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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 *keyblock)
{
krb5_error_code ret;
size_t keybytes, keylength, concatlen;
unsigned char *concat = NULL, *foldstring = NULL, *foldkeydata = NULL;
krb5_data indata;
krb5_keyblock foldkeyblock;
krb5_key foldkey = NULL;
/* keyblock->length is checked by krb5int_derive_key. */
keybytes = enc->keybytes;
keylength = enc->keylength;
concatlen = string->length + (salt ? salt->length : 0);
concat = k5alloc(concatlen, &ret);
if (ret != 0)
goto cleanup;
foldstring = k5alloc(keybytes, &ret);
if (ret != 0)
goto cleanup;
foldkeydata = k5alloc(keylength, &ret);
if (ret != 0)
goto cleanup;
/* 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);
krb5int_nfold(concatlen*8, concat, keybytes*8, foldstring);
indata.length = keybytes;
indata.data = (char *) foldstring;
foldkeyblock.length = keylength;
foldkeyblock.contents = foldkeydata;
ret = (*enc->make_key)(&indata, &foldkeyblock);
if (ret != 0)
goto cleanup;
ret = krb5_k_create_key(NULL, &foldkeyblock, &foldkey);
if (ret != 0)
goto cleanup;
/* now derive the key from this one */
indata.length = kerberos_len;
indata.data = (char *) kerberos;
ret = krb5int_derive_keyblock(enc, foldkey, keyblock, &indata);
if (ret != 0)
memset(keyblock->contents, 0, keyblock->length);
cleanup:
zapfree(concat, concatlen);
zapfree(foldstring, keybytes);
zapfree(foldkeydata, keylength);
krb5_k_free_key(NULL, foldkey);
return ret;
}
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