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Diffstat (limited to 'base/nigori.cc')
| -rw-r--r-- | base/nigori.cc | 221 |
1 files changed, 0 insertions, 221 deletions
diff --git a/base/nigori.cc b/base/nigori.cc deleted file mode 100644 index 753417d..0000000 --- a/base/nigori.cc +++ /dev/null @@ -1,221 +0,0 @@ -// Copyright (c) 2010 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 "base/nigori.h" - -#if defined(OS_WIN) -#include <winsock2.h> // for htonl -#endif - -#include <sstream> -#include <vector> - -#include "base/base64.h" -#include "base/crypto/encryptor.h" -#include "base/hmac.h" -#include "base/logging.h" -#include "base/rand_util.h" -#include "base/string_util.h" - -namespace base { - -// NigoriStream simplifies the concatenation operation of the Nigori protocol. -class NigoriStream { - public: - // Append the big-endian representation of the length of |value| with 32 bits, - // followed by |value| itself to the stream. - NigoriStream& operator<<(const std::string& value) { - uint32 size = htonl(value.size()); - stream_.write((char *) &size, sizeof(uint32)); - stream_ << value; - return *this; - } - - // Append the big-endian representation of the length of |type| with 32 bits, - // followed by the big-endian representation of the value of |type|, with 32 - // bits, to the stream. - NigoriStream& operator<<(const Nigori::Type type) { - uint32 size = htonl(sizeof(uint32)); - stream_.write((char *) &size, sizeof(uint32)); - uint32 value = htonl(type); - stream_.write((char *) &value, sizeof(uint32)); - return *this; - } - - std::string str() { - return stream_.str(); - } - - private: - std::ostringstream stream_; -}; - -// static -const char Nigori::kSaltSalt[] = "saltsalt"; - -Nigori::Nigori(const std::string& hostname) - : hostname_(hostname) { -} - -Nigori::~Nigori() { -} - -bool Nigori::Init(const std::string& username, const std::string& password) { - NigoriStream salt_password; - salt_password << username << hostname_; - - // Suser = PBKDF2(Username || Servername, "saltsalt", Nsalt, 8) - scoped_ptr<SymmetricKey> user_salt(SymmetricKey::DeriveKeyFromPassword( - SymmetricKey::HMAC_SHA1, salt_password.str(), - kSaltSalt, - kSaltIterations, - kSaltKeySize)); - DCHECK(user_salt.get()); - - std::string raw_user_salt; - user_salt->GetRawKey(&raw_user_salt); - - // Kuser = PBKDF2(P, Suser, Nuser, 16) - user_key_.reset(SymmetricKey::DeriveKeyFromPassword(SymmetricKey::AES, - password, raw_user_salt, kUserIterations, kDerivedKeySizeInBits)); - DCHECK(user_key_.get()); - - // Kenc = PBKDF2(P, Suser, Nenc, 16) - encryption_key_.reset(SymmetricKey::DeriveKeyFromPassword(SymmetricKey::AES, - password, raw_user_salt, kEncryptionIterations, kDerivedKeySizeInBits)); - DCHECK(encryption_key_.get()); - - // Kmac = PBKDF2(P, Suser, Nmac, 16) - mac_key_.reset(SymmetricKey::DeriveKeyFromPassword( - SymmetricKey::HMAC_SHA1, password, raw_user_salt, kSigningIterations, - kDerivedKeySizeInBits)); - DCHECK(mac_key_.get()); - - return true; -} - -// Permute[Kenc,Kmac](type || name) -bool Nigori::Permute(Type type, const std::string& name, - std::string* permuted) { - DCHECK_LT(0U, name.size()); - - NigoriStream plaintext; - plaintext << type << name; - - Encryptor encryptor; - if (!encryptor.Init(encryption_key_.get(), Encryptor::CBC, - std::string(kIvSize, 0))) - return false; - - std::string ciphertext; - if (!encryptor.Encrypt(plaintext.str(), &ciphertext)) - return false; - - std::string raw_mac_key; - if (!mac_key_->GetRawKey(&raw_mac_key)) - return false; - - HMAC hmac(HMAC::SHA256); - if (!hmac.Init(raw_mac_key)) - return false; - - std::vector<unsigned char> hash(kHashSize); - if (!hmac.Sign(ciphertext, &hash[0], hash.size())) - return false; - - std::string output; - output.assign(ciphertext); - output.append(hash.begin(), hash.end()); - - return Base64Encode(output, permuted); -} - -std::string GenerateRandomString(size_t size) { - // TODO(albertb): Use a secure random function. - std::string random(size, 0); - for (size_t i = 0; i < size; ++i) - random[i] = RandInt(0, 0xff); - return random; -} - -// Enc[Kenc,Kmac](value) -bool Nigori::Encrypt(const std::string& value, std::string* encrypted) { - DCHECK_LT(0U, value.size()); - - std::string iv = GenerateRandomString(kIvSize); - - Encryptor encryptor; - if (!encryptor.Init(encryption_key_.get(), Encryptor::CBC, iv)) - return false; - - std::string ciphertext; - if (!encryptor.Encrypt(value, &ciphertext)) - return false; - - std::string raw_mac_key; - if (!mac_key_->GetRawKey(&raw_mac_key)) - return false; - - HMAC hmac(HMAC::SHA256); - if (!hmac.Init(raw_mac_key)) - return false; - - std::vector<unsigned char> hash(kHashSize); - if (!hmac.Sign(ciphertext, &hash[0], hash.size())) - return false; - - std::string output; - output.assign(iv); - output.append(ciphertext); - output.append(hash.begin(), hash.end()); - - return Base64Encode(output, encrypted); -} - -bool Nigori::Decrypt(const std::string& encrypted, std::string* value) { - std::string input; - if (!Base64Decode(encrypted, &input)) - return false; - - if (input.size() < kIvSize * 2 + kHashSize) - return false; - - // The input is: - // * iv (16 bytes) - // * ciphertext (multiple of 16 bytes) - // * hash (32 bytes) - std::string iv(input.substr(0, kIvSize)); - std::string ciphertext(input.substr(kIvSize, - input.size() - (kIvSize + kHashSize))); - std::string hash(input.substr(input.size() - kHashSize, kHashSize)); - - std::string raw_mac_key; - if (!mac_key_->GetRawKey(&raw_mac_key)) - return false; - - HMAC hmac(HMAC::SHA256); - if (!hmac.Init(raw_mac_key)) - return false; - - std::vector<unsigned char> expected(kHashSize); - if (!hmac.Sign(ciphertext, &expected[0], expected.size())) - return false; - - if (hash.compare(0, hash.size(), - reinterpret_cast<char *>(&expected[0]), - expected.size())) - return false; - - Encryptor encryptor; - if (!encryptor.Init(encryption_key_.get(), Encryptor::CBC, iv)) - return false; - - std::string plaintext; - if (!encryptor.Decrypt(ciphertext, value)) - return false; - - return true; -} - -} // namespace base |