1 #pragma ident "%Z%%M% %I% %E% SMI" 2 /* 3 * Copyright (C) 1998 by the FundsXpress, INC. 4 * 5 * All rights reserved. 6 * 7 * Export of this software from the United States of America may require 8 * a specific license from the United States Government. It is the 9 * responsibility of any person or organization contemplating export to 10 * obtain such a license before exporting. 11 * 12 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and 13 * distribute this software and its documentation for any purpose and 14 * without fee is hereby granted, provided that the above copyright 15 * notice appear in all copies and that both that copyright notice and 16 * this permission notice appear in supporting documentation, and that 17 * the name of FundsXpress. not be used in advertising or publicity pertaining 18 * to distribution of the software without specific, written prior 19 * permission. FundsXpress makes no representations about the suitability of 20 * this software for any purpose. It is provided "as is" without express 21 * or implied warranty. 22 * 23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 25 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 26 */ 27 28 #include <k5-int.h> 29 #include <gssapiP_krb5.h> 30 #include <crc-32.h> 31 #include <hash_provider.h> 32 33 static void 34 k5_crc32_hash_size(size_t *output) 35 { 36 *output = CRC32_CKSUM_LENGTH; 37 } 38 39 static void 40 k5_crc32_block_size(size_t *output) 41 { 42 *output = 1; 43 } 44 45 /* ARGSUSED */ 46 static krb5_error_code 47 k5_crc32_hash(krb5_context context, 48 unsigned int icount, krb5_const krb5_data *input, 49 krb5_data *output) 50 { 51 unsigned long c, cn; 52 int i; 53 54 if (output->length != CRC32_CKSUM_LENGTH) 55 return(KRB5_CRYPTO_INTERNAL); 56 57 c = 0; 58 for (i=0; i<icount; i++) { 59 mit_crc32(input[i].data, input[i].length, &cn); 60 c ^= cn; 61 } 62 63 output->data[0] = c&0xff; 64 output->data[1] = (c>>8)&0xff; 65 output->data[2] = (c>>16)&0xff; 66 output->data[3] = (c>>24)&0xff; 67 68 return(0); 69 } 70 71 const struct krb5_hash_provider krb5_hash_crc32 = { 72 k5_crc32_hash_size, 73 k5_crc32_block_size, 74 k5_crc32_hash 75 }; 76