Source: kmdcodec.h


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/*
   Copyright (C) 2000-2001 Dawit Alemayehu 
   Copyright (C) 2001 Rik Hemsley (rikkus) 

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License (LGPL)
   version 2 as published by the Free Software Foundation.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

   RFC 1321 "MD5 Message-Digest Algorithm" Copyright (C) 1991-1992.
   RSA Data Security, Inc. Created 1991. All rights reserved.

   The KMD5 class is based on a C++ implementation of
   "RSA Data Security, Inc. MD5 Message-Digest Algorithm" by
   Mordechai T. Abzug,	Copyright (c) 1995.  This implementation
   passes the test-suite as defined in RFC 1321.

   The encoding and decoding utilities in KCodecs with the exception of
   quoted-printable are based on the java implementation in HTTPClient
   package by Ronald Tschalär Copyright (C) 1996-1999.

   The quoted-printable codec as described in RFC 2045, section 6.7. is by
   Rik Hemsley (C) 2001.
*/

#ifndef _KMDBASE_H
#define _KMDBASE_H

#define KBase64 KCodecs

#include 
#include 
#include 

/**
 * A wrapper class for the most commonly used encoding and
 * decoding algorithms.  Currently there is support for encoding
 * and decoding input using base64, uu and the quoted-printable
 * specifications.
 *
 * @sect Usage:
 *
 * 
 * QCString input = "Aladdin:open sesame";
 * QCString result = KCodecs::base64Encode(input);
 * cout << "Result: " << result.data() << endl;
 *
 * Output should be
 * Result: QWxhZGRpbjpvcGVuIHNlc2FtZQ==
 * 
* * The above example makes use of the convenience functions * (ones that accept/return null-terminated strings) to encode/decode * a string. If what you need is to encode or decode binary data, then * it is highly recommended that you use the functions that take an input * and output QByteArray as arguments. These functions are specifically * tailored for encoding and decoding binary data. * * @short A collection of commonly used encoding and decoding algorithms. * @author Dawit Alemayehu * @author Rik Hemsley */ class KCodecs { public: /** * Encodes the given data using the quoted-printable algorithm. * * @param in data to be encoded. * @param useCRLF if true the input data is expected to have * CRLF line breaks and the output will have CRLF line * breaks, too. * @return quoted-printable encoded data. */ static QCString quotedPrintableEncode(const QByteArray & in, bool useCRLF = true); /** * @overload * * Same as above except it accepts a null terminated * string instead an array. * * @param str data to be encoded. * @param useCRLF if true the input data is expected to have * CRLF line breaks and the output will have CRLF line * breaks, too. * @return quoted-printable encoded data. */ static QCString quotedPrintableEncode(const QCString & str, bool useCRLF = true); /** * Encodes the given data using the quoted-printable algorithm. * * Use this function if you want the result of the encoding * to be placed in another array which cuts down the number * of copy operation that have to be performed in the process. * This is also the preferred method for encoding binary data. * * NOTE: the output array is first reset and then resized * appropriately before use, hence, all data stored in the * output array will be lost. * * @param in data to be encoded. * @param out decoded data. * @param useCRLF if true the input data is expected to have * CRLF line breaks and the output will have CRLF line * breaks, too. * @return quoted-printable encoded data. */ static void quotedPrintableEncode(const QByteArray & in, QByteArray& out, bool useCRLF); /** * Decodes a quoted-printable encoded string. * * Accepts data with CRLF or standard unix line breaks. * * @param in the data to be decoded. * @return decoded data. */ static QCString quotedPrintableDecode(const QByteArray & in); /** * @overload * * Same as above except it accepts a null terminated * string instead an array. * * @param str the data to be decoded. * @return decoded data. */ static QCString quotedPrintableDecode(const QCString & str); /** * Decodes a quoted-printable encoded data. * * Accepts data with CRLF or standard unix line breaks. * Use this function if you want the result of the decoding * to be placed in another array which cuts down the number * of copy operation that have to be performed in the process. * This is also the preferred method for decoding an encoded * binary data. * * NOTE: the output array is first reset and then resized * appropriately before use, hence, all data stored in the * output array will be lost. * * @param in data to be encoded. * @param out decoded data. * * @return quoted-printable encoded data. */ static void quotedPrintableDecode(const QByteArray & in, QByteArray& out); /** * Encodes the given data using the uuencode algorithm. * * The output is split into lines starting with the number of * encoded octets in the line and ending with a newline. No * line is longer than 45 octets (60 characters), excluding the * line terminator. * * @param in the data to be uuencoded * @return a uuencoded data. */ static QCString uuencode( const QByteArray& in ); /** * @overload * * Same as the above functions except it accepts * a null terminated