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test_x25519.c
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test_x25519.c
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/**
* @cond internal
* @file test_x25519.c
* @copyright
* Copyright (c) 2016 Cryptography Research, Inc. \n
* Released under the MIT License. See LICENSE.txt for license information.
* @author Mike Hamburg
* @brief Tests for x25519 key exchange and signatures.
*/
#include "x25519.h"
#include "strobe_config.h"
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
static void __attribute__((unused))
randomize(uint8_t foo[X25519_BYTES]) {
unsigned i;
static unsigned int seed = 0x12345678;
for (i=0; i<X25519_BYTES; i++) {
seed += seed*seed | 5;
foo[i] = seed>>24;
}
}
int main(int argc, char **argv) {
(void)argc; (void)argv;
int i;
unsigned char
secret1[X25519_BYTES],
public1[X25519_BYTES],
secret2[X25519_BYTES],
public2[X25519_BYTES],
shared1[X25519_BYTES],
shared2[X25519_BYTES];
for (i=0; i<1000; i++) {
randomize(secret1);
x25519_base(public1,secret1,i%2);
randomize(secret2);
x25519_base(public2,secret2,i%2);
x25519(shared1,secret1,public2,i%2);
x25519(shared2,secret2,public1,i%2);
if (memcmp(shared1,shared2,sizeof(shared1))) {
printf("FAIL shared %d\n",i);
}
}
#if X25519_SUPPORT_SIGN && X25519_SUPPORT_VERIFY
unsigned char
eph_secret[X25519_BYTES],
eph_public[X25519_BYTES],
challenge[X25519_BYTES],
response[X25519_BYTES];
for (i=0; i<1000; i++) {
randomize(secret1);
x25519_base(public1,secret1,0);
randomize(eph_secret);
x25519_base(eph_public,eph_secret,0);
randomize(challenge);
x25519_sign_p2(response,challenge,eph_secret,secret1);
if (0 != x25519_verify_p2(response,challenge,eph_public,public1)) {
printf("FAIL sign %d\n",i);
}
challenge[4] ^= 1;
if (0 == x25519_verify_p2(response,challenge,eph_public,public1)) {
printf("FAIL unsign %d\n",i);
}
}
#endif
unsigned char base[X25519_BYTES] = {9};
unsigned char key[X25519_BYTES] = {9};
unsigned char *b = base, *k = key, *tmp;
for (i=0; i<1000; i++) {
x25519(b,k,b,1);
tmp = b; b = k; k = tmp;
}
for (i=0; i<X25519_BYTES; i++) printf("%02x", k[i]);
printf("\n");
return 0;
}