147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org/* 247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org * Copyright 2004 The WebRTC Project Authors. All rights reserved. 347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org * 447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org * Use of this source code is governed by a BSD-style license 547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org * that can be found in the LICENSE file in the root of the source 647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org * tree. An additional intellectual property rights grant can be found 747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org * in the file PATENTS. All contributing project authors may 847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org * be found in the AUTHORS file in the root of the source tree. 947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org */ 1047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 1147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org#ifndef _WEBRTC_BASE_CRYPTSTRING_H_ 1247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org#define _WEBRTC_BASE_CRYPTSTRING_H_ 1347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 1447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org#include <string.h> 1547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 1647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org#include <string> 1747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org#include <vector> 1847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 1947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org#include "webrtc/base/linked_ptr.h" 2047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org#include "webrtc/base/scoped_ptr.h" 2147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 2247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.orgnamespace rtc { 2347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 2447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.orgclass CryptStringImpl { 2547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.orgpublic: 2647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org virtual ~CryptStringImpl() {} 2747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org virtual size_t GetLength() const = 0; 2847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org virtual void CopyTo(char * dest, bool nullterminate) const = 0; 2947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org virtual std::string UrlEncode() const = 0; 3047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org virtual CryptStringImpl * Copy() const = 0; 3147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org virtual void CopyRawTo(std::vector<unsigned char> * dest) const = 0; 3247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org}; 3347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 3447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.orgclass EmptyCryptStringImpl : public CryptStringImpl { 3547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.orgpublic: 3647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org virtual ~EmptyCryptStringImpl() {} 3747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org virtual size_t GetLength() const { return 0; } 3847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org virtual void CopyTo(char * dest, bool nullterminate) const { 3947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org if (nullterminate) { 4047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org *dest = '\0'; 4147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org } 4247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org } 4347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org virtual std::string UrlEncode() const { return ""; } 4447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org virtual CryptStringImpl * Copy() const { return new EmptyCryptStringImpl(); } 4547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org virtual void CopyRawTo(std::vector<unsigned char> * dest) const { 4647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org dest->clear(); 4747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org } 4847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org}; 4947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 5047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.orgclass CryptString { 5147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.orgpublic: 5247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org CryptString() : impl_(new EmptyCryptStringImpl()) {} 5347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org size_t GetLength() const { return impl_->GetLength(); } 5447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org void CopyTo(char * dest, bool nullterminate) const { impl_->CopyTo(dest, nullterminate); } 5547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org CryptString(const CryptString & other) : impl_(other.impl_->Copy()) {} 5647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org explicit CryptString(const CryptStringImpl & impl) : impl_(impl.Copy()) {} 5747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org CryptString & operator=(const CryptString & other) { 5847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org if (this != &other) { 5947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org impl_.reset(other.impl_->Copy()); 6047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org } 6147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org return *this; 6247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org } 6347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org void Clear() { impl_.reset(new EmptyCryptStringImpl()); } 6447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org std::string UrlEncode() const { return impl_->UrlEncode(); } 6547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org void CopyRawTo(std::vector<unsigned char> * dest) const { 6647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org return impl_->CopyRawTo(dest); 6747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org } 6847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 6947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.orgprivate: 7047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org scoped_ptr<const CryptStringImpl> impl_; 7147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org}; 7247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 7347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 7447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// Used for constructing strings where a password is involved and we 7547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// need to ensure that we zero memory afterwards 7647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.orgclass FormatCryptString { 7747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.orgpublic: 7847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org FormatCryptString() { 7947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org storage_ = new char[32]; 8047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org capacity_ = 32; 8147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org length_ = 0; 8247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org storage_[0] = 0; 8347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org } 8447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 8547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org void Append(const std::string & text) { 8647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org Append(text.data(), text.length()); 8747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org } 8847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 8947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org void Append(const char * data, size_t length) { 9047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org EnsureStorage(length_ + length + 1); 9147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org memcpy(storage_ + length_, data, length); 9247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org length_ += length; 9347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org storage_[length_] = '\0'; 9447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org } 9547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 9647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org void Append(const CryptString * password) { 9747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org size_t len = password->GetLength(); 9847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org EnsureStorage(length_ + len + 1); 9947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org password->CopyTo(storage_ + length_, true); 10047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org length_ += len; 10147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org } 10247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 10347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org size_t GetLength() { 10447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org return length_; 10547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org } 10647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 10747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org const char * GetData() { 10847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org return storage_; 10947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org } 11047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 11147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 11247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org // Ensures storage of at least n bytes 11347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org void EnsureStorage(size_t n) { 11447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org if (capacity_ >= n) { 11547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org return; 11647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org } 11747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 11847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org size_t old_capacity = capacity_; 11947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org char * old_storage = storage_; 12047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 12147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org for (;;) { 12247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org capacity_ *= 2; 12347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org if (capacity_ >= n) 12447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org break; 12547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org } 12647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 12747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org storage_ = new char[capacity_]; 12847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 12947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org if (old_capacity) { 13047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org memcpy(storage_, old_storage, length_); 13147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 13247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org // zero memory in a way that an optimizer won't optimize it out 13347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org old_storage[0] = 0; 13447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org for (size_t i = 1; i < old_capacity; i++) { 13547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org old_storage[i] = old_storage[i - 1]; 13647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org } 13747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org delete[] old_storage; 13847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org } 13947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org } 14047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 14147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org ~FormatCryptString() { 14247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org if (capacity_) { 14347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org storage_[0] = 0; 14447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org for (size_t i = 1; i < capacity_; i++) { 14547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org storage_[i] = storage_[i - 1]; 14647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org } 14747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org } 14847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org delete[] storage_; 14947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org } 15047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.orgprivate: 15147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org char * storage_; 15247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org size_t capacity_; 15347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org size_t length_; 15447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org}; 15547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 15647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.orgclass InsecureCryptStringImpl : public CryptStringImpl { 15747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org public: 15847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org std::string& password() { return password_; } 15947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org const std::string& password() const { return password_; } 16047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 16147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org virtual ~InsecureCryptStringImpl() {} 16247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org virtual size_t GetLength() const { return password_.size(); } 16347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org virtual void CopyTo(char * dest, bool nullterminate) const { 16447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org memcpy(dest, password_.data(), password_.size()); 16547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org if (nullterminate) dest[password_.size()] = 0; 16647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org } 16747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org virtual std::string UrlEncode() const { return password_; } 16847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org virtual CryptStringImpl * Copy() const { 16947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org InsecureCryptStringImpl * copy = new InsecureCryptStringImpl; 17047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org copy->password() = password_; 17147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org return copy; 17247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org } 17347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org virtual void CopyRawTo(std::vector<unsigned char> * dest) const { 17447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org dest->resize(password_.size()); 17547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org memcpy(&dest->front(), password_.data(), password_.size()); 17647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org } 17747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org private: 17847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org std::string password_; 17947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org}; 18047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 18147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org} 18247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 18347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org#endif // _WEBRTC_BASE_CRYPTSTRING_H_ 184