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6001e2adbcc438d3dfc2a88082d3fd2b2c5258a1
heimdal/lib/krb5/crypto.c
Benjamin Kaduk ad57868996 Fix KRB-FX-CF2 for enctypes with non-dense keyspaces 
It is necessary to use the RFC3961 random_to_key operation when
creating a key from a bitstring.

Signed-off-by: Nicolas Williams <nico@cryptonector.com>
2014-03-16 22:57:13 -05:00

2647 lines
66 KiB
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/*
* Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "krb5_locl.h"
struct _krb5_key_usage {
unsigned usage;
struct _krb5_key_data key;
};
#ifndef HEIMDAL_SMALLER
#define DES3_OLD_ENCTYPE 1
#endif
static krb5_error_code _get_derived_key(krb5_context, krb5_crypto,
unsigned, struct _krb5_key_data**);
static struct _krb5_key_data *_new_derived_key(krb5_crypto crypto, unsigned usage);
static void free_key_schedule(krb5_context,
struct _krb5_key_data *,
struct _krb5_encryption_type *);
/*
* Converts etype to a user readable string and sets as a side effect
* the krb5_error_message containing this string. Returns
* KRB5_PROG_ETYPE_NOSUPP in not the conversion of the etype failed in
* which case the error code of the etype convesion is returned.
*/
static krb5_error_code
unsupported_enctype(krb5_context context, krb5_enctype etype)
{
krb5_error_code ret;
char *name;
ret = krb5_enctype_to_string(context, etype, &name);
if (ret)
return ret;
krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
N_("Encryption type %s not supported", ""),
name);
free(name);
return KRB5_PROG_ETYPE_NOSUPP;
}
/*
*
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_enctype_keysize(krb5_context context,
krb5_enctype type,
size_t *keysize)
{
struct _krb5_encryption_type *et = _krb5_find_enctype(type);
if(et == NULL) {
return unsupported_enctype (context, type);
}
*keysize = et->keytype->size;
return 0;
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_enctype_keybits(krb5_context context,
krb5_enctype type,
size_t *keybits)
{
struct _krb5_encryption_type *et = _krb5_find_enctype(type);
if(et == NULL) {
return unsupported_enctype (context, type);
}
*keybits = et->keytype->bits;
return 0;
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_generate_random_keyblock(krb5_context context,
krb5_enctype type,
krb5_keyblock *key)
{
krb5_error_code ret;
struct _krb5_encryption_type *et = _krb5_find_enctype(type);
if(et == NULL) {
return unsupported_enctype (context, type);
}
ret = krb5_data_alloc(&key->keyvalue, et->keytype->size);
if(ret)
return ret;
key->keytype = type;
if(et->keytype->random_key)
(*et->keytype->random_key)(context, key);
else
krb5_generate_random_block(key->keyvalue.data,
key->keyvalue.length);
return 0;
}
static krb5_error_code
_key_schedule(krb5_context context,
struct _krb5_key_data *key)
{
krb5_error_code ret;
struct _krb5_encryption_type *et = _krb5_find_enctype(key->key->keytype);
struct _krb5_key_type *kt;
if (et == NULL) {
return unsupported_enctype (context,
key->key->keytype);
}
kt = et->keytype;
if(kt->schedule == NULL)
return 0;
if (key->schedule != NULL)
return 0;
ALLOC(key->schedule, 1);
if (key->schedule == NULL)
return krb5_enomem(context);
ret = krb5_data_alloc(key->schedule, kt->schedule_size);
if(ret) {
free(key->schedule);
key->schedule = NULL;
return ret;
}
(*kt->schedule)(context, kt, key);
return 0;
}
/************************************************************
* *
************************************************************/
static krb5_error_code
SHA1_checksum(krb5_context context,
struct _krb5_key_data *key,
const void *data,
size_t len,
unsigned usage,
Checksum *C)
{
if (EVP_Digest(data, len, C->checksum.data, NULL, EVP_sha1(), NULL) != 1)
krb5_abortx(context, "sha1 checksum failed");
return 0;
}
/* HMAC according to RFC2104 */
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
_krb5_internal_hmac(krb5_context context,
struct _krb5_checksum_type *cm,
const void *data,
size_t len,
unsigned usage,
struct _krb5_key_data *keyblock,
Checksum *result)
{
unsigned char *ipad, *opad;
unsigned char *key;
size_t key_len;
size_t i;
ipad = malloc(cm->blocksize + len);
if (ipad == NULL)
return ENOMEM;
opad = malloc(cm->blocksize + cm->checksumsize);
if (opad == NULL) {
free(ipad);
return ENOMEM;
}
memset(ipad, 0x36, cm->blocksize);
memset(opad, 0x5c, cm->blocksize);
if(keyblock->key->keyvalue.length > cm->blocksize){
(*cm->checksum)(context,
keyblock,
keyblock->key->keyvalue.data,
keyblock->key->keyvalue.length,
usage,
result);
key = result->checksum.data;
key_len = result->checksum.length;
} else {
key = keyblock->key->keyvalue.data;
key_len = keyblock->key->keyvalue.length;
}
for(i = 0; i < key_len; i++){
ipad[i] ^= key[i];
opad[i] ^= key[i];
}
memcpy(ipad + cm->blocksize, data, len);
(*cm->checksum)(context, keyblock, ipad, cm->blocksize + len,
usage, result);
memcpy(opad + cm->blocksize, result->checksum.data,
result->checksum.length);
(*cm->checksum)(context, keyblock, opad,
cm->blocksize + cm->checksumsize, usage, result);
memset(ipad, 0, cm->blocksize + len);
free(ipad);
memset(opad, 0, cm->blocksize + cm->checksumsize);
free(opad);
return 0;
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_hmac(krb5_context context,
krb5_cksumtype cktype,
const void *data,
size_t len,
unsigned usage,
krb5_keyblock *key,
Checksum *result)
{
struct _krb5_checksum_type *c = _krb5_find_checksum(cktype);
struct _krb5_key_data kd;
krb5_error_code ret;
if (c == NULL) {
krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
N_("checksum type %d not supported", ""),
cktype);
return KRB5_PROG_SUMTYPE_NOSUPP;
}
kd.key = key;
kd.schedule = NULL;
ret = _krb5_internal_hmac(context, c, data, len, usage, &kd, result);
if (kd.schedule)
krb5_free_data(context, kd.schedule);
return ret;
}
krb5_error_code
_krb5_SP_HMAC_SHA1_checksum(krb5_context context,
struct _krb5_key_data *key,
const void *data,
size_t len,
unsigned usage,
Checksum *result)
{
struct _krb5_checksum_type *c = _krb5_find_checksum(CKSUMTYPE_SHA1);
Checksum res;
char sha1_data[20];
krb5_error_code ret;
res.checksum.data = sha1_data;
res.checksum.length = sizeof(sha1_data);
ret = _krb5_internal_hmac(context, c, data, len, usage, key, &res);
if (ret)
krb5_abortx(context, "hmac failed");
memcpy(result->checksum.data, res.checksum.data, result->checksum.length);
return 0;
}
struct _krb5_checksum_type _krb5_checksum_sha1 = {
CKSUMTYPE_SHA1,
"sha1",
64,
20,
F_CPROOF,
SHA1_checksum,
NULL
};
KRB5_LIB_FUNCTION struct _krb5_checksum_type * KRB5_LIB_CALL
_krb5_find_checksum(krb5_cksumtype type)
{
int i;
for(i = 0; i < _krb5_num_checksums; i++)
if(_krb5_checksum_types[i]->type == type)
return _krb5_checksum_types[i];
return NULL;
}
static krb5_error_code
get_checksum_key(krb5_context context,
krb5_crypto crypto,
unsigned usage, /* not krb5_key_usage */
struct _krb5_checksum_type *ct,
struct _krb5_key_data **key)
{
krb5_error_code ret = 0;
if(ct->flags & F_DERIVED)
ret = _get_derived_key(context, crypto, usage, key);
else if(ct->flags & F_VARIANT) {
size_t i;
*key = _new_derived_key(crypto, 0xff/* KRB5_KU_RFC1510_VARIANT */);
if (*key == NULL)
return krb5_enomem(context);
ret = krb5_copy_keyblock(context, crypto->key.key, &(*key)->key);
if(ret)
return ret;
for(i = 0; i < (*key)->key->keyvalue.length; i++)
((unsigned char*)(*key)->key->keyvalue.data)[i] ^= 0xF0;
} else {
*key = &crypto->key;
}
if(ret == 0)
ret = _key_schedule(context, *key);
return ret;
}
static krb5_error_code
create_checksum (krb5_context context,
struct _krb5_checksum_type *ct,
krb5_crypto crypto,
unsigned usage,
void *data,
size_t len,
Checksum *result)
{
krb5_error_code ret;
struct _krb5_key_data *dkey;
int keyed_checksum;
if (ct->flags & F_DISABLED) {
krb5_clear_error_message (context);
return KRB5_PROG_SUMTYPE_NOSUPP;
}
keyed_checksum = (ct->flags & F_KEYED) != 0;
if(keyed_checksum && crypto == NULL) {
krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
N_("Checksum type %s is keyed but no "
"crypto context (key) was passed in", ""),
ct->name);
return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
}
if(keyed_checksum) {
ret = get_checksum_key(context, crypto, usage, ct, &dkey);
if (ret)
return ret;
