文章目录
- 一、文件加密解密操作
- 1、解密整 4096 字节的数据
- 2、解密小于 4096 字节的数据
- 二、完整代码示例
- 1、文件加密操作 main.c
- 2、DES 加密解密头文件 des.h
- 3、第三方 DES 加密解密函数库源码 des.c
一、文件加密解密操作
准备
个文件 , 一个是原始文件 , 一个是加密后的文件 , 将原始文件进行加密 , 然后将加密后的数据输出到加密文件中 ;
代码语言：javascript复制 // 要解密的文件
const char *input_file= "D:/File/config_encode.ini";
// 解密后的文件
const char *output_file = "D:/File/config_decode.ini";
// 将 要加密的 input_file 文件加密 , 并输出到 output_file 文件中
ret = file_decode(input_file, output_file);1、解密整 4096 字节的数据
打开输入文件 , 每次从输入文件中 , 读取
字节数据 , 将这
字节数据解密 , 然后写出到解密文件中 ;
代码语言：javascript复制 // 循环读取输入文件中的数据
while (!feof(fp_in))
{
// 尝试从输入文件中读取 4K 数据
input_len = fread(input_buffer, 1, 4096, fp_in);
// 如果读取完毕 , 直接退出
if (feof(fp_in))
{
break;
}
// 解密 4096 字节数据
ret = des_decode_raw(input_buffer, input_len, output_buffer, &output_len);
// 如果加密失败, 直接退出
if (ret != 0)
{
printf("error : des_encode_raw n", ret);
goto END;
}
// 将解密后的数据 , 写出到输出文件中
output_tmplen = fwrite(output_buffer, 1, output_len, fp_out);
// 如果写出失败 , 直接退出
if (output_tmplen != output_len)
{
ret = -3;
printf("error : fwriten");
goto END;
}
}2、解密小于 4096 字节的数据
如果读取的数据小于
字节 , 会退出循环 , 执行下面的业务逻辑 ;
下面的函数主要是 解密小于 4096 字节数据 , 加密完成后 , 将解密数据输出到文件中 ;
代码语言：javascript复制 // 解密小于 4096 字节数据
ret = des_decode(input_buffer, input_len, output_buffer, &output_len);
// 加密失败 , 直接退出
if (ret != 0)
{
printf("error : des_decode n", ret);
goto END;
}
// 将解密后的数据 , 写出到输出文件中
output_tmplen = fwrite(output_buffer, 1, output_len, fp_out);
// 如果写出失败 , 直接退出
if (output_len != output_tmplen)
{
ret = -3;
printf("error : fwriten");
goto END;
}二、完整代码示例
1、文件加密操作 main.c
代码语言：javascript复制#define _CRT_SECURE_NO_WARNINGS
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "des.h"
/**
* @brief file_encode 文件加密
* @param input_file 被加密的文件
* @param output_file 加密后的文件
* @return
*/
int file_encode(const char *input_file, const char *output_file)
{
// 用于接收各个步骤的返回值 , 做校验
int ret = 0;
// 输入 文件 指针
FILE *fp_in= NULL;
// 输出 文件 指针
FILE *fp_out = NULL;
// 输入缓冲区 , 大小 4K
unsigned char input_buffer[4096] = {0};
// 输入数据字节数
int input_len = 0;
// 输出文件缓冲区
unsigned char output_buffer[4096] = {0};
// 输出数据字节数
int output_len = 0;
// 输出数据写出字节数 , 用于与上面的 output_len 进行对比
// 一般情况下这两个值相等 , 如果出错 , 直接退出程序
int output_tmplen;
// 打开输入文件
fp_in = fopen(input_file, "rb");
if (fp_in == NULL)
{
goto END;
}
// 打开输出文件
fp_out = fopen(output_file, "wb");
if (fp_out == NULL)
{
goto END;
}
// 循环读取输入文件中的数据
while (!feof(fp_in))
{
// 尝试从输入文件中读取 4K 数据
input_len = fread(input_buffer, 1, 4096, fp_in);
// 如果读取完毕 , 直接退出
if (feof(fp_in))
{
break;
}
// 加密 4096 字节数据
ret = des_encode_raw(input_buffer, input_len, output_buffer, &output_len);
// 如果加密失败, 直接退出
if (ret != 0)
{
printf("error : des_encode_raw n", ret);
goto END;
}
// 将加密后的数据 , 写出到输出文件中
output_tmplen = fwrite(output_buffer, 1, output_len, fp_out);
// 如果写出失败 , 直接退出
if (output_tmplen != output_len)
{
ret = -3;
printf("error : fwriten");
goto END;
}
}
// 加密小于 4096 字节数据
ret = des_encode(input_buffer, input_len, output_buffer, &output_len);
// 加密失败 , 直接退出
if (ret != 0)
{
printf("error : des_encode n", ret);
goto END;
}
// 将加密后的数据 , 写出到输出文件中
output_tmplen = fwrite(output_buffer, 1, output_len, fp_out);
// 如果写出失败 , 直接退出
if (output_len != output_tmplen)
{
ret = -3;
printf("error : fwriten");
goto END;
}
END:
// 关闭输入文件
if (fp_in != NULL)
{
fclose(fp_in);
}
// 关闭输出文件
if (fp_out != NULL)
{
fclose(fp_out);
}
return 0;
}
int main_encode()
{
// 接收 子函数 返回值
int ret = 0;
// 要加密的文件
const char *input_file= "D:/File/config.ini";
// 加密后的文件
const char *output_file = "D:/File/config_encode.ini";
// 将 要加密的 input_file 文件加密 , 并输出到 output_file 文件中
ret = file_encode(input_file, output_file);
// 加密失败
if (ret != 0)
{
printf("error : file_encodern " );
return ret;
