Add type-safe constructors to net::HashValue

net/base/hash_value.h

 // Copyright (c) 2012 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.
 
 #ifndef NET_BASE_HASH_VALUE_H_
 #define NET_BASE_HASH_VALUE_H_
 
 #include <string.h>
 
 #include <string>
@@ skipping 18 matching lines @@
   unsigned char data[32];
 };
 
 enum HashValueTag {
   HASH_VALUE_SHA1,
   HASH_VALUE_SHA256,
 };
 
 class NET_EXPORT HashValue {
  public:
+  explicit HashValue(const SHA1HashValue& hash);
+  explicit HashValue(const SHA256HashValue& hash);
   explicit HashValue(HashValueTag tag) : tag(tag) {}
   HashValue() : tag(HASH_VALUE_SHA1) {}
 
   // Check for equality of hash values
   // This function may have VARIABLE timing which leaks information
   // about its inputs.  For example it may exit early once a
   // nonequal character is discovered.  Thus, for security reasons
   // this function MUST NOT be used with secret values (such as
   // password hashes, MAC tags, etc.)
   bool Equals(const HashValue& other) const;
@@ skipping 64 matching lines @@
 
 // IsSHA1HashInSortedArray returns true iff |hash| is in |array|, a sorted
 // array of SHA1 hashes.
 bool IsSHA1HashInSortedArray(const SHA1HashValue& hash,
                              const uint8_t* array,
                              size_t array_byte_len);
 
 }  // namespace net
 
 #endif  // NET_BASE_HASH_VALUE_H_