mirror of https://github.com/openssl/openssl
117 lines
4.7 KiB
Plaintext
117 lines
4.7 KiB
Plaintext
=pod
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=head1 NAME
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EVP_SIGNATURE,
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EVP_SIGNATURE_fetch, EVP_SIGNATURE_free, EVP_SIGNATURE_up_ref,
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EVP_SIGNATURE_is_a, EVP_SIGNATURE_get0_provider,
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EVP_SIGNATURE_do_all_provided, EVP_SIGNATURE_names_do_all,
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EVP_SIGNATURE_get0_name, EVP_SIGNATURE_get0_description,
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EVP_SIGNATURE_gettable_ctx_params, EVP_SIGNATURE_settable_ctx_params
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- Functions to manage EVP_SIGNATURE algorithm objects
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=head1 SYNOPSIS
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#include <openssl/evp.h>
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typedef struct evp_signature_st EVP_SIGNATURE;
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EVP_SIGNATURE *EVP_SIGNATURE_fetch(OSSL_LIB_CTX *ctx, const char *algorithm,
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const char *properties);
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void EVP_SIGNATURE_free(EVP_SIGNATURE *signature);
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int EVP_SIGNATURE_up_ref(EVP_SIGNATURE *signature);
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const char *EVP_SIGNATURE_get0_name(const EVP_SIGNATURE *signature);
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int EVP_SIGNATURE_is_a(const EVP_SIGNATURE *signature, const char *name);
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OSSL_PROVIDER *EVP_SIGNATURE_get0_provider(const EVP_SIGNATURE *signature);
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void EVP_SIGNATURE_do_all_provided(OSSL_LIB_CTX *libctx,
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void (*fn)(EVP_SIGNATURE *signature,
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void *arg),
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void *arg);
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int EVP_SIGNATURE_names_do_all(const EVP_SIGNATURE *signature,
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void (*fn)(const char *name, void *data),
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void *data);
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const char *EVP_SIGNATURE_get0_name(const EVP_SIGNATURE *signature);
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const char *EVP_SIGNATURE_get0_description(const EVP_SIGNATURE *signature);
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const OSSL_PARAM *EVP_SIGNATURE_gettable_ctx_params(const EVP_SIGNATURE *sig);
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const OSSL_PARAM *EVP_SIGNATURE_settable_ctx_params(const EVP_SIGNATURE *sig);
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=head1 DESCRIPTION
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EVP_SIGNATURE_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>.
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The algorithm will be one offering functions for performing signature related
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tasks such as signing and verifying.
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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_SIGNATURE_free().
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EVP_SIGNATURE_free() decrements the reference count for the B<EVP_SIGNATURE>
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structure. Typically this structure will have been obtained from an earlier call
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to EVP_SIGNATURE_fetch(). If the reference count drops to 0 then the
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structure is freed.
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EVP_SIGNATURE_up_ref() increments the reference count for an B<EVP_SIGNATURE>
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structure.
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EVP_SIGNATURE_is_a() returns 1 if I<signature> is an implementation of an
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algorithm that's identifiable with I<name>, otherwise 0.
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EVP_SIGNATURE_get0_provider() returns the provider that I<signature> was
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fetched from.
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EVP_SIGNATURE_do_all_provided() traverses all SIGNATURE implemented by all
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activated providers in the given library context I<libctx>, and for each of the
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implementations, calls the given function I<fn> with the implementation method
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and the given I<arg> as argument.
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EVP_SIGNATURE_get0_name() returns the algorithm name from the provided
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implementation for the given I<signature>. Note that the I<signature> 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<signature> object and should not be freed by the caller.
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EVP_SIGNATURE_names_do_all() traverses all names for I<signature>, and calls
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I<fn> with each name and I<data>.
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EVP_SIGNATURE_get0_description() returns a description of the I<signature>,
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meant for display and human consumption. The description is at the
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discretion of the I<signature> implementation.
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EVP_SIGNATURE_gettable_ctx_params() and EVP_SIGNATURE_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 signature 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_SIGNATURE_fetch() returns a pointer to an B<EVP_SIGNATURE> for success
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or B<NULL> for failure.
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EVP_SIGNATURE_up_ref() returns 1 for success or 0 otherwise.
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EVP_SIGNATURE_names_do_all() returns 1 if the callback was called for all names.
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A return value of 0 means that the callback was not called for any names.
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EVP_SIGNATURE_gettable_ctx_params() and EVP_SIGNATURE_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 2019-2023 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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