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+/*
+   Copyright (C) 2000-2001 Dawit Alemayehu <adawit@kde.org>
+   Copyright (C) 2001 Rik Hemsley (rikkus) <rik@kde.org>
+
+   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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, 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 <qglobal.h>
+#include <qstring.h>
+#include <qiodevice.h>
+
+/**
+ * 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:
+ *
+ * <PRE>
+ * QCString input = "Aladdin:open sesame";
+ * QCString result = KCodecs::base64Encode(input);
+ * cout << "Result: " << result.data() << endl;
+ *
+ * Output should be
+ * Result: QWxhZGRpbjpvcGVuIHNlc2FtZQ==
+ * </PRE>
+ *
+ * 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 <adawit@kde.org>
+ * @author Rik Hemsley <rik@kde.org>
+ */
+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:
+ *
+ * <PRE>
+ *  const char* test1;
+ *  KMD5::Digest rawResult;
+ *
+ *  test1 = "This is a simple test.";
+ *  KMD5 context (test1);
+ *  cout << "Hex Digest output: " << context.hexDigest().data() << endl;
+ * </PRE>
+ *
+ * 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:
+ *
+ * <PRE>
+ *  context.reset ();
+ *  context.update ("TWO");
+ *  context.update ("THREE");
+ *  cout << "Hex Digest output: " << context.hexDigest().data() << endl;
+ * </PRE>
+ *
+ * @short An adapted C++ implementation of RSA Data Securities MD5 algorithm.
+ * @author Dirk Mueller <mueller@kde.org>, Dawit Alemayehu <adawit@kde.org>
+ */
+
+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 <b>not</b> 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<const unsigned char*>(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