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/* lib/crypto/nss/enc_provider/rc4.c
*
* #include STD_DISCLAIMER
*
* Copyright (C) 2009 by the Massachusetts Institute of Technology.
* Copyright (C) 2010 Red Hat, 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 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.
*/
/* arcfour.c
*
* Copyright (c) 2000 by Computer Science Laboratory,
* Rensselaer Polytechnic Institute
*
* #include STD_DISCLAIMER
*/
#include "k5-int.h"
#include <aead.h>
#include <rand2key.h>
#include "nss_gen.h"
#define RC4_KEY_SIZE 16
#define RC4_BLOCK_SIZE 1
/* In-place IOV crypto */
static krb5_error_code
k5_arcfour_encrypt_iov(krb5_key key,
const krb5_data *state,
krb5_crypto_iov *data,
size_t num_data)
{
int ret;
ret = k5_nss_gen_import(key, CKM_RC4, CKA_ENCRYPT);
if (ret != 0) {
return ret;
}
return k5_nss_gen_stream_iov(key, state, CKM_RC4, CKA_ENCRYPT,
data, num_data);
}
/* In-place IOV crypto */
static krb5_error_code
k5_arcfour_decrypt_iov(krb5_key key,
const krb5_data *state,
krb5_crypto_iov *data,
size_t num_data)
{
int ret;
ret = k5_nss_gen_import(key, CKM_RC4, CKA_DECRYPT);
if (ret != 0) {
return ret;
}
return k5_nss_gen_stream_iov(key, state, CKM_RC4, CKA_DECRYPT,
data, num_data);
}
static krb5_error_code
k5_arcfour_free_state ( krb5_data *state)
{
return k5_nss_stream_free_state(state);
}
static krb5_error_code
k5_arcfour_init_state (const krb5_keyblock *key,
krb5_keyusage keyusage, krb5_data *new_state)
{
/* key can't quite be used here. see comment in k5_arcfour_init_state */
return k5_nss_stream_init_state(new_state);
}
const struct krb5_enc_provider krb5int_enc_arcfour = {
/* This seems to work... although I am not sure what the
implications are in other places in the kerberos library */
RC4_BLOCK_SIZE,
/* Keysize is arbitrary in arcfour, but the constraints of the
system, and to attempt to work with the MSFT system forces us
to 16byte/128bit. Since there is no parity in the key, the
byte and length are the same. */
RC4_KEY_SIZE, RC4_KEY_SIZE,
k5_arcfour_encrypt_iov,
k5_arcfour_decrypt_iov,
NULL,
krb5int_arcfour_make_key,
k5_arcfour_init_state,
k5_arcfour_free_state,
k5_nss_gen_cleanup
};
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