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pwd-gen.c

pwd-gen.c
Posted Mar 31, 2000
Authored by EF | Site ccitt5.net

pwd-gen.c is a password generator. Works well with user accounts.

tags | cracker
SHA-256 | ea69b02e4d1697e860fadf8f4fbbe0cb1f7006b1b1e7ee136b29cdcc266a015c

pwd-gen.c

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/* http://www.ccitt5.net/ */
/* gcc -o pwd-gen pwd-gen.c */

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<time.h>

#define PWD_SIZE 10 /* How long password should we generate? (PWD_SIZE -2) */

/* Initialize the seed, if we're on a linux system we use /dev/urandom */
/* else we use time() (yes, this solution is ugly.) */

int initseed(void){
FILE *rd;
int seed;

rd=fopen("/dev/urandom","r");
if(rd!=NULL){
fread(&seed,sizeof(int),1,rd);
fclose(rd);
} else {
seed=time(NULL);
}
return(seed);
}

/* Check that the 0-250 random value is a alphanumeric character */
/* and that it isn't in the list of "user confusing" characters */

int checkchar(int ch){

if(
((isalnum(ch)))&&
(ch!='l')&&(ch!='I')&&(ch!='O')&&
(ch!='0')&&(ch!='o')
)
return(1);
else
return(0);
}

int main(int argc, char *argv[]){
char pwd[PWD_SIZE];
char bc[2];
int ch;
int i;
int x;
int n_pass=5;
int seed;

/* We take one argument, how many passwords to generate */
/* if no value is given it defaults to 5 */

if(argc>1){
if(!isdigit(argv[1][0])){
printf("argument must be integer: %s",argv[1]);
exit(-1);
}
n_pass=atoi(argv[1]);
}

/* Get initial seed */
seed=initseed();

/* make N_PASS number of loops to generate password(s) */
for(i=0;i<n_pass;i++){
memset(pwd,0,PWD_SIZE);
x=0;
while(x<PWD_SIZE-2){
srandom(seed);
seed=random();
ch=1+(int) (250.0*random()/(RAND_MAX+1.0));
if(checkchar(ch)){
snprintf(bc,2,"%c",(char)ch);
strncat(pwd,bc,(PWD_SIZE-1)-(strlen(pwd)));
x++;
}
}
printf("%s\n",pwd);
}

/* All done - user can start to forget passwords now. */
return(1);
}

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