Use size_t as the type of key_length and digest_length arguments of HMAC.

chrome/nacl/nacl_validation_query.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 CHROME_NACL_NACL_VALIDATION_QUERY_H_
 #define CHROME_NACL_NACL_VALIDATION_QUERY_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 20 matching lines @@
 
   // Bytes indicating the "version" of the validator being used.  This is used
   // to implicitly invalidate the cache - changing the version will change the
   // hashes that are produced.
   std::string nacl_version_;
 };
 
 class NaClValidationQuery {
  public:
   // SHA256 digest size.
-  static const int kDigestLength = 32;
+  static const size_t kDigestLength = 32;
 
   NaClValidationQuery(NaClValidationDB* db, const std::string& profile_key);
 
   void AddData(const char* data, size_t length);
   void AddData(const unsigned char* data, size_t length);
   void AddData(const base::StringPiece& data);
 
   int QueryKnownToValidate();
 
   void SetKnownToValidate();
@@ skipping 18 matching lines @@
 
   crypto::HMAC hasher_;
   NaClValidationDB* db_;
 
   // The size of buffer_ is a somewhat arbitrary choice.  It needs to be at
   // at least kDigestLength * 2, but it can be arbitrarily large.  In practice
   // there are 4 calls to AddData (version, architechture, cpu features, and
   // code), so 4 times digest length means the buffer will not need to be
   // compressed as an intermediate step in the expected use cases.
   char buffer_[kDigestLength * 4];
-  int buffer_length_;
+  size_t buffer_length_;
 
   DISALLOW_COPY_AND_ASSIGN(NaClValidationQuery);
 };
 
 // Create a validation cache interface for use by sel_ldr.
 struct NaClValidationCache* CreateValidationCache(
     NaClValidationDB* db, const std::string& profile_key,
     const std::string& nacl_version);
 
 #endif  // CHROME_NACL_NACL_VALIDATION_QUERY_H_