// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include <cstring> // memcpy
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#include <base/stl_util.h>
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#include <base/strings/string_number_conversions.h>
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#include "brillo/secure_blob.h"
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namespace brillo {
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std::string BlobToString(const Blob& blob) {
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return std::string(blob.begin(), blob.end());
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}
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Blob BlobFromString(const std::string& bytes) {
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return Blob(bytes.begin(), bytes.end());
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}
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Blob CombineBlobs(const std::initializer_list<Blob>& blobs) {
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size_t total_size = 0;
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for (const auto& blob : blobs)
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total_size += blob.size();
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Blob concatenation;
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concatenation.reserve(total_size);
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for (const auto& blob : blobs)
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concatenation.insert(concatenation.end(), blob.begin(), blob.end());
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return concatenation;
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}
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SecureBlob::SecureBlob(const Blob& blob)
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: SecureBlob(blob.begin(), blob.end()) {}
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SecureBlob::SecureBlob(const std::string& data)
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: SecureBlob(data.begin(), data.end()) {}
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SecureBlob::~SecureBlob() {
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clear();
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}
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void SecureBlob::resize(size_type count) {
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if (count < size()) {
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SecureMemset(data() + count, 0, capacity() - count);
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}
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Blob::resize(count);
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}
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void SecureBlob::resize(size_type count, const value_type& value) {
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if (count < size()) {
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SecureMemset(data() + count, 0, capacity() - count);
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}
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Blob::resize(count, value);
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}
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void SecureBlob::clear() {
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SecureMemset(data(), 0, capacity());
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Blob::clear();
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}
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std::string SecureBlob::to_string() const {
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return std::string(data(), data() + size());
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}
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SecureBlob SecureBlob::Combine(const SecureBlob& blob1,
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const SecureBlob& blob2) {
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SecureBlob result;
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result.reserve(blob1.size() + blob2.size());
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result.insert(result.end(), blob1.begin(), blob1.end());
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result.insert(result.end(), blob2.begin(), blob2.end());
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return result;
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}
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bool SecureBlob::HexStringToSecureBlob(const std::string& input,
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SecureBlob* output) {
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// TODO(jorgelo,crbug.com/728047): Consider not using an intermediate
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// std::vector here at all.
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std::vector<uint8_t> temp;
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if (!base::HexStringToBytes(input, &temp)) {
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output->clear();
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return false;
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}
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output->assign(temp.begin(), temp.end());
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SecureMemset(temp.data(), 0, temp.capacity());
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return true;
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}
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BRILLO_DISABLE_ASAN void* SecureMemset(void* v, int c, size_t n) {
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volatile uint8_t* p = reinterpret_cast<volatile uint8_t*>(v);
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while (n--)
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*p++ = c;
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return v;
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}
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int SecureMemcmp(const void* s1, const void* s2, size_t n) {
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const uint8_t* us1 = reinterpret_cast<const uint8_t*>(s1);
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const uint8_t* us2 = reinterpret_cast<const uint8_t*>(s2);
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int result = 0;
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if (0 == n)
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return 1;
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/* Code snippet without data-dependent branch due to
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* Nate Lawson (nate@root.org) of Root Labs. */
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while (n--)
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result |= *us1++ ^ *us2++;
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return result != 0;
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}
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} // namespace brillo
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