} else
dkey = NULL;
result->cksumtype = ct->type;
ret = krb5_data_alloc(&result->checksum, ct->checksumsize);
if (ret)
return (ret);
return (*ct->checksum)(context, dkey, data, len, usage, result);
}
static int
arcfour_checksum_p(struct _krb5_checksum_type *ct, krb5_crypto crypto)
{
return (ct->type == CKSUMTYPE_HMAC_MD5) &&
(crypto->key.key->keytype == KEYTYPE_ARCFOUR);
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_create_checksum(krb5_context context,
krb5_crypto crypto,
krb5_key_usage usage,
int type,
void *data,
size_t len,
Checksum *result)
{
struct _krb5_checksum_type *ct = NULL;
unsigned keyusage;
/* type 0 -> pick from crypto */
if (type) {
ct = _krb5_find_checksum(type);
} else if (crypto) {
ct = crypto->et->keyed_checksum;
if (ct == NULL)
ct = crypto->et->checksum;
}
if(ct == NULL) {
krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
N_("checksum type %d not supported", ""),
type);
return KRB5_PROG_SUMTYPE_NOSUPP;
}
if (arcfour_checksum_p(ct, crypto)) {
keyusage = usage;
_krb5_usage2arcfour(context, &keyusage);
} else
keyusage = CHECKSUM_USAGE(usage);
return create_checksum(context, ct, crypto, keyusage,
data, len, result);
}
static krb5_error_code
verify_checksum(krb5_context context,
krb5_crypto crypto,
unsigned usage, /* not krb5_key_usage */
void *data,
size_t len,
Checksum *cksum)
{
krb5_error_code ret;
struct _krb5_key_data *dkey;
int keyed_checksum;
Checksum c;
struct _krb5_checksum_type *ct;
ct = _krb5_find_checksum(cksum->cksumtype);
if (ct == NULL || (ct->flags & F_DISABLED)) {
krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
N_("checksum type %d not supported", ""),
cksum->cksumtype);
return KRB5_PROG_SUMTYPE_NOSUPP;
}
if(ct->checksumsize != cksum->checksum.length) {
krb5_clear_error_message (context);
krb5_set_error_message(context, KRB5KRB_AP_ERR_BAD_INTEGRITY,
N_("Decrypt integrity check failed for checksum type %s, "
"length was %u, expected %u", ""),
ct->name, (unsigned)cksum->checksum.length,
(unsigned)ct->checksumsize);
return KRB5KRB_AP_ERR_BAD_INTEGRITY; /* XXX */
}
keyed_checksum = (ct->flags & F_KEYED) != 0;
if(keyed_checksum) {
struct _krb5_checksum_type *kct;
if (crypto == NULL) {
krb5_set_error_message(context, KRB5_PROG_SUMTYPE_NOSUPP,
N_("Checksum type %s is keyed but no "
"crypto context (key) was passed in", ""),
ct->name);
return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
}
kct = crypto->et->keyed_checksum;
if (kct == NULL || kct->type != ct->type) {
krb5_set_error_message(context, KRB5_PROG_SUMTYPE_NOSUPP,
N_("Checksum type %s is keyed, but "
"the key type %s passed didnt have that checksum "
"type as the keyed type", ""),
ct->name, crypto->et->name);
return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
}
ret = get_checksum_key(context, crypto, usage, ct, &dkey);
if (ret)
return ret;
} else
dkey = NULL;
/*
* If checksum have a verify function, lets use that instead of
* calling ->checksum and then compare result.
*/
if(ct->verify) {
ret = (*ct->verify)(context, dkey, data, len, usage, cksum);
if (ret)
krb5_set_error_message(context, ret,
N_("Decrypt integrity check failed for checksum "
"type %s, key type %s", ""),
ct->name, (crypto != NULL)? crypto->et->name : "(none)");
return ret;
}
ret = krb5_data_alloc (&c.checksum, ct->checksumsize);
if (ret)
return ret;
ret = (*ct->checksum)(context, dkey, data, len, usage, &c);
if (ret) {
krb5_data_free(&c.checksum);
return ret;
}
if(krb5_data_ct_cmp(&c.checksum, &cksum->checksum) != 0) {
ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
krb5_set_error_message(context, ret,
N_("Decrypt integrity check failed for checksum "
"type %s, key type %s", ""),
ct->name, crypto ? crypto->et->name : "(unkeyed)");
} else {
ret = 0;
}
krb5_data_free (&c.checksum);
return ret;
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_verify_checksum(krb5_context context,
krb5_crypto crypto,
krb5_key_usage usage,
void *data,
size_t len,
Checksum *cksum)
{
struct _krb5_checksum_type *ct;
unsigned keyusage;
ct = _krb5_find_checksum(cksum->cksumtype);
if(ct == NULL) {
krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
N_("checksum type %d not supported", ""),
cksum->cksumtype);
return KRB5_PROG_SUMTYPE_NOSUPP;
}
if (arcfour_checksum_p(ct, crypto)) {
keyusage = usage;
_krb5_usage2arcfour(context, &keyusage);
} else
keyusage = CHECKSUM_USAGE(usage);
return verify_checksum(context, crypto, keyusage,
data, len, cksum);
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_crypto_get_checksum_type(krb5_context context,
krb5_crypto crypto,
krb5_cksumtype *type)
{
struct _krb5_checksum_type *ct = NULL;
if (crypto != NULL) {
ct = crypto->et->keyed_checksum;
if (ct == NULL)
ct = crypto->et->checksum;
}
if (ct == NULL) {
krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
N_("checksum type not found", ""));
return KRB5_PROG_SUMTYPE_NOSUPP;
}
*type = ct->type;
return 0;
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_checksumsize(krb5_context context,
krb5_cksumtype type,
size_t *size)
{
struct _krb5_checksum_type *ct = _krb5_find_checksum(type);
if(ct == NULL) {
krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
N_("checksum type %d not supported", ""),
type);
return KRB5_PROG_SUMTYPE_NOSUPP;
}
*size = ct->checksumsize;
return 0;
}
KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
krb5_checksum_is_keyed(krb5_context context,
krb5_cksumtype type)
{
struct _krb5_checksum_type *ct = _krb5_find_checksum(type);
if(ct == NULL) {
if (context)
krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
N_("checksum type %d not supported", ""),
type);
return KRB5_PROG_SUMTYPE_NOSUPP;
}
return ct->flags & F_KEYED;
}
KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
krb5_checksum_is_collision_proof(krb5_context context,
krb5_cksumtype type)
{
struct _krb5_checksum_type *ct = _krb5_find_checksum(type);
if(ct == NULL) {
if (context)
krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
N_("checksum type %d not supported", ""),
type);
return KRB5_PROG_SUMTYPE_NOSUPP;
}
return ct->flags & F_CPROOF;
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_checksum_disable(krb5_context context,
krb5_cksumtype type)
{
struct _krb5_checksum_type *ct = _krb5_find_checksum(type);
if(ct == NULL) {
if (context)
krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
N_("checksum type %d not supported", ""),
type);
return KRB5_PROG_SUMTYPE_NOSUPP;
}
ct->flags |= F_DISABLED;
return 0;
}
/************************************************************
* *
************************************************************/
KRB5_LIB_FUNCTION struct _krb5_encryption_type * KRB5_LIB_CALL
_krb5_find_enctype(krb5_enctype type)
{
int i;
for(i = 0; i < _krb5_num_etypes; i++)
if(_krb5_etypes[i]->type == type)
return _krb5_etypes[i];
return NULL;
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_enctype_to_string(krb5_context context,
krb5_enctype etype,
char **string)
{
struct _krb5_encryption_type *e;
e = _krb5_find_enctype(etype);
if(e == NULL) {
krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
N_("encryption type %d not supported", ""),
etype);
*string = NULL;
return KRB5_PROG_ETYPE_NOSUPP;
}
*string = strdup(e->name);
if (*string == NULL)
return krb5_enomem(context);
return 0;
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_string_to_enctype(krb5_context context,
const char *string,
krb5_enctype *etype)
{
int i;
for(i = 0; i < _krb5_num_etypes; i++) {
if(strcasecmp(_krb5_etypes[i]->name, string) == 0){
*etype = _krb5_etypes[i]->type;
return 0;
}
if(_krb5_etypes[i]->alias != NULL &&
strcasecmp(_krb5_etypes[i]->alias, string) == 0){
*etype = _krb5_etypes[i]->type;
return 0;
}
}
krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
N_("encryption type %s not supported", ""),
string);
return KRB5_PROG_ETYPE_NOSUPP;
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_enctype_to_keytype(krb5_context context,
krb5_enctype etype,
krb5_keytype *keytype)
{
struct _krb5_encryption_type *e = _krb5_find_enctype(etype);
if(e == NULL) {
return unsupported_enctype (context, etype);
}
*keytype = e->keytype->type; /* XXX */
return 0;
}
/**
* Check if a enctype is valid, return 0 if it is.
