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 * des_cbc_cksum.c - compute an 8 byte checksum using DES in CBC mode 10 */ 11 #include <des_int.h> 12 13 /* 14 * This routine performs DES cipher-block-chaining checksum operation, 15 * a.k.a. Message Authentication Code. It ALWAYS encrypts from input 16 * to a single 64 bit output MAC checksum. 17 * 18 * The key schedule is passed as an arg, as well as the cleartext or 19 * ciphertext. The cleartext and ciphertext should be in host order. 20 * 21 * NOTE-- the output is ALWAYS 8 bytes long. If not enough space was 22 * provided, your program will get trashed. 23 * 24 * The input is null padded, at the end (highest addr), to an integral 25 * multiple of eight bytes. 26 */ 27 unsigned long 28 mit_des_cbc_cksum(krb5_context context, 29 krb5_octet *in, krb5_octet *out, 30 long length, krb5_keyblock *key, 31 krb5_octet *ivec) 32 { 33 krb5_error_code ret = 0; 34 /* EXPORT DELETE START */ 35 krb5_data input; 36 krb5_data output; 37 krb5_data ivecdata; 38 39 input.data = (char *)in; 40 input.length = length; 41 output.data = (char *)out; 42 output.length = MIT_DES_BLOCK_LENGTH; 43 ivecdata.data = (char *)ivec; 44 ivecdata.length = MIT_DES_BLOCK_LENGTH; 45 46 ret = k5_ef_mac(context, key, &ivecdata, 47 (const krb5_data *)&input, &output); 48 49 /* EXPORT DELETE END */ 50 return (ret); 51 } 52