[Gcblue-commits] gcb_wx/src/database md5c.c,NONE,1.1 md5class.cpp,NONE,1.1 tcAccountDatabase.cpp,NONE,1.1

[Dewitt C. <ddc...@us...>]

Update of /cvsroot/gcblue/gcb_wx/src/database
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv11225/src/database

Added Files:
	md5c.c md5class.cpp tcAccountDatabase.cpp 
Log Message:
added player name to connection status, update rates are slower for non-controlled objects, non-controlled objects now display as green, added chat text popup

--- NEW FILE: md5class.cpp ---
// md5class.cpp: implementation of the CMD5 class.
//See internet RFC 1321, "The MD5 Message-Digest Algorithm"
//
//Use this code as you see fit. It is provided "as is"
//without express or implied warranty of any kind.

//////////////////////////////////////////////////////////////////////

#include "md5class.h"
#include "md5.h" //declarations from RFC 1321
#include <string.h>	  
#include <stdio.h>

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CMD5::CMD5()
{
	m_digestValid = false; //we don't have a plaintext string yet
	m_digestString[32]=0;  //the digest string is always 32 characters, so put a null in position 32
}

CMD5::~CMD5()
{

}

CMD5::CMD5(const char* plainText)  
{	
	m_plainText = plainText; 

   	m_digestString[32] = 0;
	m_digestValid = calcDigest();
}

CMD5::CMD5(const std::string& plainText)
{
	m_plainText = plainText.c_str(); 

   	m_digestString[32] = 0;
	m_digestValid = calcDigest();    
}

//////////////////////////////////////////////////////////////////////
// Implementation
//////////////////////////////////////////////////////////////////////

bool CMD5::operator==(const CMD5& rhs)
{
    if (!isDigestValid() || !rhs.isDigestValid())
    {
        return false;
    }
    
    const char* rhsDigest = rhs.getMD5Digest();
    int result = strncmp(m_digestString, rhsDigest , 33);
    return (result == 0);
}

bool CMD5::isDigestValid() const
{
    return m_digestValid;
}

void CMD5::setPlainText(const char* plainText)
{
  //set plaintext with a mutator, it's ok to 
  //to call this multiple times.  If casting away the const-ness of plainText 
  //worries you, you could either make a local copy of the plain 
  //text string instead of just pointing at the user's string, or 
  //modify the RFC 1321 code to take 'const' plaintext, see example below. 

  m_plainText = const_cast<char*>(plainText);
  m_digestValid = calcDigest();
}

/* Use a function of this type with your favorite string class
   if casting away the const-ness of the user's text buffer violates you
   coding standards. 

void CMD5::setPlainText(CString& strPlainText)
{
	static CString plaintext(strPlainText);
	m_plainText = strPlainText.GetBuffer();
	m_digestValid = calcDigest();
}
*/

const char* CMD5::getMD5Digest() const
 {	//access message digest (aka hash), return 0 if plaintext has not been set
	if(m_digestValid)
	{
		return m_digestString;
	} 
    else 
    {
        return 0;
    }
 }




bool CMD5::calcDigest()
{
  //See RFC 1321 for details on how MD5Init, MD5Update, and MD5Final 
  //calculate a digest for the plain text
  MD5_CTX context;
  MD5Init(&context); 

  //the alternative to these ugly casts is to go into the RFC code and change the declarations
  unsigned int plainTextLength =  (unsigned int)m_plainText.length();
  unsigned char* plainText = reinterpret_cast<unsigned char *>(const_cast<char *>(m_plainText.c_str()));
  MD5Update(&context, plainText, plainTextLength);
  MD5Final(reinterpret_cast <unsigned char *>(m_digest),&context);
  
  //make a string version of the numeric digest value
  int p=0;
  for (int i = 0; i<16; i++)
  {
	::sprintf(&m_digestString[p],"%02x", m_digest[i]);
	p+=2;
  }
  return true;
}



