C配置加密
//自己写的加密，加密方法就是根据输入的密码对文件中的内容进行异或后存放在加密后的文件中
//转载请声明program by STU caige
#include<stdio.h>
#include<stdlib.h>
#include <conio.h>//getche()需要
#include<string.h>
char ch;
//异或函数
int YiHuo(FILE *f0,FILE *fp,int passwordnum,int move,char key)
{
while(fread(&ch,1,1,f0),!feof(f0))
{
if (key==49)//加密
{
ch=ch+move;
(char)(ch^=passwordnum);
fwrite(&ch,1,1,fp);
}
if (key==50)//解密
{
(char)(ch^=passwordnum);
ch=ch+move;
fwrite(&ch,1,1,fp);
}
}
}
int main()
{
//encrypt加密 decrypt解密
FILE *f0,*fe,*fd;
char fname0[50];
char efname[50]={0};
char dfname[50]={0};
char Password[50]={0},key=0,key2=0;
char sysfname[20]={0};
int p=0,passwordnum,move=0;//异或后移动的次数 ;
system("cls");
do
{
system("cls");
do
{
printf("1-----------加密文件\n");
printf("2-----------解密文件\n");
printf("Esc----------退出\n") ;
key=getch();//读入一个键盘码
}
while ((key!='1')&&(key!='2')&&(key!=27));
Password[50]=0;
passwordnum=0;
if (key==49)
{
system("cls");
printf("请输入要加密的文件绝对路径\n");
scanf("%s",fname0);
// while(key=0)
//打开原文件
if ((f0=fopen(fname0,"rb"))==NULL)
{
printf("文件打不开哦！\n");
key=0;//文件打开失败时key的值改变
exit(0);
printf("加密失败\n");
system("pause");
}
//只有文件fname0打开成功时才能继续打开efname
if(key==49)
{
system("cls");
printf("请输入完成加密的文件存储路径\n");
scanf("%s",efname);
if ((fe=fopen(efname,"w+"))==NULL)
{
printf("文件打不开哦！\n");
printf("加密失败\n");
fclose(f0);
system("pause");
exit(0);
key=0;
}
}
//如果打开文件成功则开始输入密码
if(key==49)
{
system("cls");
printf("请输入密码\n");
scanf("%s",Password);
//把字符密码转化为整形来异或
for(p=0;Password[p]!=0;p++)
passwordnum+=((int)Password[p]);
move=(int)(passwordnum%9);
while (move>9)
move=(int)(move%9);
printf("%d",move);system("pause");
}
if (key==49)
{//异或加密
system("cls");
YiHuo(f0,fe,passwordnum,move,key);
printf("\n加密成功，您的输出文件路径为:\n");
printf("%s",efname);
fclose(f0);
fclose(fe);
}
}
if (key==50)
{
system("cls");
printf("请输入要解密的文件绝对路径\n");
scanf("%s",fname0);
// while(key=0)
//打开原文件
if ((f0=fopen(fname0,"rb"))==NULL)
{
printf("文件打不开哦！\n");
key=0;//文件打开失败时key的值改变
exit(0);
printf("解密失败\n");
system("pause");
}
//只有文件fname0打开成功时才能继续打开dfname
if(key==50)
{
system("cls");
printf("请输入完成解密的文件存储路径\n");
scanf("%s",dfname);
if ((fd=fopen(dfname,"w+"))==NULL)
{
printf("解密失败");
fclose(f0);
system("pause");
printf("文件打不开哦！\n");
exit(0);
key=0;
}
}
//如果打开文件成功则开始输入密码
if(key==50)
{
system("cls");
printf("请输入密码\n");
scanf("%s",Password);
//把字符密码转化为整形来异或
for(p=0;Password[p]!=0;p++)
passwordnum+=((int)Password[p]);
move=(int)(passwordnum%9);
while (move>9)
move=(int)(move%9);
move=(-move);
}
if (key==50)
{//异或加密
system("cls");
YiHuo(f0,fd,passwordnum,move,key);
printf("\n解密成功，您的输出文件路径为:\n%S",dfname);
system("pause");
fclose(f0);
fclose(fd);
}
}
}
while(key!=27);//当key为0，即读写两个文件都打开成功时才结束循环
return 0;
printf("\n谢谢使用!，program by STU caige\n");
system("pause");
}
② c语言编写加密程序
#include <stdio.h>
#include <string.h>
