third_party/WebKit/Source/platform/Crypto.h

   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
  20 namespace blink {
  21
  22 static const size_t kMaxDigestSize = 64;
  23 typedef Vector<uint8_t, kMaxDigestSize> DigestValue;
  24
  25 const size_t sha1HashSize = 20;
  26 enum HashAlgorithm {
  27     HashAlgorithmSha1,
  28     HashAlgorithmSha256,
  29     HashAlgorithmSha384,
  30     HashAlgorithmSha512
  31 };
  32
  33 PLATFORM_EXPORT bool computeDigest(HashAlgorithm, const char* digestable, size_t length, DigestValue& digestResult);
  34 PLATFORM_EXPORT PassOwnPtr<WebCryptoDigestor> createDigestor(HashAlgorithm);
  35 PLATFORM_EXPORT void finishDigestor(WebCryptoDigestor*, DigestValue& digestResult);
  36
  37 } // namespace blink
  38
  39 namespace WTF {
  40
  41 struct 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 };
  52 template <>
  53 struct DefaultHash<blink::DigestValue> {
  54     typedef DigestValueHash Hash;
  55 };
  56
  57 template <>
  58 struct DefaultHash<blink::HashAlgorithm> {
  59     typedef IntHash<blink::HashAlgorithm> Hash;
  60 };
  61 template <>
  62 struct HashTraits<blink::HashAlgorithm> : UnsignedWithZeroKeyHashTraits<blink::HashAlgorithm> {
  63 };
  64
  65 } // namespace WTF
  66 #endif // SOURCE_PLATFORM_CRYPTO_H_