components: Rename encryptor directory to os_crypt.

components/encryptor/os_crypt_posix.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/encryptor/os_crypt.h"
-
-#include "base/logging.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/strings/utf_string_conversions.h"
-#include "crypto/encryptor.h"
-#include "crypto/symmetric_key.h"
-
-namespace {
-
-// Salt for Symmetric key derivation.
-const char kSalt[] = "saltysalt";
-
-// Key size required for 128 bit AES.
-const size_t kDerivedKeySizeInBits = 128;
-
-// Constant for Symmetic key derivation.
-const size_t kEncryptionIterations = 1;
-
-// Size of initialization vector for AES 128-bit.
-const size_t kIVBlockSizeAES128 = 16;
-
-// Prefix for cypher text returned by obfuscation version.  We prefix the
-// cyphertext with this string so that future data migration can detect
-// this and migrate to full encryption without data loss.
-const char kObfuscationPrefix[] = "v10";
-
-// Generates a newly allocated SymmetricKey object based a hard-coded password.
-// Ownership of the key is passed to the caller.  Returns NULL key if a key
-// generation error occurs.
-crypto::SymmetricKey* GetEncryptionKey() {
-  // We currently "obfuscate" by encrypting and decrypting with hard-coded
-  // password.  We need to improve this password situation by moving a secure
-  // password into a system-level key store.
-  // http://crbug.com/25404 and http://crbug.com/49115
-  std::string password = "peanuts";
-  std::string salt(kSalt);
-
-  // Create an encryption key from our password and salt.
-  scoped_ptr<crypto::SymmetricKey> encryption_key(
-      crypto::SymmetricKey::DeriveKeyFromPassword(crypto::SymmetricKey::AES,
-                                                  password,
-                                                  salt,
-                                                  kEncryptionIterations,
-                                                  kDerivedKeySizeInBits));
-  DCHECK(encryption_key.get());
-
-  return encryption_key.release();
-}
-
-}  // namespace
-
-bool OSCrypt::EncryptString16(const base::string16& plaintext,
-                              std::string* ciphertext) {
-  return EncryptString(base::UTF16ToUTF8(plaintext), ciphertext);
-}
-
-bool OSCrypt::DecryptString16(const std::string& ciphertext,
-                              base::string16* plaintext) {
-  std::string utf8;
-  if (!DecryptString(ciphertext, &utf8))
-    return false;
-
-  *plaintext = base::UTF8ToUTF16(utf8);
-  return true;
-}
-
-bool OSCrypt::EncryptString(const std::string& plaintext,
-                            std::string* ciphertext) {
-  // This currently "obfuscates" by encrypting with hard-coded password.
-  // We need to improve this password situation by moving a secure password
-  // into a system-level key store.
-  // http://crbug.com/25404 and http://crbug.com/49115
-
-  if (plaintext.empty()) {
-    *ciphertext = std::string();
-    return true;
-  }
-
-  scoped_ptr<crypto::SymmetricKey> encryption_key(GetEncryptionKey());
-  if (!encryption_key.get())
-    return false;
-
-  std::string iv(kIVBlockSizeAES128, ' ');
-  crypto::Encryptor encryptor;
-  if (!encryptor.Init(encryption_key.get(), crypto::Encryptor::CBC, iv))
-    return false;
-
-  if (!encryptor.Encrypt(plaintext, ciphertext))
-    return false;
-
-  // Prefix the cypher text with version information.
-  ciphertext->insert(0, kObfuscationPrefix);
-  return true;
-}
-
-bool OSCrypt::DecryptString(const std::string& ciphertext,
-                            std::string* plaintext) {
-  // This currently "obfuscates" by encrypting with hard-coded password.
-  // We need to improve this password situation by moving a secure password
-  // into a system-level key store.
-  // http://crbug.com/25404 and http://crbug.com/49115
-
-  if (ciphertext.empty()) {
-    *plaintext = std::string();
-    return true;
-  }
-
-  // Check that the incoming cyphertext was indeed encrypted with the expected
-  // version.  If the prefix is not found then we'll assume we're dealing with
-  // old data saved as clear text and we'll return it directly.
-  // Credit card numbers are current legacy data, so false match with prefix
-  // won't happen.
-  if (ciphertext.find(kObfuscationPrefix) != 0) {
-    *plaintext = ciphertext;
-    return true;
-  }
-
-  // Strip off the versioning prefix before decrypting.
-  std::string raw_ciphertext = ciphertext.substr(strlen(kObfuscationPrefix));
-
-  scoped_ptr<crypto::SymmetricKey> encryption_key(GetEncryptionKey());
-  if (!encryption_key.get())
-    return false;
-
-  std::string iv(kIVBlockSizeAES128, ' ');
-  crypto::Encryptor encryptor;
-  if (!encryptor.Init(encryption_key.get(), crypto::Encryptor::CBC, iv))
-    return false;
-
-  if (!encryptor.Decrypt(raw_ciphertext, plaintext))
-    return false;
-
-  return true;
-}