java使用AES加密，c++使用crypto++解密

柔光的暖阳◎ 2022-04-17 07:12 635阅读 0赞

最近在做一个项目，需要用到加密解密，java端用AES加密了，准备把加好密的数据发送到c++写的服务端（crypto++开源库）。搞了几天，从不会到会，配置差点把我搞疯了，太它妈的蛋疼。

编译器：vs2017

开源库：crypto++    官网：[https://blog.csdn.net/qq\_34227896/article/details/84028740][https_blog.csdn.net_qq_34227896_article_details_84028740]

使用文档：[https://www.cryptopp.com/wiki/Category:Sample][https_www.cryptopp.com_wiki_Category_Sample]

我用的是cryptopp-CRYPTOPP\_7\_0\_0这个版本。

当然你也不需要拿到后自己来生成，你也直接可以下载我生成好的lib包和include包

[https://download.csdn.net/download/qq\_34227896/10784601][https_download.csdn.net_download_qq_34227896_10784601]

首先要环境配置：

1、下载后解压。如图：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MjI3ODk2_size_16_color_FFFFFF_t_70][]

2、在文件里找到cryptest.sln启动，如图：

![20181114154752439.png][]

3、会出现如下图所示的四个文件，点击cryptlib右键生成。（注：此时你可根据自己的项目需要选择64还是32生成，也可选择是生成MT还是MD的）

![20181114155004553.png][]

4、最后把在output下生成的lib文件拷贝到自己的项目中，并把.h文件拷贝过去（自己可以建个目录存放）

![20181114155425878.png][]![20181114155617534.png][]

5、最后就是在vs里使用配置路劲（大家都会，就不多说了）。

然后就是代码：java代码

import javax.crypto.Cipher;
    import javax.crypto.spec.IvParameterSpec;
    import javax.crypto.spec.SecretKeySpec;
    import java.util.Arrays;
    
    //import org.apache.commons.codec.binary.Base64;
    
    public class Encryptor {
    
        /**
         * 字符串转换成十六进制字符串
         */
        public static String str2HexStr(String str) {
    
            char[] chars = "0123456789ABCDEF".toCharArray();
            StringBuilder sb = new StringBuilder("");
            byte[] bs = str.getBytes();
            int bit;
            for (int i = 0; i < bs.length; i++) {
                bit = (bs[i] & 0x0f0) >> 4;
                sb.append(chars[bit]);
                bit = bs[i] & 0x0f;
                sb.append(chars[bit]);
            }
            return sb.toString();
        }
    
        /**
         *
         * 十六进制转换字符串
         */
    
        public static byte[] hexStr2Bytes(String hexStr) {
            System.out.println("in len :" + hexStr.length());
            String str = "0123456789ABCDEF";
            char[] hexs = hexStr.toCharArray();
            byte[] bytes = new byte[hexStr.length() / 2];
            int n;
            for (int i = 0; i < bytes.length; i++) {
                n = str.indexOf(hexs[2 * i]) * 16;
                n += str.indexOf(hexs[2 * i + 1]);
                bytes[i] = (byte) (n & 0xff);
            }
            System.out.println("out len :" + bytes.length);
            System.out.println("ddd" + Arrays.toString(bytes));
            return bytes;
        }
    
        /**
         * bytes转换成十六进制字符串
         */
        public static String byte2HexStr(byte[] b) {
            String hs = "";
            String stmp = "";
            for (int n = 0; n < b.length; n++) {
                stmp = (Integer.toHexString(b[n] & 0XFF));
                if (stmp.length() == 1)
                    hs = hs + "0" + stmp;
                else
                    hs = hs + stmp;
                // if (n<b.length-1) hs=hs+":";
            }
            return hs.toUpperCase();
        }
    
        public static String encrypt(String key, String initVector, String value) {
            try {
                System.out.println("key:\t" + Arrays.toString(key.getBytes("UTF-8")));
                System.out.println("iv:\t" + Arrays.toString(initVector.getBytes("UTF-8")));
                IvParameterSpec iv = new IvParameterSpec(initVector.getBytes("UTF-8"));
                SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes("UTF-8"), "AES");
    
                Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
                //Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
                cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
    
                byte[] encrypted = cipher.doFinal(value.getBytes());
                System.out.println(Arrays.toString(encrypted));
                //System.out.println("encrypted string: "
                //        + Base64.encodeBase64String(encrypted));
    
                return byte2HexStr(encrypted);
                //return Base64.encodeBase64String(encrypted);
            } catch (Exception ex) {
                ex.printStackTrace();
            }
    
            return null;
        }
    
        public static String decrypt(String key, String initVector, String encrypted) {
            try {
                IvParameterSpec iv = new IvParameterSpec(initVector.getBytes("UTF-8"));
                SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes("UTF-8"), "AES");
    
                Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
                cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
    
                //byte[] original = cipher.doFinal(Base64.decodeBase64(encrypted));
                byte[] original = cipher.doFinal(hexStr2Bytes(encrypted));
    
                return new String(original);
            } catch (Exception ex) {
                ex.printStackTrace();
            }
    
            return null;
        }
    
        public static void main(String[] args) {
            String key = "1234567890123456"; // 128 bit key
            String initVector = "0000000000000000"; // 16 bytes IV
    
            String en = encrypt(key, initVector, "hello world, cryptopp");
            System.out.println(en);
            System.out.println(decrypt(key, initVector, en));
        }
    }

编译运行输出：

➜  cypherTest javac Encryptor.java
    ➜  cypherTest java Encryptor
    key:    [49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54]
    iv:    [48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48]
    [2, -46, -51, -100, 37, -49, 11, 72, -29, -122, -15, -49, -44, -40, -17, -69, -14, -69, -112, -20, -124, 98, -8, 108, -88, 33, 23, 19, -66, 3, -48, -59]
    02D2CD9C25CF0B48E386F1CFD4D8EFBBF2BB90EC8462F86CA8211713BE03D0C5
    in len :64
    out len :32
    ddd[2, -46, -51, -100, 37, -49, 11, 72, -29, -122, -15, -49, -44, -40, -17, -69, -14, -69, -112, -20, -124, 98, -8, 108, -88, 33, 23, 19, -66, 3, -48, -59]
    hello world, cryptopp

c++代码段

xxx.h文件

#ifndef CRYPTOPP_H
    #define CRYPTOPP_H
    
    #include <iostream>
    #include <fstream>
    #include <sstream>
    
    #include <cryptopp/aes.h>
    #include <cryptopp/filters.h>
    #include <cryptopp/modes.h>
    
    
    
    class cryptopp {
    public:
        static bool init(const std::string& key, const std::string& iv);
        static std::string encrypt(const std::string& inputPlainText);
        static std::string decrypt(const std::string& cipherTextHex);
    private:
        static byte s_key[CryptoPP::AES::DEFAULT_KEYLENGTH];
        static byte s_iv[CryptoPP::AES::DEFAULT_KEYLENGTH];
    };
    #endif

xxxx.cpp文件

#include "cryptopp.h"
    
    using namespace std;
    
    void print(const string& cipherText) {
        cout << "[";
        for( unsigned int i = 0; i < cipherText.size(); i++ )
        {
            cout << int(cipherText[i]) << ", "  ;
        }
        cout << "]"<< endl;
    }
    
    byte cryptopp::s_key[CryptoPP::AES::DEFAULT_KEYLENGTH];
    byte cryptopp::s_iv[CryptoPP::AES::DEFAULT_KEYLENGTH];
    
    bool cryptopp::init(const string& key, const string& iv) {
        if (key.size() != CryptoPP::AES::DEFAULT_KEYLENGTH) {
            return false;
        }
        if (iv.size() != CryptoPP::AES::BLOCKSIZE) {
            return false;
        }
    
        for(int i = 0; i < CryptoPP::AES::DEFAULT_KEYLENGTH; i++) {
            s_key[i] = key[i];
        }
        for(int i = 0; i < CryptoPP::AES::BLOCKSIZE; i++) {
            s_iv[i] = iv[i];
        }
        //memset(s_key, 0x00, CryptoPP::AES::DEFAULT_KEYLENGTH);
        //memset(s_iv, 0x00, CryptoPP::AES::BLOCKSIZE);
        return true;
    }
    