}
system("pause");
return ret;
}
/**
* @brief file_decode 文件解密
* @param input_file 被加密的文件
* @param output_file 加密后的文件
* @return
*/
int file_decode(const char *input_file, const char *output_file)
{
// 用于接收各个步骤的返回值 , 做校验
int ret = 0;
// 输入 文件 指针
FILE *fp_in= NULL;
// 输出 文件 指针
FILE *fp_out = NULL;
// 输入缓冲区 , 大小 4K
unsigned char input_buffer[4096] = {0};
// 输入数据字节数
int input_len = 0;
// 输出文件缓冲区
unsigned char output_buffer[4096] = {0};
// 输出数据字节数
int output_len = 0;
// 输出数据写出字节数 , 用于与上面的 output_len 进行对比
// 一般情况下这两个值相等 , 如果出错 , 直接退出程序
int output_tmplen;
// 打开输入文件
fp_in = fopen(input_file, "rb");
if (fp_in == NULL)
{
goto END;
}
// 打开输出文件
fp_out = fopen(output_file, "wb");
if (fp_out == NULL)
{
goto END;
}
// 循环读取输入文件中的数据
while (!feof(fp_in))
{
// 尝试从输入文件中读取 4K 数据
input_len = fread(input_buffer, 1, 4096, fp_in);
// 如果读取完毕 , 直接退出
if (feof(fp_in))
{
break;
}
// 解密 4096 字节数据
ret = des_decode_raw(input_buffer, input_len, output_buffer, &output_len);
// 如果加密失败, 直接退出
if (ret != 0)
{
printf("error : des_encode_raw n", ret);
goto END;
}
// 将解密后的数据 , 写出到输出文件中
output_tmplen = fwrite(output_buffer, 1, output_len, fp_out);
// 如果写出失败 , 直接退出
if (output_tmplen != output_len)
{
ret = -3;
printf("error : fwriten");
goto END;
}
}
// 解密小于 4096 字节数据
ret = des_decode(input_buffer, input_len, output_buffer, &output_len);
// 加密失败 , 直接退出
if (ret != 0)
{
printf("error : des_decode n", ret);
goto END;
}
// 将解密后的数据 , 写出到输出文件中
output_tmplen = fwrite(output_buffer, 1, output_len, fp_out);
// 如果写出失败 , 直接退出
if (output_len != output_tmplen)
{
ret = -3;
printf("error : fwriten");
goto END;
}
END:
// 关闭输入文件
if (fp_in != NULL)
{
fclose(fp_in);
}
// 关闭输出文件
if (fp_out != NULL)
{
fclose(fp_out);
}
return 0;
}
int main_decode()
{
// 接收 子函数 返回值
int ret = 0;
// 要解密的文件
const char *input_file= "D:/File/config_encode.ini";
// 解密后的文件
const char *output_file = "D:/File/config_decode.ini";
// 将 要加密的 input_file 文件加密 , 并输出到 output_file 文件中
ret = file_decode(input_file, output_file);
// 加密失败
if (ret != 0)
{
printf("error : file_encodern " );
return ret;
}
system("pause");
return ret;
}
int main()
{
// 文件加密
//main_encode();
// 文件解密
main_decode();
system("pause");
return 0;
}2、DES 加密解密头文件 des.h
代码语言：javascript复制/*********************************************************
* des.h
* DES 加密算法头文件
*********************************************************/
#ifndef _DES_H_
#define _DES_H_
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief des_encode_raw DES 加密操作 , 加密 4096 字节数据
* @param in_data 输入数据
* @param in_data_len 输入数据长度
* @param out_data 输出数据
* @param out_data_len 输出数据长度
* @return
*/
int des_encode_raw(
unsigned char *in_data,
int in_data_len,
unsigned char *out_data,
int *out_data_len);
/**
* @brief des_encode DES 加密操作 , 加密少于 4096 字节数据
* @param in_data 输入数据
* @param in_data_len 输入数据长度
* @param out_data 输出数据
* @param out_data_len 输出数据长度
* @return
*/
int des_encode(
unsigned char *in_data,
int in_data_len,
unsigned char *out_data,
int *out_data_len);
/**
* @brief des_decode_raw DES 解密操作 , 解密 4096 字节
* @param in_data 输入数据
* @param in_data_len 输入数据长度
* @param out_data 输出数据
* @param out_data_len 输出数据长度
* @return
*/
int des_decode_raw(
unsigned char *in_data,
int in_data_len,
unsigned char *out_data,
int *out_data_len);
/**
* @brief des_decode DES 解密操作 , 解密少于 4096 字节
* @param in_data 输入数据
* @param in_data_len 输入数据长度
* @param out_data 输出数据
* @param out_data_len 输出数据长度
* @return
*/
int des_decode(
unsigned char *in_data,
int in_data_len,
unsigned char *out_data,
int *out_data_len);
#ifdef __cplusplus
}
#endif
#endif3、第三方 DES 加密解密函数库源码 des.c
代码语言：javascript复制/******************************************************
*
* des.c
* common des......
