Fix ssl_session_cache_openssl.cc hash function.

net/socket/ssl_session_cache_openssl.cc

 // Copyright 2013 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.
 
 #include "net/socket/ssl_session_cache_openssl.h"
 
 #include <list>
 #include <map>
 
 #include <openssl/rand.h>
@@ skipping 69 matching lines @@
   unsigned id_len;
   size_t hash;
 
  private:
   // Session ID are random strings of bytes. This happens to compute the same
   // value as std::hash<std::string> without the extra string copy. See
   // base/containers/hash_tables.h. Other hashing computations are possible,
   // this one is just simple enough to do the job.
   size_t ComputeHash(const unsigned char* id, unsigned id_len) {
     size_t result = 0;
-    for (unsigned n = 0; n < id_len; ++n)
-      result += 131 * id[n];
+    for (unsigned n = 0; n < id_len; ++n) {
+      result = (result * 131) + id[n];
+    }
     return result;
   }
 };
 
 }  // namespace
 
 }  // namespace net
 
 namespace BASE_HASH_NAMESPACE {
 
@@ skipping 418 matching lines @@
   return impl_->SSLSessionIsInCache(cache_key);
 }
 
 void SSLSessionCacheOpenSSL::MarkSSLSessionAsGood(SSL* ssl) {
   return impl_->MarkSSLSessionAsGood(ssl);
 }
 
 void SSLSessionCacheOpenSSL::Flush() { impl_->Flush(); }
 
 }  // namespace net