linux - Implement an algorithm in bash -

i have following algorithm, , want implement in bash.

void wepkey64(char *passphrase, unsigned char k64[4][5]) {     unsigned char pseed[4] = {0};     unsigned int randnumber, tmp;     int i, j;      for(i = 0; < strlen(passphrase); i++)     {         pseed[i%4] ^= (unsigned char) passphrase[i];     }      randnumber = pseed[0] | (pseed[1] << 8) | (pseed[2] << 16) | (pseed[3] << 24);      (i = 0; < 4; i++)     {         (j = 0; j < 5; j++)         {             randnumber = (randnumber * 0x343fd + 0x269ec3) & 0xffffffff;             tmp = (randnumber >> 16) & 0xff;             k64[i][j] = (unsigned char) tmp;         }     } } 

what's equivalent of function in bash?

are sure /bin/sh on system bourne shell? on many systems /bin/sh boune-again shell (bash).. can check with:

sh --version 

if have access gawk, has bitwise operators described here: http://www.gnu.org/software/gawk/manual/html_node/bitwise-functions.html

i think original awk may lack these operators. again, sh , bash, awk gawk on many systems.