mirror of
https://github.com/openssl/openssl.git
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145 lines
5.2 KiB
Plaintext
145 lines
5.2 KiB
Plaintext
=pod
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=head1 NAME
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OSSL_ENCODER,
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OSSL_ENCODER_fetch,
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OSSL_ENCODER_up_ref,
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OSSL_ENCODER_free,
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OSSL_ENCODER_get0_provider,
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OSSL_ENCODER_get0_properties,
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OSSL_ENCODER_is_a,
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OSSL_ENCODER_get0_name,
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OSSL_ENCODER_get0_description,
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OSSL_ENCODER_do_all_provided,
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OSSL_ENCODER_names_do_all,
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OSSL_ENCODER_gettable_params,
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OSSL_ENCODER_get_params
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- Encoder method routines
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=head1 SYNOPSIS
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#include <openssl/encoder.h>
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typedef struct ossl_encoder_st OSSL_ENCODER;
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OSSL_ENCODER *OSSL_ENCODER_fetch(OSSL_LIB_CTX *ctx, const char *name,
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const char *properties);
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int OSSL_ENCODER_up_ref(OSSL_ENCODER *encoder);
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void OSSL_ENCODER_free(OSSL_ENCODER *encoder);
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const OSSL_PROVIDER *OSSL_ENCODER_get0_provider(const OSSL_ENCODER *encoder);
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const char *OSSL_ENCODER_get0_properties(const OSSL_ENCODER *encoder);
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int OSSL_ENCODER_is_a(const OSSL_ENCODER *encoder, const char *name);
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const char *OSSL_ENCODER_get0_name(const OSSL_ENCODER *encoder);
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const char *OSSL_ENCODER_get0_description(const OSSL_ENCODER *encoder);
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void OSSL_ENCODER_do_all_provided(OSSL_LIB_CTX *libctx,
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void (*fn)(OSSL_ENCODER *encoder, void *arg),
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void *arg);
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int OSSL_ENCODER_names_do_all(const OSSL_ENCODER *encoder,
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void (*fn)(const char *name, void *data),
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void *data);
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const OSSL_PARAM *OSSL_ENCODER_gettable_params(OSSL_ENCODER *encoder);
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int OSSL_ENCODER_get_params(OSSL_ENCODER_CTX *ctx, const OSSL_PARAM params[]);
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=head1 DESCRIPTION
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B<OSSL_ENCODER> is a method for encoders, which know how to
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encode an object of some kind to a encoded form, such as PEM,
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DER, or even human readable text.
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OSSL_ENCODER_fetch() looks for an algorithm within the provider that
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has been loaded into the B<OSSL_LIB_CTX> given by I<ctx>, having the
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name given by I<name> and the properties given by I<properties>.
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The I<name> determines what type of object the fetched encoder
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method is expected to be able to encode, and the properties are
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used to determine the expected output type.
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For known properties and the values they may have, please have a look
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in L<provider-encoder(7)/Names and properties>.
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OSSL_ENCODER_up_ref() increments the reference count for the given
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I<encoder>.
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OSSL_ENCODER_free() decrements the reference count for the given
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I<encoder>, and when the count reaches zero, frees it.
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OSSL_ENCODER_get0_provider() returns the provider of the given
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I<encoder>.
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OSSL_ENCODER_get0_properties() returns the property definition associated
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with the given I<encoder>.
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OSSL_ENCODER_is_a() checks if I<encoder> is an implementation of an
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algorithm that's identifiable with I<name>.
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OSSL_ENCODER_get0_name() returns the name used to fetch the given I<encoder>.
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OSSL_ENCODER_get0_description() returns a description of the I<loader>, meant
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for display and human consumption. The description is at the discretion of the
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I<loader> implementation.
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OSSL_ENCODER_names_do_all() traverses all names for the given
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I<encoder>, and calls I<fn> with each name and I<data> as arguments.
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OSSL_ENCODER_do_all_provided() traverses all encoder
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implementations by all activated providers in the library context
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I<libctx>, and for each of the implementations, calls I<fn> with the
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implementation method and I<arg> as arguments.
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OSSL_ENCODER_gettable_params() returns an L<OSSL_PARAM(3)>
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array of parameter descriptors.
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OSSL_ENCODER_get_params() attempts to get parameters specified
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with an L<OSSL_PARAM(3)> array I<params>. Parameters that the
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implementation doesn't recognise should be ignored.
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=head1 RETURN VALUES
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OSSL_ENCODER_fetch() returns a pointer to the key management
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implementation represented by an OSSL_ENCODER object, or NULL on
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error.
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OSSL_ENCODER_up_ref() returns 1 on success, or 0 on error.
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OSSL_ENCODER_free() doesn't return any value.
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OSSL_ENCODER_get0_provider() returns a pointer to a provider object, or
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NULL on error.
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OSSL_ENCODER_get0_properties() returns a pointer to a property
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definition string, or NULL on error.
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OSSL_ENCODER_is_a() returns 1 of I<encoder> was identifiable,
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otherwise 0.
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OSSL_ENCODER_get0_name() returns the algorithm name from the provided
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implementation for the given I<encoder>. Note that the I<encoder> 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<encoder> object and should not be freed by the caller.
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OSSL_ENCODER_get0_description() returns a pointer to a description, or NULL if
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there isn't one.
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OSSL_ENCODER_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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=head1 SEE ALSO
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L<provider(7)>, L<OSSL_ENCODER_CTX(3)>, L<OSSL_ENCODER_to_bio(3)>,
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L<OSSL_ENCODER_CTX_new_for_pkey(3)>, L<OSSL_LIB_CTX(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 2019-2022 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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