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ece9304c96
Fixes #12455 Reviewed-by: Paul Dale <paul.dale@oracle.com> (Merged from https://github.com/openssl/openssl/pull/12660)
143 lines
4.6 KiB
Plaintext
143 lines
4.6 KiB
Plaintext
=pod
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=head1 NAME
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OSSL_DECODER,
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OSSL_DECODER_fetch,
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OSSL_DECODER_up_ref,
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OSSL_DECODER_free,
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OSSL_DECODER_provider,
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OSSL_DECODER_properties,
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OSSL_DECODER_is_a,
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OSSL_DECODER_number,
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OSSL_DECODER_do_all_provided,
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OSSL_DECODER_names_do_all,
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OSSL_DECODER_gettable_params,
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OSSL_DECODER_get_params
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- Decoder method routines
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=head1 SYNOPSIS
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#include <openssl/decoder.h>
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typedef struct ossl_decoder_st OSSL_DECODER;
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OSSL_DECODER *OSSL_DECODER_fetch(OPENSSL_CTX *ctx, const char *name,
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const char *properties);
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int OSSL_DECODER_up_ref(OSSL_DECODER *decoder);
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void OSSL_DECODER_free(OSSL_DECODER *decoder);
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const OSSL_PROVIDER *OSSL_DECODER_provider(const OSSL_DECODER *decoder);
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const char *OSSL_DECODER_properties(const OSSL_DECODER *decoder);
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int OSSL_DECODER_is_a(const OSSL_DECODER *decoder, const char *name);
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int OSSL_DECODER_number(const OSSL_DECODER *decoder);
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void OSSL_DECODER_do_all_provided(OPENSSL_CTX *libctx,
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void (*fn)(OSSL_DECODER *decoder, void *arg),
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void *arg);
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void OSSL_DECODER_names_do_all(const OSSL_DECODER *decoder,
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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_DECODER_gettable_params(OSSL_DECODER *decoder);
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int OSSL_DECODER_get_params(OSSL_DECODER_CTX *ctx, const OSSL_PARAM params[]);
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=head1 DESCRIPTION
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B<OSSL_DECODER> is a method for decoders, which know how to
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decode encoded data into an object of some type that the rest
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of OpenSSL knows how to handle.
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OSSL_DECODER_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 decoder
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method is expected to be able to decode, 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_DECODER_up_ref() increments the reference count for the given
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I<decoder>.
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OSSL_DECODER_free() decrements the reference count for the given
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I<decoder>, and when the count reaches zero, frees it.
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OSSL_DECODER_provider() returns the provider of the given
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I<decoder>.
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OSSL_DECODER_properties() returns the property definition associated
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with the given I<decoder>.
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OSSL_DECODER_is_a() checks if I<decoder> is an implementation
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of an algorithm that's identifiable with I<name>.
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OSSL_DECODER_number() returns the internal dynamic number assigned
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to the given I<decoder>.
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OSSL_DECODER_names_do_all() traverses all names for the given
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I<decoder>, and calls I<fn> with each name and I<data>.
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OSSL_DECODER_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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OSSL_DECODER_gettable_params() returns an L<OSSL_PARAM(3)>
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array of parameter descriptors.
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OSSL_DECODER_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_DECODER_fetch() returns a pointer to an OSSL_DECODER object,
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or NULL on error.
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OSSL_DECODER_up_ref() returns 1 on success, or 0 on error.
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OSSL_DECODER_free() doesn't return any value.
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OSSL_DECODER_provider() returns a pointer to a provider object, or
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NULL on error.
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OSSL_DECODER_properties() returns a pointer to a property
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definition string, or NULL on error.
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OSSL_DECODER_is_a() returns 1 if I<decoder> was identifiable,
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otherwise 0.
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OSSL_DECODER_number() returns an integer.
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=head1 NOTES
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OSSL_DECODER_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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=begin comment TODO(3.0) Add examples!
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=head1 EXAMPLES
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Text, because pod2xxx doesn't like empty sections
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=end comment
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=head1 SEE ALSO
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L<provider(7)>, L<OSSL_DECODER_CTX(3)>, L<OSSL_DECODER_from_bio(3)>,
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L<OSSL_DECODER_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 2020 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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