#include "global.h"
#include "md5.h"
#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21
static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char
[64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned
int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
static unsigned char PADDING[64] = {
0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
#define FF(a, b, c, d, x, s, ac) { (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); (a) = ROTATE_LEFT ((a), (s)); (a) += (b);}
#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
void MD5Init (context)
MD5_CTX *context;
{
context->count[0] = context->count[1] = 0;
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}
void MD5Update (context, input, inputLen)
MD5_CTX *context;
unsigned char *input;
unsigned int inputLen;
{
unsigned int i, index, partLen;
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
if ((context->count[0] += ((UINT4)inputLen << 3))< ((UINT4)inputLen << 3))
context->count[1]++;
context->count[1] += ((UINT4)inputLen >> 29);
partLen = 64 - index;
if (inputLen >= partLen)
{
MD5_memcpy((POINTER)&context->buffer[index], (POINTER)input, partLen);
MD5Transform (context->state, context->buffer);
for (i = partLen; i + 63 < inputLen; i += 64)
MD5Transform (context->state, &input[i]);
index = 0;
}
else
i = 0;
MD5_memcpy((POINTER)&context->buffer[index], (POINTER)&input[i],inputLen-i);
}
void MD5Final (digest, context)
unsigned char digest[16];
MD5_CTX *context;
{
unsigned char bits[8];
unsigned int index, padLen;
Encode (bits, context->count, 8);
index = (unsigned int)((context->count[0] >> 3) & 0x3f);
padLen = (index < 56) ? (56 - index) : (120 - index);
MD5Update (context, PADDING, padLen);
MD5Update (context, bits, 8);
Encode (digest, context->state, 16);
MD5_memset ((POINTER)context, 0, sizeof (*context));
}
static void MD5Transform (UINT4 state[4], unsigned char block[64])
{
UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
Decode (x, block, 64);
FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
/* Round 2 */
GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
/* Round 3 */
HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
/* Round 4 */
II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
MD5_memset ((POINTER)x, 0, sizeof (x));
}
static void Encode (output, input, len)
unsigned char *output;
UINT4 *input;
unsigned int len;
{
unsigned int i, j;
for (i = 0, j = 0; j < len; i++, j += 4)
{
output[j] = (unsigned char)(input[i] & 0xff);
output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
}
}
static void Decode (output, input, len)
UINT4 *output;
unsigned char *input;
unsigned int len;
{
unsigned int i, j;
for (i = 0, j = 0; j < len; i++, j += 4)
output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |(((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
