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i bet a lot of people didn't know what ssh 1.2.16 had a nice license.
well, except for the patent issues.  someone in sweden (forget their
name at the moment) cleaned out most of the patented code, and now
this code removes rsa code.  when this is done, it will link against
libssl, but the work isn't completely done yet.  then we need to bring
this up to modern days, featurewise.

/*

mpaux.h

Author: Tatu Ylonen <ylo@cs.hut.fi>

Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
                   All rights reserved

Created: Sun Jul 16 04:29:30 1995 ylo

This file contains various auxiliary functions related to multiple
precision integers.

*/

/* RCSID("$Id: mpaux.h,v 1.1 1999/09/26 20:53:36 deraadt Exp $"); */

#ifndef MPAUX_H
#define MPAUX_H

/* Converts a multiple-precision integer into bytes to be stored in the buffer.
   The buffer will contain the value of the integer, msb first. */
void mp_linearize_msb_first(unsigned char *buf, unsigned int len, 
			    MP_INT *value);

/* Extract a multiple-precision integer from buffer.  The value is stored
   in the buffer msb first. */
void mp_unlinearize_msb_first(MP_INT *value, const unsigned char *buf,
			      unsigned int len);

/* Computes a 16-byte session id in the global variable session_id.
   The session id is computed by concatenating the linearized, msb
   first representations of host_key_n, session_key_n, and the cookie. */
void compute_session_id(unsigned char session_id[16],
			unsigned char cookie[8],
			unsigned int host_key_bits,
			MP_INT *host_key_n,
			unsigned int session_key_bits,
			MP_INT *session_key_n);

#endif /* MPAUX_H */