*
* @param context Kerberos context
* @param etype enctype to check if its valid or not
*
* @return Return an error code for an failure or 0 on success (enctype valid).
* @ingroup krb5_crypto
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_enctype_valid(krb5_context context,
krb5_enctype etype)
{
struct _krb5_encryption_type *e = _krb5_find_enctype(etype);
if(e && (e->flags & F_DISABLED) == 0)
return 0;
if (context == NULL)
return KRB5_PROG_ETYPE_NOSUPP;
if(e == NULL) {
return unsupported_enctype (context, etype);
}
/* Must be (e->flags & F_DISABLED) */
krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
N_("encryption type %s is disabled", ""),
e->name);
return KRB5_PROG_ETYPE_NOSUPP;
}
/**
* Return the coresponding encryption type for a checksum type.
*
* @param context Kerberos context
* @param ctype The checksum type to get the result enctype for
* @param etype The returned encryption, when the matching etype is
* not found, etype is set to ETYPE_NULL.
*
* @return Return an error code for an failure or 0 on success.
* @ingroup krb5_crypto
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_cksumtype_to_enctype(krb5_context context,
krb5_cksumtype ctype,
krb5_enctype *etype)
{
int i;
*etype = ETYPE_NULL;
for(i = 0; i < _krb5_num_etypes; i++) {
if(_krb5_etypes[i]->keyed_checksum &&
_krb5_etypes[i]->keyed_checksum->type == ctype)
{
*etype = _krb5_etypes[i]->type;
return 0;
}
}
krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
N_("checksum type %d not supported", ""),
(int)ctype);
return KRB5_PROG_SUMTYPE_NOSUPP;
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_cksumtype_valid(krb5_context context,
krb5_cksumtype ctype)
{
struct _krb5_checksum_type *c = _krb5_find_checksum(ctype);
if (c == NULL) {
krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
N_("checksum type %d not supported", ""),
ctype);
return KRB5_PROG_SUMTYPE_NOSUPP;
}
if (c->flags & F_DISABLED) {
krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
N_("checksum type %s is disabled", ""),
c->name);
return KRB5_PROG_SUMTYPE_NOSUPP;
}
return 0;
}
static krb5_boolean
derived_crypto(krb5_context context,
krb5_crypto crypto)
{
return (crypto->et->flags & F_DERIVED) != 0;
}
static krb5_boolean
special_crypto(krb5_context context,
krb5_crypto crypto)
{
return (crypto->et->flags & F_SPECIAL) != 0;
}
#define CHECKSUMSIZE(C) ((C)->checksumsize)
#define CHECKSUMTYPE(C) ((C)->type)
static krb5_error_code
encrypt_internal_derived(krb5_context context,
krb5_crypto crypto,
unsigned usage,
const void *data,
size_t len,
krb5_data *result,
void *ivec)
{
size_t sz, block_sz, checksum_sz, total_sz;
Checksum cksum;
unsigned char *p, *q;
krb5_error_code ret;
struct _krb5_key_data *dkey;
const struct _krb5_encryption_type *et = crypto->et;
checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
sz = et->confoundersize + len;
block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
total_sz = block_sz + checksum_sz;
p = calloc(1, total_sz);
if (p == NULL)
return krb5_enomem(context);
q = p;
krb5_generate_random_block(q, et->confoundersize); /* XXX */
q += et->confoundersize;
memcpy(q, data, len);
ret = create_checksum(context,
et->keyed_checksum,
crypto,
INTEGRITY_USAGE(usage),
p,
block_sz,
&cksum);
if(ret == 0 && cksum.checksum.length != checksum_sz) {
free_Checksum (&cksum);
krb5_clear_error_message (context);
ret = KRB5_CRYPTO_INTERNAL;
}
if(ret)
goto fail;
memcpy(p + block_sz, cksum.checksum.data, cksum.checksum.length);
free_Checksum (&cksum);
ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
if(ret)
goto fail;
ret = _key_schedule(context, dkey);
if(ret)
goto fail;
ret = (*et->encrypt)(context, dkey, p, block_sz, 1, usage, ivec);
if (ret)
goto fail;
result->data = p;
result->length = total_sz;
return 0;
fail:
memset(p, 0, total_sz);
free(p);
return ret;
}
static krb5_error_code
encrypt_internal(krb5_context context,
krb5_crypto crypto,
const void *data,
size_t len,
krb5_data *result,
void *ivec)
{
size_t sz, block_sz, checksum_sz;
Checksum cksum;
unsigned char *p, *q;
krb5_error_code ret;
const struct _krb5_encryption_type *et = crypto->et;
checksum_sz = CHECKSUMSIZE(et->checksum);
sz = et->confoundersize + checksum_sz + len;
block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
p = calloc(1, block_sz);
if (p == NULL)
return krb5_enomem(context);
q = p;
krb5_generate_random_block(q, et->confoundersize); /* XXX */
q += et->confoundersize;
memset(q, 0, checksum_sz);
q += checksum_sz;
memcpy(q, data, len);
ret = create_checksum(context,
et->checksum,
crypto,
0,
p,
block_sz,
&cksum);
if(ret == 0 && cksum.checksum.length != checksum_sz) {
krb5_clear_error_message (context);
free_Checksum(&cksum);
ret = KRB5_CRYPTO_INTERNAL;
}
if(ret)
goto fail;
memcpy(p + et->confoundersize, cksum.checksum.data, cksum.checksum.length);
free_Checksum(&cksum);
ret = _key_schedule(context, &crypto->key);
if(ret)
goto fail;
ret = (*et->encrypt)(context, &crypto->key, p, block_sz, 1, 0, ivec);
if (ret) {
memset(p, 0, block_sz);
free(p);
return ret;
}
result->data = p;
result->length = block_sz;
return 0;
fail:
memset(p, 0, block_sz);
free(p);
return ret;
}
static krb5_error_code
encrypt_internal_special(krb5_context context,
krb5_crypto crypto,
int usage,
const void *data,
size_t len,
krb5_data *result,
void *ivec)
{
struct _krb5_encryption_type *et = crypto->et;
size_t cksum_sz = CHECKSUMSIZE(et->checksum);
size_t sz = len + cksum_sz + et->confoundersize;
char *tmp, *p;
krb5_error_code ret;
tmp = malloc (sz);
if (tmp == NULL)
return krb5_enomem(context);
p = tmp;
memset (p, 0, cksum_sz);
p += cksum_sz;
krb5_generate_random_block(p, et->confoundersize);
p += et->confoundersize;
memcpy (p, data, len);
ret = (*et->encrypt)(context, &crypto->key, tmp, sz, TRUE, usage, ivec);
if (ret) {
memset(tmp, 0, sz);
free(tmp);
return ret;
}
result->data = tmp;
result->length = sz;
return 0;
}
static krb5_error_code
decrypt_internal_derived(krb5_context context,
krb5_crypto crypto,
unsigned usage,
void *data,
size_t len,
krb5_data *result,
void *ivec)
{
size_t checksum_sz;
Checksum cksum;
unsigned char *p;
krb5_error_code ret;
struct _krb5_key_data *dkey;
struct _krb5_encryption_type *et = crypto->et;
unsigned long l;
checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
if (len < checksum_sz + et->confoundersize) {
krb5_set_error_message(context, KRB5_BAD_MSIZE,
N_("Encrypted data shorter then "
"checksum + confunder", ""));
return KRB5_BAD_MSIZE;
}
if (((len - checksum_sz) % et->padsize) != 0) {
krb5_clear_error_message(context);
return KRB5_BAD_MSIZE;
}
p = malloc(len);
if (len != 0 && p == NULL)
return krb5_enomem(context);
memcpy(p, data, len);
len -= checksum_sz;
ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
if(ret) {
free(p);
return ret;
}
ret = _key_schedule(context, dkey);
if(ret) {
free(p);
return ret;
}
ret = (*et->encrypt)(context, dkey, p, len, 0, usage, ivec);
if (ret) {
free(p);
return ret;
}
cksum.checksum.data = p + len;
cksum.checksum.length = checksum_sz;
cksum.cksumtype = CHECKSUMTYPE(et->keyed_checksum);
ret = verify_checksum(context,
crypto,
INTEGRITY_USAGE(usage),
p,
len,
&cksum);
if(ret) {
free(p);
return ret;
}
l = len - et->confoundersize;
memmove(p, p + et->confoundersize, l);
result->data = realloc(p, l);
if(result->data == NULL && l != 0) {
free(p);
return krb5_enomem(context);
}
result->length = l;
return 0;
}
static krb5_error_code
decrypt_internal(krb5_context context,
krb5_crypto crypto,
void *data,
size_t len,
krb5_data *result,
void *ivec)
{
krb5_error_code ret;
unsigned char *p;
Checksum cksum;
size_t checksum_sz, l;
struct _krb5_encryption_type *et = crypto->et;
if ((len % et->padsize) != 0) {
krb5_clear_error_message(context);
return KRB5_BAD_MSIZE;
}
checksum_sz = CHECKSUMSIZE(et->checksum);
if (len < checksum_sz + et->confoundersize) {
krb5_set_error_message(context, KRB5_BAD_MSIZE,
N_("Encrypted data shorter then "
"checksum + confunder", ""));
return KRB5_BAD_MSIZE;
}
p = malloc(len);
if (len != 0 && p == NULL)
return krb5_enomem(context);
memcpy(p, data, len);
ret = _key_schedule(context, &crypto->key);
if(ret) {
free(p);
return ret;
}
ret = (*et->encrypt)(context, &crypto->key, p, len, 0, 0, ivec);
if (ret) {
free(p);
return ret;
}
ret = krb5_data_copy(&cksum.checksum, p + et->confoundersize, checksum_sz);
if(ret) {
free(p);
return ret;
}
memset(p + et->confoundersize, 0, checksum_sz);
cksum.cksumtype = CHECKSUMTYPE(et->checksum);
ret = verify_checksum(context, NULL, 0, p, len, &cksum);
free_Checksum(&cksum);
if(ret) {
free(p);
return ret;
}
l = len - et->confoundersize - checksum_sz;
memmove(p, p + et->confoundersize + checksum_sz, l);
result->data = realloc(p, l);
if(result->data == NULL && l != 0) {
free(p);
return krb5_enomem(context);
}
result->length = l;
return 0;
}
static krb5_error_code
decrypt_internal_special(krb5_context context,
krb5_crypto crypto,
int usage,
void *data,
size_t len,
krb5_data *result,
void *ivec)
{
struct _krb5_encryption_type *et = crypto->et;
size_t cksum_sz = CHECKSUMSIZE(et->checksum);
size_t sz = len - cksum_sz - et->confoundersize;
unsigned char *p;
krb5_error_code ret;
if ((len % et->padsize) != 0) {
krb5_clear_error_message(context);
return KRB5_BAD_MSIZE;
}
if (len < cksum_sz + et->confoundersize) {
krb5_set_error_message(context, KRB5_BAD_MSIZE,
N_("Encrypted data shorter then "
"checksum + confunder", ""));
return KRB5_BAD_MSIZE;
}
p = malloc (len);
if (p == NULL)
return krb5_enomem(context);
memcpy(p, data, len);
ret = (*et->encrypt)(context, &crypto->key, p, len, FALSE, usage, ivec);
if (ret) {
free(p);
return ret;
}
memmove (p, p + cksum_sz + et->confoundersize, sz);
result->data = realloc(p, sz);
if(result->data == NULL && sz != 0) {
free(p);
return krb5_enomem(context);
}
result->length = sz;
return 0;
}
static krb5_crypto_iov *
find_iv(krb5_crypto_iov *data, size_t num_data, unsigned type)
{
size_t i;
for (i = 0; i < num_data; i++)
if (data[i].flags == type)
return &data[i];
return NULL;
}
/**
* Inline encrypt a kerberos message
*
* @param context Kerberos context
* @param crypto Kerberos crypto context
* @param usage Key usage for this buffer
* @param data array of buffers to process
* @param num_data length of array
* @param ivec initial cbc/cts vector
*
* @return Return an error code or 0.
* @ingroup krb5_crypto
*
* Kerberos encrypted data look like this:
*
* 1. KRB5_CRYPTO_TYPE_HEADER
* 2. array [1,...] KRB5_CRYPTO_TYPE_DATA and array [0,...]
* KRB5_CRYPTO_TYPE_SIGN_ONLY in any order, however the receiver
* have to aware of the order. KRB5_CRYPTO_TYPE_SIGN_ONLY is
* commonly used headers and trailers.
* 3. KRB5_CRYPTO_TYPE_PADDING, at least on padsize long if padsize > 1
* 4. KRB5_CRYPTO_TYPE_TRAILER
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_encrypt_iov_ivec(krb5_context context,
krb5_crypto crypto,
unsigned usage,
krb5_crypto_iov *data,
int num_data,
void *ivec)
{
size_t headersz, trailersz, len;
int i;
size_t sz, block_sz, pad_sz;
Checksum cksum;
unsigned char *p, *q;
krb5_error_code ret;
struct _krb5_key_data *dkey;
const struct _krb5_encryption_type *et = crypto->et;
krb5_crypto_iov *tiv, *piv, *hiv;
if (num_data < 0) {
krb5_clear_error_message(context);
return KRB5_CRYPTO_INTERNAL;
}
if(!derived_crypto(context, crypto)) {
krb5_clear_error_message(context);
return KRB5_CRYPTO_INTERNAL;
}
headersz = et->confoundersize;
trailersz = CHECKSUMSIZE(et->keyed_checksum);
for (len = 0, i = 0; i < num_data; i++) {
if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
continue;
len += data[i].data.length;
}
sz = headersz + len;
block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
pad_sz = block_sz - sz;
/* header */
hiv = find_iv(data, num_data, KRB5_CRYPTO_TYPE_HEADER);
if (hiv == NULL || hiv->data.length != headersz)
return KRB5_BAD_MSIZE;
krb5_generate_random_block(hiv->data.data, hiv->data.length);
/* padding */
piv = find_iv(data, num_data, KRB5_CRYPTO_TYPE_PADDING);
/* its ok to have no TYPE_PADDING if there is no padding */
if (piv == NULL && pad_sz != 0)
return KRB5_BAD_MSIZE;
if (piv) {
if (piv->data.length < pad_sz)
return KRB5_BAD_MSIZE;
piv->data.length = pad_sz;
if (pad_sz)
memset(piv->data.data, pad_sz, pad_sz);
else
piv = NULL;
}
/* trailer */
tiv = find_iv(data, num_data, KRB5_CRYPTO_TYPE_TRAILER);
if (tiv == NULL || tiv->data.length != trailersz)
return KRB5_BAD_MSIZE;
/*
* XXX replace with EVP_Sign? at least make create_checksum an iov
* function.