*
******************************************************/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "des.h"
/*********************************************************
data type definition for Des;
**********************************************************/
#define EN0 0
#define DE1 1
#define DES_KEYBYTES 128
#define DES_KEYLONGS 32
#define DES_BLOCKLEN 8
typedef struct {
unsigned char ek[DES_KEYBYTES];
int ekLen;
unsigned char dk[DES_KEYBYTES];
int dkLen;
unsigned char CbcCtx[DES_BLOCKLEN];
} DES_CTX;
typedef struct {
unsigned char ek1[DES_KEYBYTES];
int ek1Len;
unsigned char dk1[DES_KEYBYTES];
int dk1Len;
unsigned char ek2[DES_KEYBYTES];
int ek2Len;
unsigned char dk2[DES_KEYBYTES];
int dk2Len;
unsigned char CbcCtx[DES_BLOCKLEN];
//int IsFirstBlock;
} DES3_CTX;
static unsigned char pc1[56] = {
56, 48, 40, 32, 24, 16, 8, 0, 57, 49, 41, 33, 25, 17,
9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35,
62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21,
13, 5, 60, 52, 44, 36, 28, 20, 12, 4, 27, 19, 11, 3 };
static unsigned char pc2[48] = {
13, 16, 10, 23, 0, 4, 2, 27, 14, 5, 20, 9,
22, 18, 11, 3, 25, 7, 15, 6, 26, 19, 12, 1,
40, 51, 30, 36, 46, 54, 29, 39, 50, 44, 32, 47,
43, 48, 38, 55, 33, 52, 45, 41, 49, 35, 28, 31 };
static unsigned short bytebit[8] = {0200,0100,040,020,010,04,02,01 };
static unsigned char totrot[16] = {1,2,4,6,8,10,12,14,15,17,19,21,23,25,27,28};
static unsigned long bigbyte[24] = {
0x800000L, 0x400000L, 0x200000L, 0x100000L,
0x80000L, 0x40000L, 0x20000L, 0x10000L,
0x8000L, 0x4000L, 0x2000L, 0x1000L,
0x800L, 0x400L, 0x200L, 0x100L,
0x80L, 0x40L, 0x20L, 0x10L,
0x8L, 0x4L, 0x2L, 0x1L };
//insert digits
static unsigned long SP1[64] ={
0x01010400l,0x00000000l,0x00010000l,0x01010404l,
0x01010004l,0x00010404l,0x00000004l,0x00010000l,
0x00000400l,0x01010400l,0x01010404l,0x00000400l,
0x01000404l,0x01010004l,0x01000000l,0x00000004l,
0x00000404l,0x01000400l,0x01000400l,0x00010400l,
0x00010400l,0x01010000l,0x01010000l,0x01000404l,
0x00010004l,0x01000004l,0x01000004l,0x00010004l,
0x00000000l,0x00000404l,0x00010404l,0x01000000l,
0x00010000l,0x01010404l,0x00000004l,0x01010000l,
0x01010400l,0x01000000l,0x01000000l,0x00000400l,
0x01010004l,0x00010000l,0x00010400l,0x01000004l,
0x00000400l,0x00000004l,0x01000404l,0x00010404l,
0x01010404l,0x00010004l,0x01010000l,0x01000404l,
0x01000004l,0x00000404l,0x00010404l,0x01010400l,
0x00000404l,0x01000400l,0x01000400l,0x00000000l,
0x00010004l,0x00010400l,0x00000000l,0x01010004l };
static unsigned long SP2[64]={
0x80108020l,0x80008000l,0x00008000l,0x00108020l,
0x00100000l,0x00000020l,0x80100020l,0x80008020l,
0x80000020l,0x80108020l,0x80108000l,0x80000000l,
0x80008000l,0x00100000l,0x00000020l,0x80100020l,
0x00108000l,0x00100020l,0x80008020l,0x00000000l,
0x80000000l,0x00008000l,0x00108020l,0x80100000l,
0x00100020l,0x80000020l,0x00000000l,0x00108000l,
0x00008020l,0x80108000l,0x80100000l,0x00008020l,
0x00000000l,0x00108020l,0x80100020l,0x00100000l,
0x80008020l,0x80100000l,0x80108000l,0x00008000l,
0x80100000l,0x80008000l,0x00000020l,0x80108020l,
0x00108020l,0x00000020l,0x00008000l,0x80000000l,
0x00008020l,0x80108000l,0x00100000l,0x80000020l,
0x00100020l,0x80008020l,0x80000020l,0x00100020l,
0x00108000l,0x00000000l,0x80008000l,0x00008020l,
0x80000000l,0x80100020l,0x80108020l,0x00108000l };
static unsigned long SP3[64]={
0x00000208l,0x08020200l,0x00000000l,0x08020008l,
0x08000200l,0x00000000l,0x00020208l,0x08000200l,
0x00020008l,0x08000008l,0x08000008l,0x00020000l,
0x08020208l,0x00020008l,0x08020000l,0x00000208l,
0x08000000l,0x00000008l,0x08020200l,0x00000200l,
0x00020200l,0x08020000l,0x08020008l,0x00020208l,
