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      1 /*
      2  * COPYRIGHT (c) 2006
      3  * The Regents of the University of Michigan
      4  * ALL RIGHTS RESERVED
      5  *
      6  * Permission is granted to use, copy, create derivative works
      7  * and redistribute this software and such derivative works
      8  * for any purpose, so long as the name of The University of
      9  * Michigan is not used in any advertising or publicity
     10  * pertaining to the use of distribution of this software
     11  * without specific, written prior authorization.  If the
     12  * above copyright notice or any other identification of the
     13  * University of Michigan is included in any copy of any
     14  * portion of this software, then the disclaimer below must
     15  * also be included.
     16  *
     17  * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION
     18  * FROM THE UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY
     19  * PURPOSE, AND WITHOUT WARRANTY BY THE UNIVERSITY OF
     20  * MICHIGAN OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING
     21  * WITHOUT LIMITATION THE IMPLIED WARRANTIES OF
     22  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
     23  * REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE LIABLE
     24  * FOR ANY DAMAGES, INCLUDING SPECIAL, INDIRECT, INCIDENTAL, OR
     25  * CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM ARISING
     26  * OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
     27  * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF
     28  * SUCH DAMAGES.
     29  */
     30 
     31 
     32 /*
     33  * Create a key given random data.  It is assumed that random_key has
     34  * already been initialized and random_key->contents have been allocated
     35  * with the correct length.
     36  */
     37 #include "k5-int.h"
     38 #include "etypes.h"
     39 
     40 krb5_error_code KRB5_CALLCONV
     41 krb5_c_random_to_key(krb5_context context, krb5_enctype enctype,
     42 		     krb5_data *random_data, krb5_keyblock *random_key)
     43 {
     44     int i;
     45     krb5_error_code ret;
     46     const struct krb5_enc_provider *enc;
     47 
     48     if (random_data == NULL || random_key == NULL)
     49 	return(EINVAL);
     50 
     51     if (random_key->contents == NULL)
     52 	return(EINVAL);
     53 
     54     for (i=0; i<krb5_enctypes_length; i++) {
     55 	if (krb5_enctypes_list[i].etype == enctype)
     56 	    break;
     57     }
     58 
     59     if (i == krb5_enctypes_length)
     60 	return(KRB5_BAD_ENCTYPE);
     61 
     62     enc = krb5_enctypes_list[i].enc;
     63 
     64     if (random_key->length != enc->keylength)
     65 	return(KRB5_BAD_KEYSIZE);
     66 
     67     /* Solaris Kerberos */
     68     ret = ((*(enc->make_key))(context, random_data, random_key));
     69 
     70     if (ret) {
     71 	memset(random_key->contents, 0, random_key->length);
     72     }
     73 
     74     return(ret);
     75 }
     76