Get rid of WTF::SHA1.

Source/platform/Crypto.h

+// Copyright 2014 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.
+
+// TODO(jww) The original Blink-style header guard for this file conflicts with
+// the header guard in Source/modules/crypto/Crypto.h, so this is a
+// Chromium-style header guard instead. There is now a bug
+// (https://crbug.com/360121) to track a proposal to change all header guards
+// to a similar style. Thus, whenever that is resolved, this header guard
+// should be changed to whatever style is agreed upon.
+#ifndef SOURCE_PLATFORM_CRYPTO_H_
+#define SOURCE_PLATFORM_CRYPTO_H_
+
+#include "platform/PlatformExport.h"
+#include "public/platform/WebCrypto.h"
+#include "wtf/HashSet.h"
+#include "wtf/StringHasher.h"
+#include "wtf/Vector.h"
+#include "wtf/text/CString.h"
+
+namespace WebCore {
+
+static const size_t kMaxDigestSize = 64;
+typedef Vector<uint8_t, kMaxDigestSize> DigestValue;
+
+const size_t sha1HashSize = 20;
+enum HashAlgorithm {
+    HashAlgorithmSha1,
+    HashAlgorithmSha256,
+    HashAlgorithmSha384,
+    HashAlgorithmSha512
+};
+
+PLATFORM_EXPORT void computeDigest(HashAlgorithm, const char* digestable, size_t length, DigestValue& digestResult);
+PLATFORM_EXPORT PassOwnPtr<blink::WebCryptoDigestor> createDigestor(HashAlgorithm);
+PLATFORM_EXPORT void finishDigestor(blink::WebCryptoDigestor*, DigestValue& digestResult);
+
+} // namespace WebCore
+
+namespace WTF {
+
+struct DigestValueHash {
+    static unsigned hash(const WebCore::DigestValue& v)
+    {
+        return StringHasher::computeHash(v.data(), v.size());
+    }
+    static bool equal(const WebCore::DigestValue& a, const WebCore::DigestValue& b)
+    {
+        return a == b;
+    };
+    static const bool safeToCompareToEmptyOrDeleted = true;
+};
+template <>
+struct DefaultHash<WebCore::DigestValue> {
+    typedef DigestValueHash Hash;
+};
+
+template <>
+struct DefaultHash<WebCore::HashAlgorithm> {
+    typedef IntHash<WebCore::HashAlgorithm> Hash;
+};
+template <>
+struct HashTraits<WebCore::HashAlgorithm> : UnsignedWithZeroKeyHashTraits<WebCore::HashAlgorithm> {
+};
+
+} // namespace WTF
+#endif // SOURCE_PLATFORM_CRYPTO_H_