109 lines
2.9 KiB
C++
109 lines
2.9 KiB
C++
/* Copyright 2015, 2016 OpenMarket Ltd
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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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* http://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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*/
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#include <cstddef>
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#include <cstdint>
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#include <cstring>
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#include <iomanip>
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#include <iostream>
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#include <sstream>
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#include <type_traits>
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namespace olm {
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/** Clear the memory held in the buffer */
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void unset(
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void volatile * buffer, std::size_t buffer_length
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);
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/** Clear the memory backing an object */
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template<typename T>
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void unset(T & value) {
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unset(reinterpret_cast<void volatile *>(&value), sizeof(T));
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}
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/** Check if two buffers are equal in constant time. */
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bool is_equal(
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std::uint8_t const * buffer_a,
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std::uint8_t const * buffer_b,
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std::size_t length
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);
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/** Check if two fixed size arrays are equals */
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template<typename T>
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bool array_equal(
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T const & array_a,
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T const & array_b
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) {
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static_assert(
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std::is_array<T>::value
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&& std::is_convertible<T, std::uint8_t *>::value
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&& sizeof(T) > 0,
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"Arguments to array_equal must be std::uint8_t arrays[]."
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);
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return is_equal(array_a, array_b, sizeof(T));
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}
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/** Copy into a fixed size array */
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template<typename T>
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std::uint8_t const * load_array(
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T & destination,
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std::uint8_t const * source
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) {
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static_assert(
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std::is_array<T>::value
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&& std::is_convertible<T, std::uint8_t *>::value
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&& sizeof(T) > 0,
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"The first argument to load_array must be a std::uint8_t array[]."
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);
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std::memcpy(destination, source, sizeof(T));
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return source + sizeof(T);
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}
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/** Copy from a fixed size array */
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template<typename T>
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std::uint8_t * store_array(
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std::uint8_t * destination,
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T const & source
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) {
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static_assert(
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std::is_array<T>::value
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&& std::is_convertible<T, std::uint8_t *>::value
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&& sizeof(T) > 0,
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"The second argument to store_array must be a std::uint8_t array[]."
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);
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std::memcpy(destination, source, sizeof(T));
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return destination + sizeof(T);
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}
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/** convert an array of bytes to a string representation */
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template<typename T>
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std::string bytes_to_string(T start, T end) {
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std::ostringstream ss;
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ss << std::hex << std::setfill('0');
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while (start != end) {
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ss << std::setw(2) << static_cast<int>(*start++);
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if (start != end) {
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ss << ":";
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}
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}
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return ss.str();
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}
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template<typename T>
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std::string bytes_to_string(T start, size_t len) {
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return bytes_to_string(start, start+len);
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}
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} // namespace olm
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