1 /* 2 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 3 * Use is subject to license terms. 4 */ 5 6 7 /* 8 * Copyright (C) 1998 by the FundsXpress, INC. 9 * 10 * All rights reserved. 11 * 12 * Export of this software from the United States of America may require 13 * a specific license from the United States Government. It is the 14 * responsibility of any person or organization contemplating export to 15 * obtain such a license before exporting. 16 * 17 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and 18 * distribute this software and its documentation for any purpose and 19 * without fee is hereby granted, provided that the above copyright 20 * notice appear in all copies and that both that copyright notice and 21 * this permission notice appear in supporting documentation, and that 22 * the name of FundsXpress. not be used in advertising or publicity pertaining 23 * to distribution of the software without specific, written prior 24 * permission. FundsXpress makes no representations about the suitability of 25 * this software for any purpose. It is provided "as is" without express 26 * or implied warranty. 27 * 28 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 29 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 30 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 31 */ 32 33 #include "k5-int.h" 34 #include "cksumtypes.h" 35 36 krb5_error_code KRB5_CALLCONV 37 krb5_c_verify_checksum(krb5_context context, const krb5_keyblock *key, 38 krb5_keyusage usage, const krb5_data *data, 39 const krb5_checksum *cksum, krb5_boolean *valid) 40 { 41 int i; 42 size_t hashsize; 43 krb5_error_code ret; 44 krb5_data indata; 45 krb5_checksum computed; 46 47 for (i=0; i<krb5_cksumtypes_length; i++) { 48 if (krb5_cksumtypes_list[i].ctype == cksum->checksum_type) 49 break; 50 } 51 52 if (i == krb5_cksumtypes_length) 53 return(KRB5_BAD_ENCTYPE); 54 55 /* if there's actually a verify function, call it */ 56 57 indata.length = cksum->length; 58 indata.data = (char *) cksum->contents; 59 *valid = 0; 60 61 if (krb5_cksumtypes_list[i].keyhash && 62 krb5_cksumtypes_list[i].keyhash->verify) 63 return((*(krb5_cksumtypes_list[i].keyhash->verify))( 64 context, key, usage, 0, data, &indata, valid)); 65 66 /* otherwise, make the checksum again, and compare */ 67 68 if ((ret = krb5_c_checksum_length(context, cksum->checksum_type, &hashsize))) 69 return(ret); 70 71 if (cksum->length != hashsize) 72 return(KRB5_BAD_MSIZE); 73 74 computed.length = hashsize; 75 76 if ((ret = krb5_c_make_checksum(context, cksum->checksum_type, key, usage, 77 data, &computed))) { 78 FREE(computed.contents, computed.length); 79 return(ret); 80 } 81 82 *valid = (memcmp(computed.contents, cksum->contents, hashsize) == 0); 83 84 FREE(computed.contents, computed.length); 85 86 return(0); 87 } 88