* XXX CTS EVP is broken, can't handle multi buffers :(
*/
len = block_sz;
for (i = 0; i < num_data; i++) {
if (data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
continue;
len += data[i].data.length;
}
p = q = malloc(len);
memcpy(q, hiv->data.data, hiv->data.length);
q += hiv->data.length;
for (i = 0; i < num_data; i++) {
if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
continue;
memcpy(q, data[i].data.data, data[i].data.length);
q += data[i].data.length;
}
if (piv)
memset(q, 0, piv->data.length);
ret = create_checksum(context,
et->keyed_checksum,
crypto,
INTEGRITY_USAGE(usage),
p,
len,
&cksum);
free(p);
if(ret == 0 && cksum.checksum.length != trailersz) {
free_Checksum (&cksum);
krb5_clear_error_message (context);
ret = KRB5_CRYPTO_INTERNAL;
}
if(ret)
return ret;
/* save cksum at end */
memcpy(tiv->data.data, cksum.checksum.data, cksum.checksum.length);
free_Checksum (&cksum);
/* XXX replace with EVP_Cipher */
p = q = malloc(block_sz);
if(p == NULL)
return ENOMEM;
memcpy(q, hiv->data.data, hiv->data.length);
q += hiv->data.length;
for (i = 0; i < num_data; i++) {
if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
continue;
memcpy(q, data[i].data.data, data[i].data.length);
q += data[i].data.length;
}
if (piv)
memset(q, 0, piv->data.length);
ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
if(ret) {
free(p);
return ret;
}
ret = _key_schedule(context, dkey);
if(ret) {
free(p);
return ret;
}
ret = (*et->encrypt)(context, dkey, p, block_sz, 1, usage, ivec);
if (ret) {
free(p);
return ret;
}
/* now copy data back to buffers */
q = p;
memcpy(hiv->data.data, q, hiv->data.length);
q += hiv->data.length;
for (i = 0; i < num_data; i++) {
if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
continue;
memcpy(data[i].data.data, q, data[i].data.length);
q += data[i].data.length;
}
if (piv)
memcpy(piv->data.data, q, pad_sz);
free(p);
return ret;
}
/**
* Inline decrypt a Kerberos message.
*
* @param context Kerberos context
* @param crypto Kerberos crypto context
* @param usage Key usage for this buffer
* @param data array of buffers to process
* @param num_data length of array
* @param ivec initial cbc/cts vector
*
* @return Return an error code or 0.
* @ingroup krb5_crypto
*
* 1. KRB5_CRYPTO_TYPE_HEADER
* 2. one KRB5_CRYPTO_TYPE_DATA and array [0,...] of KRB5_CRYPTO_TYPE_SIGN_ONLY in
* any order, however the receiver have to aware of the
* order. KRB5_CRYPTO_TYPE_SIGN_ONLY is commonly used unencrypoted
* protocol headers and trailers. The output data will be of same
* size as the input data or shorter.
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_decrypt_iov_ivec(krb5_context context,
krb5_crypto crypto,
unsigned usage,
krb5_crypto_iov *data,
unsigned int num_data,
void *ivec)
{
unsigned int i;
size_t headersz, trailersz, len;
Checksum cksum;
unsigned char *p, *q;
krb5_error_code ret;
struct _krb5_key_data *dkey;
struct _krb5_encryption_type *et = crypto->et;
krb5_crypto_iov *tiv, *hiv;
if(!derived_crypto(context, crypto)) {
krb5_clear_error_message(context);
return KRB5_CRYPTO_INTERNAL;
}
headersz = et->confoundersize;
hiv = find_iv(data, num_data, KRB5_CRYPTO_TYPE_HEADER);
if (hiv == NULL || hiv->data.length != headersz)
return KRB5_BAD_MSIZE;
/* trailer */
trailersz = CHECKSUMSIZE(et->keyed_checksum);
tiv = find_iv(data, num_data, KRB5_CRYPTO_TYPE_TRAILER);
if (tiv->data.length != trailersz)
return KRB5_BAD_MSIZE;
/* Find length of data we will decrypt */
len = headersz;
for (i = 0; i < num_data; i++) {
if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
continue;
len += data[i].data.length;
}
if ((len % et->padsize) != 0) {
krb5_clear_error_message(context);
return KRB5_BAD_MSIZE;
}
/* XXX replace with EVP_Cipher */
p = q = malloc(len);
if (p == NULL)
return ENOMEM;
memcpy(q, hiv->data.data, hiv->data.length);
q += hiv->data.length;
for (i = 0; i < num_data; i++) {
if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
continue;
memcpy(q, data[i].data.data, data[i].data.length);
q += data[i].data.length;
}
ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
if(ret) {
free(p);
return ret;
}
ret = _key_schedule(context, dkey);
if(ret) {
free(p);
return ret;
}
ret = (*et->encrypt)(context, dkey, p, len, 0, usage, ivec);
if (ret) {
free(p);
return ret;
}
/* copy data back to buffers */
memcpy(hiv->data.data, p, hiv->data.length);
q = p + hiv->data.length;
for (i = 0; i < num_data; i++) {
if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
continue;
memcpy(data[i].data.data, q, data[i].data.length);
q += data[i].data.length;
}
free(p);
/* check signature */
for (i = 0; i < num_data; i++) {
if (data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
continue;
len += data[i].data.length;
}
p = q = malloc(len);
if (p == NULL)
return ENOMEM;
memcpy(q, hiv->data.data, hiv->data.length);
q += hiv->data.length;
for (i = 0; i < num_data; i++) {
if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
continue;
memcpy(q, data[i].data.data, data[i].data.length);
q += data[i].data.length;
}
cksum.checksum.data = tiv->data.data;
cksum.checksum.length = tiv->data.length;
cksum.cksumtype = CHECKSUMTYPE(et->keyed_checksum);
ret = verify_checksum(context,
crypto,
INTEGRITY_USAGE(usage),
p,
len,
&cksum);
free(p);
return ret;
}
/**
* Create a Kerberos message checksum.
*
* @param context Kerberos context
* @param crypto Kerberos crypto context
* @param usage Key usage for this buffer
* @param data array of buffers to process
* @param num_data length of array
* @param type output data
*
* @return Return an error code or 0.
* @ingroup krb5_crypto
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_create_checksum_iov(krb5_context context,
krb5_crypto crypto,
unsigned usage,
krb5_crypto_iov *data,
unsigned int num_data,
krb5_cksumtype *type)
{
Checksum cksum;
krb5_crypto_iov *civ;
krb5_error_code ret;
size_t i;
size_t len;
char *p, *q;
if(!derived_crypto(context, crypto)) {
krb5_clear_error_message(context);
return KRB5_CRYPTO_INTERNAL;
}
civ = find_iv(data, num_data, KRB5_CRYPTO_TYPE_CHECKSUM);
if (civ == NULL)
return KRB5_BAD_MSIZE;
len = 0;
for (i = 0; i < num_data; i++) {
if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
continue;
len += data[i].data.length;
}
p = q = malloc(len);
for (i = 0; i < num_data; i++) {
if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
continue;
memcpy(q, data[i].data.data, data[i].data.length);
q += data[i].data.length;
}
ret = krb5_create_checksum(context, crypto, usage, 0, p, len, &cksum);
free(p);
if (ret)
return ret;
if (type)
*type = cksum.cksumtype;
if (cksum.checksum.length > civ->data.length) {
krb5_set_error_message(context, KRB5_BAD_MSIZE,
N_("Checksum larger then input buffer", ""));
free_Checksum(&cksum);
return KRB5_BAD_MSIZE;
}
civ->data.length = cksum.checksum.length;
memcpy(civ->data.data, cksum.checksum.data, civ->data.length);
free_Checksum(&cksum);
return 0;
}
/**
* Verify a Kerberos message checksum.
*
* @param context Kerberos context
* @param crypto Kerberos crypto context
* @param usage Key usage for this buffer
* @param data array of buffers to process
* @param num_data length of array
* @param type return checksum type if not NULL
*
* @return Return an error code or 0.