--- NEW FILE: tcAccountDatabase.cpp ---
/**  
**  @file tcAccountDatabase.cpp
*/
/*  Copyright (C) 2005 Dewitt Colclough (de...@tw...)
**  All rights reserved.
**
**  This file is part of the Global Conflict Blue (GCB) program.
**  GCB is free software; you can redistribute it and/or modify
**  it under the terms of version 2 of the GNU General Public License as 
**  published by the Free Software Foundation.
**
**  GCB 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 General Public License
**  along with GCB; if not, write to the Free Software
**  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include "stdwx.h"
#include "wx/datetime.h"

#include "tcAccountDatabase.h"
#include "sqlite/sqlite_plus.h"
#include "md5class.h"
#include <sstream>

#ifdef _DEBUG
#define new DEBUG_NEW
#endif




tcAccountDatabase* tcAccountDatabase::Get()
{
	static tcAccountDatabase instance;

	return &instance;
}




int tcAccountDatabase::AddUser(const std::string& user, const std::string& hash,
							   const std::string& email)
{
	try
	{
		if (GetUserData(user, cachedUserData))
		{
			return DUPLICATE_USER;
		}
		
		std::string hashStore = "";
		if (hash.size() > 0)
		{
			hashStore = GetMD5digest(hash);
		}

		wxString s = wxString::Format("insert into %s (UserName,PasswordHash,Email) "
			"values (\'%s\',\'%s\',\'%s\');", 
			tableName.c_str(), user.c_str(), hashStore.c_str(), email.c_str());

		accountDatabase->executenonquery(s.c_str());

		return SUCCESS;

	}
	catch (exception& ex)
	{
		wxMessageBox(ex.what(), "Error", wxICON_ERROR);
		return UNKNOWN_ERROR;
	}

}

/**
* If password is empty in database, store hash as password and return SUCCESS
*/
int tcAccountDatabase::AuthenticateUser(const std::string& user, const std::string& hash)
{
	std::string hashCompare = GetMD5digest(hash);

	if (GetUserData(user, cachedUserData))
	{
		if (cachedUserData.password_hash.size() == 0)
		{
			cachedUserData.password_hash = hashCompare;
			return UpdateDatabaseEntry(cachedUserData);
		}
		else if (cachedUserData.password_hash == hashCompare)
		{
			return SUCCESS;
		}
		else
		{
			return PASSWORD_INVALID;
		}
	}
	else
	{
		return USER_NOT_FOUND;
	}
}

std::string tcAccountDatabase::ErrorCodeToString(int code)
{
	std::string s;

	if (code == SUCCESS)
	{
		s = "Success";
	}
	else if (code == USER_NOT_FOUND)
	{
		s = "Username not found";
	}
	else if (code == PASSWORD_INVALID)
	{
		s = "Invalid password";
	}
	else if (code == DUPLICATE_USER)
	{
		s = "Username already exists";
	}
	else if (code == DUPLICATE_LOGIN)
	{
		s = "User already logged in";
	}
	else
	{
		s = "Unknown error";
	}

	return s;
}

const char* tcAccountDatabase::GetMD5digest(const char* plainText)
{
	md5->setPlainText(plainText);

	return md5->getMD5Digest();
}

const char* tcAccountDatabase::GetMD5digest(const std::string& plainText)
{
	return GetMD5digest(plainText.c_str());
}


bool tcAccountDatabase::GetUserData(const std::string& user, UserData& userData)
{
	sqlite::reader tableData = accountDatabase->executereader(
		"select * from %s where UserName='%s';", tableName.c_str(), user.c_str());

	if (tableData.read())
	{
		userData.username = user;
		userData.alliance = (unsigned int)tableData.getint(LookupFieldIndex("Alliance"));
		userData.email = tableData.getstring(LookupFieldIndex("Email"));
		userData.last_ip = tableData.getstring(LookupFieldIndex("LastIP"));
		userData.last_login = (unsigned long)tableData.getlong(LookupFieldIndex("LastLogin"));
		userData.last_logout = (unsigned long)tableData.getlong(LookupFieldIndex("LastLogout"));
		userData.login_count = (unsigned int)tableData.getint(LookupFieldIndex("LoginCount"));
		userData.password_hash = tableData.getstring(LookupFieldIndex("PasswordHash"));
		userData.score = tableData.getdouble(LookupFieldIndex("Score"));
		userData.flags = tableData.getdouble(LookupFieldIndex("Flags"));
		
