move enable_localaccount.sh, make pam_offline use it

src/platform/pam_offline/username_password.cc

 // Copyright (c) 2009-2010 The Chromium OS 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 "pam_offline/username_password.h"
 
 #include "openssl/sha.h"
 #include "base/logging.h"
 
 #include "chromeos/utility.h"
@@ skipping 34 matching lines @@
                             const int username_length,
                             const char *password,
                             const int password_length) {
   username_ = new char[username_length+1];
   password_ = new char[password_length+1];
   strncpy(username_, username, username_length);
   strncpy(password_, password, password_length);
   username_[username_length] = password_[password_length] = 0;
 }
 
+#ifdef CHROMEOS_PAM_LOCALACCOUNT
+bool UsernamePassword::IsLocalAccount() const {
+  return 0 == strncmp(username_, kLocalAccount, strlen(kLocalAccount));
+}
+#endif
+
 void UsernamePassword::GetFullUsername(char *name_buffer, int length) const {
   strncpy(name_buffer, username_, length);
 }
 
 void UsernamePassword::GetPartialUsername(char *name_buffer, int length) const {
   char *at_ptr = strrchr(username_, '@');
   *at_ptr = '\0';
   strncpy(name_buffer, username_, length);
   *at_ptr = '@';
 }
@@ skipping 35 matching lines @@
   SHA256_Init(&sha_ctx);
   SHA256_Update(&sha_ctx, system_salt_ascii.c_str(),
                 system_salt_ascii.length());
   SHA256_Update(&sha_ctx, password_, strlen(password_));
   SHA256_Final(md_value, &sha_ctx);
 
   return AsciiEncode(Blob(md_value, md_value + SHA256_DIGEST_LENGTH / 2));
 }
 
 }  // namespace pam_offline