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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"
#include "etypes.h"
#include "dk.h"
krb5_error_code KRB5_CALLCONV
krb5_k_make_checksum(krb5_context context, krb5_cksumtype cksumtype,
krb5_key key, krb5_keyusage usage,
const krb5_data *input, krb5_checksum *cksum)
{
unsigned int i;
const struct krb5_cksumtypes *ctp;
const struct krb5_keytypes *ktp1, *ktp2;
const struct krb5_keyhash_provider *keyhash;
krb5_crypto_iov iov;
krb5_data data;
krb5_octet *trunc;
krb5_error_code ret;
size_t cksumlen;
iov.flags = KRB5_CRYPTO_TYPE_DATA;
iov.data = *input;
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)
cksumlen = ctp->keyhash->hashsize;
else
cksumlen = ctp->hash->hashsize;
cksum->length = cksumlen;
cksum->contents = malloc(cksum->length);
if (cksum->contents == NULL)
return ENOMEM;
data = make_data(cksum->contents, cksum->length);
if (ctp->keyhash) {
/* check if key is compatible */
if (ctp->keyed_etype) {
ktp1 = find_enctype(ctp->keyed_etype);
ktp2 = key ? find_enctype(key->keyblock.enctype) : NULL;
if (ktp1 == NULL || ktp2 == NULL || ktp1->enc != ktp2->enc) {
ret = KRB5_BAD_ENCTYPE;
goto cleanup;
}
}
keyhash = ctp->keyhash;
if (keyhash->hash == NULL) {
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 (ctp->flags & KRB5_CKSUMFLAG_DERIVE) {
ret = krb5int_dk_make_checksum(ctp->hash, key, usage, &iov, 1, &data);
} else {
/* No key is used. */
ret = ctp->hash->hash(&iov, 1, &data);
}
if (!ret) {
cksum->magic = KV5M_CHECKSUM;
cksum->checksum_type = cksumtype;
if (ctp->trunc_size) {
cksum->length = ctp->trunc_size;
trunc = realloc(cksum->contents, cksum->length);
if (trunc)
cksum->contents = trunc;
}
}
cleanup:
if (ret) {
zapfree(cksum->contents, cksum->length);
cksum->contents = NULL;
}
return ret;
}
krb5_error_code KRB5_CALLCONV
krb5_c_make_checksum(krb5_context context, krb5_cksumtype cksumtype,
const krb5_keyblock *keyblock, krb5_keyusage usage,
const krb5_data *input, krb5_checksum *cksum)
{
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_make_checksum(context, cksumtype, key, usage, input, cksum);
krb5_k_free_key(context, key);
return ret;
}
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