122 lines
2.7 KiB
C
122 lines
2.7 KiB
C
#include <why2/decrypter.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/time.h>
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#include <why2/flags.h>
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#include <why2/misc.h>
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outputFlags decryptText(char *text, char *keyNew, inputFlags flags)
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{
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//TIME VARIABLES
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struct timeval startTime;
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struct timeval finishTime;
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gettimeofday(&startTime, NULL);
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//CHECK FOR ACTIVE VERSION
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checkVersion(flags);
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//CHECK FOR INVALID text
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checkText(text, flags);
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//CHECK FOR INVALID key
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checkKey(keyNew, flags);
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//REDEFINE keyLength
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setKeyLength(strlen(keyNew));
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//VARIABLES
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char *returningText;
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int numberBuffer = 1;
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char *textBuffer;
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int textKeyChainLength;
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int *textKeyChain;
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char *key = malloc(strlen(keyNew));
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//COPY keyNew TO key
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strcpy(key, keyNew);
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//GET LENGTH OF returningText AND textKeyChain
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for (int i = 0; i < strlen(text); i++)
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{
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if (text[i] == ENCRYPTION_SEPARATOR) numberBuffer++;
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}
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//SET LENGTH (numberBuffer)
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returningText = malloc(numberBuffer);
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textKeyChain = malloc(sizeof(int) * numberBuffer);
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int encryptedTextKeyChain[sizeof(int) * numberBuffer];
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textKeyChainLength = numberBuffer;
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//LOAD textKeyChain
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generateTextKeyChain(key, textKeyChain, numberBuffer);
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//LOAD encryptedTextKeyChain
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for (int i = 0; i < textKeyChainLength; i++)
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{
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numberBuffer = 0;
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//GET LENGTH OF EACH CHARACTER
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for (int j = 0; j < strlen(text); j++)
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{
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if (text[j] == ENCRYPTION_SEPARATOR) break;
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numberBuffer++;
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}
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textBuffer = malloc(numberBuffer);
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//LOAD textBuffer
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for (int j = 0; j < strlen(text); j++)
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{
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textBuffer[j] = text[j];
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if (numberBuffer == j) break;
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}
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encryptedTextKeyChain[i] = atoi(textBuffer);
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text += numberBuffer + 1;
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free(textBuffer);
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}
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//DECRYPT TEXT
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for (int i = 0; i < textKeyChainLength; i++)
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{
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textKeyChain[i] -= encryptedTextKeyChain[i];
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}
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//FIX returningText
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strcpy(returningText, "");
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for (int i = 0; i < textKeyChainLength; i++)
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{
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strcat(returningText, " ");
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}
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//LOAD returningText
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for (int i = 0; i < textKeyChainLength; i++)
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{
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returningText[i] = textKeyChain[i];
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}
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//GET FINISH TIME
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gettimeofday(&finishTime, NULL);
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//LOAD output
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outputFlags output =
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{
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returningText, //DECRYPTED TEXT
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key, //USED KEY
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countUnusedKeySize(returningText, key), // NUMBER OF UNUSED CHARS IN KEY
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compareTimeMicro(startTime, finishTime), // ELAPSED TIME
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SUCCESS //EXIT CODE
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};
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//DEALLOCATION
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free(textKeyChain);
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return output;
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}
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