FB chat as Text Message on your Mobile

Many times you may see my chat status is available. But mostly I m off-line. Your all IM send on my phone. So please understand this fact, if I am not replied on chat...

Now don't ask hows this possible. I m giving the answer.
Use yahoo messenger and register your mobile on it. And register your mobile for yahoo mobile contact. Then import all your facebook contact into that yahoo account. And done. You receive a text message from +5824119 or else.

*Tip :
1. This feature is available only for Yahoo India Messenger 11
2. You receive only 3 messages from a single contact at a single day...

GRE Mathematics Test Practice Book

GRE Mathematics Test Practice Book

Read out this book. Its ETS official book for GRE.

Enjoy

TOEFL Links

Hello Friends,
I found some of the important links. These links will helpful for TOEFL. Please check out, it may help u lot. If you found it is good tell others. Else shut your mouth.

http://gotoefl.blogspot.com/

http://www.stuff.co.uk/toefl.htm

http://www.thetoefl.com/

http://www.ets.org/Media/Tests/TOEFL/exe/toeflSample.exe

GRE Important Link

Hello Friends,
I found some of the important links. These links will helpful for GRE. Please check out, it may help u lot. If you found it is good tell others. Else shut your mouth.

http://gredownloads.blogspot.com/

http://gredownloads.blogspot.com/2008/07/gre-barrons-audio-wordlist-by-profm.html

http://rs13.rapidshare.com/files/101496851/advanced_english_dictionary.rar

http://www.achieverspoint.com/winoverwords.htm

http://www.blogcatalog.com/blog/gre-picture-dictionary

http://www.usingenglish.com/

http://www.enchantedlearning.com/alphabet/matchwordsandpix/

http://www.manythings.org/lulu/

http://allaboutgre.blogspot.com/2006/01/sample-essays.html

http://gre-download.blogspot.com/

http://www.greguide.com

http://www.online-languages.info/_ud2/dictionary.php?l1=english&l2=marathi

http://www.statementofpurpose.com/essay_samples.html

http://www.accesseducationindia.com/gre-engineering-ms.html

http://greghost.blogspot.com/2006/09/free-gre-downloads_05.html

http://grebag.blogspot.com/

http://www.codecoax.com/grerc/

http://www.info-gre.blogspot.com/

http://gre.complore.com/

http://gre.learnhub.com/

NIS HMAC Implementation

#include
#include
#include

#define SIZE 64

typedef unsigned char uchar ;
int main ( int argc, char * argv[] )
{
FILE * kfp ;
FILE * ifp ;
FILE * ofp ;
FILE * tfp ;
uchar c[2] ;
uchar ch;
uchar key[SIZE] = { 0x00 } ;
uchar ipad[SIZE] ;
uchar opad[SIZE] ;
uchar command[100] ;
int i;

if ( 4 != argc )
{
printf( "Incorrect Usage!\n" ) ;
printf( "Correct Usage is ./hmac

" ) ;
}
for ( i = 0; i < SIZE; i++ )
{
ipad[i] = 0x36 ;
opad[i] = 0x5C ;
}


kfp = fopen( argv[1], "r+b" ) ;
ofp = fopen( argv[3], "w+b" ) ;
tfp = fopen( "temp", "w+b" ) ;

fread( key, sizeof( uchar ), SIZE, kfp ) ;
fclose ( kfp );

for ( i = 0; i < SIZE; i++ )
{
key[i] = key[i] ^ ipad[i] ;
}

fwrite( key, sizeof( uchar ), SIZE, tfp ) ;
fclose( tfp ) ;

sprintf( command, "cat %s >> temp", argv[2]) ;
system( command ) ;
system( "./md5 temp > temp1" ) ;

kfp = fopen( argv[1], "r+b" ) ;
fread( key, sizeof( uchar ), SIZE, kfp ) ;
fclose ( kfp );
for ( i = 0; i < SIZE; i++ )
{
key[i] = key[i] ^ opad[i] ;
fwrite( &key[i], sizeof( uchar ), 1, ofp ) ;
}