* @ingroup krb5_crypto
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_verify_checksum_iov(krb5_context context,
krb5_crypto crypto,
unsigned usage,
krb5_crypto_iov *data,
unsigned int num_data,
krb5_cksumtype *type)
{
struct _krb5_encryption_type *et = crypto->et;
Checksum cksum;
krb5_crypto_iov *civ;
krb5_error_code ret;
size_t i;
size_t len;
char *p, *q;
if(!derived_crypto(context, crypto)) {
krb5_clear_error_message(context);
return KRB5_CRYPTO_INTERNAL;
}
civ = find_iv(data, num_data, KRB5_CRYPTO_TYPE_CHECKSUM);
if (civ == NULL)
return KRB5_BAD_MSIZE;
len = 0;
for (i = 0; i < num_data; i++) {
if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
continue;
len += data[i].data.length;
}
p = q = malloc(len);
for (i = 0; i < num_data; i++) {
if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
continue;
memcpy(q, data[i].data.data, data[i].data.length);
q += data[i].data.length;
}
cksum.cksumtype = CHECKSUMTYPE(et->keyed_checksum);
cksum.checksum.length = civ->data.length;
cksum.checksum.data = civ->data.data;
ret = krb5_verify_checksum(context, crypto, usage, p, len, &cksum);
free(p);
if (ret == 0 && type)
*type = cksum.cksumtype;
return ret;
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_crypto_length(krb5_context context,
krb5_crypto crypto,
int type,
size_t *len)
{
if (!derived_crypto(context, crypto)) {
krb5_set_error_message(context, EINVAL, "not a derived crypto");
return EINVAL;
}
switch(type) {
case KRB5_CRYPTO_TYPE_EMPTY:
*len = 0;
return 0;
case KRB5_CRYPTO_TYPE_HEADER:
*len = crypto->et->blocksize;
return 0;
case KRB5_CRYPTO_TYPE_DATA:
case KRB5_CRYPTO_TYPE_SIGN_ONLY:
/* len must already been filled in */
return 0;
case KRB5_CRYPTO_TYPE_PADDING:
if (crypto->et->padsize > 1)
*len = crypto->et->padsize;
else
*len = 0;
return 0;
case KRB5_CRYPTO_TYPE_TRAILER:
*len = CHECKSUMSIZE(crypto->et->keyed_checksum);
return 0;
case KRB5_CRYPTO_TYPE_CHECKSUM:
if (crypto->et->keyed_checksum)
*len = CHECKSUMSIZE(crypto->et->keyed_checksum);
else
*len = CHECKSUMSIZE(crypto->et->checksum);
return 0;
}
krb5_set_error_message(context, EINVAL,
"%d not a supported type", type);
return EINVAL;
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_crypto_length_iov(krb5_context context,
krb5_crypto crypto,
krb5_crypto_iov *data,
unsigned int num_data)
{
krb5_error_code ret;
size_t i;
for (i = 0; i < num_data; i++) {
ret = krb5_crypto_length(context, crypto,
data[i].flags,
&data[i].data.length);
if (ret)
return ret;
}
return 0;
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_encrypt_ivec(krb5_context context,
krb5_crypto crypto,
unsigned usage,
const void *data,
size_t len,
krb5_data *result,
void *ivec)
{
if(derived_crypto(context, crypto))
return encrypt_internal_derived(context, crypto, usage,
data, len, result, ivec);
else if (special_crypto(context, crypto))
return encrypt_internal_special (context, crypto, usage,
data, len, result, ivec);
else
return encrypt_internal(context, crypto, data, len, result, ivec);
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_encrypt(krb5_context context,
krb5_crypto crypto,
unsigned usage,
const void *data,
size_t len,
krb5_data *result)
{
return krb5_encrypt_ivec(context, crypto, usage, data, len, result, NULL);
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_encrypt_EncryptedData(krb5_context context,
krb5_crypto crypto,
unsigned usage,
void *data,
size_t len,
int kvno,
EncryptedData *result)
{
result->etype = CRYPTO_ETYPE(crypto);
if(kvno){
ALLOC(result->kvno, 1);
*result->kvno = kvno;
}else
result->kvno = NULL;
return krb5_encrypt(context, crypto, usage, data, len, &result->cipher);
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_decrypt_ivec(krb5_context context,
krb5_crypto crypto,
unsigned usage,
void *data,
size_t len,
krb5_data *result,
void *ivec)
{
if(derived_crypto(context, crypto))
return decrypt_internal_derived(context, crypto, usage,
data, len, result, ivec);
else if (special_crypto (context, crypto))
return decrypt_internal_special(context, crypto, usage,
data, len, result, ivec);
else
return decrypt_internal(context, crypto, data, len, result, ivec);
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_decrypt(krb5_context context,
krb5_crypto crypto,
unsigned usage,
void *data,
size_t len,
krb5_data *result)
{
return krb5_decrypt_ivec (context, crypto, usage, data, len, result,
NULL);
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_decrypt_EncryptedData(krb5_context context,
krb5_crypto crypto,
unsigned usage,
const EncryptedData *e,
krb5_data *result)
{
return krb5_decrypt(context, crypto, usage,
e->cipher.data, e->cipher.length, result);
}
/************************************************************
* *
************************************************************/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
_krb5_derive_key(krb5_context context,
struct _krb5_encryption_type *et,
struct _krb5_key_data *key,
const void *constant,
size_t len)
{
unsigned char *k = NULL;
unsigned int nblocks = 0, i;
krb5_error_code ret = 0;
struct _krb5_key_type *kt = et->keytype;
ret = _key_schedule(context, key);
if(ret)
return ret;
if(et->blocksize * 8 < kt->bits || len != et->blocksize) {
nblocks = (kt->bits + et->blocksize * 8 - 1) / (et->blocksize * 8);
k = malloc(nblocks * et->blocksize);
if(k == NULL) {
ret = krb5_enomem(context);
goto out;
}
ret = _krb5_n_fold(constant, len, k, et->blocksize);
if (ret) {
krb5_enomem(context);
goto out;
}
for(i = 0; i < nblocks; i++) {
if(i > 0)
memcpy(k + i * et->blocksize,
k + (i - 1) * et->blocksize,
et->blocksize);
(*et->encrypt)(context, key, k + i * et->blocksize, et->blocksize,
1, 0, NULL);
}
} else {
/* this case is probably broken, but won't be run anyway */
void *c = malloc(len);
size_t res_len = (kt->bits + 7) / 8;
if(len != 0 && c == NULL) {
ret = krb5_enomem(context);
goto out;
}
memcpy(c, constant, len);
(*et->encrypt)(context, key, c, len, 1, 0, NULL);
k = malloc(res_len);
if(res_len != 0 && k == NULL) {
free(c);
ret = krb5_enomem(context);
goto out;
}
ret = _krb5_n_fold(c, len, k, res_len);
free(c);
if (ret) {
krb5_enomem(context);
goto out;
}
}
/* XXX keytype dependent post-processing */
switch(kt->type) {
case KRB5_ENCTYPE_OLD_DES3_CBC_SHA1:
_krb5_DES3_random_to_key(context, key->key, k, nblocks * et->blocksize);
break;
case ETYPE_DES3_CBC_SHA1:
case KRB5_ENCTYPE_AES128_CTS_HMAC_SHA1_96:
case KRB5_ENCTYPE_AES256_CTS_HMAC_SHA1_96:
memcpy(key->key->keyvalue.data, k, key->key->keyvalue.length);
break;
default:
ret = KRB5_CRYPTO_INTERNAL;
krb5_set_error_message(context, ret,
N_("derive_key() called with unknown keytype (%u)", ""),
kt->type);
break;
}
out:
if (key->schedule) {
free_key_schedule(context, key, et);
key->schedule = NULL;
}
if (k) {
memset(k, 0, nblocks * et->blocksize);
free(k);
}
return ret;
}
static struct _krb5_key_data *
_new_derived_key(krb5_crypto crypto, unsigned usage)
{
struct _krb5_key_usage *d = crypto->key_usage;
d = realloc(d, (crypto->num_key_usage + 1) * sizeof(*d));
if(d == NULL)
return NULL;
crypto->key_usage = d;
d += crypto->num_key_usage++;
memset(d, 0, sizeof(*d));
d->usage = usage;
return &d->key;
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_derive_key(krb5_context context,
const krb5_keyblock *key,
krb5_enctype etype,
const void *constant,
size_t constant_len,
krb5_keyblock **derived_key)
{
krb5_error_code ret;
struct _krb5_encryption_type *et;
struct _krb5_key_data d;
*derived_key = NULL;
et = _krb5_find_enctype (etype);
if (et == NULL) {
return unsupported_enctype (context, etype);
}
ret = krb5_copy_keyblock(context, key, &d.key);
if (ret)
return ret;
d.schedule = NULL;
ret = _krb5_derive_key(context, et, &d, constant, constant_len);
if (ret == 0)
ret = krb5_copy_keyblock(context, d.key, derived_key);
_krb5_free_key_data(context, &d, et);
return ret;
}
static krb5_error_code
_get_derived_key(krb5_context context,
krb5_crypto crypto,
unsigned usage,
struct _krb5_key_data **key)
{
int i;
struct _krb5_key_data *d;
unsigned char constant[5];
for(i = 0; i < crypto->num_key_usage; i++)
if(crypto->key_usage[i].usage == usage) {
*key = &crypto->key_usage[i].key;
return 0;
}
d = _new_derived_key(crypto, usage);
if (d == NULL)
return krb5_enomem(context);
krb5_copy_keyblock(context, crypto->key.key, &d->key);
_krb5_put_int(constant, usage, 5);
_krb5_derive_key(context, crypto->et, d, constant, sizeof(constant));
*key = d;
return 0;
}
/**
* Create a crypto context used for all encryption and signature
* operation. The encryption type to use is taken from the key, but
* can be overridden with the enctype parameter. This can be useful
* for encryptions types which is compatiable (DES for example).
