110 lines
2.4 KiB
C
110 lines
2.4 KiB
C
#include <why2/encrypter.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <math.h>
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#include <why2/flags.h>
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#include <why2/misc.h>
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outputFlags encryptText(char *text, char *keyNew, inputFlags flags)
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{
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//CHECK FOR ACTIVE VERSION
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if (!flags.skipCheck) checkVersion(flags);
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srand(time(0)); //TRY TO MAKE RANDOM GENERATION REALLY "RANDOM"
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//VARIABLES
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char *key = malloc(getKeyLength());
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char *returningText;
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char *textBuffer;
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int *textKeyChain = malloc(strlen(text) * sizeof(int));
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int numberBuffer = 0;
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if (keyNew != NULL)
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{
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if (strlen(keyNew) < getKeyLength())
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{
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fprintf(stderr, "Key must be at least %d characters long!\n", getKeyLength());
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exit(INVALID_KEY);
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}
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strcpy(key, keyNew);
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//REDEFINE keyLength
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setKeyLength(strlen(key));
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goto skipKey;
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}
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//LOAD KEY
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for (int i = 0; i < getKeyLength(); i++)
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{
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//SET numberBuffer TO RANDOM NUMBER BETWEEN 0 AND 52
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numberBuffer = (rand() % 52) + 1;
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//GET CHAR FROM numberBuffer
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if (numberBuffer > 26)
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{
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numberBuffer += 70;
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} else
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{
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numberBuffer += 64;
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}
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key[i] = (char) numberBuffer;
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}
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skipKey:
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//LOAD textKeyChain
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generateTextKeyChain(key, textKeyChain, strlen(text));
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//ACTUALLY ENCRYPT TEXT
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for (int i = 0; i < strlen(text); i++)
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{
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textKeyChain[i] -= (int) text[i];
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}
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//COUNT REQUIRED SIZE FOR returningText
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for (int i = 0; i < strlen(text); i++)
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{
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numberBuffer += countIntLength(textKeyChain[i]);
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}
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//ALLOCATE returningText (WITH THE SEPARATORS)
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returningText = malloc(numberBuffer + strlen(text) - 1);
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strcpy(returningText, "");
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//LOAD returningText
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for (int i = 0; i < strlen(text); i++)
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{
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textBuffer = malloc(countIntLength(textKeyChain[i]));
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sprintf(textBuffer, "%d", textKeyChain[i]);
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strcat(returningText, textBuffer);
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if (i != strlen(text) - 1)
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{
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strcat(returningText, ENCRYPTION_SEPARATOR_STRING);
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}
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free(textBuffer);
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}
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//LOAD output
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outputFlags output =
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{
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returningText, //ENCRYPTED TEXT
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key //GENERATED/USED KEY
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};
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//DEALLOCATION
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free(key);
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return output;
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}
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