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/*
* Copyright 2018-2021 The OpenSSL Project Authors. All Rights Reserved.
* Copyright (c) 2018-2019, Oracle and/or its affiliates. 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 <stdio.h>
#include <stdlib.h>
#include "internal/cryptlib.h"
#include <openssl/evp.h>
#include <openssl/kdf.h>
#include <openssl/core.h>
#include <openssl/core_names.h>
#include "crypto/evp.h"
#include "internal/numbers.h"
#include "internal/provider.h"
#include "evp_local.h"
EVP_KDF_CTX *EVP_KDF_CTX_new(EVP_KDF *kdf)
{
EVP_KDF_CTX *ctx = NULL;
if (kdf == NULL)
return NULL;
ctx = OPENSSL_zalloc(sizeof(EVP_KDF_CTX));
if (ctx == NULL
|| (ctx->algctx = kdf->newctx(ossl_provider_ctx(kdf->prov))) == NULL
|| !EVP_KDF_up_ref(kdf)) {
ERR_raise(ERR_LIB_EVP, ERR_R_EVP_LIB);
if (ctx != NULL)
kdf->freectx(ctx->algctx);
OPENSSL_free(ctx);
ctx = NULL;
} else {
ctx->meth = kdf;
}
return ctx;
}
void EVP_KDF_CTX_free(EVP_KDF_CTX *ctx)
{
if (ctx == NULL)
return;
ctx->meth->freectx(ctx->algctx);
ctx->algctx = NULL;
EVP_KDF_free(ctx->meth);
OPENSSL_free(ctx);
}
EVP_KDF_CTX *EVP_KDF_CTX_dup(const EVP_KDF_CTX *src)
{
EVP_KDF_CTX *dst;
if (src == NULL || src->algctx == NULL || src->meth->dupctx == NULL)
return NULL;
dst = OPENSSL_malloc(sizeof(*dst));
if (dst == NULL)
return NULL;
memcpy(dst, src, sizeof(*dst));
if (!EVP_KDF_up_ref(dst->meth)) {
ERR_raise(ERR_LIB_EVP, ERR_R_EVP_LIB);
OPENSSL_free(dst);
return NULL;
}
dst->algctx = src->meth->dupctx(src->algctx);
if (dst->algctx == NULL) {
EVP_KDF_CTX_free(dst);
return NULL;
}
return dst;
}
int evp_kdf_get_number(const EVP_KDF *kdf)
{
return kdf->name_id;
}
const char *EVP_KDF_get0_name(const EVP_KDF *kdf)
{
return kdf->type_name;
}
const char *EVP_KDF_get0_description(const EVP_KDF *kdf)
{
return kdf->description;
}
int EVP_KDF_is_a(const EVP_KDF *kdf, const char *name)
{
return kdf != NULL && evp_is_a(kdf->prov, kdf->name_id, NULL, name);
}
const OSSL_PROVIDER *EVP_KDF_get0_provider(const EVP_KDF *kdf)
{
return kdf->prov;
}
const EVP_KDF *EVP_KDF_CTX_kdf(EVP_KDF_CTX *ctx)
{
return ctx->meth;
}
void EVP_KDF_CTX_reset(EVP_KDF_CTX *ctx)
{
if (ctx == NULL)
return;
if (ctx->meth->reset != NULL)
ctx->meth->reset(ctx->algctx);
}
size_t EVP_KDF_CTX_get_kdf_size(EVP_KDF_CTX *ctx)
{
OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
size_t s = 0;
if (ctx == NULL)
return 0;
*params = OSSL_PARAM_construct_size_t(OSSL_KDF_PARAM_SIZE, &s);
if (ctx->meth->get_ctx_params != NULL
&& ctx->meth->get_ctx_params(ctx->algctx, params))
return s;
if (ctx->meth->get_params != NULL
&& ctx->meth->get_params(params))
return s;
return 0;
}
int EVP_KDF_derive(EVP_KDF_CTX *ctx, unsigned char *key, size_t keylen,
const OSSL_PARAM params[])
{
if (ctx == NULL)
return 0;
return ctx->meth->derive(ctx->algctx, key, keylen, params);
}
/*
* The {get,set}_params functions return 1 if there is no corresponding
* function in the implementation. This is the same as if there was one,
* but it didn't recognise any of the given params, i.e. nothing in the
* bag of parameters was useful.
*/
int EVP_KDF_get_params(EVP_KDF *kdf, OSSL_PARAM params[])
{
if (kdf->get_params != NULL)
return kdf->get_params(params);
return 1;
}
int EVP_KDF_CTX_get_params(EVP_KDF_CTX *ctx, OSSL_PARAM params[])
{
if (ctx->meth->get_ctx_params != NULL)
return ctx->meth->get_ctx_params(ctx->algctx, params);
return 1;
}
int EVP_KDF_CTX_set_params(EVP_KDF_CTX *ctx, const OSSL_PARAM params[])
{
if (ctx->meth->set_ctx_params != NULL)
return ctx->meth->set_ctx_params(ctx->algctx, params);
return 1;
}
int EVP_KDF_names_do_all(const EVP_KDF *kdf,
void (*fn)(const char *name, void *data),
void *data)
{
if (kdf->prov != NULL)
return evp_names_do_all(kdf->prov, kdf->name_id, fn, data);
return 1;
}
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