編寫一個加密的程序

① c語言編寫加密程序

#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]);

}

② C語言設計一個簡單的加密解密程序

C語言設計一個簡單的加密解密程序如下：
加密程序代碼：
#include<stdio.h>
main()
{
char c,filename[20];
FILE *fp1,*fp2;
printf("請輸入待加密的文件名:\n");
scanf("%s",filename);
fp1=fopen(filename,"r");
fp2=fopen("miwen.txt","w");
do
{
c=fgetc(fp1);
if(c>=32&&c<=126)
{
c=c-32;
c=126-c;
}
if(c!=-1)
fprintf(fp2,"%c",c);
}
while(c!=-1);
}
解密程序代碼：
#include<stdio.h>
#include<string.h>
main()
{
char c,filename[20];
char yanzhengma[20];
FILE *fp1,*fp2;
printf("請輸入待解密文件名:\n");
scanf("%s",filename);
printf("請輸入驗證碼:\n");
scanf("%s",yanzhengma);
if(strcmp(yanzhengma,"shan")==0)
{
fp1=fopen(filename,"r");
fp2=fopen("yuanwen.txt","w");
do
{
c=fgetc(fp1);
if(c>=32&&c<=126)
{
c=126-c;
c=32+c;
}
if(c!=-1)
fprintf(fp2,"%c",c);
}
while(c!=-1);
}
else
{
printf("驗證碼錯誤！請重新輸入:\n");
scanf("%s",filename);
}
}

③ 編寫一個加密解密程序實現廣義Caesar密碼，該密碼也稱為加法密碼

#include <stdio.h>
#include <string.h>
#define MAXSIZE 81
int main()
{
char str[MAXSIZE];
int i;
int offset;
int n;
printf("請輸入要加密的字元串："); //最大輸入個數是80個字元
gets(str);
printf("請輸入要偏移量："); //若將a變為b，則偏移量為1，以此類推，偏移量在1-25之間
scanf("%d%*c", &offset);
n = strlen(str);
for (i = 0; i < n; i++)
{
if ('a' <= str[i] && str[i] <= 'z' - offset || 'A' <= str[i] && str[i] <= 'Z' - offset)
str[i] += offset;
else
str[i] += offset - 26;
}
printf("加密後的字元串是：");
puts(str);
return 0;
}

④ 如何用C語言編寫密碼程序

1、用一個字元數組來存密碼
再用一個字元數組接收你的輸入，然後用strcmp
來比較，如果返回0則密碼是正確的
2、常式：

#include"stdio.h"
#include"string.h"
intmain()
{
charmima[100]="YuanShi888";
charinput[100]={0};
printf("請輸入密碼:");
gets(input);
if(strcmp(mima,input)==0)
printf("恭喜你，密碼正確!
");
else
printf("對不起，密碼輸入錯誤!
");

}

⑤ 怎麼用C++編寫加密

如圖

#include
#define滑哪豎STR_LEN5
boolcode(intnum,charstr[]){
if(num>9999||num<1000){
returnfalse;//說好緩殲的四位數！
信大}else{
intdigit[STR_LEN];//從低位到高位暫存num
inti,j;
for(i=0;i<STR_LEN&&num!=0;i++){
digit[i]=num%10;//取個位
num/=10;
}
for(j=0;--i>=0;j++){
str[j]=digit[i]+(13-1+'A');//取個位+131對應『A』
}
str[j]='';//結束符
returntrue;
}
}

intmain()
{
charstr[STR_LEN];
intnum;
boolgo_on;
do{
scanf("%d",&num);
go_on=code(num,str);
if(go_on)
printf("%d= %s ",num,str);
else{
printf("輸入非法,結束！");
break;//輸入非法時跳出循環
}
}while(1);
getchar();
return0;
}

⑥ 用c++編寫一個簡單的文件加密程序

我自己想寫一個加密的方式
還覺得這個挺難的。
如果真的沒有太高的c＋＋這一塊的基礎的話。
真的是沒法做到，因為代碼比較難寫的。
只能求助於那些摸到水深水淺的那些c＋＋大神們。
之後摸著他(她)們的大腿，然後就說把源代碼的思路原形給我！

⑦ 如何做一個加密文件夾的程序

加密文件夾一個軟體就可以實現的。
像文件夾保敬和銷護3000這亮游款軟體就可以
1、下載安裝軟體後
2、打開加密軟體，然棚並後點擊文件夾保護，找到需要保護的文件夾
3、在彈出的密碼輸入窗口中輸入需要加密的密碼，然後點擊確定
這樣就可以了。既簡單，又安全

