis {
    //私钥
    private static String privateKey = "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";
    //公钥
    private static String publicKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDLgWW8OXrJM9kNpw23mL3GjYHbky1ILJ5D50NHcdPtbnPI/y6XsVPmaL0IZdJJikfuJ7M6ika6Z8lKwnvdxh7fzauzyB4jLEsyrgqn76aG32sp3tvTbV8+821WvsPDIr9bpzJMDHi7ZH0A0T9NLpYHPZ20oPTVrXjYE+AtVXzj4wIDAQAB";
    /**
     * RSA最大加密明文大小
     */
    private static final int MAX_ENCRYPT_BLOCK = 117;

    /**
     * RSA最大解密密文大小
     */
    private static final int MAX_DECRYPT_BLOCK = 128;

    /**
     * 获取密钥对
     *
     * @return 密钥对
     */
    public static KeyPair getKeyPair() throws Exception {
        KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA");
        generator.initialize(1024);
        return generator.generateKeyPair();
    }

    /**
     * 获取私钥
     *
     * @param privateKey 私钥字符串
     * @return
     */
    public static PrivateKey getPrivateKey(String privateKey) throws Exception {
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");

        byte[] decodedKey = Base64.getDecoder().decode(privateKey.getBytes());
        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(decodedKey);
        return keyFactory.generatePrivate(keySpec);
    }

    /**
     * 获取公钥
     *
     * @param publicKey 公钥字符串
     * @return
     */
    public static PublicKey getPublicKey(String publicKey) throws Exception {
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        byte[] decodedKey = Base64.getDecoder().decode(publicKey.getBytes());
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(decodedKey);
        return keyFactory.generatePublic(keySpec);
    }

    /**
     * RSA加密
     *
     * @param data      待加密数据
     * @param publicKey 公钥
     * @return
     */
    public static String encrypt(String data, PublicKey publicKey) throws Exception {
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        int inputLen = data.getBytes().length;
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        int offset = 0;
        byte[] cache;
        int i = 0;
        // 对数据分段加密
        while (inputLen - offset > 0) {
            if (inputLen - offset > MAX_ENCRYPT_BLOCK) {
                cache = cipher.doFinal(data.getBytes(), offset, MAX_ENCRYPT_BLOCK);
            } else {
                cache = cipher.doFinal(data.getBytes(), offset, inputLen - offset);
            }
            out.write(cache, 0, cache.length);
            i++;
            offset = i * MAX_ENCRYPT_BLOCK;
        }
        byte[] encryptedData = out.toByteArray();
        out.close();
        // 获取加密内容使用base64进行编码,并以UTF-8为标准转化成字符串
        // 加密后的字符串
        return new String(Base64.getEncoder().encode((encryptedData)));
    }

    /**
     * RSA解密
     *
     * @param data       待解密数据
     * @param privateKey 私钥
     * @return
     */
    public static String decrypt(String data, PrivateKey privateKey) throws Exception {
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, privateKey);
        byte[] dataBytes = Base64.getDecoder().decode(data);
        int inputLen = dataBytes.length;
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        int offset = 0;
        byte[] cache;
        int i = 0;
        // 对数据分段解密
        while (inputLen - offset > 0) {
            if (inputLen - offset > MAX_DECRYPT_BLOCK) {
                cache = cipher.doFinal(dataBytes, offset, MAX_DECRYPT_BLOCK);
            } else {
                cache = cipher.doFinal(dataBytes, offset, inputLen - offset);
            }
            out.write(cache, 0, cache.length);
            i++;
            offset = i * MAX_DECRYPT_BLOCK;
        }
        byte[] decryptedData = out.toByteArray();
        out.close();
        // 解密后的内容
        return new String(decryptedData, "UTF-8");
    }

    /**
     * 签名
     *
     * @param data       待签名数据
     * @param privateKey 私钥
     * @return 签名
     */
    public static String sign(String data, PrivateKey privateKey) throws Exception {
        byte[] keyBytes = privateKey.getEncoded();
        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PrivateKey key = keyFactory.generatePrivate(keySpec);
        Signature signature = Signature.getInstance("MD5withRSA");
        signature.initSign(key);
        signature.update(data.getBytes());
        return new String(Base64.getEncoder().encode(signature.sign()));
    }

