text: /* Child process of page-parallel.
     Encrypts 1 MB of zeros, then decrypts it, and ensures that
     the zeros are back. */
  
  #include <string.h>
  #include "tests/arc4.h"
  #include "tests/lib.h"
  #include "tests/main.h"
  
  #define SIZE (1024 * 1024)
  static char buf[SIZE];
  
  int
  main (int argc, char *argv[])
  {
    const char *key = argv[argc - 1];
    struct arc4 arc4;
    size_t i;
  
    test_name = "child-linear";
  
    /* Encrypt zeros. */
    arc4_init (&arc4, key, strlen (key));
    arc4_crypt (&arc4, buf, SIZE);
  
    /* Decrypt back to zeros. */
    arc4_init (&arc4, key, strlen (key));
    arc4_crypt (&arc4, buf, SIZE);
  
    /* Check that it's all zeros. */
    for (i = 0; i < SIZE; i++)
      if (buf[i] != '\0')
        fail ("byte %zu != 0", i);
  
    return 0x42;
  }
  