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 * Copyright (C) 1998 by the FundsXpress, INC. 10 * 11 * All rights reserved. 12 * 13 * Export of this software from the United States of America may require 14 * a specific license from the United States Government. It is the 15 * responsibility of any person or organization contemplating export to 16 * obtain such a license before exporting. 17 * 18 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and 19 * distribute this software and its documentation for any purpose and 20 * without fee is hereby granted, provided that the above copyright 21 * notice appear in all copies and that both that copyright notice and 22 * this permission notice appear in supporting documentation, and that 23 * the name of FundsXpress. not be used in advertising or publicity pertaining 24 * to distribution of the software without specific, written prior 25 * permission. FundsXpress makes no representations about the suitability of 26 * this software for any purpose. It is provided "as is" without express 27 * or implied warranty. 28 * 29 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 30 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 31 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 32 */ 33 34 #include <dk.h> 35 36 static unsigned char kerberos[] = "kerberos"; 37 #define kerberos_len (sizeof(kerberos)-1) 38 39 krb5_error_code 40 krb5_dk_string_to_key( 41 krb5_context context, 42 krb5_const struct krb5_enc_provider *enc, 43 krb5_const krb5_data *string, 44 krb5_const krb5_data *salt, 45 krb5_const krb5_data *parms, 46 krb5_keyblock *key) 47 { 48 krb5_error_code ret; 49 size_t keybytes, keylength, concatlen; 50 unsigned char *concat, *foldstring, *foldkeydata; 51 krb5_data indata; 52 krb5_keyblock foldkey; 53 54 /* key->length is checked by krb5_derive_key */ 55 56 keybytes = enc->keybytes; 57 keylength = enc->keylength; 58 59 concatlen = string->length+(salt?salt->length:0); 60 61 if ((concat = (unsigned char *) malloc(concatlen)) == NULL) 62 return(ENOMEM); 63 if ((foldstring = (unsigned char *) malloc(keybytes)) == NULL) { 64 free(concat); 65 return(ENOMEM); 66 } 67 if ((foldkeydata = (unsigned char *) malloc(keylength)) == NULL) { 68 free(foldstring); 69 free(concat); 70 return(ENOMEM); 71 } 72 73 /* construct input string ( = string + salt), fold it, make_key it */ 74 75 (void) memcpy(concat, string->data, string->length); 76 if (salt) 77 (void) memcpy(concat+string->length, salt->data, salt->length); 78 79 krb5_nfold(concatlen*8, concat, keybytes*8, foldstring); 80 81 indata.length = keybytes; 82 indata.data = (char *)foldstring; 83 84 memset(&foldkey, 0, sizeof (krb5_keyblock)); 85 foldkey.enctype = key->enctype; 86 foldkey.length = keylength; 87 foldkey.contents = foldkeydata; 88 89 (*(enc->make_key))(context, &indata, &foldkey); 90 91 /* now derive the key from this one */ 92 93 indata.length = kerberos_len; 94 indata.data = (char *)kerberos; 95 96 if ((ret = krb5_derive_key(context, enc, &foldkey, key, &indata))) 97 (void) memset(key->contents, 0, key->length); 98 99 /* ret is set correctly by the prior call */ 100 101 (void) memset(concat, 0, concatlen); 102 (void) memset(foldstring, 0, keybytes); 103 (void) memset(foldkeydata, 0, keylength); 104 105 free(foldkeydata); 106 free(foldstring); 107 free(concat); 108 109 return(ret); 110 } 111