    /**
     * 验签
     *
     * @param srcData   原始字符串
     * @param publicKey 公钥
     * @param sign      签名
     * @return 是否验签通过
     */
    public static boolean verify(String srcData, PublicKey publicKey, String sign) throws Exception {
        byte[] keyBytes = publicKey.getEncoded();
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PublicKey key = keyFactory.generatePublic(keySpec);
        Signature signature = Signature.getInstance("MD5withRSA");
        signature.initVerify(key);
        signature.update(srcData.getBytes());
        return signature.verify(Base64.getDecoder().decode(sign.getBytes()));
    }

    public static void main(String[] args) {
        try {
            // 生成密钥对
//            KeyPair keyPair = getKeyPair();
//            String privateKey = new String(Base64.getEncoder().encode(keyPair.getPrivate().getEncoded()));
//            String publicKey = new String(Base64.getEncoder().encode(keyPair.getPublic().getEncoded()));
//            System.out.println("私钥:" + privateKey);
//            System.out.println("公钥:" + publicKey);
            // RSA加密
            String data = "待加密的文字内容";
            String encryptData = encrypt(data, getPublicKey(publicKey));
            System.out.println("加密后内容:" + encryptData);
            // RSA解密
            String decryptData = decrypt("encryptData ", getPrivateKey(privateKey));
            System.out.println("解密后内容:" + decryptData);

            // RSA签名
            String sign = sign(data, getPrivateKey(privateKey));
            // RSA验签
            boolean result = verify(data, getPublicKey(publicKey), sign);
            System.out.print("验签结果:" + result);
        } catch (Exception e) {
            e.printStackTrace();
            System.out.print("加解密异常");
        }
    }
}

android 端工具

package com.yjd.qimingwang.utlis;

import android.os.Build;
import android.util.Base64;

import androidx.annotation.RequiresApi;

import java.io.ByteArrayOutputStream;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import javax.crypto.Cipher;
//android
public class RsaUtlis{
    //私钥
    public static String privateKey="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";
    //公钥
    public static String publicKey="MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDLgWW8OXrJM9kNpw23mL3GjYHbky1ILJ5D50NHcdPtbnPI/y6XsVPmaL0IZdJJikfuJ7M6ika6Z8lKwnvdxh7fzauzyB4jLEsyrgqn76aG32sp3tvTbV8+821WvsPDIr9bpzJMDHi7ZH0A0T9NLpYHPZ20oPTVrXjYE+AtVXzj4wIDAQAB";
    /**
     * RSA最大加密明文大小
     */
    private static final int MAX_ENCRYPT_BLOCK = 117;

    /**
     * RSA最大解密密文大小
     */
    private static final int MAX_DECRYPT_BLOCK = 128;

    /**
     * 获取密钥对
     *
     * @return 密钥对
     */
    public static KeyPair getKeyPair() throws Exception {
        KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA");
        generator.initialize(1024);
        return generator.generateKeyPair();
    }

    /**
     * 获取私钥
     *
     * @param privateKey 私钥字符串
     * @return
     */
    public static PrivateKey getPrivateKey(String privateKey) throws Exception {
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");

        byte[] decodedKey =Base64.decode(privateKey.getBytes(), Base64.DEFAULT);
        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(decodedKey);
        return keyFactory.generatePrivate(keySpec);
    }

    /**
     * 获取公钥
     *
     * @param publicKey 公钥字符串
     * @return
     */
    public static PublicKey getPublicKey(String publicKey) throws Exception {
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        byte[] decodedKey =Base64.decode(publicKey.getBytes(), Base64.DEFAULT);
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(decodedKey);
        return keyFactory.generatePublic(keySpec);
    }

    /**
     * RSA加密
     *
     * @param data 待加密数据
     * @param publicKey 公钥
     * @return
     */
    public static String encrypt(String data, PublicKey publicKey) throws Exception {
        Cipher cipher ;
        cipher= Cipher.getInstance("RSA/ECB/PKCS1Padding");
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        int inputLen = data.getBytes().length;
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        int offset = 0;
        byte[] cache;
        int i = 0;
        // 对数据分段加密
        while (inputLen - offset > 0) {
            if (inputLen - offset > MAX_ENCRYPT_BLOCK) {
                cache = cipher.doFinal(data.getBytes(), offset, MAX_ENCRYPT_BLOCK);
            } else {
                cache = cipher.doFinal(data.getBytes(), offset, inputLen - offset);
            }
            out.write(cache, 0, cache.length);
            i++;
            offset = i * MAX_ENCRYPT_BLOCK;
        }
        byte[] encryptedData = out.toByteArray();
        out.close();
        // 获取加密内容使用base64进行编码,并以UTF-8为标准转化成字符串
        // 加密后的字符串
        return new String(Base64.encode(encryptedData, Base64.DEFAULT));
    }