tfp = fopen( "temp1", "r+b" ) ;
for ( i = 0; i < 16; i++ )
{
fread( c, sizeof( uchar ), 2, tfp );
c[0] -= '0' ;
if ( c[0] > 9 )
{
c[0] = c[0] + '0' - 'a' + 10 ;
}

c[1] -= '0' ;
if ( c[1] > 9 )
{
c[1] = c[1] + '0' - 'a' + 10 ;
}
ch = ( c[0] << 4 ) | c[1] ;
fwrite( &ch, sizeof( uchar ), 1, ofp ) ;
}
fclose( ofp ) ;

sprintf( command, "./md5 %s > temp", argv[3] ) ;
system( command ) ;
system( "cat temp" ) ;
printf( "\n" ) ;

return 0;
}

//OUTPUT:

root@root:~$ ./a.out key.txt hmac.c output.txt
7d1ef72ee877ec646f700288e0693462


Kaeyfile contents:
MHCVGFDC&^$$#@%^MHCVGFDC&^$$#@%^MHCVGFDC&^$$#@%^MHCVGFDC&^$$#@%^

NIS SDES Implementation

#include
#include

typedef unsigned short int uint16 ;
typedef unsigned char uchar;

#define BIT( b, n ) ( ( b >> n ) & 0x01 )

uint16 p10( uint16 );
uint16 p8( uint16 );
uint16 p4( uint16 ) ;
uint16 ip( uint16 );
uint16 ip_inv( uint16 );
uint16 ep( uint16 );
uint16 swap( uint16 );
void print( uint16 );
void genkeys( uint16, uint16*, uint16* );
uint16 encrypt( uint16, uint16, uint16) ;



uint16 S0[4][4] =
{
{ 1, 0, 3, 2 },
{ 3, 2, 1, 0 },
{ 0, 2, 1, 3 },
{ 3, 1, 0, 3 }
};
uint16 S1[4][4] =
{
{ 0, 1, 2, 3 },
{ 2, 0, 1, 3 },
{ 3, 0, 1, 0 },
{ 2, 1, 0, 3 }
};


void dispCorrectUsage()
{
printf( "Incorrect Usage!\n" ) ;
printf( "Correct Usage is: [

]\n" ) ;
printf( "Options:\n\t-e : Encrypt input file\n\t-d: Decrypt Input file\n" ) ;
printf( "If output file is missing, the output is redirected to the standard output\n" ) ;
return;
}

int main ( int argc, char * argv[] )
{
uint16 input,output;
uint16 key,key1,key2;
uint16 tmp;
FILE * ifp;
FILE * ofp;
uchar ch;

key = 0x097;
genkeys( key, &key1, &key2 );

if ( ( argc < 2 ) || ( argc > 4 ) )
{
dispCorrectUsage();
exit( EXIT_FAILURE ) ;
}

ifp = fopen( argv[2], "r+b" ) ;
if ( NULL == ifp )
{
printf( "Unable to open Input file!\n" ) ;
exit( EXIT_FAILURE ) ;
}

if ( 4 == argc )
{
ofp = fopen( argv[3], "w+b" );
if ( NULL == ofp )
{
printf( "Unable to open Output file!\n" ) ;
exit( EXIT_FAILURE ) ;
}
}
else
{
ofp = stdout;
}

genkeys( key, &key1, &key2 );

if ( '-' == argv[1][0] )
{
if ( 'e' == argv[1][1] )
{
while ( 0 != ( fread( &ch, sizeof( uchar ), 1, ifp ) ) )
{
input = ( uint16 ) ch;
output = encrypt( input, key1, key2 ) ;
ch = ( uchar ) output;
fwrite( &ch, sizeof( uchar ), 1, ofp ) ;
}
}
else if ( 'd' == argv[1][1] )
{
while ( 0 != ( fread( &ch, sizeof( uchar ), 1, ifp ) ) )
{
input = ( uint16 ) ch;
output = encrypt( input, key2, key1 ) ;
ch = ( uchar ) output;
fwrite( &ch, sizeof( uchar ), 1, ofp ) ;
}

