keylengths.c revision 7934:6aeeafc994de 
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 */
39krb5_error_code KRB5_CALLCONV
40krb5_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}
63