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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 "crypto_int.h"
#include "des_int.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_des_key_schedule schedule)
{
if (key->keyblock.length != 8)
return KRB5_BAD_KEYSIZE;
if (iov_total_length(data, num_data, FALSE) % 8 != 0)
return KRB5_BAD_MSIZE;
if (ivec != NULL && ivec->length != 8)
return KRB5_BAD_MSIZE;
switch (mit_des_key_sched(key->keyblock.contents, schedule)) {
case -1:
return(KRB5DES_BAD_KEYPAR);
case -2:
return(KRB5DES_WEAK_KEY);
}
return 0;
}
static krb5_error_code
des_encrypt(krb5_key key, const krb5_data *ivec, krb5_crypto_iov *data,
size_t num_data)
{
mit_des_key_schedule schedule;
krb5_error_code err;
err = validate_and_schedule(key, ivec, data, num_data, schedule);
if (err)
return err;
krb5int_des_cbc_encrypt(data, num_data, schedule,
ivec != NULL ? (unsigned char *) ivec->data :
NULL);
zap(schedule, sizeof(schedule));
return 0;
}
static krb5_error_code
des_decrypt(krb5_key key, const krb5_data *ivec, krb5_crypto_iov *data,
size_t num_data)
{
mit_des_key_schedule schedule;
krb5_error_code err;
err = validate_and_schedule(key, ivec, data, num_data, schedule);
if (err)
return err;
krb5int_des_cbc_decrypt(data, num_data, schedule,
ivec != NULL ? (unsigned char *) ivec->data :
NULL);
zap(schedule, sizeof(schedule));
return 0;
}
static krb5_error_code
des_cbc_mac(krb5_key key, const krb5_crypto_iov *data, size_t num_data,
const krb5_data *ivec, krb5_data *output)
{
mit_des_key_schedule schedule;
krb5_error_code err;
err = validate_and_schedule(key, ivec, data, num_data, schedule);
if (err)
return err;
if (output->length != 8)
return KRB5_CRYPTO_INTERNAL;
krb5int_des_cbc_mac(data, num_data, schedule,
ivec != NULL ? (unsigned char *) ivec->data : NULL,
(unsigned char *) output->data);
zap(schedule, sizeof(schedule));
return 0;
}
const struct krb5_enc_provider krb5int_enc_des = {
8,
7, 8,
des_encrypt,
des_decrypt,
des_cbc_mac,
krb5int_des_init_state,
krb5int_default_free_state
};
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