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8efc0c15 | 1 | /* |
6ae2364d | 2 | * |
5260325f | 3 | * mpaux.c |
6ae2364d | 4 | * |
5260325f | 5 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
6ae2364d | 6 | * |
5260325f | 7 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
8 | * All rights reserved | |
6ae2364d | 9 | * |
5260325f | 10 | * Created: Sun Jul 16 04:29:30 1995 ylo |
6ae2364d | 11 | * |
5260325f | 12 | * This file contains various auxiliary functions related to multiple |
13 | * precision integers. | |
6ae2364d | 14 | * |
8efc0c15 | 15 | */ |
16 | ||
17 | #include "includes.h" | |
74fc9186 | 18 | RCSID("$OpenBSD: mpaux.c,v 1.13 2000/06/20 01:39:42 markus Exp $"); |
8efc0c15 | 19 | |
35484284 | 20 | #include <openssl/bn.h> |
5260325f | 21 | #include "getput.h" |
22 | #include "xmalloc.h" | |
23 | ||
5881cd60 | 24 | #include <openssl/md5.h> |
5881cd60 | 25 | |
8efc0c15 | 26 | void |
27 | compute_session_id(unsigned char session_id[16], | |
7368a6c8 | 28 | unsigned char cookie[8], |
29 | BIGNUM* host_key_n, | |
30 | BIGNUM* session_key_n) | |
8efc0c15 | 31 | { |
95f1eccc | 32 | unsigned int host_key_bytes = BN_num_bytes(host_key_n); |
33 | unsigned int session_key_bytes = BN_num_bytes(session_key_n); | |
34 | unsigned int bytes = host_key_bytes + session_key_bytes; | |
5260325f | 35 | unsigned char *buf = xmalloc(bytes); |
36 | MD5_CTX md; | |
37 | ||
38 | BN_bn2bin(host_key_n, buf); | |
95f1eccc | 39 | BN_bn2bin(session_key_n, buf + host_key_bytes); |
5260325f | 40 | MD5_Init(&md); |
41 | MD5_Update(&md, buf, bytes); | |
95f1eccc | 42 | MD5_Update(&md, cookie, 8); |
5260325f | 43 | MD5_Final(session_id, &md); |
44 | memset(buf, 0, bytes); | |
45 | xfree(buf); | |
8efc0c15 | 46 | } |