0x08000208l,0x00020200l,0x00020000l,0x08000208l,
0x00000008l,0x08020208l,0x00000200l,0x08000000l,
0x08020200l,0x08000000l,0x00020008l,0x00000208l,
0x00020000l,0x08020200l,0x08000200l,0x00000000l,
0x00000200l,0x00020008l,0x08020208l,0x08000200l,
0x08000008l,0x00000200l,0x00000000l,0x08020008l,
0x08000208l,0x00020000l,0x08000000l,0x08020208l,
0x00000008l,0x00020208l,0x00020200l,0x08000008l,
0x08020000l,0x08000208l,0x00000208l,0x08020000l,
0x00020208l,0x00000008l,0x08020008l,0x00020200l };
static unsigned long SP4[64]={
0x00802001l,0x00002081l,0x00002081l,0x00000080l,
0x00802080l,0x00800081l,0x00800001l,0x00002001l,
0x00000000l,0x00802000l,0x00802000l,0x00802081l,
0x00000081l,0x00000000l,0x00800080l,0x00800001l,
0x00000001l,0x00002000l,0x00800000l,0x00802001l,
0x00000080l,0x00800000l,0x00002001l,0x00002080l,
0x00800081l,0x00000001l,0x00002080l,0x00800080l,
0x00002000l,0x00802080l,0x00802081l,0x00000081l,
0x00800080l,0x00800001l,0x00802000l,0x00802081l,
0x00000081l,0x00000000l,0x00000000l,0x00802000l,
0x00002080l,0x00800080l,0x00800081l,0x00000001l,
0x00802001l,0x00002081l,0x00002081l,0x00000080l,
0x00802081l,0x00000081l,0x00000001l,0x00002000l,
0x00800001l,0x00002001l,0x00802080l,0x00800081l,
0x00002001l,0x00002080l,0x00800000l,0x00802001l,
0x00000080l,0x00800000l,0x00002000l,0x00802080l };
static unsigned long SP5[64]={
0x00000100l,0x02080100l,0x02080000l,0x42000100l,
0x00080000l,0x00000100l,0x40000000l,0x02080000l,
0x40080100l,0x00080000l,0x02000100l,0x40080100l,
0x42000100l,0x42080000l,0x00080100l,0x40000000l,
0x02000000l,0x40080000l,0x40080000l,0x00000000l,
0x40000100l,0x42080100l,0x42080100l,0x02000100l,
0x42080000l,0x40000100l,0x00000000l,0x42000000l,
0x02080100l,0x02000000l,0x42000000l,0x00080100l,
0x00080000l,0x42000100l,0x00000100l,0x02000000l,
0x40000000l,0x02080000l,0x42000100l,0x40080100l,
0x02000100l,0x40000000l,0x42080000l,0x02080100l,
0x40080100l,0x00000100l,0x20000000l,0x42080000l,
0x42080100l,0x00080100l,0x42000000l,0x42080100l,
0x02080000l,0x02000100l,0x40000100l,0x00080000l,
0x00080100l,0x02000100l,0x40000100l,0x00080000l,
0x00000000l,0x40080000l,0x02080100l,0x40000100l };
static unsigned long SP6[64]={
0x20000010l,0x20400000l,0x00004000l,0x20404010l,
0x20400000l,0x00000010l,0x20404010l,0x00400000l,
0x20004000l,0x00404010l,0x00400000l,0x20000010l,
0x00400010l,0x20004000l,0x20000000l,0x00004010l,
0x00000000l,0x00400010l,0x20004010l,0x00004000l,
0x00404000l,0x20004010l,0x00000010l,0x20400010l,
0x20400010l,0x00000000l,0x00404010l,0x20404000l,
0x00004010l,0x00404000l,0x20404000l,0x20000000l,
0x20004000l,0x00000010l,0x20400010l,0x00404000l,
0x20404010l,0x00400000l,0x00004010l,0x20000010l,
0x00400000l,0x20004000l,0x20000000l,0x00004010l,
0x20000010l,0x20404010l,0x00404000l,0x20400000l,
0x00404010l,0x20404000l,0x00000000l,0x20400010l,
0x00000010l,0x00004000l,0x20400000l,0x00404010l,
0x00004000l,0x00400010l,0x20004010l,0x00000000l,
0x20404000l,0x20000000l,0x00400010l,0x20004010l };
static unsigned long SP7[64] = {
0x00200000L, 0x04200002L, 0x04000802L, 0x00000000L,
0x00000800L, 0x04000802L, 0x00200802L, 0x04200800L,
0x04200802L, 0x00200000L, 0x00000000L, 0x04000002L,
0x00000002L, 0x04000000L, 0x04200002L, 0x00000802L,
0x04000800L, 0x00200802L, 0x00200002L, 0x04000800L,
0x04000002L, 0x04200000L, 0x04200800L, 0x00200002L,
0x04200000L, 0x00000800L, 0x00000802L, 0x04200802L,
0x00200800L, 0x00000002L, 0x04000000L, 0x00200800L,
0x04000000L, 0x00200800L, 0x00200000L, 0x04000802L,
0x04000802L, 0x04200002L, 0x04200002L, 0x00000002L,
0x00200002L, 0x04000000L, 0x04000800L, 0x00200000L,
0x04200800L, 0x00000802L, 0x00200802L, 0x04200800L,