}
static void MD5_memcpy (output, input, len)
POINTER output;
POINTER input;
unsigned int len;
{
unsigned int i;
for (i = 0; i < len; i++)
output[i] = input[i];
}
static void MD5_memset (output, value, len)
POINTER output;
int value;
unsigned int len;
{
unsigned int i;
for (i = 0; i < len; i++)
((char *)output)[i] = (char)value;
}
#ifndef MD
#define MD 5
#endif
#define TEST_BLOCK_LEN 1000
#define TEST_BLOCK_COUNT 1000
static void MDString PROTO_LIST ((char *));
static void MDPrint PROTO_LIST ((unsigned char [16]));
#define MD_CTX MD5_CTX
#define MDInit MD5Init
#define MDUpdate MD5Update
#define MDFinal MD5Final
int main (int argc, char *argv[])
{
int i;
if (argc > 1)
{ MDString(argv[1]);
return (0);
}
}
static void MDString (char *string)
{
MD_CTX context;
unsigned char digest[16];
unsigned int len = strlen (string);
MDInit (&context);
MDUpdate (&context, string, len);
MDFinal (digest, &context);
printf ("MD%d (\"%s\") = ", MD, string);
MDPrint (digest);
printf ("\n");
}
static void MDPrint (unsigned char digest[16])
{
unsigned int i;
for (i = 0; i < 16; i++)
printf ("%02x", digest[i]);
}
③ C语言 文件加密解密
加密：
#include<stdio.h>
#include<stdlib.h>
#include<conio.h>
#include<string.h>
void dofile(char *in_fname,char *pwd,char *out_fname);/*对文件进行加密的具体函数*/
void main(int argc,char *argv[])/*定义main()函数的命令行参数*/
{
char in_fname[30];/*用户输入的要加密的文件名*/
char out_fname[30];
char pwd[8];/*用来保存密码*/
if(argc!=4){/*容错处理*/
printf("\nIn-fname:\n");
gets(in_fname);/*得到要加密的文件名*/
printf("Password:\n");
gets(pwd);/*得到密码*/
printf("Out-file:\n");
gets(out_fname);/*得到加密后你要的文件名*/
dofile(in_fname,pwd,out_fname);
}
else{/*如果命令行参数正确,便直接运行程序*/
strcpy(in_fname,argv[1]);
strcpy(pwd,argv[2]);
strcpy(out_fname,argv[3]);
dofile(in_fname,pwd,out_fname);
}
}
/*加密子函数开始*/
void dofile(char *in_fname,char *pwd,char *out_file)
{
FILE *fp1,*fp2;
register char ch;
int j=0;
int j0=0;
fp1=fopen(in_fname,"rb");
if(fp1==NULL){
printf("cannot open in-file.\n");
exit(1);/*如果不能打开要加密的文件,便退出程序*/
}
fp2=fopen(out_file,"wb");
if(fp2==NULL){
printf("cannot open or create out-file.\n");
exit(1);/*如果不能建立加密后的文件,便退出*/
}
while(pwd[++j0]);
ch=fgetc(fp1);
/*加密算法开始*/
while(!feof(fp1)){
fputc(ch^pwd[j>=j0?j=0:j++],fp2);/*异或后写入fp2文件*/
ch=fgetc(fp1);
}
fclose(fp1);/*关闭源文件*/
fclose(fp2);/*关闭目标文件*/
}
/*程序结束*/
④ 用C语言给文件加密解密，详细简单的代码；；；；用c打开一txt文件，怎么写【新手初学】
#include<stdio.h>
#include<stdlib.h>
#include<conio.h>
#include<string.h>
void dofile(char *in_fname,char *pwd,char out_file)
{
FILE *fp1,*fp2;
register char ch;
int j=0;
int j0=0;
fp1=fopen(in_fname,"rb");
if(fp1==NULL)
{
printf("cannot open in-file.\n");
exit(1); //如果逗启不能打开要加密的文件，便退出程序、
}
fp2=fopen(out_file,"wb");
if(fp2==NULL)
{
printf("cannot open or create out-file.\n");
exit(1); //如果不能建立加密后的文件，便退出
}
while(pwd[++j0]);
ch=fgetc(fp1); //加密算法开始
