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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 "cksumtypes.h"
krb5_error_code KRB5_CALLCONV
krb5_k_verify_checksum(krb5_context context, krb5_key key,
krb5_keyusage usage, const krb5_data *data,
const krb5_checksum *cksum, krb5_boolean *valid)
{
const struct krb5_cksumtypes *ctp;
krb5_crypto_iov iov;
krb5_error_code ret;
krb5_data cksum_data;
krb5_checksum computed;
iov.flags = KRB5_CRYPTO_TYPE_DATA;
iov.data = *data;
ctp = find_cksumtype(cksum->checksum_type);
if (ctp == NULL)
return KRB5_BAD_ENCTYPE;
ret = verify_key(ctp, key);
if (ret != 0)
return ret;
/* If there's actually a verify function, call it. */
cksum_data = make_data(cksum->contents, cksum->length);
if (ctp->verify != NULL)
return ctp->verify(ctp, key, usage, &iov, 1, &cksum_data, valid);
/* Otherwise, make the checksum again, and compare. */
if (cksum->length != ctp->output_size)
return KRB5_BAD_MSIZE;
ret = krb5_k_make_checksum(context, cksum->checksum_type, key, usage,
data, &computed);
if (ret)
return ret;
*valid = (memcmp(computed.contents, cksum->contents,
ctp->output_size) == 0);
free(computed.contents);
return 0;
}
krb5_error_code KRB5_CALLCONV
krb5_c_verify_checksum(krb5_context context, const krb5_keyblock *keyblock,
krb5_keyusage usage, const krb5_data *data,
const krb5_checksum *cksum, krb5_boolean *valid)
{
krb5_key key = NULL;
krb5_error_code ret;
if (keyblock != NULL) {
ret = krb5_k_create_key(context, keyblock, &key);
if (ret != 0)
return ret;
}
ret = krb5_k_verify_checksum(context, key, usage, data, cksum, valid);
krb5_k_free_key(context, key);
return ret;
}
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