string instead an array. * * @param str the string to be uuencoded. * @return the encoded string. */ static QCString uuencode( const QCString& str ); /** * Encodes the given data using the uuencode algorithm. * * Use this function if you want the result of the encoding * to be placed in another array and cut down the number of * copy operation that have to be performed in the process. * This is the preffered method for encoding binary data. * * NOTE: the output array is first reset and then resized * appropriately before use, hence, all data stored in the * output array will be lost. * * @param in the data to be uuencoded. * @param out the container for the uudecoded data. */ static void uuencode( const QByteArray& in, QByteArray& out ); /** * Decodes the given data using the uuencode algorithm. * * Any 'begin' and 'end' lines like those generated by * the utilities in unix and unix-like OS will be * automatically ignored. * * @param in the data uuencoded data to be decoded. * @return a decoded string. */ static QCString uudecode( const QByteArray& in ); /** * @overload * * Same as the above functions except it accepts * a null terminated string instead an array. * * @param str the string to be decoded. * @return a uudecoded string. */ static QCString uudecode( const QCString& str ); /** * Decodes the given data using the uudecode algorithm. * * Use this function if you want the result of the decoding * to be placed in another array which cuts down the number * of copy operation that have to be performed in the process. * This is the preferred method for decoding binary data. * * Any 'begin' and 'end' lines like those generated by * the utilities in unix and unix-like OS will be * automatically ignored. * * NOTE: the output array is first reset and then resized * appropriately before use, hence, all data stored in the * output array will be lost. * * @param in the uuencoded-data to be decoded. * @param out the container for the uudecoded data. */ static void uudecode( const QByteArray& in, QByteArray& out ); /** * Encodes the given data using the base64 algorithm. * * The boolean argument determines if the encoded data is * going to be restricted to 76 characters or less per line * as specified by RFC 2045. If @p insertLFs is true, then * there will be 76 characters or less per line. * * @param in the data to be encoded. * @param insertLFs limit the number of characters per line. * * @return a base64 encoded string. */ static QCString base64Encode( const QByteArray& in, bool insertLFs = false); /** * @overload * * Same as the above functions except it accepts * a null terminated string instead an array. * * @param str the string to be encoded. * @param insertLFs limit the number of characters per line. * @return the decoded string. */ static QCString base64Encode( const QCString& str, bool insertLFs = false ); /** * Encodes the given data using the base64 algorithm. * * Use this function if you want the result of the encoding * to be placed in another array which cuts down the number * of copy operation that have to be performed in the process. * This is also the preferred method for encoding binary data. * * The boolean argument determines if the encoded data is going * to be restricted to 76 characters or less per line as specified * by RFC 2045. If @p insertLFs is true, then there will be 76 * characters or less per line. * * NOTE: the output array is first reset and then resized * appropriately before use, hence, all data stored in the * output array will be lost. * * @param in the data to be encoded using base64. * @param out the container for the encoded data. * @param insertLFs limit the number of characters per line. */ static void base64Encode( const QByteArray& in, QByteArray& out, bool insertLFs = false ); /** * Decodes the given data that was encoded using the * base64 algorithm. * * @param in the base64-encoded data to be decoded. * @return the decoded data. */ static QCString base64Decode( const QByteArray& in ); /** * @overload * * Same as the above functions except it accepts * a null terminated string instead an array. * * @param str the base64-encoded string. * @return the decoded string. */ static QCString base64Decode( const QCString& str ); /** * Decodes the given data that was encoded with the base64 * algorithm. * * Use this function if you want the result of the decoding * to be placed in another array which cuts down the number * of copy operation that have to be performed in the process. * This is also the preferred method for decoding an encoded * binary data. * * NOTE: the output array is first reset and then resized * appropriately before use, hence, all data stored in the * output array will be lost. * * @param in the encoded data to be decoded. * @param out the container for the decoded data. */ static void base64Decode( const QByteArray& in, QByteArray& out ); private: KCodecs(); private: static const char UUEncMap[64]; static const char UUDecMap[128]; static const char Base64EncMap[64]; static const char Base64DecMap[128]; static const char hexChars[16]; static const unsigned int maxQPLineLength; }; class KMD5Private; /** * Provides an easy to use C++ implementation of RSA's * MD5 algorithm. * * The