mirror of https://github.com/openssl/openssl.git
191 lines
6.4 KiB
Plaintext
191 lines
6.4 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_get0_provider,
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OSSL_DECODER_get0_properties,
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OSSL_DECODER_is_a,
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OSSL_DECODER_get0_name,
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OSSL_DECODER_get0_description,
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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(OSSL_LIB_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_get0_provider(const OSSL_DECODER *decoder);
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const char *OSSL_DECODER_get0_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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const char *OSSL_DECODER_get0_name(const OSSL_DECODER *decoder);
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const char *OSSL_DECODER_get0_description(const OSSL_DECODER *decoder);
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void OSSL_DECODER_do_all_provided(OSSL_LIB_CTX *libctx,
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void (*fn)(OSSL_DECODER *decoder, void *arg),
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void *arg);
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int 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<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 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_get0_provider() returns the provider of the given
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I<decoder>.
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OSSL_DECODER_get0_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_get0_name() returns the name used to fetch the given I<decoder>.
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OSSL_DECODER_get0_description() returns a description of the I<decoder>, meant
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for display and human consumption. The description is at the discretion
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of the I<decoder> implementation.
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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> as arguments.
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OSSL_DECODER_do_all_provided() traverses all decoder
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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_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_get0_provider() returns a pointer to a provider object, or
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NULL on error.
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OSSL_DECODER_get0_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_get0_name() returns the algorithm name from the provided
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implementation for the given I<decoder>. Note that the I<decoder> 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<decoder> object and should not be freed by the caller.
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OSSL_DECODER_get0_description() returns a pointer to a decription, or NULL if
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there isn't one.
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OSSL_DECODER_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 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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=head1 EXAMPLES
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To list all decoders in a provider to a bio_out:
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static void collect_decoders(OSSL_DECODER *decoder, void *stack)
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{
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STACK_OF(OSSL_DECODER) *decoder_stack = stack;
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sk_OSSL_DECODER_push(decoder_stack, decoder);
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OSSL_DECODER_up_ref(decoder);
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}
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void print_name(const char *name, void *vdata)
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{
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BIO *bio = vdata;
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BIO_printf(bio, "%s ", name);
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}
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STACK_OF(OSSL_DECODER) *decoders;
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int i;
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decoders = sk_OSSL_DECODER_new_null();
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BIO_printf(bio_out, "DECODERs provided by %s:\n", provider);
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OSSL_DECODER_do_all_provided(NULL, collect_decoders,
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decoders);
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for (i = 0; i < sk_OSSL_DECODER_num(decoders); i++) {
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OSSL_DECODER *decoder = sk_OSSL_DECODER_value(decoders, i);
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if (strcmp(OSSL_PROVIDER_get0_name(OSSL_DECODER_get0_provider(decoder)),
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provider) != 0)
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continue;
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if (OSSL_DECODER_names_do_all(decoder, print_name, bio_out))
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BIO_printf(bio_out, "\n");
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}
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sk_OSSL_DECODER_pop_free(decoders, OSSL_DECODER_free);
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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_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 2020-2021 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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