*
* To free the crypto context, use krb5_crypto_destroy().
*
* @param context Kerberos context
* @param key the key block information with all key data
* @param etype the encryption type
* @param crypto the resulting crypto context
*
* @return Return an error code or 0.
*
* @ingroup krb5_crypto
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_crypto_init(krb5_context context,
const krb5_keyblock *key,
krb5_enctype etype,
krb5_crypto *crypto)
{
krb5_error_code ret;
ALLOC(*crypto, 1);
if (*crypto == NULL)
return krb5_enomem(context);
if(etype == (krb5_enctype)ETYPE_NULL)
etype = key->keytype;
(*crypto)->et = _krb5_find_enctype(etype);
if((*crypto)->et == NULL || ((*crypto)->et->flags & F_DISABLED)) {
free(*crypto);
*crypto = NULL;
return unsupported_enctype(context, etype);
}
if((*crypto)->et->keytype->size != key->keyvalue.length) {
free(*crypto);
*crypto = NULL;
krb5_set_error_message (context, KRB5_BAD_KEYSIZE,
"encryption key has bad length");
return KRB5_BAD_KEYSIZE;
}
ret = krb5_copy_keyblock(context, key, &(*crypto)->key.key);
if(ret) {
free(*crypto);
*crypto = NULL;
return ret;
}
(*crypto)->key.schedule = NULL;
(*crypto)->num_key_usage = 0;
(*crypto)->key_usage = NULL;
return 0;
}
static void
free_key_schedule(krb5_context context,
struct _krb5_key_data *key,
struct _krb5_encryption_type *et)
{
if (et->keytype->cleanup)
(*et->keytype->cleanup)(context, key);
memset(key->schedule->data, 0, key->schedule->length);
krb5_free_data(context, key->schedule);
}
KRB5_LIB_FUNCTION void KRB5_LIB_CALL
_krb5_free_key_data(krb5_context context, struct _krb5_key_data *key,
struct _krb5_encryption_type *et)
{
krb5_free_keyblock(context, key->key);
if(key->schedule) {
free_key_schedule(context, key, et);
key->schedule = NULL;
}
}
static void
free_key_usage(krb5_context context, struct _krb5_key_usage *ku,
struct _krb5_encryption_type *et)
{
_krb5_free_key_data(context, &ku->key, et);
}
/**
* Free a crypto context created by krb5_crypto_init().
*
* @param context Kerberos context
* @param crypto crypto context to free
*
* @return Return an error code or 0.
*
* @ingroup krb5_crypto
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_crypto_destroy(krb5_context context,
krb5_crypto crypto)
{
int i;
for(i = 0; i < crypto->num_key_usage; i++)
free_key_usage(context, &crypto->key_usage[i], crypto->et);
free(crypto->key_usage);
_krb5_free_key_data(context, &crypto->key, crypto->et);
free (crypto);
return 0;
}
/**
* Return the blocksize used algorithm referenced by the crypto context
*
* @param context Kerberos context
* @param crypto crypto context to query
* @param blocksize the resulting blocksize
*
* @return Return an error code or 0.
*
* @ingroup krb5_crypto
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_crypto_getblocksize(krb5_context context,
krb5_crypto crypto,
size_t *blocksize)
{
*blocksize = crypto->et->blocksize;
return 0;
}
/**
* Return the encryption type used by the crypto context
*
* @param context Kerberos context
* @param crypto crypto context to query
* @param enctype the resulting encryption type
*
* @return Return an error code or 0.
*
* @ingroup krb5_crypto
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_crypto_getenctype(krb5_context context,
krb5_crypto crypto,
krb5_enctype *enctype)
{
*enctype = crypto->et->type;
return 0;
}
/**
* Return the padding size used by the crypto context
*
* @param context Kerberos context
* @param crypto crypto context to query
* @param padsize the return padding size
*
* @return Return an error code or 0.
*
* @ingroup krb5_crypto
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_crypto_getpadsize(krb5_context context,
krb5_crypto crypto,
size_t *padsize)
{
*padsize = crypto->et->padsize;
return 0;
}
/**
* Return the confounder size used by the crypto context
*
* @param context Kerberos context
* @param crypto crypto context to query
* @param confoundersize the returned confounder size
*
* @return Return an error code or 0.
*
* @ingroup krb5_crypto
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_crypto_getconfoundersize(krb5_context context,
krb5_crypto crypto,
size_t *confoundersize)
{
*confoundersize = crypto->et->confoundersize;
return 0;
}
/**
* Disable encryption type
*
* @param context Kerberos 5 context
* @param enctype encryption type to disable
*
* @return Return an error code or 0.
*
* @ingroup krb5_crypto
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_enctype_disable(krb5_context context,
krb5_enctype enctype)
{
struct _krb5_encryption_type *et = _krb5_find_enctype(enctype);
if(et == NULL) {
if (context)
krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
N_("encryption type %d not supported", ""),
enctype);
return KRB5_PROG_ETYPE_NOSUPP;
}
et->flags |= F_DISABLED;
return 0;
}
/**
* Enable encryption type
*
* @param context Kerberos 5 context
* @param enctype encryption type to enable
*
* @return Return an error code or 0.
*
* @ingroup krb5_crypto
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_enctype_enable(krb5_context context,
krb5_enctype enctype)
{
struct _krb5_encryption_type *et = _krb5_find_enctype(enctype);
if(et == NULL) {
if (context)
krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
N_("encryption type %d not supported", ""),
enctype);
return KRB5_PROG_ETYPE_NOSUPP;
}
et->flags &= ~F_DISABLED;
return 0;
}
/**
* Enable or disable all weak encryption types
*
* @param context Kerberos 5 context
* @param enable true to enable, false to disable
*
* @return Return an error code or 0.
*
* @ingroup krb5_crypto
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_allow_weak_crypto(krb5_context context,
krb5_boolean enable)
{
int i;
for(i = 0; i < _krb5_num_etypes; i++)
if(_krb5_etypes[i]->flags & F_WEAK) {
if(enable)
_krb5_etypes[i]->flags &= ~F_DISABLED;
else
_krb5_etypes[i]->flags |= F_DISABLED;
}
return 0;
}
/**
* Returns is the encryption is strong or weak
*
* @param context Kerberos 5 context
* @param enctype encryption type to probe
*
* @return Returns true if encryption type is weak or is not supported.
*
* @ingroup krb5_crypto
*/
KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
krb5_is_enctype_weak(krb5_context context, krb5_enctype enctype)
{
struct _krb5_encryption_type *et = _krb5_find_enctype(enctype);
if(et == NULL || (et->flags & F_WEAK))
return TRUE;
return FALSE;
}
static size_t
wrapped_length (krb5_context context,
krb5_crypto crypto,
size_t data_len)
{
struct _krb5_encryption_type *et = crypto->et;
size_t padsize = et->padsize;
size_t checksumsize = CHECKSUMSIZE(et->checksum);
size_t res;
res = et->confoundersize + checksumsize + data_len;
res = (res + padsize - 1) / padsize * padsize;
return res;
}
static size_t
wrapped_length_dervied (krb5_context context,
krb5_crypto crypto,
size_t data_len)
{
struct _krb5_encryption_type *et = crypto->et;
size_t padsize = et->padsize;
size_t res;
res = et->confoundersize + data_len;
res = (res + padsize - 1) / padsize * padsize;
if (et->keyed_checksum)
res += et->keyed_checksum->checksumsize;
else
res += et->checksum->checksumsize;
return res;
}
/*
* Return the size of an encrypted packet of length `data_len'
*/
KRB5_LIB_FUNCTION size_t KRB5_LIB_CALL
krb5_get_wrapped_length (krb5_context context,
krb5_crypto crypto,
size_t data_len)
{
if (derived_crypto (context, crypto))
return wrapped_length_dervied (context, crypto, data_len);
else
return wrapped_length (context, crypto, data_len);
}
/*
* Return the size of an encrypted packet of length `data_len'
*/
static size_t
crypto_overhead (krb5_context context,
krb5_crypto crypto)
{
struct _krb5_encryption_type *et = crypto->et;
size_t res;
res = CHECKSUMSIZE(et->checksum);
res += et->confoundersize;
if (et->padsize > 1)
res += et->padsize;
return res;
}
static size_t
crypto_overhead_dervied (krb5_context context,
krb5_crypto crypto)
{
struct _krb5_encryption_type *et = crypto->et;
size_t res;
if (et->keyed_checksum)
res = CHECKSUMSIZE(et->keyed_checksum);
else
res = CHECKSUMSIZE(et->checksum);
res += et->confoundersize;
if (et->padsize > 1)
res += et->padsize;
return res;
}
KRB5_LIB_FUNCTION size_t KRB5_LIB_CALL
krb5_crypto_overhead (krb5_context context, krb5_crypto crypto)
{
if (derived_crypto (context, crypto))
return crypto_overhead_dervied (context, crypto);
else
return crypto_overhead (context, crypto);
}
/**
* Converts the random bytestring to a protocol key according to
* Kerberos crypto frame work. It may be assumed that all the bits of
* the input string are equally random, even though the entropy
* present in the random source may be limited.
