1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5// TODO(jww) The original Blink-style header guard for this file conflicts with
6// the header guard in Source/modules/crypto/Crypto.h, so this is a
7// Chromium-style header guard instead. There is now a bug
8// (https://crbug.com/360121) to track a proposal to change all header guards
9// to a similar style. Thus, whenever that is resolved, this header guard
10// should be changed to whatever style is agreed upon.
11#ifndef SOURCE_PLATFORM_CRYPTO_H_
12#define SOURCE_PLATFORM_CRYPTO_H_
13
14#include "platform/PlatformExport.h"
15#include "public/platform/WebCrypto.h"
16#include "wtf/HashSet.h"
17#include "wtf/StringHasher.h"
18#include "wtf/Vector.h"
19
20namespace blink {
21
22static const size_t kMaxDigestSize = 64;
23typedef Vector<uint8_t, kMaxDigestSize> DigestValue;
24
25const size_t sha1HashSize = 20;
26enum HashAlgorithm {
27    HashAlgorithmSha1,
28    HashAlgorithmSha256,
29    HashAlgorithmSha384,
30    HashAlgorithmSha512
31};
32
33PLATFORM_EXPORT bool computeDigest(HashAlgorithm, const char* digestable, size_t length, DigestValue& digestResult);
34PLATFORM_EXPORT PassOwnPtr<WebCryptoDigestor> createDigestor(HashAlgorithm);
35PLATFORM_EXPORT void finishDigestor(WebCryptoDigestor*, DigestValue& digestResult);
36
37} // namespace blink
38
39namespace WTF {
40
41struct DigestValueHash {
42    static unsigned hash(const blink::DigestValue& v)
43    {
44        return StringHasher::computeHash(v.data(), v.size());
45    }
46    static bool equal(const blink::DigestValue& a, const blink::DigestValue& b)
47    {
48        return a == b;
49    };
50    static const bool safeToCompareToEmptyOrDeleted = true;
51};
52template <>
53struct DefaultHash<blink::DigestValue> {
54    typedef DigestValueHash Hash;
55};
56
57template <>
58struct DefaultHash<blink::HashAlgorithm> {
59    typedef IntHash<blink::HashAlgorithm> Hash;
60};
61template <>
62struct HashTraits<blink::HashAlgorithm> : UnsignedWithZeroKeyHashTraits<blink::HashAlgorithm> {
63};
64
65} // namespace WTF
66#endif // SOURCE_PLATFORM_CRYPTO_H_
67