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/*
* Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <openssl/core_names.h>
#include "internal/cryptlib.h"
#include "internal/nelem.h"
#include "crypto/evp.h"
#include "crypto/asn1.h"
#include "internal/core.h"
#include "internal/provider.h"
#include "evp_local.h"
/*
* match_type() checks if two EVP_KEYMGMT are matching key types. This
* function assumes that the caller has made all the necessary NULL checks.
*/
static int match_type(const EVP_KEYMGMT *keymgmt1, const EVP_KEYMGMT *keymgmt2)
{
const OSSL_PROVIDER *prov2 = EVP_KEYMGMT_provider(keymgmt2);
const char *name2 = evp_first_name(prov2, EVP_KEYMGMT_number(keymgmt2));
return EVP_KEYMGMT_is_a(keymgmt1, name2);
}
struct import_data_st {
EVP_KEYMGMT *keymgmt;
void *keydata;
int selection;
};
static int try_import(const OSSL_PARAM params[], void *arg)
{
struct import_data_st *data = arg;
/*
* It's fine if there was no data to transfer, we just end up with an
* empty destination key.
*/
if (params[0].key == NULL)
return 1;
/* Just in time creation of keydata, if needed */
if (data->keydata == NULL
&& (data->keydata = evp_keymgmt_newdata(data->keymgmt)) == NULL) {
ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
return 0;
}
return evp_keymgmt_import(data->keymgmt, data->keydata, data->selection,
params);
}
void *evp_keymgmt_util_export_to_provider(EVP_PKEY *pk, EVP_KEYMGMT *keymgmt)
{
struct import_data_st import_data;
size_t i = 0;
/* Export to where? */
if (keymgmt == NULL)
return NULL;
/* If we have an unassigned key, give up */
if (pk->keydata == NULL)
return NULL;
/* If |keymgmt| matches the "origin" |keymgmt|, no more to do */
if (pk->keymgmt == keymgmt)
return pk->keydata;
/* If this key is already exported to |keymgmt|, no more to do */
i = evp_keymgmt_util_find_operation_cache_index(pk, keymgmt);
if (i < OSSL_NELEM(pk->operation_cache)
&& pk->operation_cache[i].keymgmt != NULL)
return pk->operation_cache[i].keydata;
/* If the "origin" |keymgmt| doesn't support exporting, give up */
/*
* TODO(3.0) consider an evp_keymgmt_export() return value that indicates
* that the method is unsupported.
*/
if (pk->keymgmt->export == NULL)
return NULL;
/* Check that we have found an empty slot in the export cache */
/*
* TODO(3.0) Right now, we assume we have ample space. We will have to
* think about a cache aging scheme, though, if |i| indexes outside the
* array.
*/
if (!ossl_assert(i < OSSL_NELEM(pk->operation_cache)))
return NULL;
/*
* Make sure that the type of the keymgmt to export to matches the type
* of the "origin"
*/
if (!ossl_assert(match_type(pk->keymgmt, keymgmt)))
return NULL;
/*
* We look at the already cached provider keys, and import from the
* first that supports it (i.e. use its export function), and export
* the imported data to the new provider.
*/
/* Setup for the export callback */
import_data.keydata = NULL; /* try_import will create it */
import_data.keymgmt = keymgmt;
import_data.selection = OSSL_KEYMGMT_SELECT_ALL;
/*
* The export function calls the callback (try_import), which does the
* import for us. If successful, we're done.
*/
if (!evp_keymgmt_export(pk->keymgmt, pk->keydata, OSSL_KEYMGMT_SELECT_ALL,
&try_import, &import_data)) {
/* If there was an error, bail out */
evp_keymgmt_freedata(keymgmt, import_data.keydata);
return NULL;
}
/* Add the new export to the operation cache */
if (!evp_keymgmt_util_cache_keydata(pk, i, keymgmt, import_data.keydata)) {
evp_keymgmt_freedata(keymgmt, import_data.keydata);
return NULL;
}
return import_data.keydata;
}
void evp_keymgmt_util_clear_operation_cache(EVP_PKEY *pk)
{
size_t i, end = OSSL_NELEM(pk->operation_cache);
if (pk != NULL) {
for (i = 0; i < end && pk->operation_cache[i].keymgmt != NULL; i++) {
EVP_KEYMGMT *keymgmt = pk->operation_cache[i].keymgmt;
void *keydata = pk->operation_cache[i].keydata;
pk->operation_cache[i].keymgmt = NULL;
pk->operation_cache[i].keydata = NULL;
evp_keymgmt_freedata(keymgmt, keydata);
EVP_KEYMGMT_free(keymgmt);
}
}
}
size_t evp_keymgmt_util_find_operation_cache_index(EVP_PKEY *pk,
EVP_KEYMGMT *keymgmt)
{
size_t i, end = OSSL_NELEM(pk->operation_cache);
for (i = 0; i < end && pk->operation_cache[i].keymgmt != NULL; i++) {
if (keymgmt == pk->operation_cache[i].keymgmt)
break;
}
return i;
}
int evp_keymgmt_util_cache_keydata(EVP_PKEY *pk, size_t index,
EVP_KEYMGMT *keymgmt, void *keydata)
{
if (keydata != NULL) {
if (!EVP_KEYMGMT_up_ref(keymgmt))
return 0;
pk->operation_cache[index].keydata = keydata;
pk->operation_cache[index].keymgmt = keymgmt;
}
return 1;
}
void evp_keymgmt_util_cache_keyinfo(EVP_PKEY *pk)
{
/*
* Cache information about the provider "origin" key.
*
* This services functions like EVP_PKEY_size, EVP_PKEY_bits, etc
*/
if (pk->keydata != NULL) {
int bits = 0;
int security_bits = 0;
int size = 0;
OSSL_PARAM params[4];
params[0] = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_BITS, &bits);
params[1] = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_SECURITY_BITS,
&security_bits);
params[2] = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_MAX_SIZE, &size);
params[3] = OSSL_PARAM_construct_end();
if (evp_keymgmt_get_params(pk->keymgmt, pk->keydata, params)) {
pk->cache.size = size;
pk->cache.bits = bits;
pk->cache.security_bits = security_bits;
}
}
}
void *evp_keymgmt_util_fromdata(EVP_PKEY *target, EVP_KEYMGMT *keymgmt,
int selection, const OSSL_PARAM params[])
{
void *keydata = NULL;
if ((keydata = evp_keymgmt_newdata(keymgmt)) == NULL
|| !evp_keymgmt_import(keymgmt, keydata, selection, params)
|| !EVP_PKEY_set_type_by_keymgmt(target, keymgmt)) {
evp_keymgmt_freedata(keymgmt, keydata);
keydata = NULL;
}
if (keydata != NULL) {
target->keydata = keydata;
evp_keymgmt_util_cache_keyinfo(target);
}
return keydata;
}
int evp_keymgmt_util_has(EVP_PKEY *pk, int selection)
{
/* Check if key is even assigned */
if (pk->keymgmt == NULL)
return 0;
return evp_keymgmt_has(pk->keymgmt, pk->keydata, selection);
}
/*
* evp_keymgmt_util_match() doesn't just look at the provider side "origin",
* but also in the operation cache to see if there's any common keymgmt that
* supplies OP_keymgmt_match.
*
* evp_keymgmt_util_match() adheres to the return values that EVP_PKEY_cmp()
* and EVP_PKEY_cmp_parameters() return, i.e.:
*
* 1 same key
* 0 not same key
* -1 not same key type
* -2 unsupported operation
*/
int evp_keymgmt_util_match(EVP_PKEY *pk1, EVP_PKEY *pk2, <
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