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implemented generateTextKeyChain

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This commit is contained in:
Václav Šmejkal 2022-04-27 18:16:37 +02:00
parent 0a2066e55c
commit 4f50c2b4bb
1 changed files with 9 additions and 29 deletions
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38
src/decrypter.c
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@ -5,6 +5,7 @@
#include <stdlib.h>
#include "../include/flags.h"
#include "../include/misc.h"
char*
decryptText(char *text, char *key)
@ -22,10 +23,9 @@ decryptText(char *text, char *key)
//VARIABLES
char *returningText;
int numberBuffer;
int numberBuffer = 1;
char *textBuffer;
numberBuffer = 1;
int textKeyChainLength;
//GET LENGTH OF returningText AND textKeyChain
for (int i = 0; i < strlen(text); i++)
@ -33,34 +33,14 @@ decryptText(char *text, char *key)
if (text[i] == ENCRYPTION_SEPARATOR) numberBuffer++;
}
//SET LENGTH
//SET LENGTH (numberBuffer)
returningText = malloc(numberBuffer);
int textKeyChain[numberBuffer];
int *textKeyChain = malloc(numberBuffer * sizeof(int));
int encryptedTextKeyChain[numberBuffer];
textKeyChainLength = numberBuffer;
//LOAD textKeyChain
for (int i = 0; i < (sizeof(textKeyChain) / sizeof(int)); i++)
{
numberBuffer = i;
//CHECK, IF numberBuffer ISN'T GREATER THAN KEY_LENGTH AND CUT UNUSED LENGTH
while (numberBuffer >= KEY_LENGTH)
{
numberBuffer -= KEY_LENGTH;
}
//FILL textKeyChain
if ((numberBuffer + 1) % 3 == 0)
{
textKeyChain[i] = key[numberBuffer] * key[numberBuffer + 1];
} else if ((numberBuffer + 1) % 2 == 0)
{
textKeyChain[i] = key[numberBuffer] - key[numberBuffer + 1];
} else
{
textKeyChain[i] = key[numberBuffer] + key[numberBuffer + 1];
}
}
generateTextKeyChain(key, textKeyChain, numberBuffer);
//LOAD encryptedTextKeyChain
for (int i = 0; i < (sizeof(encryptedTextKeyChain) / sizeof(int)); i++)
@ -92,13 +72,13 @@ decryptText(char *text, char *key)
}
//DECRYPT TEXT
for (int i = 0; i < (sizeof(textKeyChain) / sizeof(int)); i++)
for (int i = 0; i < textKeyChainLength; i++)
{
textKeyChain[i] -= encryptedTextKeyChain[i];
}
//LOAD returningText
for (int i = 0; i < sizeof(textKeyChain) / sizeof(int); i++)
for (int i = 0; i < textKeyChainLength; i++)
{
returningText[i] = (char) textKeyChain[i];
}