0x00000802L, 0x04000002L, 0x04200802L, 0x04200000L,
0x00200800L, 0x00000000L, 0x00000002L, 0x04200802L,
0x00000000L, 0x00200802L, 0x04200000L, 0x00000800L,
0x04000002L, 0x04000800L, 0x00000800L, 0x00200002L };
static unsigned long SP8[64] = {
0x10001040L, 0x00001000L, 0x00040000L, 0x10041040L,
0x10000000L, 0x10001040L, 0x00000040L, 0x10000000L,
0x00040040L, 0x10040000L, 0x10041040L, 0x00041000L,
0x10041000L, 0x00041040L, 0x00001000L, 0x00000040L,
0x10040000L, 0x10000040L, 0x10001000L, 0x00001040L,
0x00041000L, 0x00040040L, 0x10040040L, 0x10041000L,
0x00001040L, 0x00000000L, 0x00000000L, 0x10040040L,
0x10000040L, 0x10001000L, 0x00041040L, 0x00040000L,
0x00041040L, 0x00040000L, 0x10041000L, 0x00001000L,
0x00000040L, 0x10040040L, 0x00001000L, 0x00041040L,
0x10001000L, 0x00000040L, 0x10000040L, 0x10040000L,
0x10040040L, 0x10000000L, 0x00040000L, 0x10001040L,
0x00000000L, 0x10041040L, 0x00040040L, 0x10000040L,
0x10040000L, 0x10001000L, 0x10001040L, 0x00000000L,
0x10041040L, 0x00041000L, 0x00041000L, 0x00001040L,
0x00001040L, 0x00040040L, 0x10000000L, 0x10041000L };
void deskey(unsigned char *key,short edf, unsigned long *kn);
void cookey(register unsigned long *raw1, unsigned long *dough);
//void cpkey(register unsigned long *into);
//void usekey(register unsigned long *from);
//void des(unsigned char *inblock,unsigned char *outblock);
void scrunch(register unsigned char *outof, register unsigned long *into);
void unscrun(register unsigned long *outof, register unsigned char *into);
void desfunc(register unsigned long *block,register unsigned long *keys);
/***************** DES Function *****************/
unsigned long OPENCOMM_DesExpandEncKey(
unsigned char *pbDesKey,
unsigned long ulDesKeyLen,
unsigned char *pbDesEncKey,
unsigned long *ulDesEncKeyLen);
unsigned long OPENCOMM_DesExpandDecKey(
unsigned char *pbDesKey,
unsigned long ulDesKeyLen,
unsigned char *pbDesDecKey,
unsigned long *ulDesDecKeyLen);
unsigned long OPENCOMM_DesEncRaw(
unsigned char *pbDesEncKey,
unsigned long ulDesEncKeyLen,
unsigned char *pbInData,
unsigned long ulInDataLen,
unsigned char *pbOutData,
unsigned long *ulOutDataLen);
unsigned long OPENCOMM_DesDecRaw(
unsigned char *pbDesDecKey,
unsigned long ulDesDecKeyLen,
unsigned char *pbInData,
unsigned long ulInDataLen,
unsigned char *pbOutData,
unsigned long *ulOutDataLen);
int myic_DESDecrypt(
unsigned char *pDesKey,
int nDesKeyLen,
unsigned char *pInData,
int nInDataLen,
unsigned char *pOutData,
int *pOutDataLen);
int myic_DESEncrypt(
unsigned char *pDesKey,
int nDesKeyLen,
unsigned char *pInData,
int nInDataLen,
unsigned char *pOutData,
int *pOutDataLen);
void deskey(unsigned char *key,short edf, unsigned long *kn)
{
register int i, j, l, m, n;
unsigned long pc1m[56],pcr[56];
for ( j = 0; j < 56; j )
{
l = pc1[j];
m = l & 07;
pc1m[j] = (((unsigned long) key[l >> 3] & (unsigned long)bytebit[m] ) ? 1:0);
}
for ( i = 0;i < 16; i )
{
if ( edf == DE1 ) m = (15 - i) << 1;
else m = i << 1;
n = m 1;
kn[m] = kn[n] = 0L;
for ( j = 0; j < 28; j )
{
l = j totrot[i];
if ( l < 28 ) pcr[j] = pc1m[l];
else pcr[j] = pc1m[l-28];
}
for (j = 28; j < 56; j )
{
l = j totrot[i];
if ( l < 56 ) pcr[j] = pc1m[l];
else pcr[j] = pc1m[l-28];
}
for ( j = 0; j < 24; j )
{
if ( pcr[pc2[j]] ) kn[m] |= bigbyte[j];
if ( pcr[pc2[j 24]] ) kn[n] |= bigbyte[j];
}
}
return;
}
void cookey(register unsigned long *raw1, unsigned long *dough)
{
register unsigned long *cook,*raw0;
register int i;
cook = dough;
for ( i = 0; i < 16; i , raw1 ) {
raw0 = raw1 ;
*cook = (*raw0 & 0x00fc0000L) << 6;
*cook |= (*raw0 & 0x00000fc0L) << 10;
*cook |= (*raw1 & 0x00fc0000L) >> 10;
