blob: e827680dd70e0657f9dbc62f26049512874dbae3 (
plain)
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
36
37
|
// Copyright 2023 Huawei Cloud Computing Technology Co., Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef INCLUDED_SRC_UTILS_CPP_VERIFY_HASH_HPP
#define INCLUDED_SRC_UTILS_CPP_VERIFY_HASH_HPP
#include <algorithm>
#include <cctype>
#include <optional>
#include <string>
#include "fmt/core.h"
/// \brief Check if the passed string \p s is a hash.
/// This function is mainly used to check that the hash of a Digest received
/// over the wire is a real hash, to prevent a malicious attack.
/// \returns Nullopt on success, error message on failure.
[[nodiscard]] static inline auto IsAHash(std::string const& s) noexcept
-> std::optional<std::string> {
if (!std::all_of(s.begin(), s.end(), [](unsigned char c) {
return std::isxdigit(c);
})) {
return fmt::format("Invalid hash {}", s);
}
return std::nullopt;
}
#endif
|