		tableData.close(); // VERY important to do this, otherwise prevents future writes to database
		return true;
	}
	else
	{
		userData.username = "";
		tableData.close();
		return false; // user not found, no data available
	}
}


tcAccountDatabase::UserData& tcAccountDatabase::GetCachedUserData(const std::string& user)
{
	if (cachedUserData.username != user)
	{
		GetUserData(user, cachedUserData);
	}

	return cachedUserData;
}

void tcAccountDatabase::Initialize()
{
	wxASSERT(accountDatabase == 0);
	
	try
	{
		accountDatabase = new sqlite::connection(databasePath.c_str());

		// build column lookup
		columnLookup.clear();
		sqlite::reader tableInfo = accountDatabase->executereader(
			"pragma table_info(%s);", tableName.c_str());

		unsigned int fieldCount = 0;

		while (tableInfo.read())
		{
			columnLookup[std::string(tableInfo[1])] = fieldCount++;
		}

		md5 = new CMD5;
	}
	catch (exception& ex)
	{
		fprintf(stderr, "%s\n", ex.what());
	}

}

bool tcAccountDatabase::IsUserLoggedIn(const std::string& user)
{	
	UserData& data = GetCachedUserData(user);
	if (data.username.size() == 0)
	{   
		return false; // user not found
	}
	return (data.last_login > data.last_logout);
}


int tcAccountDatabase::LogIn(const std::string& user, const std::string ipAddress)
{
	UserData& data = GetCachedUserData(user);
	if (data.username.size() == 0)
	{   
		return USER_NOT_FOUND; // user not found
	}

	wxDateTime now = wxDateTime::Now();
	unsigned long currentTime = now.GetTicks();

	data.last_ip = ipAddress;
	data.last_login = currentTime;
	data.login_count++;

	return UpdateDatabaseEntry(data);
}


int tcAccountDatabase::LogOut(const std::string& user)
{
	UserData& data = GetCachedUserData(user);
	if (data.username.size() == 0)
	{   
		return USER_NOT_FOUND; // user not found
	}

	wxDateTime now = wxDateTime::Now();
	unsigned long currentTime = now.GetTicks();

	data.last_logout = currentTime;

	return UpdateDatabaseEntry(data);
}

/**
* @return index of field or -1 if not found
*/
int tcAccountDatabase::LookupFieldIndex(const std::string& field)
{
	std::map<std::string, unsigned int>::const_iterator mapIter;

	mapIter = columnLookup.find(field);
	if (mapIter == columnLookup.end()) 
	{
		return -1;
	}
	else
	{
		return mapIter->second;
	}
}

int tcAccountDatabase::SetUserAlliance(const std::string& user, unsigned int alliance)
{
	UserData& data = GetCachedUserData(user);
	if (data.username.size() == 0)
	{   
		return USER_NOT_FOUND; // user not found
	}

	data.alliance = alliance;

	return UpdateDatabaseEntry(data);
}


int tcAccountDatabase::UpdateDatabaseEntry(UserData& userData)
{
	std::stringstream valueString;


	valueString << "PasswordHash='" << userData.password_hash << "',";
	valueString << "Email='" << userData.email << "',";
	valueString << "LastIP='" << userData.last_ip << "',";
	valueString << "LastLogin=" << userData.last_login << ",";
	valueString << "LastLogout=" << userData.last_logout << ",";
	valueString << "LoginCount=" << userData.login_count << ",";
	valueString << "Alliance=" << userData.alliance << ",";
	valueString << "Score=" << userData.score << ",";
	valueString << "Flags=" << userData.flags;

	wxString s = wxString::Format("UPDATE OR IGNORE %s SET %s WHERE UserName='%s';",
		tableName.c_str(), valueString.str().c_str(), userData.username.c_str());

	try
	{
		accountDatabase->executenonquery(s.c_str());
	}
	catch (exception& ex)
	{
		fprintf(stderr, "UpdateDatabaseEntry - %s (%s)\n", ex.what(), s.c_str());
	}

