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
krb5_c_keylengths(krb5_context context,krb5_enctype enctype,size_t * keybytes,size_t * keylength)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 }
63