1 /* 2 * Copyright 2003 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_DLLIMP krb5_error_code KRB5_CALLCONV 38 krb5_c_verify_checksum(context, key, usage, data, cksum, valid) 39 krb5_context context; 40 krb5_const krb5_keyblock *key; 41 krb5_keyusage usage; 42 krb5_const krb5_data *data; 43 krb5_const krb5_checksum *cksum; 44 krb5_boolean *valid; 45 { 46 int i; 47 size_t hashsize; 48 krb5_error_code ret; 49 krb5_data indata; 50 krb5_checksum computed; 51 52 for (i=0; i<krb5_cksumtypes_length; i++) { 53 if (krb5_cksumtypes_list[i].ctype == cksum->checksum_type) 54 break; 55 } 56 57 if (i == krb5_cksumtypes_length) 58 return(KRB5_BAD_ENCTYPE); 59 60 /* if there's actually a verify function, call it */ 61 62 indata.length = cksum->length; 63 indata.data = (char *) cksum->contents; 64 *valid = 0; 65 66 if (krb5_cksumtypes_list[i].keyhash && 67 krb5_cksumtypes_list[i].keyhash->verify) 68 return((*(krb5_cksumtypes_list[i].keyhash->verify))( 69 context, key, usage, 0, data, &indata, valid)); 70 71 /* otherwise, make the checksum again, and compare */ 72 73 if ((ret = krb5_c_checksum_length(context, cksum->checksum_type, &hashsize))) 74 return(ret); 75 76 if (cksum->length != hashsize) 77 return(KRB5_BAD_MSIZE); 78 79 computed.length = hashsize; 80 81 if ((ret = krb5_c_make_checksum(context, cksum->checksum_type, key, usage, 82 data, &computed))) { 83 FREE(computed.contents, computed.length); 84 return(ret); 85 } 86 87 *valid = (memcmp(computed.contents, cksum->contents, hashsize) == 0); 88 89 FREE(computed.contents, computed.length); 90 91 return(0); 92 } 93