	return SUCCESS;
}


void tcAccountDatabase::TestUpdate()
{
	std::stringstream valueString;

	
	valueString << "PasswordHash='" << "" << "',";
	valueString << "Email='" << "" << "',";
	valueString << "LastIP='" << "192.168.0.9" << "',";
	valueString << "LastLogin=" << 72 << ",";
	valueString << "LastLogout=" << 83 << ",";
	valueString << "LoginCount=" << 5;
	

	wxString s = wxString::Format("UPDATE OR IGNORE %s SET %s WHERE UserName='%s';",
		tableName.c_str(), valueString.str().c_str(), "dewitt");

//	wxString s = wxString::Format("UPDATE OR IGNORE account_info SET PasswordHash='64sdkljlskdjfkjsdlkjf',Email='',LoginCount=5,LastIP='blabbity',LastLogin=72,LastLogout=83 WHERE UserName='dewitt';");
		

	try
	{
		accountDatabase->executenonquery(s.c_str());
	}
	catch (exception& ex)
	{
		fprintf(stderr, "test UpdateDatabaseEntry - %s (%s)\n", ex.what(), s.c_str());
	}
}

tcAccountDatabase::tcAccountDatabase()
:   accountDatabase(0),
    md5(0),
    databasePath("database\\accounts.db"),
	tableName("account_info")
{
	Initialize();
}

tcAccountDatabase::~tcAccountDatabase()

{
	delete accountDatabase;
}

--- NEW FILE: md5c.c ---
//See internet RFC 1321, "The MD5 Message-Digest Algorithm"

/* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
 */

/* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
rights reserved.

License to copy and use this software is granted provided that it
is identified as the "RSA Data Security, Inc. MD5 Message-Digest
Algorithm" in all material mentioning or referencing this software
or this function.

License is also granted to make and use derivative works provided
that such works are identified as "derived from the RSA Data
Security, Inc. MD5 Message-Digest Algorithm" in all material
mentioning or referencing the derived work.

RSA Data Security, Inc. makes no representations concerning either
the merchantability of this software or the suitability of this
software for any particular purpose. It is provided "as is"
without express or implied warranty of any kind.

These notices must be retained in any copies of any part of this
documentation and/or software.
 */


#include "md5.h"

/* Constants for MD5Transform routine.
 */

#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21

static void MD5Transform PROTO_LIST ((UINT4 [4],unsigned char [64]));
static void Encode PROTO_LIST
  ((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
  ((UINT4 *, unsigned char *, unsigned int));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

static unsigned char PADDING[64] = {
  0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};

/* F, G, H and I are basic MD5 functions.
 */
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

/* ROTATE_LEFT rotates x left n bits.
 */
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.
 */
#define FF(a, b, c, d, x, s, ac) { \
 (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }
#define GG(a, b, c, d, x, s, ac) { \
 (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }
#define HH(a, b, c, d, x, s, ac) { \
 (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }
#define II(a, b, c, d, x, s, ac) { \
 (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }

/* MD5 initialization. Begins an MD5 operation, writing a new context.
 */
void MD5Init (context)
MD5_CTX *context;                                        /* context */
{
  context->count[0] = context->count[1] = 0;
  /* Load magic initialization constants.
*/
  context->state[0] = 0x67452301;
  context->state[1] = 0xefcdab89;
  context->state[2] = 0x98badcfe;
  context->state[3] = 0x10325476;
}

/* MD5 block update operation. Continues an MD5 message-digest
  operation, processing another message block, and updating the
  context.
 */
void MD5Update (context, input, inputLen)
MD5_CTX *context;                         /* context */
unsigned char *input;                     /* input block */
unsigned int inputLen;                    /* length of input block */
{
  unsigned int i, index, partLen;

  /* Compute number of bytes mod 64 */
  index = (unsigned int)((context->count[0] >> 3) & 0x3F);

  /* Update number of bits */
  if ((context->count[0] += ((UINT4)inputLen << 3))