*
* @param context Kerberos 5 context
* @param type the enctype resulting key will be of
* @param data input random data to convert to a key
* @param size size of input random data, at least krb5_enctype_keysize() long
* @param key key, output key, free with krb5_free_keyblock_contents()
*
* @return Return an error code or 0.
*
* @ingroup krb5_crypto
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_random_to_key(krb5_context context,
krb5_enctype type,
const void *data,
size_t size,
krb5_keyblock *key)
{
krb5_error_code ret;
struct _krb5_encryption_type *et = _krb5_find_enctype(type);
if(et == NULL) {
krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
N_("encryption type %d not supported", ""),
type);
return KRB5_PROG_ETYPE_NOSUPP;
}
if ((et->keytype->bits + 7) / 8 > size) {
krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
N_("encryption key %s needs %d bytes "
"of random to make an encryption key "
"out of it", ""),
et->name, (int)et->keytype->size);
return KRB5_PROG_ETYPE_NOSUPP;
}
ret = krb5_data_alloc(&key->keyvalue, et->keytype->size);
if(ret)
return ret;
key->keytype = type;
if (et->keytype->random_to_key)
(*et->keytype->random_to_key)(context, key, data, size);
else
memcpy(key->keyvalue.data, data, et->keytype->size);
return 0;
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_crypto_prf_length(krb5_context context,
krb5_enctype type,
size_t *length)
{
struct _krb5_encryption_type *et = _krb5_find_enctype(type);
if(et == NULL || et->prf_length == 0) {
krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
N_("encryption type %d not supported", ""),
type);
return KRB5_PROG_ETYPE_NOSUPP;
}
*length = et->prf_length;
return 0;
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_crypto_prf(krb5_context context,
const krb5_crypto crypto,
const krb5_data *input,
krb5_data *output)
{
struct _krb5_encryption_type *et = crypto->et;
krb5_data_zero(output);
if(et->prf == NULL) {
krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
"kerberos prf for %s not supported",
et->name);
return KRB5_PROG_ETYPE_NOSUPP;
}
return (*et->prf)(context, crypto, input, output);
}
static krb5_error_code
krb5_crypto_prfplus(krb5_context context,
const krb5_crypto crypto,
const krb5_data *input,
size_t length,
krb5_data *output)
{
krb5_error_code ret;
krb5_data input2;
unsigned char i = 1;
unsigned char *p;
krb5_data_zero(&input2);
krb5_data_zero(output);
krb5_clear_error_message(context);
ret = krb5_data_alloc(output, length);
if (ret) goto out;
ret = krb5_data_alloc(&input2, input->length + 1);
if (ret) goto out;
krb5_clear_error_message(context);
memcpy(((unsigned char *)input2.data) + 1, input->data, input->length);
p = output->data;
while (length) {
krb5_data block;
((unsigned char *)input2.data)[0] = i++;
ret = krb5_crypto_prf(context, crypto, &input2, &block);
if (ret)
goto out;
if (block.length < length) {
memcpy(p, block.data, block.length);
length -= block.length;
} else {
memcpy(p, block.data, length);
length = 0;
}
p += block.length;
krb5_data_free(&block);
}
out:
krb5_data_free(&input2);
if (ret)
krb5_data_free(output);
return ret;
}
/**
* The FX-CF2 key derivation function, used in FAST and preauth framework.
*
* @param context Kerberos 5 context
* @param crypto1 first key to combine
* @param crypto2 second key to combine
* @param pepper1 factor to combine with first key to garante uniqueness
* @param pepper2 factor to combine with second key to garante uniqueness
* @param enctype the encryption type of the resulting key
* @param res allocated key, free with krb5_free_keyblock_contents()
*
* @return Return an error code or 0.
*
* @ingroup krb5_crypto
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_crypto_fx_cf2(krb5_context context,
const krb5_crypto crypto1,
const krb5_crypto crypto2,
krb5_data *pepper1,
krb5_data *pepper2,
krb5_enctype enctype,
krb5_keyblock *res)
{
krb5_error_code ret;
krb5_data os1, os2;
size_t i, keysize;
memset(res, 0, sizeof(*res));
krb5_data_zero(&os1);
krb5_data_zero(&os2);
ret = krb5_enctype_keybits(context, enctype, &keysize);
if (ret)
return ret;
keysize = (keysize + 7) / 8;
ret = krb5_crypto_prfplus(context, crypto1, pepper1, keysize, &os1);
if (ret)
goto out;
ret = krb5_crypto_prfplus(context, crypto2, pepper2, keysize, &os2);
if (ret)
goto out;
res->keytype = enctype;
{
unsigned char *p1 = os1.data, *p2 = os2.data;
for (i = 0; i < keysize; i++)
p1[i] ^= p2[i];
}
ret = krb5_random_to_key(context, enctype, os1.data, keysize, res);
out:
krb5_data_free(&os1);
krb5_data_free(&os2);
return ret;
}
#ifndef HEIMDAL_SMALLER
/**
* Deprecated: keytypes doesn't exists, they are really enctypes.
*
* @ingroup krb5_deprecated
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_keytype_to_enctypes (krb5_context context,
krb5_keytype keytype,
unsigned *len,
krb5_enctype **val)
KRB5_DEPRECATED_FUNCTION("Use X instead")
{
int i;
unsigned n = 0;
krb5_enctype *ret;
for (i = _krb5_num_etypes - 1; i >= 0; --i) {
if (_krb5_etypes[i]->keytype->type == keytype
&& !(_krb5_etypes[i]->flags & F_PSEUDO)
&& krb5_enctype_valid(context, _krb5_etypes[i]->type) == 0)
++n;
}
if (n == 0) {
krb5_set_error_message(context, KRB5_PROG_KEYTYPE_NOSUPP,
"Keytype have no mapping");
return KRB5_PROG_KEYTYPE_NOSUPP;
}
ret = malloc(n * sizeof(*ret));
if (ret == NULL && n != 0)
return krb5_enomem(context);
n = 0;
for (i = _krb5_num_etypes - 1; i >= 0; --i) {
if (_krb5_etypes[i]->keytype->type == keytype
&& !(_krb5_etypes[i]->flags & F_PSEUDO)
&& krb5_enctype_valid(context, _krb5_etypes[i]->type) == 0)
ret[n++] = _krb5_etypes[i]->type;
}
*len = n;
*val = ret;
return 0;
}
/**
* Deprecated: keytypes doesn't exists, they are really enctypes.
*
* @ingroup krb5_deprecated
*/
/* if two enctypes have compatible keys */
KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
krb5_enctypes_compatible_keys(krb5_context context,
krb5_enctype etype1,
krb5_enctype etype2)
KRB5_DEPRECATED_FUNCTION("Use X instead")
{
struct _krb5_encryption_type *e1 = _krb5_find_enctype(etype1);
struct _krb5_encryption_type *e2 = _krb5_find_enctype(etype2);
return e1 != NULL && e2 != NULL && e1->keytype == e2->keytype;
}
#endif /* HEIMDAL_SMALLER */
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