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48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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* This file contains various auxiliary functions related to multiple
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* precision integers.
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*
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* As far as I am concerned, the code I have written for this software
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* can be used freely for any purpose. Any derived versions of this
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* software must be clearly marked as such, and if the derived work is
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* incompatible with the protocol description in the RFC file, it must be
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* called by a name other than "ssh" or "Secure Shell".
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*/
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#include "includes.h"
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RCSID("$OpenBSD: mpaux.c,v 1.16 2001/02/08 19:30:52 itojun Exp $");
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RCSID("$FreeBSD$");
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#include <openssl/bn.h>
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#include "getput.h"
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#include "xmalloc.h"
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#include <openssl/md5.h>
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#include "mpaux.h"
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void
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compute_session_id(u_char session_id[16],
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u_char cookie[8],
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BIGNUM* host_key_n,
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BIGNUM* session_key_n)
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{
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u_int host_key_bytes = BN_num_bytes(host_key_n);
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u_int session_key_bytes = BN_num_bytes(session_key_n);
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u_int bytes = host_key_bytes + session_key_bytes;
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u_char *buf = xmalloc(bytes);
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MD5_CTX md;
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BN_bn2bin(host_key_n, buf);
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BN_bn2bin(session_key_n, buf + host_key_bytes);
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MD5_Init(&md);
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MD5_Update(&md, buf, bytes);
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MD5_Update(&md, cookie, 8);
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MD5_Final(session_id, &md);
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memset(buf, 0, bytes);
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xfree(buf);
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}
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