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 "crc-32.h" 29 #include "hash_provider.h" 30 31 /* ARGSUSED */ 32 static krb5_error_code 33 k5_crc32_hash(krb5_context context, 34 unsigned int icount, krb5_const krb5_data *input, 35 krb5_data *output) 36 { 37 unsigned long c, cn; 38 int i; 39 40 if (output->length != CRC32_CKSUM_LENGTH) 41 return(KRB5_CRYPTO_INTERNAL); 42 43 c = 0; 44 for (i=0; i<icount; i++) { 45 mit_crc32(input[i].data, input[i].length, &cn); 46 c ^= cn; 47 } 48 49 output->data[0] = c&0xff; 50 output->data[1] = (c>>8)&0xff; 51 output->data[2] = (c>>16)&0xff; 52 output->data[3] = (c>>24)&0xff; 53 54 return(0); 55 } 56 57 const struct krb5_hash_provider krb5int_hash_crc32 = { 58 CRC32_CKSUM_LENGTH, 59 1, 60 k5_crc32_hash 61 }; 62