   < ((UINT4)inputLen << 3))
 context->count[1]++;
  context->count[1] += ((UINT4)inputLen >> 29);

  partLen = 64 - index;

  /* Transform as many times as possible.
*/
  if (inputLen >= partLen) {
 MD5_memcpy
   ((POINTER)&context->buffer[index], (POINTER)input, partLen);
 MD5Transform (context->state, context->buffer);

 for (i = partLen; i + 63 < inputLen; i += 64)
   MD5Transform (context->state, &input[i]);

 index = 0;
  }
  else
 i = 0;

  /* Buffer remaining input */
  MD5_memcpy
 ((POINTER)&context->buffer[index], (POINTER)&input[i],
  inputLen-i);
}

/* MD5 finalization. Ends an MD5 message-digest operation, writing the
  the message digest and zeroizing the context.
 */
void MD5Final (digest, context)
unsigned char digest[16];                         /* message digest */
MD5_CTX *context;                                       /* context */
{
  unsigned char bits[8];
  unsigned int index, padLen;

  /* Save number of bits */
  Encode (bits, context->count, 8);

  /* Pad out to 56 mod 64.
*/
  index = (unsigned int)((context->count[0] >> 3) & 0x3f);
  padLen = (index < 56) ? (56 - index) : (120 - index);
  MD5Update (context, PADDING, padLen);

  /* Append length (before padding) */
  MD5Update (context, bits, 8);

  /* Store state in digest */
  Encode (digest, context->state, 16);

  /* Zeroize sensitive information.
*/
  MD5_memset ((POINTER)context, 0, sizeof (*context));
}

/* MD5 basic transformation. Transforms state based on block.
 */
static void MD5Transform (state, block)
UINT4 state[4];
unsigned char block[64];
{
  UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];

  Decode (x, block, 64);

  /* Round 1 */
  FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
  FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
  FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
  FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
  FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
  FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
  FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
  FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
  FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
  FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
  FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
  FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
  FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
  FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
  FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
  FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */

 /* Round 2 */
  GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
  GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
  GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
  GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
  GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
  GG (d, a, b, c, x[10], S22,  0x2441453); /* 22 */
  GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
  GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
  GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
  GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
  GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */

  GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
  GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
  GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
  GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
  GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */

  /* Round 3 */
  HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
  HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
  HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
  HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
  HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
  HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
  HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
  HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
  HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
  HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
  HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
  HH (b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */
  HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
  HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
  HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
  HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */

  /* Round 4 */
  II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
  II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
  II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
  II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
  II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
  II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
  II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
  II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
  II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
  II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
  II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
  II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
  II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
  II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
  II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
  II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */

  state[0] += a;
  state[1] += b;
  state[2] += c;
  state[3] += d;

  /* Zeroize sensitive information.

*/
  MD5_memset ((POINTER)x, 0, sizeof (x));
}

/* Encodes input (UINT4) into output (unsigned char). Assumes len is
  a multiple of 4.
 */
static void Encode (output, input, len)
unsigned char *output;
UINT4 *input;
unsigned int len;
{
  unsigned int i, j;

  for (i = 0, j = 0; j < len; i++, j += 4) {
 output[j] = (unsigned char)(input[i] & 0xff);
 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
  }
}

/* Decodes input (unsigned char) into output (UINT4). Assumes len is
  a multiple of 4.
 */
static void Decode (output, input, len)
UINT4 *output;
unsigned char *input;
unsigned int len;
{
  unsigned int i, j;

  for (i = 0, j = 0; j < len; i++, j += 4)
 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
   (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
}

/* Note: Replace "for loop" with standard memcpy if possible.
 */

static void MD5_memcpy (output, input, len)
POINTER output;
POINTER input;
unsigned int len;
{
  unsigned int i;

  for (i = 0; i < len; i++)

 output[i] = input[i];
}

/* Note: Replace "for loop" with standard memset if possible.
 */
static void MD5_memset (output, value, len)
POINTER output;
int value;
unsigned int len;
{
  unsigned int i;

  for (i = 0; i < len; i++)
 ((char *)output)[i] = (char)value;
}