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https://github.com/openssl/openssl.git
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127 lines
4.1 KiB
Plaintext
127 lines
4.1 KiB
Plaintext
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=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_provider,
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OSSL_ENCODER_properties,
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OSSL_ENCODER_is_a,
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OSSL_ENCODER_number,
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OSSL_ENCODER_do_all_provided,
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OSSL_ENCODER_names_do_all
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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(OPENSSL_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_provider(const OSSL_ENCODER *encoder);
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const char *OSSL_ENCODER_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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int OSSL_ENCODER_number(const OSSL_ENCODER *encoder);
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void OSSL_ENCODER_do_all_provided(OPENSSL_CTX *libctx,
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void (*fn)(OSSL_ENCODER *encoder, void *arg),
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void *arg);
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void 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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=head1 DESCRIPTION
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=for comment Future development should also talk about decoding
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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<OPENSSL_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_provider() returns the provider of the given
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I<encoder>.
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OSSL_ENCODER_provider() 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_number() returns the internal dynamic number assigned to
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the given I<encoder>.
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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>.
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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<data> as arguments.
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=head1 NOTES
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OSSL_ENCODER_fetch() may be called implicitly by other fetching
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functions, using the same library context and properties.
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Any other API that uses keys will typically do this.
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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_provider() returns a pointer to a provider object, or
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NULL on error.
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OSSL_ENCODER_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_number() returns an integer.
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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_by_EVP_PKEY(3)>, L<OPENSSL_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 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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