*cook |= (*raw1 & 0x00000fc0L) >> 6;
*cook = (*raw0 & 0x0003f000L) << 12;
*cook |= (*raw0 & 0x0000003fL) << 16;
*cook |= (*raw1 & 0x0003f000L) >> 4;
*cook |= (*raw1 & 0x0000003fL);
}
return;
}
void scrunch(register unsigned char *outof, register unsigned long *into)
{
*into = (*outof & 0xffL) << 24;
*into |= (*outof & 0xffL) << 16;
*into |= (*outof & 0xffL) << 8;
*into |= (*outof & 0xffL);
*into = (*outof & 0xffL) << 24;
*into |= (*outof & 0xffL) << 16;
*into |= (*outof & 0xffL) << 8;
*into |= (*outof & 0xffL);
return;
}
void unscrun(register unsigned long *outof, register unsigned char *into)
{
*into = (unsigned char)((*outof >> 24) & 0xffL);
*into = (unsigned char)((*outof >> 16) & 0xffL);
*into = (unsigned char)((*outof >> 8) & 0xffL);
*into = (unsigned char)( *outof & 0xffL);
*into = (unsigned char)((*outof >> 24) & 0xffL);
*into = (unsigned char)((*outof >> 16) & 0xffL);
*into = (unsigned char)((*outof >> 8) & 0xffL);
*into = (unsigned char)( *outof & 0xffL);
return;
}
void desfunc(register unsigned long *block,register unsigned long *keys)
{
register unsigned long fval, work, right, leftt;
register int round;
leftt = block[0];
right = block[1];
work = ((leftt >> 4) ^ right) & 0x0f0f0f0fL;
right ^= work;
leftt ^= (work << 4);
work = ((leftt >> 16) ^ right) & 0x0000ffffL;
right ^= work;
leftt ^= (work << 16);
work = ((right >> 2) ^ leftt) & 0x33333333L;
leftt ^= work;
right ^= (work << 2);
work = ((right >> 8) ^ leftt) & 0x00ff00ffL;
leftt ^= work;
right ^= (work << 8);
right = ((right << 1) | ((right >>31) & 1L)) & 0xffffffffL;
work = (leftt ^ right) & 0xaaaaaaaaL;
leftt ^= work;
right ^= work;
leftt = ((leftt << 1) | ((leftt >> 31)&1L)) & 0xffffffffL;
for (round = 0; round < 8; round ) {
work = (right << 28) | (right >> 4);
work ^= *keys ;
fval = SP7[ work & 0x3fL];
fval |= SP5[(work >> 8) & 0x3fL];
fval |= SP3[(work >> 16) & 0x3fL];
fval |= SP1[(work >> 24) & 0x3fL];
work = right ^ *keys ;
fval |= SP8[ work & 0x3fL];
fval |= SP6[(work >> 8) & 0x3fL];
fval |= SP4[(work >> 16) & 0x3fL];
fval |= SP2[(work >> 24) & 0x3fL];
leftt ^= fval;
work = (leftt << 28) | (leftt >> 4);
work ^= *keys ;
fval = SP7[ work & 0x3fL];
fval |= SP5[(work >> 8) & 0x3fL];
fval |= SP3[(work >> 16) & 0x3fL];
fval |= SP1[(work >> 24) & 0x3fL];
work = leftt ^ *keys ;
fval |= SP8[ work & 0x3fL];
fval |= SP6[(work >> 8) & 0x3fL];
fval |= SP4[(work >> 16) & 0x3fL];
fval |= SP2[(work >> 24) & 0x3fL];
right ^= fval;
}
right = (right << 31) | (right >> 1);
work = (leftt ^ right) & 0xaaaaaaaaL;
leftt ^= work;
right ^= work;
leftt = (leftt << 31) | (leftt >> 1);
work = ((leftt >> 8) ^ right) & 0x00ff00ffL;
right ^= work;
leftt ^= (work << 8);
work = ((leftt >> 2) ^ right) & 0x33333333L;
right ^= work;
leftt ^= (work << 2);
work = ((right >> 16) ^ leftt) & 0x0000ffffL;
leftt ^= work;
right ^= (work << 16);
work = ((right >> 4) ^ leftt) & 0x0f0f0f0fL;
leftt ^= work;
right ^= (work << 4);
*block = right;
*block = leftt;
return;
}
/*****************************************************************
OPENCOMM_DesExpandEncKey : Expand Des Enc Key 扩展des加密密钥
Return value:
0 : Success
other : failed
Parameters:
pbDesKey : 扩展前的DES密钥(8字节) input
ulDesKeyLen : 扩展前的DES密钥长度 input
pbDesEncKey : 扩展后的DES加密密钥(128字节) output
*ulDesEncKeyLen : 扩展后的DES加密密钥长度 output
*****************************************************************/
unsigned long OPENCOMM_DesExpandEncKey(
unsigned char *pbDesKey,
unsigned long ulDesKeyLen,
unsigned char *pbDesEncKey,
unsigned long *ulDesEncKeyLen)
{
unsigned long kn[32], dough[32];
if (ulDesKeyLen != 8)
return 0xEE20;
deskey(pbDesKey, EN0, kn);
