开源项目之NeoCrypt(加密解密)

一个文件加密解密软件的源代码，可以设置很多著名的加密算法进行加密解密。它集强力、安全的算法和简单、易用的界面于一身。它的文件管理界面可以轻易地观看和更改整个系 统的加密设置，也可以加/解密选定的文件，安全地删除文件。它支持多用户使用。如图：

项目需要用到第三方库cryptlib，该库已经放到源码包中。

本程序有一个动态链接库NeoCryptSX与一个主程序Neocrypt组成，NeoCryptSX动态库操作简单，只负责发送调用消息，Neocrypt主程序中封装了Decryptor类负责解码、Encryptor类负责编码，File类负责文件操作、CProgUpdater类负责进度等。

解码部分：

void Decryptor::decrypt(const std::string& name,std::list<std::string>& pwds){char* buf = new char[BUFFER_SIZE];File file(name);// pass file size to listenerif (mListener)mListener->setRange(file.size());// check for passwordif (pwds.size() == 0)throw std::logic_error("No passwords specified!");// create the envelopeCRYPT_ENVELOPE env;if (cryptCreateEnvelope(&env,CRYPT_UNUSED,CRYPT_FORMAT_AUTO))throw std::runtime_error("Failed to create envelope!");cryptSetAttribute(env,CRYPT_ATTRIBUTE_BUFFERSIZE,BUFFER_SIZE);int n;while (!file.eof() && (n = file.read(buf,BUFFER_SIZE-4096)) != 0){int cBytes;int bytesDone = 0;int bytesLeft = n;while (bytesLeft){int status = cryptPushData(env,buf+bytesDone,bytesLeft,&cBytes);if ( status == CRYPT_ENVELOPE_RESOURCE){// add passwords until one is acceptedstd::list<std::string>::iterator it;std::list<std::string>::iterator end = pwds.end();for (it = pwds.begin(); it != end; ++it){// loop through all required attributes and try the password with eachif (cryptSetAttribute(env,CRYPT_ENVINFO_PASSWORD,CRYPT_CURSOR_FIRST) == CRYPT_OK){bool accept = false;do{CRYPT_ATTRIBUTE_TYPE attrib;cryptGetAttribute(env,CRYPT_ENVINFO_PASSWORD,(int*)&attrib);if (attrib == CRYPT_ENVINFO_PASSWORD){if (cryptSetAttributeString(env,CRYPT_ENVINFO_PASSWORD,it->c_str(),it->size()) == CRYPT_OK){accept = true;break;}}}while (cryptSetAttribute(env,CRYPT_ENVINFO_PASSWORD,CRYPT_CURSOR_NEXT) == CRYPT_OK);if (accept)break;}}if (it == end)throw std::runtime_error("None of the passwords are valid for file " + name + " ! Please try another password.");}else if (status != 0){throw std::runtime_error("The given file " + name + " is not a valid encrypted file.");}bytesLeft -= cBytes;bytesDone += cBytes;cryptPopData(env,buf,BUFFER_SIZE,&cBytes);file.write(buf,cBytes);}if (mListener)mListener->increment(n);}// flush remaining datacryptFlushData(env);cryptPopData(env,buf,BUFFER_SIZE,&n);file.write(buf,n);// destroy envelopecryptDestroyEnvelope(env);// close filefile.close();mListener->complete();delete [] buf;}

编码部分：

void Encryptor::encrypt(const std::string& name,std::list<std::string>& password,Algorithm::Type algo){char* buf = new char[BUFFER_SIZE];File file(name);// pass file size to listenerif (mListener)mListener->setRange(file.size());// check for at-least one passwordif (password.size() == 0)throw std::logic_error("No password in password list!");// set algorithm typeif (cryptSetAttribute(CRYPT_UNUSED,CRYPT_OPTION_ENCR_ALGO,algo))throw std::runtime_error("Could not set algorithm type!");// create the envelopeCRYPT_ENVELOPE env;if (cryptCreateEnvelope(&env,CRYPT_UNUSED,CRYPT_FORMAT_CRYPTLIB))throw std::runtime_error("Failed to create envelope!");std::list<std::string>::iterator i;std::list<std::string>::iterator e = password.end();// add password(s)for (i = password.begin(); i != e; ++i){if (cryptSetAttributeString(env,CRYPT_ENVINFO_PASSWORD,(*i).c_str(),(*i).size()))throw std::runtime_error("Failed to set password " + (*i) + "!");}// allocate encryption bufferif (cryptSetAttribute(env,CRYPT_ATTRIBUTE_BUFFERSIZE,BUFFER_SIZE))throw std::runtime_error("Could not allocate encryption buffer!");int n;int cBytes;if (!file.eof() && (n = file.read(buf,100)) != 0){cryptPushData(env,buf,n,&cBytes);cryptPopData(env,buf,BUFFER_SIZE,&cBytes);file.write(buf,cBytes);if (mListener)mListener->increment(n);}while (!file.eof() && (n = file.read(buf,BUFFER_SIZE-4096)) != 0){cryptPushData(env,buf,n,&cBytes);cryptPopData(env,buf,BUFFER_SIZE,&cBytes);file.write(buf,cBytes);if (mListener)mListener->increment(n);}// flush remaining datacryptFlushData(env);cryptPopData(env,buf,BUFFER_SIZE,&cBytes);file.write(buf,cBytes);// destroy envelopecryptDestroyEnvelope(env);// close filefile.close();mListener->complete();delete [] buf;}

学习的目的是成熟！~

源码下载，喜欢的自己研究了，