rootme/challenges/cryptanalyse/clair-connu-xor/decode.py

@@ -1,16 +0,0 @@
-#!/usr/bin/python3
-
-key = "fallen"
-keysz = len(key)
-
-f = open("ch3.bmp", mode="rb")
-data = f.read()
-f.close()
-
-out = bytearray()
-for i in range(len(data)):
-	out.append(data[i] ^ ord(key[(i) % keysz]))
-
-f = open("ch3.out.bmp", mode="wb")
-f.write(out)
-f.close()

rootme/challenges/cryptanalyse/code-pseudo-random-number-generator/random_generator/crypt.c

@@ -1,93 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <time.h>
-
-#define KEY_SIZE 32
-#define BUFF_SIZE 1024
-
-unsigned int holdrand = 0;
-
-static void Srand (unsigned int seed) {
-  holdrand = seed;
-}
-
-static int Rand (void) {
-  return(((holdrand = holdrand * 214013L + 2531011L) >> 16) & 0x7fff);
-}
-
-char* genere_key(void) {
-  int i;
-  static char key[KEY_SIZE+1];
-  const char charset[] = 
-    "abcdefghijklmnopqrstuvwxyz"
-    "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
-    "123456789";
-  
-  for(i = 0; i < KEY_SIZE; i++) {
-    key[i] = charset[Rand() % (sizeof(charset) - 1)];
-  }
-  key[KEY_SIZE] = '\0';
-
-  return key;
-}
-
-void crypt_buffer(unsigned char *buffer, size_t size, char *key) {
-  size_t i;
-  int j;
-
-  j = 0;
-  for(i = 0; i < size; i++) {
-    if(j >= KEY_SIZE)
-      j = 0;
-    buffer[i] ^= key[j];
-    j++;
-  }
-}
-
-void crypt_file(FILE *in, FILE *out) {
-  unsigned char buffer[BUFF_SIZE];
-  char *key;
-  size_t size;
-
-  key = genere_key();
-
-  printf("[+] Using key : %s\n", key);
-
-  do {
-    size = fread(buffer, 1, BUFF_SIZE, in);
-    crypt_buffer(buffer, size, key);
-    fwrite(buffer, 1, size, out);
-
-  }while(size == BUFF_SIZE);  
-}
-
-int main(int argc, char **argv) {
-  char path[128];
-  FILE *in, *out;
-
-  Srand(time(NULL));
-
-  if(argc != 2) {
-    printf("[-] Usage : %s <file>\n", argv[0]);
-    return EXIT_FAILURE;
-  }
-
-  snprintf(path, sizeof(path)-1, "%s.crypt", argv[1]);
-
-  if((in = fopen(argv[1], "r")) == NULL) {
-    perror("[-] fopen (in) ");
-    return EXIT_FAILURE;
-  }
-
-  if((out = fopen(path, "w")) == NULL) {
-    perror("[-] fopen (out) ");
-    return EXIT_FAILURE;
-  }
-
-  crypt_file(in, out);
-
-  printf("[+] File %s crypted !\n", path);
-  printf("[+] DONE.\n");
-  return EXIT_SUCCESS;
-}