    
    
    string cryptopp::encrypt(const string& plainText)
    {
        /*
        if ((plainText.length() % CryptoPP::AES::BLOCKSIZE) != 0) {
            return "";
        }
        */
    
        string cipherTextHex;
        try {
            string cipherText;
            CryptoPP::AES::Encryption aesEncryption(s_key, CryptoPP::AES::DEFAULT_KEYLENGTH);
            CryptoPP::CBC_Mode_ExternalCipher::Encryption cbcEncryption( aesEncryption, s_iv);
            //CryptoPP::StreamTransformationFilter stfEncryptor(cbcEncryption, new CryptoPP::StringSink( cipherText ), CryptoPP::StreamTransformationFilter::NO_PADDING);
            CryptoPP::StreamTransformationFilter stfEncryptor(cbcEncryption, new CryptoPP::StringSink( cipherText ));
            stfEncryptor.Put( reinterpret_cast<const unsigned char*>( plainText.c_str() ), plainText.length() );
            stfEncryptor.MessageEnd();
    
            print(cipherText);
            for( unsigned int i = 0; i < cipherText.size(); i++ )
            {
                char ch[3] = {0};
                sprintf_s(ch,sizeof(ch), "%02x",  static_cast<byte>(cipherText[i]));
                cipherTextHex += ch;
            }
        } catch (const std::exception &e) {
            cipherTextHex = "";
        }
    
        return cipherTextHex;
    }
    
    string cryptopp::decrypt(const string& cipherTextHex)
    {
        /*
        if(cipherTextHex.empty()) {
            return string();
        }
        if ((cipherTextHex.length() % CryptoPP::AES::BLOCKSIZE) != 0) {
            return string();
        }
        */
    
        string cipherText;
        string decryptedText;
    
        unsigned int i = 0;
        while(true)
        {
            char c;
            int x;
            stringstream ss;
            ss<<hex<<cipherTextHex.substr(i, 2).c_str();
            ss>>x;
            c = (char)x;
            cipherText += c;
            if(i >= cipherTextHex.length() - 2)break;
            i += 2;
        }
    
        try {
            CryptoPP::AES::Decryption aesDecryption(s_key, CryptoPP::AES::DEFAULT_KEYLENGTH);
            CryptoPP::CBC_Mode_ExternalCipher::Decryption cbcDecryption( aesDecryption, s_iv );
            //CryptoPP::StreamTransformationFilter stfDecryptor(cbcDecryption, new CryptoPP::StringSink( decryptedText ),CryptoPP::StreamTransformationFilter::NO_PADDING);
            CryptoPP::StreamTransformationFilter stfDecryptor(cbcDecryption, new CryptoPP::StringSink( decryptedText ));
            stfDecryptor.Put( reinterpret_cast<const unsigned char*>( cipherText.c_str() ), cipherText.size());
    
            stfDecryptor.MessageEnd();
        } catch (const std::exception &e) {
            decryptedText = "";
        }
    
        return decryptedText;
    }
    
    int main() {
        cryptopp::init("1234567890123456", "0000000000000000");
        string en = cryptopp::encrypt("hello world, cryptopp");
        cout << en << endl;
        cout << cryptopp::decrypt(en) << endl;
    }

代码编辑输出:

$./a.out
    [2, -46, -51, -100, 37, -49, 11, 72, -29, -122, -15, -49, -44, -40, -17, -69, -14, -69, -112, -20, -124, 98, -8, 108, -88, 33, 23, 19, -66, 3, -48, -59, ]
    02d2cd9c25cf0b48e386f1cfd4d8efbbf2bb90ec8462f86ca8211713be03d0c5
    hello world, cryptopp

[https_blog.csdn.net_qq_34227896_article_details_84028740]: https://blog.csdn.net/qq_34227896/article/details/84028740
[https_www.cryptopp.com_wiki_Category_Sample]: https://www.cryptopp.com/wiki/Category:Sample
[https_download.csdn.net_download_qq_34227896_10784601]: https://download.csdn.net/download/qq_34227896/10784601
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MjI3ODk2_size_16_color_FFFFFF_t_70]: /images/20220417/6fe4e8519f6f455bb7da45c3427032a9.png
[20181114154752439.png]: /images/20220417/941b42f409f741c190ca390993bd8d31.png
[20181114155004553.png]: /images/20220417/f6d71d39a1ac475884c8151dab8bc06d.png
[20181114155425878.png]: https://img-blog.csdnimg.cn/20181114155425878.png
[20181114155617534.png]: /images/20220417/185486a1381f466f99dfd23f2de2fccf.png