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Annotation of src/usr.bin/ssh/mpaux.c, Revision 1.2

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"
                     18: RCSID("$Id: mpaux.c,v 1.3 1999/05/04 11:58:51 bg Exp $");
                     19:
1.2     ! provos     20: #include <ssl/bn.h>
1.1       deraadt    21: #include "getput.h"
                     22: #include "xmalloc.h"
                     23: #include "ssh_md5.h"
                     24:
1.2     ! provos     25: void
        !            26: compute_session_id(unsigned char session_id[16],
        !            27:                   unsigned char cookie[8],
        !            28:                   unsigned int host_key_bits,
        !            29:                   BIGNUM *host_key_n,
        !            30:                   unsigned int session_key_bits,
        !            31:                   BIGNUM *session_key_n)
1.1       deraadt    32: {
                     33:   unsigned int bytes = (host_key_bits + 7) / 8 + (session_key_bits + 7) / 8 + 8;
                     34:   unsigned char *buf = xmalloc(bytes);
                     35:   struct MD5Context md;
                     36:
1.2     ! provos     37:   BN_bn2bin(host_key_n, buf);
        !            38:   BN_bn2bin(session_key_n, buf + (host_key_bits + 7 ) / 8);
1.1       deraadt    39:   memcpy(buf + (host_key_bits + 7) / 8 + (session_key_bits + 7) / 8,
                     40:         cookie, 8);
                     41:   MD5Init(&md);
                     42:   MD5Update(&md, buf, bytes);
                     43:   MD5Final(session_id, &md);
                     44:   xfree(buf);
                     45: }