default constructor is designed to provide much the same * functionality as the most commonly used C-implementation, while * the other three constructors are meant to further simplify the * process of obtaining a digest by calculating the result in a * single step. * * KMD5 is state-based, that means you can add new contents with * update() as long as you didn't request the digest value yet. * After the digest value was requested, the object is "finalized" * and you have to call reset() to be able to do another calculation * with it. The reason for this behaviour is that upon requesting * the message digest KMD5 has to pad the received contents up to a * 64 byte boundary to calculate its value. After this operation it * is not possible to resume consuming data. * * @sect Usage: * * A common usage of this class: * *
 *  const char* test1;
 *  KMD5::Digest rawResult;
 *
 *  test1 = "This is a simple test.";
 *  KMD5 context (test1);
 *  cout << "Hex Digest output: " << context.hexDigest().data() << endl;
 * 
* * To cut down on the unnecessary overhead of creating multiple KMD5 * objects, you can simply invoke @ref reset() to reuse the same object * in making another calculation: * *
 *  context.reset ();
 *  context.update ("TWO");
 *  context.update ("THREE");
 *  cout << "Hex Digest output: " << context.hexDigest().data() << endl;
 * 
* * @short An adapted C++ implementation of RSA Data Securities MD5 algorithm. * @author Dirk Mueller , Dawit Alemayehu */ class KMD5 { public: typedef unsigned char Digest[16]; KMD5(); /** * Constructor that updates the digest for the given string. * * @param in C string or binary data * @param len if negative, calculates the length by using * strlen on the first parameter, otherwise * it trusts the given length (does not stop on NUL byte). */ KMD5(const char* in, int len = -1); /** * @overload * * Same as above except it accepts a QByteArray as its argument. */ KMD5(const QByteArray& a ); /** * @overload * * Same as above except it accepts a QByteArray as its argument. */ KMD5(const QCString& a ); /** * Updates the message to be digested. Be sure to add all data * before you read the digest. After reading the digest, you * can not add more data! * * @param in message to be added to digest * @param len the length of the given message. */ void update(const char* in, int len = -1) { update(reinterpret_cast(in), len); } /** * @overload */ void update(const unsigned char* in, int len = -1); /** * @overload * * @param in message to be added to the digest (QByteArray). */ void update(const QByteArray& in ); /** * @overload * * @param in message to be added to the digest (QByteArray). */ void update(const QCString& in ); /** * @overload * * reads the data from an I/O device, i.e. from a file (QFile). * * NOTE that the file must be open for reading. * * @param file a pointer to FILE as returned by calls like f{d,re}open * * @returns false if an error occured during reading. */ bool update(QIODevice& file); /** * Calling this function will reset the calculated message digest. * Use this method to perform another message digest calculation * without recreating the KMD5 object. */ void reset(); /** * @return the raw representation of the digest */ const Digest& rawDigest (); /** * Fills the given array with the binary representation of the * message digest. * * Use this method if you do not want to worry about making * copy of the digest once you obtain it. * * @param bin an array of 16 characters ( char[16] ) */ void rawDigest( KMD5::Digest& bin ); /** * Returns the value of the calculated message digest in * a hexadecimal representation. */ QCString hexDigest (); /** * @overload */ void hexDigest(QCString&); /** * Returns the value of the calculated message digest in * a base64-encoded representation. */ QCString base64Digest (); /** * returns true if the calculated digest for the given * message matches the given one. */ bool verify( const KMD5::Digest& digest); /** * @overload */ bool verify(const QCString&); protected: /** * Performs the real update work. Note * that length is implied to be 64. */ void transform( const unsigned char buffer[64] ); /** * finalizes the digest */ void finalize(); private: KMD5(const KMD5& u); KMD5& operator=(const KMD5& md); void init(); void encode( unsigned char* output, Q_UINT32 *in, Q_UINT32 len ); void decode( Q_UINT32 *output, const unsigned char* in, Q_UINT32 len ); Q_UINT32 rotate_left( Q_UINT32 x, Q_UINT32 n ); Q_UINT32 F( Q_UINT32 x, Q_UINT32 y, Q_UINT32 z ); Q_UINT32 G( Q_UINT32 x, Q_UINT32 y, Q_UINT32 z ); Q_UINT32 H( Q_UINT32 x, Q_UINT32 y, Q_UINT32 z ); Q_UINT32 I( Q_UINT32 x, Q_UINT32 y, Q_UINT32 z ); void FF( Q_UINT32& a, Q_UINT32 b, Q_UINT32 c, Q_UINT32 d, Q_UINT32 x, Q_UINT32 s, Q_UINT32 ac ); void GG( Q_UINT32& a, Q_UINT32 b, Q_UINT32 c, Q_UINT32 d, Q_UINT32 x, Q_UINT32 s, Q_UINT32 ac ); void HH( Q_UINT32& a, Q_UINT32 b, Q_UINT32 c, Q_UINT32 d, Q_UINT32 x, Q_UINT32 s, Q_UINT32 ac ); void II( Q_UINT32& a, Q_UINT32 b, Q_UINT32 c, Q_UINT32 d, Q_UINT32 x, Q_UINT32 s, Q_UINT32 ac ); private: Q_UINT32 m_state[4]; Q_UINT32 m_count[2]; Q_UINT8 m_buffer[64]; Digest m_digest; bool m_finalized; KMD5Private* d; }; #endif

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