cookey(kn, dough);
*ulDesEncKeyLen = DES_KEYBYTES; //32 long = 128 bytes
memcpy(pbDesEncKey, dough, *ulDesEncKeyLen);
return 0;
}
/*****************************************************************
OPENCOMM_DesExpandDecKey : Expand Des Dec Key 扩展des解密密钥
Return value:
0 : Success
other : failed
Parameters:
pbDesKey : 扩展前的DES密钥(8字节) input
ulDesKeyLen : 扩展前的DES密钥长度 input
pbDesDecKey : 扩展后的DES解密密钥(128字节) output
*ulDesDecKeyLen : 扩展后的DES解密密钥长度 output
*****************************************************************/
unsigned long OPENCOMM_DesExpandDecKey(
unsigned char *pbDesKey,
unsigned long ulDesKeyLen,
unsigned char *pbDesDecKey,
unsigned long *ulDesDecKeyLen)
{
unsigned long kn[32], dough[32];
if (ulDesKeyLen != 8)
return 0xEE20;
deskey(pbDesKey, DE1, kn);
cookey(kn, dough);
*ulDesDecKeyLen = DES_KEYBYTES; //32 long = 128 bytes
memcpy(pbDesDecKey, dough, *ulDesDecKeyLen);
return 0;
}
/****************************************************************
OPENCOMM_DesEncRaw : Des算法加密小整块明文8字节
Return value:
0 : Success
other : failed
Parameters:
pbDesEncKey : DES加密密钥 input
ulDesEncKeyLen : DES加密密钥长度 input
pbInData : 待加密的明文 input
ulInDataLen : 待加密的明文长度 input
pbOutData : 加密后的密文 output
*ulOutDataLen : 加密后的密文长度 output
*****************************************************************/
unsigned long OPENCOMM_DesEncRaw(
unsigned char *pbDesEncKey,
unsigned long ulDesEncKeyLen,
unsigned char *pbInData,
unsigned long ulInDataLen,
unsigned char *pbOutData,
unsigned long *ulOutDataLen)
{
unsigned long work[2], ek[DES_KEYLONGS];
unsigned char cp[DES_BLOCKLEN];
if (ulInDataLen != DES_BLOCKLEN)
return 0xEE20;
if (ulDesEncKeyLen != DES_KEYBYTES)
return 0xEE20;
memcpy(cp, pbInData, DES_BLOCKLEN);
scrunch(cp,work); // 8 bytes -> 2 long
memcpy(ek, pbDesEncKey, ulDesEncKeyLen);
desfunc(work,ek);
unscrun(work,cp); // 2 long -> 8 bytes
memcpy(pbOutData, cp, DES_BLOCKLEN);
*ulOutDataLen = DES_BLOCKLEN;
return 0;
}
/*****************************************************************
OPENCOMM_DesDecRaw : Des算法解密小整块密文8字节
Return value:
0 : Success
other : failed
Parameters:
pbDesDecKey : DES解密密钥 input
ulDesDecKeyLen : DES解密密钥长度 input
pbInData : 待解密的密文 input
ulInDataLen : 待解密的密文长度 input
pbOutData : 解密后的明文 output
*ulOutDataLen : 解密后的明文长度 output
*****************************************************************/
unsigned long OPENCOMM_DesDecRaw(
unsigned char *pbDesDecKey,
unsigned long ulDesDecKeyLen,
unsigned char *pbInData,
unsigned long ulInDataLen,
unsigned char *pbOutData,
unsigned long *ulOutDataLen)
{
unsigned long work[2], dk[DES_KEYLONGS];
unsigned char cp[DES_BLOCKLEN];
if (ulInDataLen != DES_BLOCKLEN)
return 0xEE20;
if (ulDesDecKeyLen != DES_KEYBYTES)
return 0xEE20;
memcpy(cp, pbInData, DES_BLOCKLEN);
scrunch(cp,work); // 8 bytes -> 2 long
memcpy(dk, pbDesDecKey, ulDesDecKeyLen);
desfunc(work,dk);
unscrun(work,cp); // 2 long -> 8 bytes
memcpy(pbOutData, cp, DES_BLOCKLEN);
// des_enc(pbDesEncKey, pbInData, pbOutData);
*ulOutDataLen = DES_BLOCKLEN;
return 0;
}
/********************* DES *********************/
int myic_DESEncrypt(
unsigned char *pDesKey,
int nDesKeyLen,
unsigned char *pInData,
int nInDataLen,
unsigned char *pOutData,
int *pOutDataLen)
{
unsigned char DesKeyBuf[32];
unsigned char DesEncKeyBuf[128];
int EncKeyLen, KeyLen = 0;
int retval = 0, loops, i;
if(nInDataLen%8 != 0)
return 0xEE20;
if(nDesKeyLen != 8)
return 0xEE20;
KeyLen = nDesKeyLen;
memcpy(DesKeyBuf, pDesKey, nDesKeyLen);
retval = OPENCOMM_DesExpandEncKey(DesKeyBuf, KeyLen,
DesEncKeyBuf, (unsigned long *)&EncKeyLen);
if(retval != 0)
return retval;
loops = nInDataLen/8;
for(i = 0; i < loops; i )
{
