Initial patch from Will.

src/platform/cryptohome/username_passhash.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 "cryptohome/username_passhash.h"
-
-#include <openssl/sha.h>
-
-#include "base/logging.h"
-#include "chromeos/utility.h"
-
-namespace cryptohome {
-using namespace chromeos;
-using std::string;
-
-UsernamePasshash::UsernamePasshash(const char *username,
-                                   const int username_length,
-                                   const char *passhash,
-                                   const int passhash_length)
-    : username_(username, username_length),
-      passhash_(passhash, passhash_length) {
-}
-
-void UsernamePasshash::GetFullUsername(char *name_buffer, int length) const {
-  strncpy(name_buffer, username_.c_str(), length);
-}
-
-void UsernamePasshash::GetPartialUsername(char *name_buffer, int length) const {
-  size_t at_index = username_.find('@');
-  string partial = username_.substr(0, at_index);
-  strncpy(name_buffer, partial.c_str(), length);
-}
-
-string UsernamePasshash::GetObfuscatedUsername(const Blob &system_salt) const {
-  CHECK(!username_.empty());
-
-  SHA_CTX ctx;
-  unsigned char md_value[SHA_DIGEST_LENGTH];
-
-  SHA1_Init(&ctx);
-  SHA1_Update(&ctx, &system_salt[0], system_salt.size());
-  SHA1_Update(&ctx, username_.c_str(), username_.length());
-  SHA1_Final(md_value, &ctx);
-
-  Blob md_blob(md_value,
-               md_value + (SHA_DIGEST_LENGTH * sizeof(unsigned char)));
-
-  return AsciiEncode(md_blob);
-}
-
-string UsernamePasshash::GetPasswordWeakHash(const Blob &system_salt) const {
-  return passhash_;
-}
-
-}  // namespace cryptohome