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    SubjectRe: password encryption
    On Tue, 3 Aug 1999, ywlee wrote:

    > hi,
    >
    > how do I implement a encryption algorithm for a password in C?
    > I'm writing this code in Linux. I have tried to use the crypt()
    > function from unistd.h but I cannot compile because of undefined
    > reference. Please help. :)
    >
    > -
    > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    > the body of a message to majordomo@vger.rutgers.edu
    > Please read the FAQ at http://www.tux.org/lkml/
    >

    See attached code to generate encrypted passwd's. It should generalize
    well enough.

    rgb

    Robert G. Brown http://www.phy.duke.edu/~rgb/
    Duke University Dept. of Physics, Box 90305
    Durham, N.C. 27708-0305
    Phone: 1-919-660-2567 Fax: 919-660-2525 email:rgb@phy.duke.edu

    #%< Snip Snip Snip ====================================================

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

    static char rcs_id[]="$Id: makepw.c,v 1.1.1.1 1998/10/15 05:46:33 rgb Exp $ (Robert G. Brown)";

    char *crypt();

    main(argc, argv)
    int argc;
    char **argv;
    {
    char *s,passwd[128],salt[8];
    unsigned long i,iterations;

    if(argc != 3) {
    fprintf(stderr, "usage: makepw passwd salt\n");
    exit(1);
    }
    argv++;
    sprintf(passwd,"%s",*argv);
    /* Truncate passwd at eight characters on general principles.*/
    passwd[8] = 0;
    argv++;
    sprintf(salt,"%s",*argv);
    /* Truncate salt at two characters, ditto. */
    salt[2] = 0;
    s=crypt(passwd,salt);
    printf("%s\n",s);
    exit(0);
    }



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