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      1 /*
      2  * Copyright 1993 by OpenVision Technologies, Inc.
      3  *
      4  * Permission to use, copy, modify, distribute, and sell this software
      5  * and its documentation for any purpose is hereby granted without fee,
      6  * provided that the above copyright notice appears in all copies and
      7  * that both that copyright notice and this permission notice appear in
      8  * supporting documentation, and that the name of OpenVision not be used
      9  * in advertising or publicity pertaining to distribution of the software
     10  * without specific, written prior permission. OpenVision makes no
     11  * representations about the suitability of this software for any
     12  * purpose.  It is provided "as is" without express or implied warranty.
     13  *
     14  * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
     15  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
     16  * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
     17  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
     18  * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
     19  * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
     20  * PERFORMANCE OF THIS SOFTWARE.
     21  */
     22 
     23 #include "gssapiP_krb5.h"
     24 #ifdef HAVE_MEMORY_H
     25 #include <memory.h>
     26 #endif
     27 
     28 static const unsigned char zeros[16] = {0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0};
     29 
     30 krb5_error_code
     31 kg_make_seed(context, key, seed)
     32      krb5_context context;
     33      krb5_keyblock *key;
     34      unsigned char *seed;
     35 {
     36    krb5_error_code code;
     37    krb5_keyblock *tmpkey;
     38    int i;
     39 
     40    code = krb5_copy_keyblock(context, key, &tmpkey);
     41    if (code)
     42       return(code);
     43 
     44    /* reverse the key bytes, as per spec */
     45 
     46    for (i=0; i<tmpkey->length; i++)
     47       tmpkey->contents[i] = key->contents[key->length - 1 - i];
     48 
     49    code = kg_encrypt(context, tmpkey, KG_USAGE_SEAL, NULL, zeros, seed, 16);
     50 
     51    krb5_free_keyblock(context, tmpkey);
     52 
     53    return(code);
     54 }
     55