ref: c1d40df49550393f3afe53fb6e6d500dfa8eb7a8
dir: /sys/src/cmd/auth/x5092pub.c/
#include <u.h> #include <libc.h> #include <bio.h> #include <auth.h> #include <mp.h> #include <libsec.h> int fd; int req = 0; char subject[1024]; void usage(void) { fprint(2, "usage: auth/x5092pub [-r] [file]\n"); exits("usage"); } void main(int argc, char **argv) { int tot, n; char *s; uchar *buf; RSApub *pub; quotefmtinstall(); fmtinstall('B', mpfmt); fmtinstall('H', encodefmt); ARGBEGIN{ case 'r': req = 1; break; default: usage(); }ARGEND fd = 0; if(argc == 1) fd = open(argv[0], OREAD); else if(argc != 0) usage(); 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; } if(req) pub = X509reqtoRSApub(buf, tot, subject, sizeof(subject)); else pub = X509toRSApub(buf, tot, subject, sizeof(subject)); if(pub == nil) sysfatal("X509toRSApub: %r"); s = smprint("key proto=rsa size=%d ek=%B n=%B subject=%q \n", mpsignif(pub->n), pub->ek, pub->n, subject); if(s == nil) sysfatal("smprint: %r"); if(write(1, s, strlen(s)) != strlen(s)) sysfatal("write: %r"); exits(nil); }