blob: 1ef950b0cbcb8cd4d5df9623d396cc699489c996 [file] [log] [blame]
// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <cstring> // memcpy
#include <base/stl_util.h>
#include "chromeos/secure_blob.h"
namespace chromeos {
SecureBlob::SecureBlob() : chromeos::Blob() {
}
SecureBlob::SecureBlob(const_iterator begin, const_iterator end)
: chromeos::Blob(begin, end) {
}
SecureBlob::SecureBlob(size_t size) : chromeos::Blob(size) {
}
SecureBlob::SecureBlob(const std::string& from)
: chromeos::Blob(from.length()) {
memcpy(data(), from.c_str(), from.length());
}
SecureBlob::SecureBlob(const uint8_t* from, size_t from_length)
: chromeos::Blob(from_length) {
memcpy(data(), from, from_length);
}
SecureBlob::SecureBlob(const char* from, size_t from_length)
: chromeos::Blob(from_length) {
memcpy(data(), from, from_length);
}
SecureBlob::~SecureBlob() {
chromeos::SecureMemset(&this->front(), 0, this->capacity());
}
void SecureBlob::resize(size_type sz) {
if (sz < size()) {
chromeos::SecureMemset(&this->at(sz), 0, size() - sz);
}
chromeos::Blob::resize(sz);
}
void SecureBlob::resize(size_type sz, const value_type& x) {
if (sz < size()) {
chromeos::SecureMemset(&this->at(sz), 0, size() - sz);
}
chromeos::Blob::resize(sz, x);
}
void SecureBlob::clear_contents() {
chromeos::SecureMemset(this->data(), 0, size());
}
void* SecureBlob::data() {
return chromeos::Blob::data();
}
const void* SecureBlob::const_data() const {
return chromeos::Blob::data();
}
std::string SecureBlob::to_string() const {
auto data_ptr = reinterpret_cast<const char*>(const_data());
return std::string(data_ptr, data_ptr + size());
}
SecureBlob SecureBlob::Combine(const SecureBlob& blob1,
const SecureBlob& blob2) {
SecureBlob result;
result.reserve(blob1.size() + blob2.size());
result.insert(result.end(), blob1.begin(), blob1.end());
result.insert(result.end(), blob2.begin(), blob2.end());
return result;
}
void* SecureMemset(void* v, int c, size_t n) {
volatile uint8_t* p = reinterpret_cast<volatile uint8_t*>(v);
while (n--)
*p++ = c;
return v;
}
int SecureMemcmp(const void* s1, const void* s2, size_t n) {
const uint8_t* us1 = reinterpret_cast<const uint8_t*>(s1);
const uint8_t* us2 = reinterpret_cast<const uint8_t*>(s2);
int result = 0;
if (0 == n)
return 1;
/* Code snippet without data-dependent branch due to
* Nate Lawson (nate@root.org) of Root Labs. */
while (n--)
result |= *us1++ ^ *us2++;
return result != 0;
}
} // namespace chromeos