retval = OPENCOMM_DesEncRaw(DesEncKeyBuf, EncKeyLen, pInData i*8,
8, pOutData i*8, (unsigned long *)pOutDataLen);
if(retval != 0)
return retval;
}
*pOutDataLen = nInDataLen;
return retval;
}
int myic_DESDecrypt(
unsigned char *pDesKey,
int nDesKeyLen,
unsigned char *pInData,
int nInDataLen,
unsigned char *pOutData,
int *pOutDataLen)
{
unsigned char DesKeyBuf[32];
unsigned char DesDecKeyBuf[128];
int DecKeyLen, KeyLen = 0;
int retval = 0, loops, i;
if(nInDataLen%8 != 0)
return 0xEE20;
if(nDesKeyLen != 8)
return 0xEE20;
KeyLen = nDesKeyLen;
memcpy(DesKeyBuf, pDesKey, nDesKeyLen);
retval = OPENCOMM_DesExpandDecKey(DesKeyBuf, KeyLen,
DesDecKeyBuf, (unsigned long *)&DecKeyLen);
if(retval != 0)
return retval;
loops = nInDataLen/8;
for(i = 0; i < loops; i )
{
retval = OPENCOMM_DesDecRaw(DesDecKeyBuf, DecKeyLen, pInData i*8,
8, pOutData i*8, (unsigned long *)pOutDataLen);
if(retval != 0)
return retval;
}
*pOutDataLen = nInDataLen;
return retval;
}
//对称明文数据打pading
void CW_dataPadAdd(int tag, unsigned char *date, unsigned int dateLen,
unsigned char **padDate, unsigned int *padDateLen)
{
int i, padLen;
unsigned char *pTmp = NULL;
pTmp = (unsigned char *)malloc(dateLen 24);
if (pTmp == NULL)
{
*padDate = NULL;
return ;
}
memset(pTmp, 0, dateLen 24);
memcpy(pTmp, date, dateLen);
if (tag == 0)
{
padLen = 8 - dateLen % 8;
for (i=0; i<padLen; i )
{
pTmp[dateLen i] = (char)padLen;
}
*padDateLen = dateLen padLen;
}
else
{
padLen = 16 - dateLen % 16;
for (i=0; i<padLen; i )
{
pTmp[dateLen i] = (char)padLen;
}
}
*padDateLen = dateLen padLen;
*padDate = pTmp;
}
#define USER_PASSWORD_KEY "abcd1234"
//数据加密
int des_encode(
unsigned char *pInData,
int nInDataLen,
unsigned char *pOutData,
int *pOutDataLen)
{
int rv;
unsigned char *padDate = NULL;
unsigned int padDateLen = 0;
CW_dataPadAdd(0, pInData, (unsigned int )nInDataLen, &padDate, &padDateLen);
rv = myic_DESEncrypt((unsigned char *)USER_PASSWORD_KEY, strlen(USER_PASSWORD_KEY),
padDate, (int)padDateLen, pOutData, pOutDataLen);
if (rv != 0)
{
if (padDate != NULL)
{
free(padDate);
}
return rv;
}
if (padDate != NULL)
{
free(padDate);
}
return 0;
}
//数据加密
int des_encode_raw(
unsigned char *pInData,
int nInDataLen,
unsigned char *pOutData,
int *pOutDataLen)
{
int rv;
rv = myic_DESEncrypt((unsigned char *)USER_PASSWORD_KEY, strlen(USER_PASSWORD_KEY),
pInData, (int)nInDataLen, pOutData, pOutDataLen);
if (rv != 0)
{
return rv;
}
return 0;
}
//解密分配内存错误
#define ERR_MALLOC 20
//密码长度不是8的整数倍, 不合法
#define ERR_FILECONT 20
//用户使用函数des解密
int des_decode(
unsigned char *pInData,
int nInDataLen,
unsigned char *pOutData,
int *pOutDataLen)
{
int rv;
char padChar;
unsigned char *tmpPlain = NULL;
tmpPlain = (unsigned char *)malloc(nInDataLen 24);
if (tmpPlain == NULL)
{
return ERR_MALLOC;
}
memset(tmpPlain, 0, nInDataLen 24);
//解密
rv = myic_DESDecrypt((unsigned char *)USER_PASSWORD_KEY, strlen(USER_PASSWORD_KEY),
pInData, nInDataLen, tmpPlain, pOutDataLen);
if (rv != 0)
{
if (tmpPlain != NULL) free(tmpPlain);
return rv;
}
//去pading
padChar = tmpPlain[*pOutDataLen - 1];
if ( (int)padChar<=0 || (int)padChar>8) //异常处理
{
if (tmpPlain) free(tmpPlain);
return ERR_FILECONT;
}
*pOutDataLen = *pOutDataLen - (int)padChar;
//memset(tmpPlain *pOutDataLen, 0, (int)padChar);
memcpy(pOutData, tmpPlain, *pOutDataLen);
if (tmpPlain) free(tmpPlain);
return 0;
}
//用户使用函数des解密
int des_decode_raw(
unsigned char *pInData,
int nInDataLen,
unsigned char *pOutData,
int *pOutDataLen)
{
int rv;
//解密
rv = myic_DESDecrypt((unsigned char *)USER_PASSWORD_KEY, strlen(USER_PASSWORD_KEY),
pInData, nInDataLen, pOutData, pOutDataLen);
if (rv != 0)
{
return rv;
}
return 0;
}
