mirror of
https://github.com/openssl/openssl.git
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113 lines
4.8 KiB
Plaintext
113 lines
4.8 KiB
Plaintext
=pod
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=head1 NAME
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EVP_ASYM_CIPHER_fetch, EVP_ASYM_CIPHER_free, EVP_ASYM_CIPHER_up_ref,
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EVP_ASYM_CIPHER_is_a, EVP_ASYM_CIPHER_get0_provider,
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EVP_ASYM_CIPHER_do_all_provided, EVP_ASYM_CIPHER_names_do_all,
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EVP_ASYM_CIPHER_get0_name, EVP_ASYM_CIPHER_get0_description,
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EVP_ASYM_CIPHER_gettable_ctx_params, EVP_ASYM_CIPHER_settable_ctx_params
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- Functions to manage EVP_ASYM_CIPHER algorithm objects
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=head1 SYNOPSIS
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#include <openssl/evp.h>
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EVP_ASYM_CIPHER *EVP_ASYM_CIPHER_fetch(OSSL_LIB_CTX *ctx, const char *algorithm,
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const char *properties);
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void EVP_ASYM_CIPHER_free(EVP_ASYM_CIPHER *cipher);
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int EVP_ASYM_CIPHER_up_ref(EVP_ASYM_CIPHER *cipher);
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const char *EVP_ASYM_CIPHER_get0_name(const EVP_ASYM_CIPHER *cipher);
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int EVP_ASYM_CIPHER_is_a(const EVP_ASYM_CIPHER *cipher, const char *name);
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OSSL_PROVIDER *EVP_ASYM_CIPHER_get0_provider(const EVP_ASYM_CIPHER *cipher);
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void EVP_ASYM_CIPHER_do_all_provided(OSSL_LIB_CTX *libctx,
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void (*fn)(EVP_ASYM_CIPHER *cipher,
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void *arg),
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void *arg);
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int EVP_ASYM_CIPHER_names_do_all(const EVP_ASYM_CIPHER *cipher,
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void (*fn)(const char *name, void *data),
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void *data);
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const char *EVP_ASYM_CIPHER_get0_description(const EVP_ASYM_CIPHER *cipher);
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const OSSL_PARAM *EVP_ASYM_CIPHER_gettable_ctx_params(const EVP_ASYM_CIPHER *cip);
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const OSSL_PARAM *EVP_ASYM_CIPHER_settable_ctx_params(const EVP_ASYM_CIPHER *cip);
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=head1 DESCRIPTION
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EVP_ASYM_CIPHER_fetch() fetches the implementation for the given
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B<algorithm> from any provider offering it, within the criteria given
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by the B<properties> and in the scope of the given library context B<ctx> (see
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L<OSSL_LIB_CTX(3)>). The algorithm will be one offering functions for performing
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asymmetric cipher related tasks such as asymmetric encryption and decryption.
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See L<crypto(7)/ALGORITHM FETCHING> for further information.
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The returned value must eventually be freed with EVP_ASYM_CIPHER_free().
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EVP_ASYM_CIPHER_free() decrements the reference count for the B<EVP_ASYM_CIPHER>
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structure. Typically this structure will have been obtained from an earlier call
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to EVP_ASYM_CIPHER_fetch(). If the reference count drops to 0 then the
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structure is freed. If the argument is NULL, nothing is done.
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EVP_ASYM_CIPHER_up_ref() increments the reference count for an
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B<EVP_ASYM_CIPHER> structure.
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EVP_ASYM_CIPHER_is_a() returns 1 if I<cipher> is an implementation of an
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algorithm that's identifiable with I<name>, otherwise 0.
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EVP_ASYM_CIPHER_get0_provider() returns the provider that I<cipher> was
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fetched from.
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EVP_ASYM_CIPHER_do_all_provided() traverses all EVP_ASYM_CIPHERs implemented by
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all activated providers in the given library context I<libctx>, and for each of
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the implementations, calls the given function I<fn> with the implementation
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method and the given I<arg> as argument.
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EVP_ASYM_CIPHER_get0_name() returns the algorithm name from the provided
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implementation for the given I<cipher>. Note that the I<cipher> may have
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multiple synonyms associated with it. In this case the first name from the
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algorithm definition is returned. Ownership of the returned string is retained
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by the I<cipher> object and should not be freed by the caller.
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EVP_ASYM_CIPHER_names_do_all() traverses all names for I<cipher>, and calls
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I<fn> with each name and I<data>.
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EVP_ASYM_CIPHER_get0_description() returns a description of the I<cipher>,
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meant for display and human consumption. The description is at the
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discretion of the I<cipher> implementation.
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EVP_ASYM_CIPHER_gettable_ctx_params() and EVP_ASYM_CIPHER_settable_ctx_params()
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return a constant L<OSSL_PARAM(3)> array that describes the names and types of key
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parameters that can be retrieved or set by a key encryption algorithm using
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L<EVP_PKEY_CTX_get_params(3)> and L<EVP_PKEY_CTX_set_params(3)>.
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=head1 RETURN VALUES
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EVP_ASYM_CIPHER_fetch() returns a pointer to an B<EVP_ASYM_CIPHER> for success
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or B<NULL> for failure.
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EVP_ASYM_CIPHER_up_ref() returns 1 for success or 0 otherwise.
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EVP_ASYM_CIPHER_names_do_all() returns 1 if the callback was called for all
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names. A return value of 0 means that the callback was not called for any names.
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EVP_ASYM_CIPHER_gettable_ctx_params() and EVP_ASYM_CIPHER_settable_ctx_params()
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return a constant L<OSSL_PARAM(3)> array or NULL on error.
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=head1 SEE ALSO
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L<crypto(7)/ALGORITHM FETCHING>, L<OSSL_PROVIDER(3)>
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=head1 HISTORY
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The functions described here were added in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2019-2024 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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