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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* lib/kdb/decrypt_key.c */
/*
* Copyright 1990,1991 by the Massachusetts Institute of Technology.
* 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 M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*/
/*
* 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 "k5-int.h"
#include "kdb.h"
/*
* Decrypt a key from storage in the database. "eblock" is used
* to decrypt the key in "in" into "out"; the storage pointed to by "out"
* is allocated before use.
*/
krb5_error_code
krb5_dbe_def_decrypt_key_data( krb5_context context,
const krb5_keyblock * mkey,
const krb5_key_data * key_data,
krb5_keyblock * dbkey,
krb5_keysalt * keysalt)
{
krb5_error_code retval = 0;
krb5_int16 tmplen;
krb5_octet * ptr;
krb5_enc_data cipher;
krb5_data plain;
if (!mkey)
return KRB5_KDB_BADSTORED_MKEY;
ptr = key_data->key_data_contents[0];
if (ptr) {
krb5_kdb_decode_int16(ptr, tmplen);
ptr += 2;
if (tmplen < 0)
return EINVAL;
cipher.enctype = ENCTYPE_UNKNOWN;
cipher.ciphertext.length = key_data->key_data_length[0]-2;
cipher.ciphertext.data = (char *) ptr;
plain.length = key_data->key_data_length[0]-2;
if ((plain.data = malloc(plain.length)) == NULL)
return(ENOMEM);
if ((retval = krb5_c_decrypt(context, mkey, 0 /* XXX */, 0,
&cipher, &plain))) {
free(plain.data);
return retval;
}
/* tmplen is the true length of the key. plain.data is the
plaintext data length, but it may be padded, since the
old-style etypes didn't store the real length. I can check
to make sure that there are enough bytes, but I can't do
any better than that. */
if ((unsigned int) tmplen > plain.length) {
free(plain.data);
return(KRB5_CRYPTO_INTERNAL);
}
dbkey->magic = KV5M_KEYBLOCK;
dbkey->enctype = key_data->key_data_type[0];
dbkey->length = tmplen;
dbkey->contents = (krb5_octet *) plain.data;
}
/* Decode salt data */
if (keysalt) {
if (key_data->key_data_ver == 2) {
keysalt->type = key_data->key_data_type[1];
if ((keysalt->data.length = key_data->key_data_length[1])) {
if (!(keysalt->data.data=(char *)malloc(keysalt->data.length))){
if (key_data->key_data_contents[0]) {
free(dbkey->contents);
dbkey->contents = 0;
dbkey->length = 0;
}
return ENOMEM;
}
memcpy(keysalt->data.data, key_data->key_data_contents[1],
(size_t) keysalt->data.length);
} else
keysalt->data.data = (char *) NULL;
} else {
keysalt->type = KRB5_KDB_SALTTYPE_NORMAL;
keysalt->data.data = (char *) NULL;
keysalt->data.length = 0;
}
}
return retval;
}
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