sys/src/cmd/auth/asn12rsa.c

   1 #include <u.h>
   2 #include <libc.h>
   3 #include <bio.h>
   4 #include <mp.h>
   5 #include <libsec.h>
   6
   7 void
   8 usage(void)
   9 {
  10         fprint(2, "auth/asn12rsa [-t tag] [file]\n");
  11         exits("usage");
  12 }
  13
  14 void
  15 main(int argc, char **argv)
  16 {
  17         char *s;
  18         uchar *buf;
  19         int fd;
  20         long n, tot;
  21         char *tag, *file;
  22         RSApriv *key;
  23         RSApub *pub;
  24
  25         fmtinstall('B', mpfmt);
  26
  27         tag = nil;
  28         ARGBEGIN{
  29         case 't':
  30                 tag = EARGF(usage());
  31                 break;
  32         default:
  33                 usage();
  34         }ARGEND
  35
  36         if(argc != 0 && argc != 1)
  37                 usage();
  38
  39         if(argc == 1)
  40                 file = argv[0];
  41         else
  42                 file = "#d/0";
  43
  44         if((fd = open(file, OREAD)) < 0)
  45                 sysfatal("open %s: %r", file);
  46         buf = nil;
  47         tot = 0;
  48         for(;;){
  49                 buf = realloc(buf, tot+8192);
  50                 if(buf == nil)
  51                         sysfatal("realloc: %r");
  52                 if((n = read(fd, buf+tot, 8192)) < 0)
  53                         sysfatal("read: %r");
  54                 if(n == 0)
  55                         break;
  56                 tot += n;
  57         }
  58         key = asn1toRSApriv(buf, tot);
  59         if(key != nil){
  60                 s = smprint("key proto=rsa %s%ssize=%d ek=%B !dk=%B n=%B !p=%B !q=%B !kp=%B !kq=%B !c2=%B\n",
  61                         tag ? tag : "", tag ? " " : "",
  62                         mpsignif(key->pub.n), key->pub.ek,
  63                         key->dk, key->pub.n, key->p, key->q,
  64                         key->kp, key->kq, key->c2);
  65         } else {
  66                 pub = asn1toRSApub(buf, tot);
  67                 if(pub == nil)
  68                         sysfatal("couldn't parse asn1 key");
  69                 s = smprint("key proto=rsa %s%ssize=%d ek=%B n=%B\n",
  70                         tag ? tag : "", tag ? " " : "",
  71                         mpsignif(pub->n), pub->ek, pub->n);
  72         }
  73         if(s == nil)
  74                 sysfatal("smprint: %r");
  75         write(1, s, strlen(s));
  76         exits(0);
  77 }