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/*
* Copyright 2019-2021 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/evp.h>
#include <openssl/err.h>
#include <openssl/core.h>
#include <openssl/core_dispatch.h>
#include <openssl/kdf.h>
#include "internal/provider.h"
#include "internal/core.h"
#include "crypto/evp.h"
#include "evp_local.h"
static int evp_kdf_up_ref(void *vkdf)
{
EVP_KDF *kdf = (EVP_KDF *)vkdf;
int ref = 0;
CRYPTO_UP_REF(&kdf->refcnt, &ref, kdf->lock);
return 1;
}
static void evp_kdf_free(void *vkdf)
{
EVP_KDF *kdf = (EVP_KDF *)vkdf;
int ref = 0;
if (kdf == NULL)
return;
CRYPTO_DOWN_REF(&kdf->refcnt, &ref, kdf->lock);
if (ref > 0)
return;
OPENSSL_free(kdf->type_name);
ossl_provider_free(kdf->prov);
CRYPTO_THREAD_lock_free(kdf->lock);
OPENSSL_free(kdf);
}
static void *evp_kdf_new(void)
{
EVP_KDF *kdf = NULL;
if ((kdf = OPENSSL_zalloc(sizeof(*kdf))) == NULL
|| (kdf->lock = CRYPTO_THREAD_lock_new()) == NULL) {
OPENSSL_free(kdf);
return NULL;
}
kdf->refcnt = 1;
return kdf;
}
static void *evp_kdf_from_algorithm(int name_id,
const OSSL_ALGORITHM *algodef,
OSSL_PROVIDER *prov)
{
const OSSL_DISPATCH *fns = algodef->implementation;
EVP_KDF *kdf = NULL;
int fnkdfcnt = 0, fnctxcnt = 0;
if ((kdf = evp_kdf_new()) == NULL) {
ERR_raise(ERR_LIB_EVP, ERR_R_EVP_LIB);
return NULL;
}
kdf->name_id = name_id;
if ((kdf->type_name = ossl_algorithm_get1_first_name(algodef)) == NULL) {
evp_kdf_free(kdf);
return NULL;
}
kdf->description = algodef->algorithm_description;
for (; fns->function_id != 0; fns++) {
switch (fns->function_id) {
case OSSL_FUNC_KDF_NEWCTX:
if (kdf->newctx != NULL)
break;
kdf->newctx = OSSL_FUNC_kdf_newctx(fns);
fnctxcnt++;
break;
case OSSL_FUNC_KDF_DUPCTX:
if (kdf->dupctx != NULL)
break;
kdf->dupctx = OSSL_FUNC_kdf_dupctx(fns);
break;
case OSSL_FUNC_KDF_FREECTX:
if (kdf->freectx != NULL)
break;
kdf->freectx = OSSL_FUNC_kdf_freectx(fns);
fnctxcnt++;
break;
case OSSL_FUNC_KDF_RESET:
if (kdf->reset != NULL)
break;
kdf->reset = OSSL_FUNC_kdf_reset(fns);
break;
case OSSL_FUNC_KDF_DERIVE:
if (kdf->derive != NULL)
break;
kdf->derive = OSSL_FUNC_kdf_derive(fns);
fnkdfcnt++;
break;
case OSSL_FUNC_KDF_GETTABLE_PARAMS:
if (kdf->gettable_params != NULL)
break;
kdf->gettable_params =
OSSL_FUNC_kdf_gettable_params(fns);
break;
case OSSL_FUNC_KDF_GETTABLE_CTX_PARAMS:
if (kdf->gettable_ctx_params != NULL)
break;
kdf->gettable_ctx_params =
OSSL_FUNC_kdf_gettable_ctx_params(fns);
break;
case OSSL_FUNC_KDF_SETTABLE_CTX_PARAMS:
if (kdf->settable_ctx_params != NULL)
break;
kdf->settable_ctx_params =
OSSL_FUNC_kdf_settable_ctx_params(fns);
break;
case OSSL_FUNC_KDF_GET_PARAMS:
if (kdf->get_params != NULL)
break;
kdf->get_params = OSSL_FUNC_kdf_get_params(fns);
break;
case OSSL_FUNC_KDF_GET_CTX_PARAMS:
if (kdf->get_ctx_params != NULL)
break;
kdf->get_ctx_params = OSSL_FUNC_kdf_get_ctx_params(fns);
break;
case OSSL_FUNC_KDF_SET_CTX_PARAMS:
if (kdf->set_ctx_params != NULL)
break;
kdf->set_ctx_params = OSSL_FUNC_kdf_set_ctx_params(fns);
break;
}
}
if (fnkdfcnt != 1 || fnctxcnt != 2) {
/*
* In order to be a consistent set of functions we must have at least
* a derive function, and a complete set of context management
* functions.
*/
evp_kdf_free(kdf);
ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS);
return NULL;
}
kdf->prov = prov;
if (prov != NULL)
ossl_provider_up_ref(prov);
return kdf;
}
EVP_KDF *EVP_KDF_fetch(OSSL_LIB_CTX *libctx, const char *algorithm,
const char *properties)
{
return evp_generic_fetch(libctx, OSSL_OP_KDF, algorithm, properties,
evp_kdf_from_algorithm, evp_kdf_up_ref,
evp_kdf_free);
}
int EVP_KDF_up_ref(EVP_KDF *kdf)
{
return evp_kdf_up_ref(kdf);
}
void EVP_KDF_free(EVP_KDF *kdf)
{
evp_kdf_free(kdf);
}
const OSSL_PARAM *EVP_KDF_gettable_params(const EVP_KDF *kdf)
{
if (kdf->gettable_params == NULL)
return NULL;
return kdf->gettable_params(ossl_provider_ctx(EVP_KDF_get0_provider(kdf)));
}
const OSSL_PARAM *EVP_KDF_gettable_ctx_params(const EVP_KDF *kdf)
{
void *alg;
if (kdf->gettable_ctx_params == NULL)
return NULL;
alg = ossl_provider_ctx(EVP_KDF_get0_provider(kdf));
return kdf->gettable_ctx_params(NULL, alg);
}
const OSSL_PARAM *EVP_KDF_settable_ctx_params(const EVP_KDF *kdf)
{
void *alg;
if (kdf->settable_ctx_params == NULL)
return NULL;
alg = ossl_provider_ctx(EVP_KDF_get0_provider(kdf));
return kdf->settable_ctx_params(NULL, alg);
}
const OSSL_PARAM *EVP_KDF_CTX_gettable_params(EVP_KDF_CTX *ctx)
{
void *alg;
if (ctx->meth->gettable_ctx_params == NULL)
return NULL;
alg = ossl_provider_ctx(EVP_KDF_get0_provider(ctx->meth));
return ctx->meth->gettable_ctx_params(ctx->algctx, alg);
}
const OSSL_PARAM *EVP_KDF_CTX_settable_params(EVP_KDF_CTX *ctx)
{
void *alg;
if (ctx->meth->settable_ctx_params == NULL)
return NULL;
alg = ossl_provider_ctx(EVP_KDF_get0_provider(ctx->meth));
return ctx->meth->settable_ctx_params(ctx->algctx, alg);
}
void EVP_KDF_do_all_provided(OSSL_LIB_CTX *libctx,
void (*fn)(EVP_KDF *kdf, void *arg),
void *arg)
{
evp_generic_do_all(libctx, OSSL_OP_KDF,
(void (*)(void *, void *))fn, arg,
evp_kdf_from_algorithm, evp_kdf_up_ref, evp_kdf_free);
}
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