}
}

return 0;
}

//9876543210 -> 7583609124
uint16 p10 ( uint16 num )
{
uint16 temp = 0x00 ;

temp |= BIT( num, 7 ) << 9;
temp |= BIT( num, 5 ) << 8;
temp |= BIT( num, 8 ) << 7;
temp |= BIT( num, 3 ) << 6;
temp |= BIT( num, 6 ) << 5;
temp |= BIT( num, 0 ) << 4;
temp |= BIT( num, 9 ) << 3;
temp |= BIT( num, 1 ) << 2;
temp |= BIT( num, 2 ) << 1;
temp |= BIT( num, 4 );

return temp ;
}

//9876543210 -> 47362501
uint16 p8( uint16 num )
{
uint16 temp = 0x00 ;

temp |= BIT( num, 4 ) << 7;
temp |= BIT( num, 7 ) << 6;
temp |= BIT( num, 3 ) << 5;
temp |= BIT( num, 6 ) << 4;
temp |= BIT( num, 2 ) << 3;
temp |= BIT( num, 5 ) << 2;
temp |= BIT( num, 0 ) << 1;
temp |= BIT( num, 1 );

return temp;
}

//3210 -> 2013
uint16 p4( uint16 num )
{
uint16 temp = 0x00;

temp |= BIT( num, 2 ) << 3;
temp |= BIT( num, 0 ) << 2;
temp |= BIT( num, 1 ) << 1;
temp |= BIT( num, 3 ) ;

return temp;
}

//76543210 -> 62574031
uint16 ip( uint16 num )
{
uint16 temp = 0x00;

temp |= BIT( num, 6 ) << 7;
temp |= BIT( num, 2 ) << 6;
temp |= BIT( num, 5 ) << 5;
temp |= BIT( num, 7 ) << 4;
temp |= BIT( num, 4 ) << 3;
temp |= BIT( num, 0 ) << 2;
temp |= BIT( num, 3 ) << 1;
temp |= BIT( num, 1 );

return temp;
}


//76543210 -> 47531602
uint16 ip_inv( uint16 num )
{
uint16 temp = 0x00;

temp |= BIT( num, 4 ) << 7;
temp |= BIT( num, 7 ) << 6;
temp |= BIT( num, 5 ) << 5;
temp |= BIT( num, 3 ) << 4;
temp |= BIT( num, 1 ) << 3;
temp |= BIT( num, 6 ) << 2;
temp |= BIT( num, 0 ) << 1;
temp |= BIT( num, 2 );

return temp;
}


//3210 -> 03212103
uint16 ep( uint16 num )
{
uint16 temp = 0x00;

temp |= BIT( num, 0 ) << 7;
temp |= BIT( num, 3 ) << 6;
temp |= BIT( num, 2 ) << 5;
temp |= BIT( num, 1 ) << 4;
temp |= BIT( num, 2 ) << 3;
temp |= BIT( num, 1 ) << 2;
temp |= BIT( num, 0 ) << 1;
temp |= BIT( num, 3 );

return temp;
}

//76543210 -> 32107654
uint16 swap( uint16 num )
{
uint16 temp = 0x00;

temp |= BIT( num, 3 ) << 7;
temp |= BIT( num, 2 ) << 6;
temp |= BIT( num, 1 ) << 5;
temp |= BIT( num, 0 ) << 4;
temp |= BIT( num, 7 ) << 3;
temp |= BIT( num, 6 ) << 2;
temp |= BIT( num, 5 ) << 1;
temp |= BIT( num, 4 );

