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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* 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 "des_int.h"
#include <aead.h>
#include <rand2key.h>
static krb5_error_code
validate_and_schedule(krb5_key key, const krb5_data *ivec,
const krb5_crypto_iov *data, size_t num_data,
mit_des3_key_schedule *schedule)
{
size_t i, input_length;
for (i = 0, input_length = 0; i < num_data; i++) {
const krb5_crypto_iov *iov = &data[i];
if (ENCRYPT_IOV(iov))
input_length += iov->data.length;
}
if (key->keyblock.length != 24)
return(KRB5_BAD_KEYSIZE);
if ((input_length%8) != 0)
return(KRB5_BAD_MSIZE);
if (ivec && (ivec->length != 8))
return(KRB5_BAD_MSIZE);
switch (mit_des3_key_sched(*(mit_des3_cblock *)key->keyblock.contents,
*schedule)) {
case -1:
return(KRB5DES_BAD_KEYPAR);
case -2:
return(KRB5DES_WEAK_KEY);
}
return 0;
}
static krb5_error_code
k5_des3_encrypt(krb5_key key, const krb5_data *ivec, krb5_crypto_iov *data,
size_t num_data)
{
mit_des3_key_schedule schedule;
krb5_error_code err;
err = validate_and_schedule(key, ivec, data, num_data, &schedule);
if (err)
return err;
/* this has a return value, but the code always returns zero */
krb5int_des3_cbc_encrypt(data, num_data,
schedule[0], schedule[1], schedule[2],
ivec != NULL ? (unsigned char *) ivec->data :
NULL);
zap(schedule, sizeof(schedule));
return(0);
}
static krb5_error_code
k5_des3_decrypt(krb5_key key, const krb5_data *ivec, krb5_crypto_iov *data,
size_t num_data)
{
mit_des3_key_schedule schedule;
krb5_error_code err;
err = validate_and_schedule(key, ivec, data, num_data, &schedule);
if (err)
return err;
/* this has a return value, but the code always returns zero */
krb5int_des3_cbc_decrypt(data, num_data,
schedule[0], schedule[1], schedule[2],
ivec != NULL ? (unsigned char *) ivec->data :
NULL);
zap(schedule, sizeof(schedule));
return 0;
}
const struct krb5_enc_provider krb5int_enc_des3 = {
8,
21, 24,
k5_des3_encrypt,
k5_des3_decrypt,
NULL,
krb5int_des3_make_key,
krb5int_des_init_state,
krb5int_default_free_state
};
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