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      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_
     67