94 lines
1.7 KiB
C
94 lines
1.7 KiB
C
#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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#define KEY_SIZE 32
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#define BUFF_SIZE 1024
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unsigned int holdrand = 0;
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static void Srand (unsigned int seed) {
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holdrand = seed;
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}
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static int Rand (void) {
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return(((holdrand = holdrand * 214013L + 2531011L) >> 16) & 0x7fff);
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}
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char* genere_key(void) {
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int i;
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static char key[KEY_SIZE+1];
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const char charset[] =
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"abcdefghijklmnopqrstuvwxyz"
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"123456789";
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for(i = 0; i < KEY_SIZE; i++) {
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key[i] = charset[Rand() % (sizeof(charset) - 1)];
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}
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key[KEY_SIZE] = '\0';
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return key;
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}
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void crypt_buffer(unsigned char *buffer, size_t size, char *key) {
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size_t i;
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int j;
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j = 0;
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for(i = 0; i < size; i++) {
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if(j >= KEY_SIZE)
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j = 0;
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buffer[i] ^= key[j];
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j++;
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}
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}
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void crypt_file(FILE *in, FILE *out) {
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unsigned char buffer[BUFF_SIZE];
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char *key;
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size_t size;
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key = genere_key();
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printf("[+] Using key : %s\n", key);
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do {
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size = fread(buffer, 1, BUFF_SIZE, in);
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crypt_buffer(buffer, size, key);
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fwrite(buffer, 1, size, out);
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}while(size == BUFF_SIZE);
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}
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int main(int argc, char **argv) {
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char path[128];
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FILE *in, *out;
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Srand(time(NULL));
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if(argc != 2) {
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printf("[-] Usage : %s <file>\n", argv[0]);
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return EXIT_FAILURE;
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}
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snprintf(path, sizeof(path)-1, "%s.crypt", argv[1]);
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if((in = fopen(argv[1], "r")) == NULL) {
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perror("[-] fopen (in) ");
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return EXIT_FAILURE;
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}
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if((out = fopen(path, "w")) == NULL) {
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perror("[-] fopen (out) ");
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return EXIT_FAILURE;
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}
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crypt_file(in, out);
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printf("[+] File %s crypted !\n", path);
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printf("[+] DONE.\n");
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return EXIT_SUCCESS;
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}
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