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      1 /*
      2  * Copyright (C) 1998 by the FundsXpress, INC.
      3  *
      4  * All rights reserved.
      5  *
      6  * Export of this software from the United States of America may require
      7  * a specific license from the United States Government.  It is the
      8  * responsibility of any person or organization contemplating export to
      9  * obtain such a license before exporting.
     10  *
     11  * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
     12  * distribute this software and its documentation for any purpose and
     13  * without fee is hereby granted, provided that the above copyright
     14  * notice appear in all copies and that both that copyright notice and
     15  * this permission notice appear in supporting documentation, and that
     16  * the name of FundsXpress. not be used in advertising or publicity pertaining
     17  * to distribution of the software without specific, written prior
     18  * permission.  FundsXpress makes no representations about the suitability of
     19  * this software for any purpose.  It is provided "as is" without express
     20  * or implied warranty.
     21  *
     22  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
     23  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
     24  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
     25  */
     26 
     27 #include "k5-int.h"
     28 #include "etypes.h"
     29 #include "cksumtypes.h"
     30 
     31 static int etype_match(krb5_enctype e1, krb5_enctype e2)
     32 {
     33     int i1, i2;
     34 
     35     for (i1=0; i1<krb5_enctypes_length; i1++)
     36 	if (krb5_enctypes_list[i1].etype == e1)
     37 	    break;
     38 
     39     for (i2=0; i2<krb5_enctypes_length; i2++)
     40 	if (krb5_enctypes_list[i2].etype == e2)
     41 	    break;
     42 
     43     return((i1 < krb5_enctypes_length) &&
     44 	   (i2 < krb5_enctypes_length) &&
     45 	   (krb5_enctypes_list[i1].enc == krb5_enctypes_list[i2].enc));
     46 }
     47 
     48 /*ARGSUSED*/
     49 krb5_error_code KRB5_CALLCONV
     50 krb5_c_keyed_checksum_types(krb5_context context, krb5_enctype enctype,
     51 			    unsigned int *count, krb5_cksumtype **cksumtypes)
     52 {
     53     unsigned int i, c;
     54 
     55     c = 0;
     56     for (i=0; i<krb5_cksumtypes_length; i++) {
     57 	if ((krb5_cksumtypes_list[i].keyhash &&
     58 	     etype_match(krb5_cksumtypes_list[i].keyed_etype, enctype)) ||
     59 	    (krb5_cksumtypes_list[i].flags & KRB5_CKSUMFLAG_DERIVE)) {
     60 	    c++;
     61 	}
     62     }
     63 
     64     *count = c;
     65 
     66     if ((*cksumtypes = (krb5_cksumtype *) malloc(c*sizeof(krb5_cksumtype)))
     67 	== NULL)
     68 	return(ENOMEM);
     69 
     70     c = 0;
     71     for (i=0; i<krb5_cksumtypes_length; i++) {
     72 	if ((krb5_cksumtypes_list[i].keyhash &&
     73 	     etype_match(krb5_cksumtypes_list[i].keyed_etype, enctype)) ||
     74 	    (krb5_cksumtypes_list[i].flags & KRB5_CKSUMFLAG_DERIVE)) {
     75 	    (*cksumtypes)[c] = krb5_cksumtypes_list[i].ctype;
     76 	    c++;
     77 	}
     78     }
     79 
     80     return(0);
     81 }
     82 
     83 /*ARGSUSED*/
     84 void KRB5_CALLCONV
     85 krb5_free_cksumtypes(krb5_context context, krb5_cksumtype *val)
     86 {
     87     if (val)
     88 	krb5_xfree(val);
     89     return;
     90 }
     91 
     92