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Annotation of src/usr.bin/ssh/mpaux.c, Revision 1.7

1.1       deraadt     1: /*
                      2:
                      3: mpaux.c
                      4:
                      5: Author: Tatu Ylonen <ylo@cs.hut.fi>
                      6:
                      7: Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
                      8:                    All rights reserved
                      9:
                     10: Created: Sun Jul 16 04:29:30 1995 ylo
                     11:
                     12: This file contains various auxiliary functions related to multiple
                     13: precision integers.
                     14:
                     15: */
                     16:
                     17: #include "includes.h"
1.7     ! markus     18: RCSID("$Id: mpaux.c,v 1.6 1999/11/15 20:53:24 markus Exp $");
1.1       deraadt    19:
1.2       provos     20: #include <ssl/bn.h>
1.1       deraadt    21: #include "getput.h"
                     22: #include "xmalloc.h"
1.3       deraadt    23:
1.4       deraadt    24: #include <ssl/md5.h>
1.1       deraadt    25:
1.2       provos     26: void
                     27: compute_session_id(unsigned char session_id[16],
                     28:                   unsigned char cookie[8],
1.7     ! markus     29:                   BIGNUM* host_key_n,
        !            30:                   BIGNUM* session_key_n)
1.1       deraadt    31: {
1.7     ! markus     32:        unsigned int host_key_bits = BN_num_bits(host_key_n);
        !            33:        unsigned int session_key_bits = BN_num_bits(session_key_n);
        !            34:        unsigned int bytes = (host_key_bits + 7) / 8 + (session_key_bits + 7) / 8 + 8;
        !            35:        unsigned char *buf = xmalloc(bytes);
        !            36:        MD5_CTX md;
1.6       markus     37:
1.7     ! markus     38:        BN_bn2bin(host_key_n, buf);
        !            39:        BN_bn2bin(session_key_n, buf + (host_key_bits + 7) / 8);
        !            40:        memcpy(buf + (host_key_bits + 7) / 8 + (session_key_bits + 7) / 8, cookie, 8);
        !            41:        MD5_Init(&md);
        !            42:        MD5_Update(&md, buf, bytes);
        !            43:        MD5_Final(session_id, &md);
        !            44:        memset(buf, 0, bytes);
        !            45:        xfree(buf);
1.1       deraadt    46: }