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/*
* Copyright (C) 1998 by the FundsXpress, INC.
*
* All rights reserved.
*
* Export of this software from the United States of America may require
* a specific license from the United States Government. It is the
* responsibility of any person or organization contemplating export to
* obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of FundsXpress. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. FundsXpress makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include "dk.h"
static const unsigned char kerberos[] = "kerberos";
#define kerberos_len (sizeof(kerberos)-1)
krb5_error_code
krb5int_dk_string_to_key(const struct krb5_enc_provider *enc,
const krb5_data *string, const krb5_data *salt,
const krb5_data *parms, krb5_keyblock *key)
{
krb5_error_code ret;
size_t keybytes, keylength, concatlen;
unsigned char *concat, *foldstring, *foldkeydata;
krb5_data indata;
krb5_keyblock foldkey;
/* key->length is checked by krb5_derive_key */
keybytes = enc->keybytes;
keylength = enc->keylength;
concatlen = string->length+(salt?salt->length:0);
if ((concat = (unsigned char *) malloc(concatlen)) == NULL)
return(ENOMEM);
if ((foldstring = (unsigned char *) malloc(keybytes)) == NULL) {
free(concat);
return(ENOMEM);
}
if ((foldkeydata = (unsigned char *) malloc(keylength)) == NULL) {
free(foldstring);
free(concat);
return(ENOMEM);
}
/* construct input string ( = string + salt), fold it, make_key it */
memcpy(concat, string->data, string->length);
if (salt)
memcpy(concat+string->length, salt->data, salt->length);
krb5_nfold(concatlen*8, concat, keybytes*8, foldstring);
indata.length = keybytes;
indata.data = (char *) foldstring;
foldkey.length = keylength;
foldkey.contents = foldkeydata;
(*(enc->make_key))(&indata, &foldkey);
/* now derive the key from this one */
indata.length = kerberos_len;
indata.data = (char *) kerberos;
if ((ret = krb5_derive_key(enc, &foldkey, key, &indata)))
memset(key->contents, 0, key->length);
/* ret is set correctly by the prior call */
memset(concat, 0, concatlen);
memset(foldstring, 0, keybytes);
memset(foldkeydata, 0, keylength);
free(foldkeydata);
free(foldstring);
free(concat);
return(ret);
}
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