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116 lines
3.6 KiB
C++
116 lines
3.6 KiB
C++
// Copyright (c) 2012 The Chromium 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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#ifndef NET_BASE_HASH_VALUE_H_
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#define NET_BASE_HASH_VALUE_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include <string>
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#include <vector>
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#include "base/containers/span.h"
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#include "base/strings/string_piece.h"
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#include "build/build_config.h"
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#include "net/base/net_export.h"
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namespace net {
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struct NET_EXPORT SHA256HashValue {
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unsigned char data[32];
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};
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inline bool operator==(const SHA256HashValue& lhs, const SHA256HashValue& rhs) {
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return memcmp(lhs.data, rhs.data, sizeof(lhs.data)) == 0;
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}
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inline bool operator!=(const SHA256HashValue& lhs, const SHA256HashValue& rhs) {
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return memcmp(lhs.data, rhs.data, sizeof(lhs.data)) != 0;
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}
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inline bool operator<(const SHA256HashValue& lhs, const SHA256HashValue& rhs) {
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return memcmp(lhs.data, rhs.data, sizeof(lhs.data)) < 0;
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}
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inline bool operator>(const SHA256HashValue& lhs, const SHA256HashValue& rhs) {
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return memcmp(lhs.data, rhs.data, sizeof(lhs.data)) > 0;
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}
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inline bool operator<=(const SHA256HashValue& lhs, const SHA256HashValue& rhs) {
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return memcmp(lhs.data, rhs.data, sizeof(lhs.data)) <= 0;
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}
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inline bool operator>=(const SHA256HashValue& lhs, const SHA256HashValue& rhs) {
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return memcmp(lhs.data, rhs.data, sizeof(lhs.data)) >= 0;
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}
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enum HashValueTag {
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HASH_VALUE_SHA256,
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};
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class NET_EXPORT HashValue {
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public:
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explicit HashValue(const SHA256HashValue& hash);
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explicit HashValue(HashValueTag tag) : tag_(tag) {}
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HashValue() : tag_(HASH_VALUE_SHA256) {}
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// Serializes/Deserializes hashes in the form of
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// <hash-name>"/"<base64-hash-value>
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// (eg: "sha256/...")
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// This format may be persisted to permanent storage, so
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// care should be taken before changing the serialization.
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//
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// This format is used for:
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// - net_internals display/setting public-key pins
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// - logging public-key pins
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// - serializing public-key pins
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// Deserializes a HashValue from a string. On error, returns
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// false and MAY change the contents of HashValue to contain invalid data.
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bool FromString(const base::StringPiece input);
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// Serializes the HashValue to a string. If an invalid HashValue
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// is supplied (eg: an unknown hash tag), returns "unknown"/<base64>
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std::string ToString() const;
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size_t size() const;
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unsigned char* data();
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const unsigned char* data() const;
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HashValueTag tag() const { return tag_; }
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NET_EXPORT friend bool operator==(const HashValue& lhs, const HashValue& rhs);
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NET_EXPORT friend bool operator!=(const HashValue& lhs, const HashValue& rhs);
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NET_EXPORT friend bool operator<(const HashValue& lhs, const HashValue& rhs);
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NET_EXPORT friend bool operator>(const HashValue& lhs, const HashValue& rhs);
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NET_EXPORT friend bool operator<=(const HashValue& lhs, const HashValue& rhs);
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NET_EXPORT friend bool operator>=(const HashValue& lhs, const HashValue& rhs);
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private:
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HashValueTag tag_;
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union {
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SHA256HashValue sha256;
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} fingerprint;
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};
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typedef std::vector<HashValue> HashValueVector;
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// IsSHA256HashInSortedArray returns true iff |hash| is in |array|, a sorted
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// array of SHA256 hashes.
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bool IsSHA256HashInSortedArray(const HashValue& hash,
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base::span<const SHA256HashValue> array);
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// IsAnySHA256HashInSortedArray returns true iff any value in |hashes| is in
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// |array|, a sorted array of SHA256 hashes.
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bool IsAnySHA256HashInSortedArray(base::span<const HashValue> hashes,
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base::span<const SHA256HashValue> array);
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} // namespace net
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#endif // NET_BASE_HASH_VALUE_H_
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