1 /* 2 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 3 * Use is subject to license terms. 4 */ 5 6 7 /* 8 * des_cbc_cksum.c - compute an 8 byte checksum using DES in CBC mode 9 */ 10 #include "des_int.h" 11 12 /* 13 * This routine performs DES cipher-block-chaining checksum operation, 14 * a.k.a. Message Authentication Code. It ALWAYS encrypts from input 15 * to a single 64 bit output MAC checksum. 16 * 17 * The key schedule is passed as an arg, as well as the cleartext or 18 * ciphertext. The cleartext and ciphertext should be in host order. 19 * 20 * NOTE-- the output is ALWAYS 8 bytes long. If not enough space was 21 * provided, your program will get trashed. 22 * 23 * The input is null padded, at the end (highest addr), to an integral 24 * multiple of eight bytes. 25 */ 26 unsigned long 27 mit_des_cbc_cksum(krb5_context context, 28 const krb5_octet *in, krb5_octet *out, 29 unsigned long length, krb5_keyblock *key, 30 const krb5_octet *ivec) 31 { 32 krb5_error_code ret = 0; 33 /* EXPORT DELETE START */ 34 krb5_data input; 35 krb5_data output; 36 krb5_data ivecdata; 37 38 input.data = (char *)in; 39 input.length = length; 40 output.data = (char *)out; 41 output.length = MIT_DES_BLOCK_LENGTH; 42 ivecdata.data = (char *)ivec; 43 ivecdata.length = MIT_DES_BLOCK_LENGTH; 44 45 ret = k5_ef_mac(context, key, &ivecdata, 46 (const krb5_data *)&input, &output); 47 48 /* EXPORT DELETE END */ 49 return (ret); 50 } 51