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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 "cksumtypes.h"
#include "etypes.h"
#include "dk.h"
krb5_error_code KRB5_CALLCONV
krb5_c_make_checksum(krb5_context context, krb5_cksumtype cksumtype,
const krb5_keyblock *key, krb5_keyusage usage,
const krb5_data *input, krb5_checksum *cksum)
{
unsigned int i;
int e1, e2;
krb5_data data;
krb5_error_code ret;
size_t cksumlen;
for (i=0; i<krb5_cksumtypes_length; i++) {
if (krb5_cksumtypes_list[i].ctype == cksumtype)
break;
}
if (i == krb5_cksumtypes_length)
return(KRB5_BAD_ENCTYPE);
if (krb5_cksumtypes_list[i].keyhash)
cksumlen = krb5_cksumtypes_list[i].keyhash->hashsize;
else
cksumlen = krb5_cksumtypes_list[i].hash->hashsize;
cksum->length = cksumlen;
if ((cksum->contents = (krb5_octet *) malloc(cksum->length)) == NULL)
return(ENOMEM);
data.length = cksum->length;
data.data = (char *) cksum->contents;
if (krb5_cksumtypes_list[i].keyhash) {
/* check if key is compatible */
const struct krb5_keyhash_provider *keyhash;
keyhash = krb5_cksumtypes_list[i].keyhash;
if (krb5_cksumtypes_list[i].keyed_etype) {
for (e1=0; e1<krb5_enctypes_length; e1++)
if (krb5_enctypes_list[e1].etype ==
krb5_cksumtypes_list[i].keyed_etype)
break;
for (e2=0; e2<krb5_enctypes_length; e2++)
if (krb5_enctypes_list[e2].etype == key->enctype)
break;
if ((e1 == krb5_enctypes_length) ||
(e2 == krb5_enctypes_length) ||
(krb5_enctypes_list[e1].enc != krb5_enctypes_list[e2].enc)) {
ret = KRB5_BAD_ENCTYPE;
goto cleanup;
}
}
if (keyhash->hash == NULL) {
krb5_crypto_iov iov[1];
iov[0].flags = KRB5_CRYPTO_TYPE_DATA;
iov[0].data = *input;
assert(keyhash->hash_iov != NULL);
ret = (*keyhash->hash_iov)(key, usage, 0, iov, 1, &data);
} else {
ret = (*keyhash->hash)(key, usage, 0, input, &data);
}
} else if (krb5_cksumtypes_list[i].flags & KRB5_CKSUMFLAG_DERIVE) {
ret = krb5_dk_make_checksum(krb5_cksumtypes_list[i].hash,
key, usage, input, &data);
} else {
/* no key is used */
ret = (*(krb5_cksumtypes_list[i].hash->hash))(1, input, &data);
}
if (!ret) {
cksum->magic = KV5M_CHECKSUM;
cksum->checksum_type = cksumtype;
if (krb5_cksumtypes_list[i].trunc_size) {
krb5_octet *trunc;
cksum->length = krb5_cksumtypes_list[i].trunc_size;
trunc = (krb5_octet *) realloc(cksum->contents, cksum->length);
if (trunc)
cksum->contents = trunc;
}
}
cleanup:
if (ret) {
memset(cksum->contents, 0, cksum->length);
free(cksum->contents);
cksum->contents = NULL;
}
return(ret);
}
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