mirror of https://git.matrix.org/git/olm.git
40 lines
1.1 KiB
C
40 lines
1.1 KiB
C
/* This file can be used to test whether the code handles non-canonical curve
|
|
* points (i.e. points with the 256th bit set) in the same way as the reference
|
|
* implementation. */
|
|
|
|
#include <stdint.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
extern void curve25519_donna(unsigned char *output, const unsigned char *a,
|
|
const unsigned char *b);
|
|
int
|
|
main()
|
|
{
|
|
static const uint8_t point1[32] = {
|
|
0x25,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
|
|
};
|
|
static const uint8_t point2[32] = {
|
|
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
|
|
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
|
|
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
|
|
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
|
|
};
|
|
static const uint8_t scalar[32] = { 1 };
|
|
uint8_t out1[32], out2[32];
|
|
|
|
curve25519_donna(out1, scalar, point1);
|
|
curve25519_donna(out2, scalar, point2);
|
|
|
|
if (0 == memcmp(out1, out2, sizeof(out1))) {
|
|
fprintf(stderr, "Top bit not ignored.\n");
|
|
return 1;
|
|
}
|
|
|
|
fprintf(stderr, "Top bit correctly ignored.\n");
|
|
return 0;
|
|
}
|