1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
|
/*
* (C) 2015,2016,2018 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include "fuzzers.h"
#include <botan/divide.h>
void fuzz(const uint8_t in[], size_t len)
{
if(len % 2 == 1 || len > 2*4096/8)
return;
const Botan::BigInt x = Botan::BigInt::decode(in, len / 2);
const Botan::BigInt y = Botan::BigInt::decode(in + len / 2, len / 2);
if(y == 0)
return;
Botan::BigInt q, r;
Botan::divide(x, y, q, r);
FUZZER_ASSERT_TRUE(r < y);
Botan::BigInt z = q*y + r;
FUZZER_ASSERT_EQUAL(z, x);
Botan::BigInt ct_q, ct_r;
Botan::ct_divide(x, y, ct_q, ct_r);
FUZZER_ASSERT_EQUAL(q, ct_q);
FUZZER_ASSERT_EQUAL(r, ct_r);
}
|
