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/*
* lib/crypto/make_checksum_iov.c
*
* Copyright 2008 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.
*/
#include "k5-int.h"
#include "cksumtypes.h"
#include "aead.h"
krb5_error_code KRB5_CALLCONV
krb5_k_make_checksum_iov(krb5_context context,
krb5_cksumtype cksumtype,
krb5_key key,
krb5_keyusage usage,
krb5_crypto_iov *data,
size_t num_data)
{
unsigned int i;
size_t cksumlen;
krb5_error_code ret;
krb5_data cksum_data;
krb5_crypto_iov *checksum;
const struct krb5_cksumtypes *ctp;
for (i = 0; i < krb5int_cksumtypes_length; i++) {
if (krb5int_cksumtypes_list[i].ctype == cksumtype)
break;
}
if (i == krb5int_cksumtypes_length)
return KRB5_BAD_ENCTYPE;
ctp = &krb5int_cksumtypes_list[i];
if (ctp->keyhash != NULL)
cksum_data.length = ctp->keyhash->hashsize;
else
cksum_data.length = ctp->hash->hashsize;
if (ctp->trunc_size != 0)
cksumlen = ctp->trunc_size;
else
cksumlen = cksum_data.length;
checksum = krb5int_c_locate_iov(data, num_data, KRB5_CRYPTO_TYPE_CHECKSUM);
if (checksum == NULL || checksum->data.length < cksumlen)
return(KRB5_BAD_MSIZE);
cksum_data.data = malloc(cksum_data.length);
if (cksum_data.data == NULL)
return(ENOMEM);
ret = krb5int_c_make_checksum_iov(&krb5int_cksumtypes_list[i],
key, usage, data, num_data,
&cksum_data);
if (ret == 0) {
memcpy(checksum->data.data, cksum_data.data, cksumlen);
checksum->data.length = cksumlen;
}
free(cksum_data.data);
return(ret);
}
krb5_error_code KRB5_CALLCONV
krb5_c_make_checksum_iov(krb5_context context,
krb5_cksumtype cksumtype,
const krb5_keyblock *keyblock,
krb5_keyusage usage,
krb5_crypto_iov *data,
size_t num_data)
{
krb5_key key;
krb5_error_code ret;
ret = krb5_k_create_key(context, keyblock, &key);
if (ret != 0)
return ret;
ret = krb5_k_make_checksum_iov(context, cksumtype, key, usage,
data, num_data);
krb5_k_free_key(context, key);
return ret;
}
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