1 /* 2 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 3 * Use is subject to license terms. 4 */ 5 6 #pragma ident "%Z%%M% %I% %E% SMI" 7 8 /* 9 * Copyright (C) 1998 by the FundsXpress, INC. 10 * 11 * All rights reserved. 12 * 13 * Export of this software from the United States of America may require 14 * a specific license from the United States Government. It is the 15 * responsibility of any person or organization contemplating export to 16 * obtain such a license before exporting. 17 * 18 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and 19 * distribute this software and its documentation for any purpose and 20 * without fee is hereby granted, provided that the above copyright 21 * notice appear in all copies and that both that copyright notice and 22 * this permission notice appear in supporting documentation, and that 23 * the name of FundsXpress. not be used in advertising or publicity pertaining 24 * to distribution of the software without specific, written prior 25 * permission. FundsXpress makes no representations about the suitability of 26 * this software for any purpose. It is provided "as is" without express 27 * or implied warranty. 28 * 29 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 30 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 31 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 32 */ 33 34 #include <k5-int.h> 35 #include <cksumtypes.h> 36 37 krb5_error_code KRB5_CALLCONV 38 krb5_c_verify_checksum(krb5_context context, const krb5_keyblock *key, 39 krb5_keyusage usage, const krb5_data *data, 40 const krb5_checksum *cksum, krb5_boolean *valid) 41 { 42 int i; 43 size_t hashsize; 44 krb5_error_code ret; 45 krb5_data indata; 46 krb5_checksum computed; 47 48 for (i=0; i<krb5_cksumtypes_length; i++) { 49 if (krb5_cksumtypes_list[i].ctype == cksum->checksum_type) 50 break; 51 } 52 53 if (i == krb5_cksumtypes_length) 54 return(KRB5_BAD_ENCTYPE); 55 56 /* if there's actually a verify function, call it */ 57 58 indata.length = cksum->length; 59 indata.data = (char *) cksum->contents; 60 *valid = 0; 61 62 if (krb5_cksumtypes_list[i].keyhash && 63 krb5_cksumtypes_list[i].keyhash->verify) 64 return((*(krb5_cksumtypes_list[i].keyhash->verify))( 65 context, key, usage, 0, data, &indata, valid)); 66 67 /* otherwise, make the checksum again, and compare */ 68 69 if ((ret = krb5_c_checksum_length(context, cksum->checksum_type, &hashsize))) 70 return(ret); 71 72 if (cksum->length != hashsize) 73 return(KRB5_BAD_MSIZE); 74 75 computed.length = hashsize; 76 77 if ((ret = krb5_c_make_checksum(context, cksum->checksum_type, key, usage, 78 data, &computed))) { 79 FREE(computed.contents, computed.length); 80 return(ret); 81 } 82 83 *valid = (memcmp(computed.contents, cksum->contents, hashsize) == 0); 84 85 FREE(computed.contents, computed.length); 86 87 return(0); 88 } 89