mirror of
https://github.com/kidfromjupiter/nearby.git
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73 lines
1.9 KiB
C++
73 lines
1.9 KiB
C++
// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "connections/implementation/mediums/utils.h"
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#include <cstddef>
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#include <cstdint>
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#include <string>
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#include "internal/platform/base64_utils.h"
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#include "internal/platform/byte_array.h"
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#include "internal/platform/crypto.h" //NOLINT
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#include "internal/platform/prng.h"
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namespace nearby {
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namespace connections {
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namespace {
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constexpr int kDefaultSaltLength = 16;
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} // namespace
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ByteArray Utils::GenerateRandomBytes(size_t length) {
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Prng prng;
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std::string data;
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data.reserve(length);
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// Adds 4 random bytes per iteration.
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while (length > 0) {
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std::uint32_t val = prng.NextUint32();
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for (int i = 0; i < 4; i++) {
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data += val & 0xFF;
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val >>= 8;
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length--;
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if (!length) break;
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}
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}
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return ByteArray(data);
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}
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ByteArray Utils::Sha256Hash(const ByteArray& source, size_t length) {
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return Utils::Sha256Hash(std::string(source), length);
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}
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ByteArray Utils::Sha256Hash(const std::string& source, size_t length) {
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ByteArray full_hash(length);
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full_hash.CopyAt(0, Crypto::Sha256(source));
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return full_hash;
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}
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// Generates salts.
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std::string Utils::GenerateSalt() { return GenerateSalt(kDefaultSaltLength); }
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std::string Utils::GenerateSalt(size_t length) {
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ByteArray salt = GenerateRandomBytes(length);
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return Base64Utils::Encode(salt);
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}
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} // namespace connections
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} // namespace nearby
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