return temp;
}

// rotate x left y bits, total size is 5 bits
#define ROT_L5(x,y) ((( (x) << (y) ) | ( (x) >> (5-y) )) & 0x1F )
// get the right 5 bits of x
#define RIGHT5(x) ( (x) & 0x1F )
// get the left 5 bits of x
#define LEFT5(x) ( ( (x) >> 5 ) & 0x1F )
// get the right 4 bits of x
#define RIGHT4(x) ( (x) & 0x0F )
// get the left 4 bits of x
#define LEFT4(x) ( ( (x) >> 4 ) & 0x0F )



void print( uint16 num )
{
int i;

for ( i = 9; i >= 0; i-- )
{
printf( "%u", BIT( num, i ) ) ;
}

return;
}

// Generating the two keys
void genkeys( uint16 key, uint16* key1, uint16* key2 )
{
uint16 k1, k2;
uint16 temp;
uint16 left, right;

temp = p10( key ) ;
left = LEFT5( temp ) ;
right = RIGHT5( temp ) ;

left = ROT_L5( left, 1 );
right = ROT_L5( right, 1 );
temp = ( left << 5 ) | right ;
k1 = p8( temp ) ;

left = ROT_L5( left, 2 ) ;
right = ROT_L5( right, 2 ) ;
temp = ( left << 5 ) | right ;
k2 = p8( temp ) ;

*key1 = k1;
*key2 = k2;
return;
}

uint16 F( uint16 input, uint16 key )
{
uint16 answer= 0x00;
uint16 temp;
uint16 left;
uint16 right;
uint16 row, col;

temp = ep( input ) ;
temp = temp ^ key;
left = LEFT4( temp );
right = RIGHT4( temp );

row = ( BIT(left, 3 ) << 1 ) | BIT(left, 0 );
col = ( BIT(left, 2 ) << 1 ) | BIT(left, 1 );
answer = S0[row][col] << 2;

row = ( BIT(right, 3 ) << 1 ) | BIT(right, 0 );
col = ( BIT(right, 2 ) << 1 ) | BIT(right, 1 );
answer |= S1[row][col];

answer = p4( answer ) ;

return answer;
}


// fk(L,R,SK) = ( L ^ F(R,SK),R )
uint16 f_k( uint16 input, uint16 key )
{
uint16 answer;
uint16 left, right;
uint16 temp;

left = LEFT4( input ) ;
right = RIGHT4( input );
temp = left ^ F( right, key );
answer = ( temp << 4 ) | right ;

return answer;
}


uint16 encrypt( uint16 input, uint16 key1, uint16 key2 )
{
uint16 answer;
uint16 temp;

temp = ip( input ) ;
temp = f_k( temp, key1 ) ;
temp = swap( temp ) ;
temp = f_k( temp, key2 ) ;
answer = ip_inv( temp ) ;

return answer;
}


//OUTPUT:

C:\TC\BIN>sdes -e ip.txt op.txt

C:\TC\BIN>sdes -d op.txt
Hello World

ip.txt:-
Hello World

op.txt:-
SĺºgEég«º”

Program for sum of series

//Program to calculate the sum of series

#include
#include
long int factorial(int n);
void main()
{
int n,i;
float s,r;
char c;
clrscr();
repeat : printf("\nYou have this series:- 1/1! + 2/2! + 3/3! + 4/4! ...");
printf("\n\nTo which term you want its sum? ");
scanf("%d",&n);
s=0;
for (i=1;i<=n;i++)
{ s=s+((float)i/(float)factorial(i)); }
printf("\nThe sum of '[%d]' terms is : %f",n,s);
fflush(stdin);
printf ("\n\nDo you want to continue?(y/n):- ");
scanf("%c",&c);
if (c=='y')
goto repeat;
getch();
}

long int factorial(int n)
{
if (n<=1)
return(1);
else
n=n*factorial(n-1);
return(n);
}