while(!feof(fp1))
{
fputc(ch^pwd[j>j0?j=0:j++],fp2); //异或后写山指如入fp2文件
ch=fgetc(fp1);
}
fclose(fp1);
fclose(fp2);
}
void main(int argc,char *argv[])
{
char in_fname[30];
char out_fname[30];
char pwd[8];
if(argc!=4)
{
printf("\nIn-fname:\n");
gets(in_fname);
printf("Password:\n");
gets(pwd);
printf("Out-file:\逗耐n");
gets(out_fname);
dofile(in_fname,pwd,out_fname);
}
else
{
strcpy(in_fname,argv[1]);
strcpy(pwd,argv[2]);
strcpy(out_fname,argv[3]);
dofile(in_fname,pwd,out_fname);
}
}
⑤ C语言密码加密，求解释
很高兴能为你解答！这是一个很普通的程序。
char a[5];这串代码的意思是（定义一个字符数组元素为5个）。
for(i=0;i<5;i++)
{
scanf("%c",&a[i]);
}这串代码的意思是（用了一个for循环条件为5次，每次要求用户输入一个字符，共输入五次）。
for(m=0;m<5;m++)
{
a[m]=a[m]+4;
}这串代码也是一个循环体，循环五次，每次都会进行运算表达式，a[m]=a[m]+4;这里的是每次将a[m]+4在赋给a[m]。如果还有什么不明白可以追问。
⑥ 怎样用C给字符加密
利用ASC码，字符与数字的对应关系，你可以将任意字符加上任意规律的数字输出，反之则解密。
⑦ C语言数字加密
#include
void
main()
{
int
a[5];
/*
存储各位上的数字
*/
int
num,
temp,
encripy;
/*
num是要输入的数，temp是交换时用来存储临时值，encripy是加密后的数据
*/
int
i;
do
{
printf("please
input
the
number:");
scanf("%d",&num);
if(!(num/10000
!=0
&&
num/100000==0))
printf("data
error!\n");
}while(!(num/10000
!=0
&&
num/100000==0));
a[0]
=
num/10000%10;
/*
求各位上的数字
*/
a[1]
=
num/1000%10;
a[2]
=
num/100%10;
/*
百位上的数字
*/
a[3]
=
num/10%10;
/*
十位上的数字
*/
a[4]
=
num%10;
/*
个位上的数字
*/
for(i
=
0;
i
<
5;
++i)
/*
开始加密
*/
a[i]
=
(a[i]
+
8)%10;
temp
=
a[0];
/*
交换位置开始
*/
a[0]
=
a[3];
a[3]
=
temp;
temp
=
a[1];
a[1]
=
a[2];
a[2]
=
temp;
/*
交换位置结束同时加密结束
*/
encripy
=
a[0]*10000
+
a[1]*1000
+
a[2]*100
+
a[3]*10
+
a[4];
/*
加密后的数据
*/
printf("\nthe
scourse
number:
%d\n",
num);
/*
输出原数据
*/
printf("\nencripy
the
number:
%d\n\n",
encripy);
/*
输出加密后的数据
*/
}
在vc6.0成功运行，希望对你有帮助!
⑧ 用C语言实现任意字符串的加密，其中，字母用凯撒加密方法加密，非字母不变
我尽量用注释阐述了思路，希望可以帮到你！！
#include<stdio.h>
#include<string.h>
#define N 80 //可加密字符串最大长度
char plaintext[N]={0}; //明文，输入时输入字符，参与运算时强制转换成整数
int ciphertext[N]={0}; //密文，保存成整数，输出时强制转换成字符
int k; //后(右)移位数，相当于密钥
void getPlainText() //获得明文字符串
{
printf("请输入明文:");
scanf("%s",plaintext);
printf("\n");
}
void getLength() //获取后(右)移位数(密钥)
{
printf("请输入后移的位数:");
scanf("%d",&k);
k%=26; //因为字母只有26个，所以超过26相当于重复
}
void Caesar_cipher() //凯撒加密，本程序采用的是字母循环后(右)移
{
unsigned int i;
for(i=0;i<strlen(plaintext);i++)
{
//两个bool类型的变量是为了判断字符是否是字母(包括大写和小写)
bool flag1=plaintext[i]>='a'&&plaintext[i]<='z';
bool flag2=plaintext[i]>='A'&&plaintext[i]<='Z';
if(flag1||flag2){ //如果是字母，加密
ciphertext[i]=(int)plaintext[i]+k; //字母在字母表中后(右)移K位
if(ciphertext[i]>(int)'z'){ //保证是循环后(右)移
ciphertext[i]-=26;
}
}
else //非字母字符，不做处理，原样保存
ciphertext[i]=(int)plaintext[i];
}
}
void printCipherText() //输出加密后的密文
{
unsigned int i;
printf("\n加密后的密文是:");
for(i=0;i<strlen(plaintext);i++) //把参与计算后是整数强制转换成对应的字符
printf("%c",(char)ciphertext[i]);
printf("\n");
}
void main()
{
getPlainText(); //明文
getLength(); //后(右)移位数
Caesar_cipher(); //凯撒加密
printCipherText(); //密文
}