⑧ c++怎麼編寫程序實現文件加密和解密

#include <iostream>
#define BufLength 100
void Encrypted_Decrypt(char* filepath, char* sec, int seclegth)
{
FILE * file = fopen(filepath, "r+");
if (NULL == file)
{
std::cout << "打開文件出錯" << std::endl;
return;
}
char buffer[BufLength];
char secret[BufLength];
int n = 0;
while ((n = fread(buffer, 1, BufLength, file))> 0)
{
for (int i = 0; i < n; i++)
secret[i] = buffer[i] ^ sec[i % (seclegth + 1)];//加密
fseek(file, -n, SEEK_CUR);//移動字元串頭在文件中的位置
fwrite(secret, 1, n, file);//覆蓋寫入秘文
fseek(file, n, SEEK_CUR);//移動字元串尾在文件中的位置,下次循環讀取下一串
}
fclose(file);
}

int main()
{
std::cout << "輸入密碼:";
char psw[256];
std::cin >> psw;
std::cout << "加密或者解密文件(全路徑如d:/1.txt):";
char filepath[256];
std::cin >> filepath;
Encrypted_Decrypt(filepath, psw, strlen(psw));
return 0;
}

⑨ VB 加密與解密的程序代碼

加密：

PrivateFunction JiaMi(ByVal varPass As String) As String '參數varPass是需要加密的文本內容

Dim varJiaMi As String * 20

Dim varTmp As Double

Dim strJiaMi As String

Dim I

For I = 1 To Len(varPass)

varTmp = AscW(Mid$(varPass, I, 1))

varJiaMi = Str$(((((varTmp * 1.5) / 5.6) * 2.7) * I))

strJiaMi = strJiaMi & varJiaMi

NextI

JiaMi = strJiaMi

EndFunction

解密函數：

PrivateFunction JieMi(ByVal varPass As String) As String '參數varPass是需要解密的密文內容

Dim varReturn As String * 20

Dim varConvert As Double

Dim varFinalPass As String

Dim varKey As Integer

Dim varPasslenth As Long

varPasslenth = Len(varPass)

For I = 1 To varPasslenth / 20

varReturn = Mid(varPass, (I - 1) * 20 + 1, 20)

varConvert = Val(Trim(varReturn))

varConvert = ((((varConvert / 1.5) * 5.6) / 2.7) / I)

varFinalPass = varFinalPass & ChrW(Val(varConvert))

NextI

JieMi = varFinalPass

EndFunction

(9)編寫一個加密的程序擴展閱讀：

注意事項

編寫加密程序，將用戶輸入的一個英文句子加密為加密字元串，然後輸出加密字元串。假設句子長度不超過100個字元。

根據給定的句子加密函數原型SentenceEncoding，編寫函數SentenceEncoding調用給定的字元加密函數CharEncoding完成句子加密。

然後，編寫主程序提示用戶輸入英文句子，然後調用函數SentenceEncoding對句子加密，最後輸出加密後的句子。

字元加密規則為大寫字母和小寫字母均加密為其補碼, 我們定義ASCII碼值相加為』A』+』Z』即155的兩個大寫字母互為補碼，ASCII碼值相加為』a』+』z』即219的兩個小寫字母互為補碼。

空格用@代替,句號以#代替,其它字元用句點代替。

函數原型：

void SentenceEncoding(char *soure,char *code);

功能：對待加密字元串source加密後保存加密字元串到code.

參數：char *soure，指向待加密句子的字元串指針；

char *code 指向加密字元串的字元串指針；

字元加密函數代碼。

⑩ 高分求用C++寫一道完整的加密程序

#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <string.h>

void encrypt(char *in, char *pwd, char *out)
{
FILE *infile, *outfile;
char ch;
int i=0, PwdLen=0;
if ((infile=fopen(in, "rb"))==NULL)
{
printf("無法打開 %s\n"亂姿, in);
getch();
exit(1);
}
if ((outfile=fopen(out, "wb"))==NULL)
{
printf("無法打開或創建 %s\n", out);
getch();
exit(1);
}
while (pwd[PwdLen++]); //這里用來應付密碼為空擾戚的情況
PwdLen--;
ch=fgetc(infile);
while (!feof(infile))
{
fputc(ch^pwd[i>=PwdLen?i=0:i++], outfile);
ch=fgetc(infile);
}
fclose(infile);
fclose(outfile);
}

int main(int argc, char *argv[])
{
char in[256];
char out[256];
char pwd[256];
if (argc!=4)
{
printf("要加／解緩陪陵密的文件路徑和文件名：\n");
gets(in);
printf("密碼：\n");
gets(pwd);
printf("輸出路徑和文件名：\n");
gets(out);
encrypt(in, pwd, out);
printf("\n\n任務完成!\n\n");
getch();
}
else encrypt(argv[1], argv[2], argv[3]);
return 0;