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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 "k5-int.h"
#include "des_int.h"
#include "enc_provider.h"
#include "aead.h"
static krb5_error_code
k5_des_docrypt(const krb5_keyblock *key, const krb5_data *ivec,
const krb5_data *input, krb5_data *output, int enc)
{
mit_des_key_schedule schedule;
/* key->enctype was checked by the caller */
if (key->length != 8)
return(KRB5_BAD_KEYSIZE);
if ((input->length%8) != 0)
return(KRB5_BAD_MSIZE);
if (ivec && (ivec->length != 8))
return(KRB5_BAD_MSIZE);
if (input->length != output->length)
return(KRB5_BAD_MSIZE);
switch (mit_des_key_sched(key->contents, schedule)) {
case -1:
return(KRB5DES_BAD_KEYPAR);
case -2:
return(KRB5DES_WEAK_KEY);
}
/* this has a return value, but the code always returns zero */
mit_des_cbc_encrypt((krb5_pointer) input->data,
(krb5_pointer) output->data, input->length,
schedule,
(ivec
? (const unsigned char *) ivec->data
: (const unsigned char *) mit_des_zeroblock),
enc);
memset(schedule, 0, sizeof(schedule));
return(0);
}
static krb5_error_code
k5_des_encrypt(const krb5_keyblock *key, const krb5_data *ivec,
const krb5_data *input, krb5_data *output)
{
return(k5_des_docrypt(key, ivec, input, output, 1));
}
static krb5_error_code
k5_des_decrypt(const krb5_keyblock *key, const krb5_data *ivec,
const krb5_data *input, krb5_data *output)
{
return(k5_des_docrypt(key, ivec, input, output, 0));
}
static krb5_error_code
k5_des_make_key(const krb5_data *randombits, krb5_keyblock *key)
{
if (key->length != 8)
return(KRB5_BAD_KEYSIZE);
if (randombits->length != 7)
return(KRB5_CRYPTO_INTERNAL);
key->magic = KV5M_KEYBLOCK;
key->length = 8;
/* take the seven bytes, move them around into the top 7 bits of the
8 key bytes, then compute the parity bits */
memcpy(key->contents, randombits->data, randombits->length);
key->contents[7] = (((key->contents[0]&1)<<1) | ((key->contents[1]&1)<<2) |
((key->contents[2]&1)<<3) | ((key->contents[3]&1)<<4) |
((key->contents[4]&1)<<5) | ((key->contents[5]&1)<<6) |
((key->contents[6]&1)<<7));
mit_des_fixup_key_parity(key->contents);
return(0);
}
static krb5_error_code
k5_des_docrypt_iov(const krb5_keyblock *key, const krb5_data *ivec,
krb5_crypto_iov *data, size_t num_data, int enc)
{
mit_des_key_schedule schedule;
size_t input_length = 0;
unsigned int i;
/* key->enctype was checked by the caller */
if (key->length != 8)
return(KRB5_BAD_KEYSIZE);
for (i = 0; i < num_data; i++) {
const krb5_crypto_iov *iov = &data[i];
if (ENCRYPT_DATA_IOV(iov))
input_length += iov->data.length;
}
if ((input_length % 8) != 0)
return(KRB5_BAD_MSIZE);
if (ivec && (ivec->length != 8))
return(KRB5_BAD_MSIZE);
switch (mit_des_key_sched(key->contents, schedule)) {
case -1:
return(KRB5DES_BAD_KEYPAR);
case -2:
return(KRB5DES_WEAK_KEY);
}
/* this has a return value, but the code always returns zero */
if (enc)
krb5int_des_cbc_encrypt_iov(data, num_data, schedule, ivec ? ivec->data : NULL);
else
krb5int_des_cbc_decrypt_iov(data, num_data, schedule, ivec ? ivec->data : NULL);
memset(schedule, 0, sizeof(schedule));
return(0);
}
static krb5_error_code
k5_des_encrypt_iov(const krb5_keyblock *key,
const krb5_data *ivec,
krb5_crypto_iov *data,
size_t num_data)
{
return k5_des_docrypt_iov(key, ivec, data, num_data, 1);
}
static krb5_error_code
k5_des_decrypt_iov(const krb5_keyblock *key,
const krb5_data *ivec,
krb5_crypto_iov *data,
size_t num_data)
{
return k5_des_docrypt_iov(key, ivec, data, num_data, 0);
}
const struct krb5_enc_provider krb5int_enc_des = {
8,
7, 8,
k5_des_encrypt,
k5_des_decrypt,
k5_des_make_key,
krb5int_des_init_state,
krb5int_default_free_state,
k5_des_encrypt_iov,
k5_des_decrypt_iov
};
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