Subversion Repositories planix.SVN

#include <u.h>
#include <libc.h>
#include <bio.h>
#include <mp.h>
#include <libsec.h>

void
usage(void)
{
        fprint(2, "auth/asn12dsa [-t tag] [file]\n");
        exits("usage");
}

void
main(int argc, char **argv)
{
        char *s;
        uchar *buf;
        int fd;
        long n, tot;
        char *tag, *file;
        DSApriv *key;

        fmtinstall('B', mpfmt);

        tag = nil;
        ARGBEGIN{
        case 't':
                tag = EARGF(usage());
                break;
        default:
                usage();
        }ARGEND

        if(argc != 0 && argc != 1)
                usage();

        if(argc == 1)
                file = argv[0];
        else
                file = "/dev/stdin";

        if((fd = open(file, OREAD)) < 0)
                sysfatal("open %s: %r", file);
        buf = nil;
        tot = 0;
        for(;;){
                buf = realloc(buf, tot+8192);
                if(buf == nil)
                        sysfatal("realloc: %r");
                if((n = read(fd, buf+tot, 8192)) < 0)
                        sysfatal("read: %r");
                if(n == 0)
                        break;
                tot += n;
        }

        key = asn1toDSApriv(buf, tot);
        if(key == nil)
                sysfatal("couldn't parse asn1 key");

        s = smprint("key proto=dsa %s%sp=%B q=%B alpha=%B key=%B !secret=%B\n",
                tag ? tag : "", tag ? " " : "",
                key->pub.p, key->pub.q, key->pub.alpha, key->pub.key,
                key->secret);
        if(s == nil)
                sysfatal("smprint: %r");
        write(1, s, strlen(s));
        exits(0);
}