usr/src/lib/gss_mechs/mech_krb5/crypto/keylengths.c

   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 #include "k5-int.h"
  33 #include "etypes.h"
  34
  35 /*
  36  * keybytes is the number of bytes required as input to make a key,
  37  * keylength is the length of the final key in bytes
  38  */
  39 krb5_error_code KRB5_CALLCONV
  40 krb5_c_keylengths(krb5_context context, krb5_enctype enctype,
  41                   size_t *keybytes, size_t *keylength)
  42 {
  43     int i;
  44
  45     if (keybytes == NULL && keylength == NULL)
  46         return(EINVAL);
  47
  48     for (i=0; i<krb5_enctypes_length; i++) {
  49         if (krb5_enctypes_list[i].etype == enctype)
  50             break;
  51     }
  52
  53     if (i == krb5_enctypes_length)
  54         return(KRB5_BAD_ENCTYPE);
  55
  56     if (keybytes)
  57         *keybytes = krb5_enctypes_list[i].enc->keybytes;
  58     if (keylength)
  59         *keylength = krb5_enctypes_list[i].enc->keylength;
  60
  61     return(0);
  62 }