[C語言]mac下Des CBC加密

加密步驟如下：

1）首先將資料按照8個位元組一組進行分組得到D1D2......Dn（若資料不是8的整數倍，用指定的PADDING資料補位）

2）第一組資料D1與初始化向量I異或後的結果進行DES加密得到第一組密文C1（初始化向量I為全零）

3）第二組資料D2與第一組的加密結果C1異或以後的結果進行DES加密，得到第二組密文C2

4）之後的資料以此類推，得到Cn

5）按順序連為C1C2C3......Cn即為加密結果。

3Des.h檔案

#ifndef _3DES#define _3DES#include <strings.h>#ifdef __cplusplusextern "C"{#endif /* __cplusplus */    unsigned char* GetKey(unsigned char *RandomData);    void  DesEncrypt_ECB(unsigned char *key, unsigned char *data);    unsigned char* DesEncrypt_CBC(unsigned char *key, unsigned char *data,int len);#ifdef __cplusplus};#endif /* __cplusplus */#endif /* defined(_3DES) */

3Des.cpp檔案

#include "3DES.h"#include "DES.h"#include <iostream>unsigned char* GetKey(unsigned char *RandomData){    unsigned char* key=(unsigned char*)malloc(16);    for (int i=0; i<16; i++) {        key[i]=0xFF;    }    unsigned char RevertData[8]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};    for (int i=0; i<sizeof(RevertData); i++) {        RevertData[i]=~RandomData[i];    }        DesEncrypt_ECB(key, RandomData);    DesEncrypt_ECB(key, RevertData);        for (int i=0; i<16; i++) {        if(i<8)            key[i]=RandomData[i];        else            key[i]=RevertData[i-8];    }    return key;}void  DesEncrypt_ECB(unsigned char *key, unsigned char *data){    DesEncrypt(key,data);DesDecrypt(key,data);DesEncrypt(key,data);}unsigned char*  DesEncrypt_CBC(unsigned char *key, unsigned char *data, int len){    unsigned char* data2=(unsigned char*)malloc(8);unsigned char data3[8];    int sum=len/8+1;    int yushu=len%8;    for (int i=0;i<sum;i++) {        for (int j=0; j<8; j++) {            if(i<sum-1){                data2[j]=data[i*8+j];                if(j==7&&i==0){                    DesEncrypt(key, data2);                    for (int k=0; k<8; k++) {                        data3[k]=data2[k];                    }                }else if(j==7&&i>0){                    for (int k=0; k<8; k++) {                        data2[k]^=data3[k];                    }                    DesEncrypt(key, data2);                    for (int k=0; k<8; k++) {                        data3[k]=data2[k];                    }                }            }else if(yushu==0&&i==sum-1&&j==7){data2[0]=0x80;for(int k=1;k<8;k++){data2[k]=0x00;}                for (int k=0; k<8; k++) {                    data2[k]^=data3[k];                }                DesEncrypt(key, data2);                            }else if(yushu>0){                if(j<yushu){                    data2[j]=data[i*8+j];                }else if(j==yushu){                    data2[j]=0x80;                }else if(j>yushu&&j!=7){                    data2[j]=0x00;                }else if(j==7){                    data2[j]=0x00;                    for (int k=0; k<8; k++) {                        data2[k]^=data3[k];                    }                    DesEncrypt(key, data2);                }                            }        }    }    return data2;}

main函數

unsigned char RandomData[16]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};    unsigned char* key=GetKey(RandomData);                unsigned char data[17]={0x14,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF};unsigned char* macdata=DesEncrypt_CBC(key,data,sizeof(data));    for (int i=0; i<8; i++) {        printf("%x\n",macdata[i]);    }    free(macdata);    free(key);