    /**
     * RSA解密
     *
     * @param data 待解密数据
     * @param privateKey 私钥
     * @return
     */
    public static String decrypt(String data, PrivateKey privateKey) throws Exception {
        Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
        cipher.init(Cipher.DECRYPT_MODE, privateKey);
        byte[] dataBytes = Base64.decode(data, Base64.DEFAULT);
        int inputLen = dataBytes.length;
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        int offset = 0;
        byte[] cache;
        int i = 0;
        // 对数据分段解密
        while (inputLen - offset > 0) {
            if (inputLen - offset > MAX_DECRYPT_BLOCK) {
                cache = cipher.doFinal(dataBytes, offset, MAX_DECRYPT_BLOCK);
            } else {
                cache = cipher.doFinal(dataBytes, offset, inputLen - offset);
            }
            out.write(cache, 0, cache.length);
            i++;
            offset = i * MAX_DECRYPT_BLOCK;
        }
        byte[] decryptedData = out.toByteArray();
        out.close();
        // 解密后的内容
        return new String(decryptedData, "UTF-8");
    }

    /**
     * 签名
     *
     * @param data 待签名数据
     * @param privateKey 私钥
     * @return 签名
     */
    public static String sign(String data, PrivateKey privateKey) throws Exception {
        byte[] keyBytes = privateKey.getEncoded();
        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PrivateKey key = keyFactory.generatePrivate(keySpec);
        Signature signature = Signature.getInstance("MD5withRSA");
        signature.initSign(key);
        signature.update(data.getBytes());
        return new String(Base64.encode(signature.sign(), Base64.DEFAULT));
    }

    /**
     * 验签
     *
     * @param srcData 原始字符串
     * @param publicKey 公钥
     * @param sign 签名
     * @return 是否验签通过
     */
    public static boolean verify(String srcData, PublicKey publicKey, String sign) throws Exception {
        byte[] keyBytes = publicKey.getEncoded();
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PublicKey key = keyFactory.generatePublic(keySpec);
        Signature signature = Signature.getInstance("MD5withRSA");
        signature.initVerify(key);
        signature.update(srcData.getBytes());
        return signature.verify(Base64.decode(sign.getBytes(), Base64.DEFAULT));
    }

    @RequiresApi(api = Build.VERSION_CODES.KITKAT)
    public static void main(String[] args) {
        try {
            // 生成密钥对
//            KeyPair keyPair = getKeyPair();
//            String privateKey = new String(Base64.getEncoder().encode(keyPair.getPrivate().getEncoded()));
//            String publicKey = new String(Base64.getEncoder().encode(keyPair.getPublic().getEncoded()));
//            System.out.println("私钥:" + privateKey);
//            System.out.println("公钥:" + publicKey);
            // RSA加密
            String data = "待加密的文字内容";
            String encryptData = encrypt(data, getPublicKey(publicKey));
            System.out.println("加密后内容:" + encryptData);
            // RSA解密
            String decryptData = decrypt(encryptData, getPrivateKey(privateKey));
            System.out.println("解密后内容:" + decryptData);

            // RSA签名
            String sign = sign(data, getPrivateKey(privateKey));
            // RSA验签
            boolean result = verify(data, getPublicKey(publicKey), sign);
            System.out.print("验签结果:" + result);
        } catch (Exception e) {
            e.printStackTrace();
            System.out.print("加解密异常");
        }
    }
}

java与Android的区别

一、Base64用法区别

Android Base64加密解密用 Android.utlis.Base64下面的类

1. Base64.encode("str", Base64.DEFAULT);

2. Base64.decode(data, Base64.DEFAULT)

JAVA Base64加密解密用的是java.utlis.Base64下面的类

1. Base64.getEncoder().encode((encryptedData))

2. Base64.getDecoder().decode(privateKey.getBytes())

二、Cipher初始化

java 初始化方式：

Cipher cipher = Cipher.getInstance("RSA");

cipher.init(Cipher.ENCRYPT_MODE, publicKey);

Android 初始化方式：

Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
cipher.init(Cipher.DECRYPT_MODE, publicKey);

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缥缈神

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android 与 java后端 rsa 加密解密互通 （整理修改别人的）

缥缈神

后端工具

android 端工具

java与Android的区别

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android 与 java后端 rsa 加密解密互通（整理修改别人的）