22740733591

Committed 05 Mar 2026 10:56PM UTC coverage: 90.267% (-1.6%) from 91.906%

Build # 22740733591

Build Type

Pull #5415

github

Committed by

web-flow

Commit Message

Merge d7d916585 into b47e9d96d

Pull Request Pull Request #5415: Fix input split bug in gcd fuzzer

Run Details

103616 of 114788 relevant lines covered (90.27%)

11561964.13 hits per line

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95.0

/src/fuzzer/gcd.cpp

/*
* (C) 2021 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include "fuzzers.h"

#include <botan/numthry.h>

namespace {

Botan::BigInt ref_gcd(Botan::BigInt a, Botan::BigInt b) {
   Botan::BigInt t;
   while(b != 0) {
      t = a % b;
      t.swap(b);
      t.swap(a);
   }
   return a;
}

}  // namespace

void fuzz(std::span<const uint8_t> in) {
   static const size_t max_bits = 4096;

   if(2 * in.size() * 8 > max_bits) {
      return;
   }

   const size_t half = in.size() / 2;
   const Botan::BigInt x = Botan::BigInt::from_bytes(in.subspan(0, half));
   const Botan::BigInt y = Botan::BigInt::from_bytes(in.subspan(half, in.size() - half));

   const Botan::BigInt ref = ref_gcd(x, y);
   const Botan::BigInt lib = Botan::gcd(x, y);

   if(ref != lib) {
      FUZZER_WRITE_AND_CRASH("X = " << x.to_hex_string() << "\n"
                                    << "Y = " << y.to_hex_string() << "\n"
                                    << "L = " << lib.to_hex_string() << "\n"
                                    << "R = " << ref.to_hex_string() << "\n");
   }
}

1	/*
2	* (C) 2021 Jack Lloyd
3	*
4	* Botan is released under the Simplified BSD License (see license.txt)
5	*/
6
7	#include "fuzzers.h"
8
9	#include <botan/numthry.h>
10
11	namespace {
12
13	Botan::BigInt ref_gcd(Botan::BigInt a, Botan::BigInt b) {	257✔
14	Botan::BigInt t;	257✔
15	while(b != 0) {	77,290✔
16	t = a % b;	77,033✔
17	t.swap(b);	77,033✔
18	t.swap(a);	77,033✔
19	}
20	return a;	257✔
21	}	257✔
22
23	} // namespace
24
25	void fuzz(std::span<const uint8_t> in) {	1,000✔
26	static const size_t max_bits = 4096;	1,000✔
27
28	if(2 * in.size() * 8 > max_bits) {	1,000✔
29	return;	743✔
30	}
31
32	const size_t half = in.size() / 2;	257✔
33	const Botan::BigInt x = Botan::BigInt::from_bytes(in.subspan(0, half));	257✔
34	const Botan::BigInt y = Botan::BigInt::from_bytes(in.subspan(half, in.size() - half));	257✔
35
36	const Botan::BigInt ref = ref_gcd(x, y);	257✔
37	const Botan::BigInt lib = Botan::gcd(x, y);	257✔
38
39	if(ref != lib) {	257✔
40	FUZZER_WRITE_AND_CRASH("X = " << x.to_hex_string() << "\n"	×
41	<< "Y = " << y.to_hex_string() << "\n"
42	<< "L = " << lib.to_hex_string() << "\n"
43	<< "R = " << ref.to_hex_string() << "\n");
44	}
45	}	257✔

randombit / botan / 22740733591

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