Function LLVMFuzzerCustomCrossOver

tests/fuzz/bolt12.h:106–145

A custom cross-over mutator that decodes the bech32 inputs before cross-over * mutating them. Like LLVMFuzzerCustomMutator, this enables more efficient * fuzzing of bolt12 offers, invoice requests, and invoices. */

 * mutating them. Like LLVMFuzzerCustomMutator, this enables more efficient
 * fuzzing of bolt12 offers, invoice requests, and invoices. */
size_t LLVMFuzzerCustomCrossOver(const u8 *data1, size_t size1, const u8 *data2,
				 size_t size2, u8 *out, size_t max_size,
				 unsigned seed)
{
	const u8 *decoded_data1, *decoded_data2;
	size_t decoded_size1, decoded_size2;
	u8 *mutated_data;
	size_t mutated_size;
	char *encoded_data;
	size_t encoded_size;
	const char *fail;

	/* Decode inputs. */
	decoded_data1 = b12_string_to_data(tmpctx, (char *)data1, size1, bech32_hrp,
					   &decoded_size1, &fail);
	if (!decoded_data1)
		return cross_over_fail();
	decoded_data2 = b12_string_to_data(tmpctx, (char *)data2, size2, bech32_hrp,
					   &decoded_size2, &fail);
	if (!decoded_data2)
		return cross_over_fail();

	/* Cross-pollinate inputs. */
	mutated_data = tal_arr(tmpctx, u8, max_size);
	mutated_size = cross_over(decoded_data1, decoded_size1, decoded_data2,
				  decoded_size2, mutated_data, max_size, seed);
	tal_resize(&mutated_data, mutated_size);

	/* Encode the mutated input. */
	encoded_data = to_bech32_charset(tmpctx, bech32_hrp, mutated_data);
	encoded_size = tal_bytelen(encoded_data) - 1; /* Truncate null byte. */

	if (encoded_size > max_size)
		return cross_over_fail();

	memcpy(out, encoded_data, encoded_size);
	clean_tmpctx();

	return encoded_size;
}

void init(int *argc, char ***argv)
{