I am trying to use only one library and I encountered a few issues. This program should do the following :
我只尝试使用一个库,但遇到了一些问题。本程序应做到以下几点:
- it should have an encryption function and another one for decryption.
- 它应该有一个加密功能和一个解密功能。
- string must be 8 capped letters or digs (
A-Z 0-9
) - 字符串必须为8个带帽字母或digs (A-Z 0-9)
-
the process should be like this :
这个过程应该是这样的:
-
A : moving the given string 2 characters backwards
before :abcdefg
after :cdefgab
A:将给定的字符串2字符向后移动:abcdefg后:cdefgab
-
B:Reverse the result of A Function.
before :cdefgab
after :bagfedc
B:反转函数的结果。前:cdefgab后:bagfedc
-
C: Swap pairs characters with unpaired characters.
before :ereaeedf
after :reaeeefd
C:交换成对的字符和未配对的字符。之前:ereaeedf after: reaeeefd
-
D: Going through an encryption table.
two arrays[Original]
and[Encrypted]
take the string and divide it to chars each char run through the table and take his original position (A = 1 , B = 2 , C =3 and so on) and going to [Encrypted] array and take the character that is in the same position .通过一个加密表。两个数组(原始)和(加密)识字课每一个字符的字符串,并将其贯穿桌子上,把他的原始位置(A = 1,B = 2,C = 3等等),将(加密)数组和字符是在相同的位置。
array[Original] = {"A","B","C","D","D","F"); array[Encrypted]= {"%","a","h","k","c","^");
before :
FACD
after :^%hk
后:FACD:^ %港元
-
My problem now is with Enc_Table
which doesn't work as expected. I have no idea why. I have tried a few things nothing sorted it out.
我现在的问题是Enc_Table,它不像预期的那样工作。我不知道为什么。我已经尝试了一些东西,但没有办法解决。
My Code Source :
我的代码来源:
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#define charsize 8
bool isStringEncrypted(char[]);
void Encryption();
char* Rotate_R(char str[]);
char* Reverse(char str[]);
char* Swap(char str[]);
char* Enc_Table(char str[]);
int getPos(const char *array, size_t size, char c);
void main() {
int choose = 0;
while (choose != 3){
printf("Menu: \n\n Please choose an option: \n\n 1 - Encrypt \n 2 - Decrypt [Not Implemented Yet] \n 3 - Exit \n\nYour selection ? :");
scanf("%d", &choose);
switch (choose)
{
case 1:
Encryption();
break;
case 2:
//Decryption();
break;
case 3:
break;
default:
printf("Wrong choice, try again!\n");
}
}
}
void Encryption(){
char str[charsize];
char result[charsize];
do {
printf("please enter the string with 8 characters\n =>");
scanf("%s", str);
printf("\n Variable Str Value = %s \n", str);
} while (isStringEncrypted(str) == false);
printf("Swap = %s \n", Swap(str));
printf("Rotate_R = %s \n", Rotate_R(str));
printf("Reverse = %s \n", Reverse(str));
printf("Enc_Table = %s \n", Enc_Table(str));
printf("\nEncrypted String : %s \n", Enc_Table(Reverse(Rotate_R(Swap(str)))));
scanf("%s", result);
}
bool isStringEncrypted(char str[])
{
int i = 0;
int Letters = 0;
int Numbers = 0;
unsigned int len = 0;
while (*(str + len)) len++;
if (len != charsize)
{
printf(" \n %d = len != %d = Size \n", len, charsize);
return false;
}
while (str[i] != NULL && i < charsize) {
if (str[i] >= 'A' && str[i] <= 'Z' || str[i] >= '0' && str[i] <= '9') {
if (str[i] >= 'A' && str[i] <= 'Z')
Letters++;
if (str[i] >= '0' && str[i] <= '9')
Numbers++;
}
i++;
}
if (i == charsize && (Letters >= 2) && (Numbers >= 2))
return true;
else return true;
}
char* Rotate_R(char str[])
{
char x, y;
int i;
x = str[7];
y = str[6];
for (i = 5; i>-1; i--)
{
str[i + 2] = str[i];
}
str[0] = y;
str[1] = x;
return str;
}
char* Swap(char str[])
{
int i;
char Temp;
for (i = 0; i < charsize; i += 2)
{
Temp = str[i];
str[i] = str[i + 1];
str[i + 1] = Temp;
}
return str;
}
char* Reverse(char str[])
{
unsigned int lens = 0;
while (*(str + lens)) lens++;
char temp;
size_t len = lens - 1;
size_t i;
size_t k = len;
for (i = 0; i < len; i++)
{
temp = str[k];
str[k] = str[i];
str[i] = temp;
k--;
if (k == (len / 2))
{
break;
}
}
return str;
}
char* Enc_Table(char str[])
