gitweb.ps.run Git - matrix_esp_thesis/blob - ext/olm/lib/curve25519-donna/test-noncanon.c

   1 /* This file can be used to test whether the code handles non-canonical curve
   2  * points (i.e. points with the 256th bit set) in the same way as the reference
   3  * implementation. */
   4
   5 #include <stdint.h>
   6 #include <stdio.h>
   7 #include <string.h>
   8
   9 extern void curve25519_donna(unsigned char *output, const unsigned char *a,
  10                              const unsigned char *b);
  11 int
  12 main()
  13 {
  14   static const uint8_t point1[32] = {
  15     0x25,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
  16     0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
  17     0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
  18     0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
  19   };
  20   static const uint8_t point2[32] = {
  21     0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
  22     0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
  23     0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
  24     0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
  25   };
  26   static const uint8_t scalar[32] = { 1 };
  27   uint8_t out1[32], out2[32];
  28
  29   curve25519_donna(out1, scalar, point1);
  30   curve25519_donna(out2, scalar, point2);
  31
  32   if (0 == memcmp(out1, out2, sizeof(out1))) {
  33     fprintf(stderr, "Top bit not ignored.\n");
  34     return 1;
  35   }
  36
  37   fprintf(stderr, "Top bit correctly ignored.\n");
  38   return 0;
  39 }