RSApriv*getrsakey(int argc, char **argv, int needprivate, Attr **pa);
uchar*  put4(uchar *p, uint n);
uchar*  putmp2(uchar *p, mpint *b);
uchar*  putn(uchar *p, void *v, uint n);
uchar*  putstr(uchar *p, char *s);