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// Copyright (c) 2012 The Chromium 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 "net/base/hash_value.h"
#include <stdlib.h>
#include <algorithm>
#include <ostream>
#include "base/base64.h"
#include "base/check_op.h"
#include "base/notreached.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "crypto/sha2.h"
namespace net {
namespace {
// LessThan comparator for use with std::binary_search() in determining
// whether a SHA-256 HashValue appears within a sorted array of
// SHA256HashValues.
struct SHA256ToHashValueComparator {
bool operator()(const SHA256HashValue& lhs, const HashValue& rhs) const {
DCHECK_EQ(HASH_VALUE_SHA256, rhs.tag());
return memcmp(lhs.data, rhs.data(), rhs.size()) < 0;
}
bool operator()(const HashValue& lhs, const SHA256HashValue& rhs) const {
DCHECK_EQ(HASH_VALUE_SHA256, lhs.tag());
return memcmp(lhs.data(), rhs.data, lhs.size()) < 0;
}
};
} // namespace
HashValue::HashValue(const SHA256HashValue& hash)
: HashValue(HASH_VALUE_SHA256) {
fingerprint.sha256 = hash;
}
bool HashValue::FromString(const base::StringPiece value) {
base::StringPiece base64_str;
if (base::StartsWith(value, "sha256/")) {
tag_ = HASH_VALUE_SHA256;
base64_str = value.substr(7);
} else {
return false;
}
std::string decoded;
if (!base::Base64Decode(base64_str, &decoded) || decoded.size() != size())
return false;
memcpy(data(), decoded.data(), size());
return true;
}
std::string HashValue::ToString() const {
std::string base64_str;
base::Base64Encode(base::StringPiece(reinterpret_cast<const char*>(data()),
size()), &base64_str);
switch (tag_) {
case HASH_VALUE_SHA256:
return std::string("sha256/") + base64_str;
}
NOTREACHED() << "Unknown HashValueTag " << tag_;
return std::string("unknown/" + base64_str);
}
size_t HashValue::size() const {
switch (tag_) {
case HASH_VALUE_SHA256:
return sizeof(fingerprint.sha256.data);
}
NOTREACHED() << "Unknown HashValueTag " << tag_;
// While an invalid tag should not happen, return a non-zero length
// to avoid compiler warnings when the result of size() is
// used with functions like memset.
return sizeof(fingerprint.sha256.data);
}
unsigned char* HashValue::data() {
return const_cast<unsigned char*>(const_cast<const HashValue*>(this)->data());
}
const unsigned char* HashValue::data() const {
switch (tag_) {
case HASH_VALUE_SHA256:
return fingerprint.sha256.data;
}
NOTREACHED() << "Unknown HashValueTag " << tag_;
return nullptr;
}
bool operator==(const HashValue& lhs, const HashValue& rhs) {
if (lhs.tag_ != rhs.tag_)
return false;
switch (lhs.tag_) {
case HASH_VALUE_SHA256:
return lhs.fingerprint.sha256 == rhs.fingerprint.sha256;
}
NOTREACHED();
return false;
}
bool operator!=(const HashValue& lhs, const HashValue& rhs) {
return !(lhs == rhs);
}
bool operator<(const HashValue& lhs, const HashValue& rhs) {
if (lhs.tag_ != rhs.tag_)
return lhs.tag_ < rhs.tag_;
switch (lhs.tag_) {
case HASH_VALUE_SHA256:
return lhs.fingerprint.sha256 < rhs.fingerprint.sha256;
}
NOTREACHED();
return false;
}
bool operator>(const HashValue& lhs, const HashValue& rhs) {
return rhs < lhs;
}
bool operator<=(const HashValue& lhs, const HashValue& rhs) {
return !(lhs > rhs);
}
bool operator>=(const HashValue& lhs, const HashValue& rhs) {
return !(lhs < rhs);
}
bool IsSHA256HashInSortedArray(const HashValue& hash,
base::span<const SHA256HashValue> array) {
return std::binary_search(array.begin(), array.end(), hash,
SHA256ToHashValueComparator());
}
bool IsAnySHA256HashInSortedArray(base::span<const HashValue> hashes,
base::span<const SHA256HashValue> array) {
for (const auto& hash : hashes) {
if (hash.tag() != HASH_VALUE_SHA256)
continue;
if (IsSHA256HashInSortedArray(hash, array))
return true;
}
return false;
}
} // namespace net
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