page-linear.c

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/** Encrypts, then decrypts, 2 MB of memory and verifies that the
   values are as they should be. */
 
#include <string.h>
#include "tests/arc4.h"
#include "tests/lib.h"
#include "tests/main.h"
 
#define SIZE (2 * 1024 * 1024)
 
static char buf[SIZE];
 
void
test_main (void)
{
  struct arc4 arc4;
  size_t i;
 
  /* Initialize to 0x5a. */
  msg ("initialize");
  memset (buf, 0x5a, sizeof buf);
 
  /* Check that it's all 0x5a. */
  msg ("read pass");
  for (i = 0; i < SIZE; i++)
    if (buf[i] != 0x5a)
      fail ("byte %zu != 0x5a", i);
 
  /* Encrypt zeros. */
  msg ("read/modify/write pass one");
  arc4_init (&arc4, "foobar", 6);
  arc4_crypt (&arc4, buf, SIZE);
 
  /* Decrypt back to zeros. */
  msg ("read/modify/write pass two");
  arc4_init (&arc4, "foobar", 6);
  arc4_crypt (&arc4, buf, SIZE);
 
  /* Check that it's all 0x5a. */
  msg ("read pass");
  for (i = 0; i < SIZE; i++)
    if (buf[i] != 0x5a)
      fail ("byte %zu != 0x5a", i);
}