前言:项目需要根据秘钥加密, 客户端根据公钥解密, 这里使用RSA加解密

在项目中导入openssl的动态链接库, libeay32.dll, libeay32.lib, 配置好工程环境, 代码:

/**
* @author:  HanshuaiWu
* @methodsName: encrypt
* @description: 签名
* @param1:  orgData:原数据
* @param2:  publicKey:公钥
* @return: AnsiString
* @createTime: 2018/11/9
*/
extern "C" {
AnsiString TIDCard::encrypt(AnsiString orgData)
{      //C:\Users\Administrator\Desktop\移动服务器v1.0网络请求\CardServerV2\Output\key.pem


     char *p_en = NULL;
     RSA *p_rsa = NULL;
     FILE *file = NULL;
     AnsiString pathStr = "key.pem";
     char *path_key = (char *)pathStr.c_str();
     int  rsa_len = 0;    //flen为源文件长度， rsa_len为秘钥长度


     //1.打开秘钥文件
     if((file = fopen(path_key, "r")) == NULL)
     {
         return-1;
     }

     BIO *in = NULL;
     in = BIO_new(BIO_s_file());
     if( BIO_read_filename(in, path_key) != 1)
     {
        return -1;
     }

     if(in == NULL){
       return -1;
     }

     p_rsa = PEM_read_bio_RSAPrivateKey(in , NULL, NULL, NULL);

     //3.获取秘钥的长度
     rsa_len = RSA_size(p_rsa);

     //4.为加密后的内容 申请空间（根据秘钥的长度)
     p_en = (char *)malloc(rsa_len);
     if(!p_en)
     {
          return -1;
     }
     memset(p_en, 0, rsa_len);
       int length =  orgData.Length();
       char *orgBuffer = (char *) malloc(length);;
       orgBuffer = (char *)AnsiToUtf8(orgData).c_str();

       int len = RSA_private_encrypt(strlen(orgBuffer), orgBuffer, p_en, p_rsa, RSA_PKCS1_PADDING);
       AnsiString result = Encode(p_en, len);
        //  free
    free_all:
    fclose(file);
    BIO_free_all(in);
    RSA_free(p_rsa);
    free(p_en);
    free(orgBuffer);
       return result;
}
}
// base64编码
AnsiString TIDCard::Encode(const unsigned char* Data,int DataByte)
{
    //编码表
    const char EncodeTable[]="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    //返回值
    AnsiString strEncode;
    unsigned char Tmp[4]={0};
    int LineLength=0;
    for(int i=0;i<(int)(DataByte / 3);i++)
    {
        Tmp[1] = *Data++;
        Tmp[2] = *Data++;
        Tmp[3] = *Data++;
        strEncode+= EncodeTable[Tmp[1] >> 2];
        strEncode+= EncodeTable[((Tmp[1] << 4) | (Tmp[2] >> 4)) & 0x3F];
        strEncode+= EncodeTable[((Tmp[2] << 2) | (Tmp[3] >> 6)) & 0x3F];
        strEncode+= EncodeTable[Tmp[3] & 0x3F];
        if(LineLength+=4,LineLength==76) {
                //strEncode+="\r\n";
                LineLength=0;
        }
    }
    //对剩余数据进行编码
    int Mod=DataByte % 3;
    if(Mod==1)
    {
        Tmp[1] = *Data++;
        strEncode+= EncodeTable[(Tmp[1] & 0xFC) >> 2];
        strEncode+= EncodeTable[((Tmp[1] & 0x03) << 4)];
        strEncode+= "==";
    }
    else if(Mod==2)
    {
        Tmp[1] = *Data++;
        Tmp[2] = *Data++;
        strEncode+= EncodeTable[(Tmp[1] & 0xFC) >> 2];
        strEncode+= EncodeTable[((Tmp[1] & 0x03) << 4) | ((Tmp[2] & 0xF0) >> 4)];
        strEncode+= EncodeTable[((Tmp[2] & 0x0F) << 2)];
        strEncode+= "=";
    }

    return strEncode;
}

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