{
int i;
unsigned int lens = 0;
while (*(str + lens)) lens++;
char dec[38] = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '\0' };
char enc[38] = { 'S', '5', 'P', 'W', 'A', 'R', '8', 'Q', 'I', 'V', 'B', '0', 'D', 'Z', '3', 'C', '2', 'H', '4', '1', 'K', '7', 'G', 'Y', '6', 'O', 'J', 'E', 'U', 'N', 'F', '9', 'M', 'L', 'T', 'X', '\0' };
for (i = 0; i < charsize; i++)
{
int index = getPos(dec, sizeof(dec), str[i]);
str[i] = enc[index];
i++;
}
return str;
}
int getPos(const char *array, size_t size, char c)
{
for (size_t i = 0; i < size; i++)
{
if (array[i] == c)
return (int)i;
}
return -1;
}
1 个解决方案
#1
2
Encryption table should work like this:
加密表应该这样工作:
void table(char *str, int forward)
{
const char dec[36] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
const char enc[36] = "S5PWAR8QIVB0DZ3C2H41K7GY6OJEUNF9MLTX";
const char *from = forward ? dec : enc;
const char *to = forward ? enc : dec;
for (int i = 0, len = strlen(str); i < len; i++)
{
for (int n = 0; n < 36; n++)
{
if (str[i] == from[n])
{
str[i] = to[n];
break;
}
}
}
}
int main()
{
char s[100];
strcpy(s, "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789");
table(s, 1);// encryption
printf("%s\n", s);
table(s, 0);// decryption
printf("%s\n", s);
return 0;
}
Also the same function with strcspn:
strcspn也有相同的函数:
void table(char *str, int forward)
{
const char *dec = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
const char *enc = "S5PWAR8QIVB0DZ3C2H41K7GY6OJEUNF9MLTX";
const char *from = forward ? dec : enc;
const char *to = forward ? enc : dec;
char buf[2] = { 0 };
for (int i = 0, len = strlen(str); i < len; i++)
{
buf[0] = str[i];
int pos = strcspn(from, buf);
if (pos < 36)
str[i] = to[pos];
}
}
While we are at it, a fast rotate function:
当我们在它的时候,一个快速旋转函数:
void rotate(char *str, int rotate, int direction /*1=rotate-right, 0=rotate-left*/)
{
int length = strlen(str);
if (!rotate || rotate >= length)
return;
int offset = direction ? (length - rotate) : rotate;
char *left = _strdup(str);
char *right = _strdup(str + offset);
//swap left and right to finish rotate
strcpy(str, right);
strncat(str, left, offset);
free(left);
free(right);
}
#1
2
Encryption table should work like this:
加密表应该这样工作:
void table(char *str, int forward)
{
const char dec[36] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
const char enc[36] = "S5PWAR8QIVB0DZ3C2H41K7GY6OJEUNF9MLTX";
const char *from = forward ? dec : enc;
const char *to = forward ? enc : dec;
for (int i = 0, len = strlen(str); i < len; i++)
{
for (int n = 0; n < 36; n++)
{
if (str[i] == from[n])
{
str[i] = to[n];
break;
}
}
}
}
int main()
{
char s[100];
strcpy(s, "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789");
table(s, 1);// encryption
printf("%s\n", s);
table(s, 0);// decryption
printf("%s\n", s);
return 0;
}
Also the same function with strcspn:
strcspn也有相同的函数:
void table(char *str, int forward)
{
const char *dec = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
const char *enc = "S5PWAR8QIVB0DZ3C2H41K7GY6OJEUNF9MLTX";
const char *from = forward ? dec : enc;
const char *to = forward ? enc : dec;
char buf[2] = { 0 };
for (int i = 0, len = strlen(str); i < len; i++)
{
buf[0] = str[i];
int pos = strcspn(from, buf);
if (pos < 36)
str[i] = to[pos];
}
}
While we are at it, a fast rotate function:
当我们在它的时候,一个快速旋转函数:
void rotate(char *str, int rotate, int direction /*1=rotate-right, 0=rotate-left*/)
{
int length = strlen(str);
if (!rotate || rotate >= length)
return;
int offset = direction ? (length - rotate) : rotate;
char *left = _strdup(str);
char *right = _strdup(str + offset);
//swap left and right to finish rotate
strcpy(str, right);
strncat(str, left, offset);
free(left);
free(right);
}