前言:項(xiàng)目需要根據(jù)秘鑰加密, 客戶端根據(jù)公鑰解密, 這里使用RSA加解密

在項(xiàng)目中導(dǎo)入openssl的動(dòng)態(tài)鏈接庫(kù), libeay32.dll, libeay32.lib, 配置好工程環(huán)境, 代碼:

/**
* @author:  HanshuaiWu
* @methodsName: encrypt
* @description: 簽名
* @param1:  orgData:原數(shù)據(jù)
* @param2:  publicKey:公鑰
* @return: AnsiString
* @createTime: 2018/11/9
*/
extern "C" {
AnsiString TIDCard::encrypt(AnsiString orgData)
{      //C:\Users\Administrator\Desktop\移動(dòng)服務(wù)器v1.0網(wǎng)絡(luò)請(qǐng)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為源文件長(zhǎng)度， rsa_len為秘鑰長(zhǎng)度


     //1.打開秘鑰文件
     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.獲取秘鑰的長(zhǎng)度
     rsa_len = RSA_size(p_rsa);

     //4.為加密后的內(nèi)容 申請(qǐng)空間（根據(jù)秘鑰的長(zhǎng)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編碼
AnsiString TIDCard::Encode(const unsigned char* Data,int DataByte)
{
    //編碼表
    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;
        }
    }
    //對(duì)剩余數(shù)據(jù)進(jìn)行編碼
    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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