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/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* 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)
{
int i, e1, e2;
krb5_data data;
krb5_error_code ret = 0;
size_t cksumlen;
KRB5_LOG0(KRB5_INFO, "krb5_c_make_checksum() start.");
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;
#ifdef _KERNEL
context->kef_cksum_mt = krb5_cksumtypes_list[i].kef_cksum_mt;
#endif
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 */
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;
/*
* Solaris Kerberos: The actual key encryption type could be
* arbitrary, so the checksum enc type doesn't need to be the same.
*/
if ((e1 == krb5_enctypes_length) || (e2 == krb5_enctypes_length)) {
ret = KRB5_BAD_ENCTYPE;
goto cleanup;
}
}
#ifdef _KERNEL
context->kef_cipher_mt = krb5_enctypes_list[e1].kef_cipher_mt;
context->kef_hash_mt = krb5_enctypes_list[e1].kef_hash_mt;
if (key->kef_key.ck_data == NULL) {
if ((ret = init_key_kef(context->kef_cipher_mt,
(krb5_keyblock *)key)))
goto cleanup;
}
#else
if ((ret = init_key_uef(krb_ctx_hSession(context), (krb5_keyblock *)key)))
return (ret);
#endif /* _KERNEL */
ret = (*(krb5_cksumtypes_list[i].keyhash->hash))(context, key,
usage, 0, input, &data);
} else if (krb5_cksumtypes_list[i].flags & KRB5_CKSUMFLAG_DERIVE) {
#ifdef _KERNEL
context->kef_cipher_mt = get_cipher_mech_type(context,
(krb5_keyblock *)key);
context->kef_hash_mt = get_hash_mech_type(context,
(krb5_keyblock *)key);
/*
* If the hash_mt is invalid, try using the cksum_mt
* because "hash" and "checksum" are overloaded terms
* in some places.
*/
if (context->kef_hash_mt == CRYPTO_MECH_INVALID)
context->kef_hash_mt = context->kef_cksum_mt;
#else
ret = init_key_uef(krb_ctx_hSession(context), (krb5_keyblock *)key);
if (ret)
return (ret);
#endif /* _KERNEL */
ret = krb5_dk_make_checksum(context,
krb5_cksumtypes_list[i].hash,
key, usage, input, &data);
} else {
/*
* No key is used, hash and cksum are synonymous
* in this case
*/
#ifdef _KERNEL
context->kef_hash_mt = context->kef_cksum_mt;
#endif /* _KERNEL */
ret = (*(krb5_cksumtypes_list[i].hash->hash))(context, 1,
input, &data);
}
if (!ret) {
cksum->magic = KV5M_CHECKSUM;
cksum->checksum_type = cksumtype;
if (krb5_cksumtypes_list[i].trunc_size) {
krb5_octet *trunc;
size_t old_len = cksum->length;
/*
* Solaris Kerberos:
* The Kernel does not like 'realloc' (which is what
* MIT code does here), so we do our own "realloc".
*/
cksum->length = krb5_cksumtypes_list[i].trunc_size;
trunc = (krb5_octet *) MALLOC(cksum->length);
if (trunc) {
(void) memcpy(trunc, cksum->contents, cksum->length);
FREE(cksum->contents, old_len);
cksum->contents = trunc;
} else {
ret = ENOMEM;
}
}
}
cleanup:
if (ret) {
(void) memset(cksum->contents, 0, cksum->length);
FREE(cksum->contents, cksum->length);
cksum->length = 0;
cksum->contents = NULL;
}
KRB5_LOG(KRB5_INFO, "krb5_c_make_checksum() end ret = %d\n", ret);
return(ret);
}
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