EVP_KEM_fetch, EVP_KEM_free, EVP_KEM_up_ref, EVP_KEM_get0_name, EVP_KEM_is_a, EVP_KEM_get0_provider, EVP_KEM_do_all_provided, EVP_KEM_names_do_all, EVP_KEM_get0_description, EVP_KEM_gettable_ctx_params, EVP_KEM_settable_ctx_params - Functions to manage EVP_KEM algorithm objects
#include <openssl/evp.h>
EVP_KEM *EVP_KEM_fetch(OSSL_LIB_CTX *ctx, const char *algorithm, const char *properties); void EVP_KEM_free(EVP_KEM *kem); int EVP_KEM_up_ref(EVP_KEM *kem); const char *EVP_KEM_get0_name(const EVP_KEM *kem); int EVP_KEM_is_a(const EVP_KEM *kem, const char *name); OSSL_PROVIDER *EVP_KEM_get0_provider(const EVP_KEM *kem); void EVP_KEM_do_all_provided(OSSL_LIB_CTX *libctx, void (*fn)(EVP_KEM *kem, void *arg), void *arg); int EVP_KEM_names_do_all(const EVP_KEM *kem, void (*fn)(const char *name, void *data), void *data); const char *EVP_KEM_get0_description(const EVP_KEM *kem); const OSSL_PARAM *EVP_KEM_gettable_ctx_params(const EVP_KEM *kem); const OSSL_PARAM *EVP_KEM_settable_ctx_params(const EVP_KEM *kem);
EVP_KEM_fetch()
fetches the implementation for the given algorithm from any
provider offering it, within the criteria given by the properties and in the
scope of the given library context ctx (see OSSL_LIB_CTX(3)). The algorithm
will be one offering functions for performing asymmetric kem related tasks such
as key encapsulation and decapsulation.
See crypto(7)/ALGORITHM FETCHING for further information.
The returned value must eventually be freed with EVP_KEM_free()
.
EVP_KEM_free()
decrements the reference count for the EVP_KEM structure.
Typically this structure will have been obtained from an earlier call to
EVP_KEM_fetch()
. If the reference count drops to 0 then the structure is freed.
EVP_KEM_up_ref()
increments the reference count for an EVP_KEM structure.
EVP_KEM_is_a()
returns 1 if kem is an implementation of an
algorithm that's identifiable with name, otherwise 0.
EVP_KEM_get0_provider() returns the provider that kem was fetched from.
EVP_KEM_do_all_provided()
traverses all EVP_KEMs implemented by all activated
providers in the given library context libctx, and for each of the
implementations, calls the given function fn with the implementation method
and the given arg as argument.
EVP_KEM_get0_name() returns the algorithm name from the provided implementation for the given kem. Note that the kem may have multiple synonyms associated with it. In this case the first name from the algorithm definition is returned. Ownership of the returned string is retained by the kem object and should not be freed by the caller.
EVP_KEM_names_do_all()
traverses all names for kem, and calls fn with
each name and data.
EVP_KEM_get0_description() returns a description of the kem, meant for display and human consumption. The description is at the discretion of the kem implementation.
EVP_KEM_gettable_ctx_params()
and EVP_KEM_settable_ctx_params()
return
a constant OSSL_PARAM(3) array that describes the names and types of key
parameters that can be retrieved or set by a key encapsulation algorithm using
EVP_PKEY_CTX_get_params(3) and EVP_PKEY_CTX_set_params(3).
EVP_KEM_fetch()
returns a pointer to an EVP_KEM for success or NULL for
failure.
EVP_KEM_up_ref()
returns 1 for success or 0 otherwise.
EVP_KEM_names_do_all()
returns 1 if the callback was called for all names. A
return value of 0 means that the callback was not called for any names.
EVP_KEM_gettable_ctx_params()
and EVP_KEM_settable_ctx_params()
return
a constant OSSL_PARAM(3) array or NULL on error.
crypto(7)/ALGORITHM FETCHING, OSSL_PROVIDER(3)
The functions described here were added in OpenSSL 3.0.
Copyright 2020-2022 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.