Extensions: Consolidate extension id hashing / searching.

components/crx_file/id_util.cc

 // 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.
 
 #include "components/crx_file/id_util.h"
 
 #include "base/files/file_path.h"
+#include "base/sha1.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "crypto/sha2.h"
 
 namespace {
 
 // Converts a normal hexadecimal string into the alphabet used by extensions.
 // We use the characters 'a'-'p' instead of '0'-'f' to avoid ever having a
 // completely numeric host, since some software interprets that as an IP
 // address.
@@ skipping 28 matching lines @@
 }
 
 std::string GenerateIdForPath(const base::FilePath& path) {
   base::FilePath new_path = MaybeNormalizePath(path);
   std::string path_bytes =
       std::string(reinterpret_cast<const char*>(new_path.value().data()),
                   new_path.value().size() * sizeof(base::FilePath::CharType));
   return GenerateId(path_bytes);
 }
 
+std::string HashedIdInHex(const std::string& id) {
+  const std::string id_hash = base::SHA1HashString(id);
+  DCHECK_EQ(base::kSHA1Length, id_hash.length());
+  return base::HexEncode(id_hash.c_str(), id_hash.length());
+}
+
 base::FilePath MaybeNormalizePath(const base::FilePath& path) {
 #if defined(OS_WIN)
   // Normalize any drive letter to upper-case. We do this for consistency with
   // net_utils::FilePathToFileURL(), which does the same thing, to make string
   // comparisons simpler.
   base::FilePath::StringType path_str = path.value();
   if (path_str.size() >= 2 && path_str[0] >= L'a' && path_str[0] <= L'z' &&
       path_str[1] == L':')
     path_str[0] = towupper(path_str[0]);
 
@@ skipping 13 matching lines @@
   std::string temp = base::StringToLowerASCII(id);
   for (size_t i = 0; i < temp.size(); i++)
     if (temp[i] < 'a' || temp[i] > 'p')
       return false;
 
   return true;
 }
 
 }  // namespace id_util
 }  // namespace crx_file