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EVP_KEYMGMT(3) OpenSSL EVP_KEYMGMT(3)
NAME
EVP_KEYMGMT, EVP_KEYMGMT_fetch, EVP_KEYMGMT_up_ref, EVP_KEYMGMT_free,
EVP_KEYMGMT_get0_provider, EVP_KEYMGMT_is_a,
EVP_KEYMGMT_get0_description, EVP_KEYMGMT_get0_name,
EVP_KEYMGMT_do_all_provided, EVP_KEYMGMT_names_do_all,
EVP_KEYMGMT_gettable_params, EVP_KEYMGMT_settable_params,
EVP_KEYMGMT_gen_settable_params - EVP key management routines
LIBRARY
libcrypto, -lcrypto
SYNOPSIS
#include <openssl/evp.h>
typedef struct evp_keymgmt_st EVP_KEYMGMT;
EVP_KEYMGMT *EVP_KEYMGMT_fetch(OSSL_LIB_CTX *ctx, const char *algorithm,
const char *properties);
int EVP_KEYMGMT_up_ref(EVP_KEYMGMT *keymgmt);
void EVP_KEYMGMT_free(EVP_KEYMGMT *keymgmt);
const OSSL_PROVIDER *EVP_KEYMGMT_get0_provider(const EVP_KEYMGMT *keymgmt);
int EVP_KEYMGMT_is_a(const EVP_KEYMGMT *keymgmt, const char *name);
const char *EVP_KEYMGMT_get0_name(const EVP_KEYMGMT *keymgmt);
const char *EVP_KEYMGMT_get0_description(const EVP_KEYMGMT *keymgmt);
void EVP_KEYMGMT_do_all_provided(OSSL_LIB_CTX *libctx,
void (*fn)(EVP_KEYMGMT *keymgmt, void *arg),
void *arg);
int EVP_KEYMGMT_names_do_all(const EVP_KEYMGMT *keymgmt,
void (*fn)(const char *name, void *data),
void *data);
const OSSL_PARAM *EVP_KEYMGMT_gettable_params(const EVP_KEYMGMT *keymgmt);
const OSSL_PARAM *EVP_KEYMGMT_settable_params(const EVP_KEYMGMT *keymgmt);
const OSSL_PARAM *EVP_KEYMGMT_gen_settable_params(const EVP_KEYMGMT *keymgmt);
DESCRIPTION
EVP_KEYMGMT is a method object that represents key management
implementations for different cryptographic algorithms. This method
object provides functionality to have providers import key material
from the outside, as well as export key material to the outside. Most
of the functionality can only be used internally and has no public
interface, this object is simply passed into other functions when
needed.
EVP_KEYMGMT_fetch() looks for an algorithm within the provider that has
been loaded into the OSSL_LIB_CTX given by ctx, having the name given
by algorithm and the properties given by properties.
EVP_KEYMGMT_up_ref() increments the reference count for the given
EVP_KEYMGMT keymgmt.
EVP_KEYMGMT_free() decrements the reference count for the given
EVP_KEYMGMT keymgmt, and when the count reaches zero, frees it.
EVP_KEYMGMT_get0_provider() returns the provider that has this
particular implementation.
EVP_KEYMGMT_is_a() checks if keymgmt is an implementation of an
algorithm that's identifiable with name.
EVP_KEYMGMT_get0_name() returns the algorithm name from the provided
implementation for the given keymgmt. Note that the keymgmt 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 keymgmt object and should not be freed by the
caller.
EVP_KEYMGMT_names_do_all() traverses all names for the keymgmt, and
calls fn with each name and data.
EVP_KEYMGMT_get0_description() returns a description of the keymgmt,
meant for display and human consumption. The description is at the
discretion of the keymgmt implementation.
EVP_KEYMGMT_do_all_provided() traverses all key keymgmt implementations
by all activated providers in the library context libctx, and for each
of the implementations, calls fn with the implementation method and
data as arguments.
EVP_KEYMGMT_gettable_params() and EVP_KEYMGMT_settable_params() return
a constant OSSL_PARAM(3) array that describes the names and types of
key parameters that can be retrieved or set.
EVP_KEYMGMT_gettable_params() is used by EVP_PKEY_gettable_params(3).
EVP_KEYMGMT_gen_settable_params() returns a constant OSSL_PARAM(3)
array that describes the names and types of key generation parameters
that can be set via EVP_PKEY_CTX_set_params(3).
NOTES
EVP_KEYMGMT_fetch() may be called implicitly by other fetching
functions, using the same library context and properties. Any other
API that uses keys will typically do this.
RETURN VALUES
EVP_KEYMGMT_fetch() returns a pointer to the key management
implementation represented by an EVP_KEYMGMT object, or NULL on error.
EVP_KEYMGMT_up_ref() returns 1 on success, or 0 on error.
EVP_KEYMGMT_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_KEYMGMT_free() doesn't return any value.
EVP_KEYMGMT_get0_provider() returns a pointer to a provider object, or
NULL on error.
EVP_KEYMGMT_is_a() returns 1 of keymgmt was identifiable, otherwise 0.
EVP_KEYMGMT_get0_name() returns the algorithm name, or NULL on error.
EVP_KEYMGMT_get0_description() returns a pointer to a description, or
NULL if there isn't one.
EVP_KEYMGMT_gettable_params(), EVP_KEYMGMT_settable_params() and
EVP_KEYMGMT_gen_settable_params() return a constant OSSL_PARAM(3) array
or NULL on error.
SEE ALSO
EVP_MD_fetch(3), OSSL_LIB_CTX(3)
HISTORY
The functions described here were added in OpenSSL 3.0.
COPYRIGHT
Copyright 2019-2023 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>.
3.0.12 2023-10-25 EVP_KEYMGMT(3)