mirror of
https://github.com/openssl/openssl.git
synced 2024-12-15 06:01:37 +08:00
fecb3aae22
Reviewed-by: Tomas Mraz <tomas@openssl.org> Release: yes
191 lines
6.4 KiB
Plaintext
191 lines
6.4 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
OSSL_DECODER,
|
|
OSSL_DECODER_fetch,
|
|
OSSL_DECODER_up_ref,
|
|
OSSL_DECODER_free,
|
|
OSSL_DECODER_get0_provider,
|
|
OSSL_DECODER_get0_properties,
|
|
OSSL_DECODER_is_a,
|
|
OSSL_DECODER_get0_name,
|
|
OSSL_DECODER_get0_description,
|
|
OSSL_DECODER_do_all_provided,
|
|
OSSL_DECODER_names_do_all,
|
|
OSSL_DECODER_gettable_params,
|
|
OSSL_DECODER_get_params
|
|
- Decoder method routines
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/decoder.h>
|
|
|
|
typedef struct ossl_decoder_st OSSL_DECODER;
|
|
|
|
OSSL_DECODER *OSSL_DECODER_fetch(OSSL_LIB_CTX *ctx, const char *name,
|
|
const char *properties);
|
|
int OSSL_DECODER_up_ref(OSSL_DECODER *decoder);
|
|
void OSSL_DECODER_free(OSSL_DECODER *decoder);
|
|
const OSSL_PROVIDER *OSSL_DECODER_get0_provider(const OSSL_DECODER *decoder);
|
|
const char *OSSL_DECODER_get0_properties(const OSSL_DECODER *decoder);
|
|
int OSSL_DECODER_is_a(const OSSL_DECODER *decoder, const char *name);
|
|
const char *OSSL_DECODER_get0_name(const OSSL_DECODER *decoder);
|
|
const char *OSSL_DECODER_get0_description(const OSSL_DECODER *decoder);
|
|
void OSSL_DECODER_do_all_provided(OSSL_LIB_CTX *libctx,
|
|
void (*fn)(OSSL_DECODER *decoder, void *arg),
|
|
void *arg);
|
|
int OSSL_DECODER_names_do_all(const OSSL_DECODER *decoder,
|
|
void (*fn)(const char *name, void *data),
|
|
void *data);
|
|
const OSSL_PARAM *OSSL_DECODER_gettable_params(OSSL_DECODER *decoder);
|
|
int OSSL_DECODER_get_params(OSSL_DECODER_CTX *ctx, const OSSL_PARAM params[]);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
B<OSSL_DECODER> is a method for decoders, which know how to
|
|
decode encoded data into an object of some type that the rest
|
|
of OpenSSL knows how to handle.
|
|
|
|
OSSL_DECODER_fetch() looks for an algorithm within the provider that
|
|
has been loaded into the B<OSSL_LIB_CTX> given by I<ctx>, having the
|
|
name given by I<name> and the properties given by I<properties>.
|
|
The I<name> determines what type of object the fetched decoder
|
|
method is expected to be able to decode, and the properties are
|
|
used to determine the expected output type.
|
|
For known properties and the values they may have, please have a look
|
|
in L<provider-encoder(7)/Names and properties>.
|
|
|
|
OSSL_DECODER_up_ref() increments the reference count for the given
|
|
I<decoder>.
|
|
|
|
OSSL_DECODER_free() decrements the reference count for the given
|
|
I<decoder>, and when the count reaches zero, frees it.
|
|
|
|
OSSL_DECODER_get0_provider() returns the provider of the given
|
|
I<decoder>.
|
|
|
|
OSSL_DECODER_get0_properties() returns the property definition associated
|
|
with the given I<decoder>.
|
|
|
|
OSSL_DECODER_is_a() checks if I<decoder> is an implementation
|
|
of an algorithm that's identifiable with I<name>.
|
|
|
|
OSSL_DECODER_get0_name() returns the name used to fetch the given I<decoder>.
|
|
|
|
OSSL_DECODER_get0_description() returns a description of the I<decoder>, meant
|
|
for display and human consumption. The description is at the discretion
|
|
of the I<decoder> implementation.
|
|
|
|
OSSL_DECODER_names_do_all() traverses all names for the given
|
|
I<decoder>, and calls I<fn> with each name and I<data> as arguments.
|
|
|
|
OSSL_DECODER_do_all_provided() traverses all decoder
|
|
implementations by all activated providers in the library context
|
|
I<libctx>, and for each of the implementations, calls I<fn> with the
|
|
implementation method and I<arg> as arguments.
|
|
|
|
OSSL_DECODER_gettable_params() returns an L<OSSL_PARAM(3)>
|
|
array of parameter descriptors.
|
|
|
|
OSSL_DECODER_get_params() attempts to get parameters specified
|
|
with an L<OSSL_PARAM(3)> array I<params>. Parameters that the
|
|
implementation doesn't recognise should be ignored.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
OSSL_DECODER_fetch() returns a pointer to an OSSL_DECODER object,
|
|
or NULL on error.
|
|
|
|
OSSL_DECODER_up_ref() returns 1 on success, or 0 on error.
|
|
|
|
OSSL_DECODER_free() doesn't return any value.
|
|
|
|
OSSL_DECODER_get0_provider() returns a pointer to a provider object, or
|
|
NULL on error.
|
|
|
|
OSSL_DECODER_get0_properties() returns a pointer to a property
|
|
definition string, or NULL on error.
|
|
|
|
OSSL_DECODER_is_a() returns 1 if I<decoder> was identifiable,
|
|
otherwise 0.
|
|
|
|
OSSL_DECODER_get0_name() returns the algorithm name from the provided
|
|
implementation for the given I<decoder>. Note that the I<decoder> may have
|
|
multiple synonyms associated with it. In this case the first name from the
|
|
algorithm definition is returned. Ownership of the returned string is retained
|
|
by the I<decoder> object and should not be freed by the caller.
|
|
|
|
OSSL_DECODER_get0_description() returns a pointer to a description, or NULL if
|
|
there isn't one.
|
|
|
|
OSSL_DECODER_names_do_all() returns 1 if the callback was called for all
|
|
names. A return value of 0 means that the callback was not called for any names.
|
|
|
|
=head1 NOTES
|
|
|
|
OSSL_DECODER_fetch() may be called implicitly by other fetching
|
|
functions, using the same library context and properties.
|
|
Any other API that uses keys will typically do this.
|
|
|
|
=head1 EXAMPLES
|
|
|
|
To list all decoders in a provider to a bio_out:
|
|
|
|
static void collect_decoders(OSSL_DECODER *decoder, void *stack)
|
|
{
|
|
STACK_OF(OSSL_DECODER) *decoder_stack = stack;
|
|
|
|
sk_OSSL_DECODER_push(decoder_stack, decoder);
|
|
OSSL_DECODER_up_ref(decoder);
|
|
}
|
|
|
|
void print_name(const char *name, void *vdata)
|
|
{
|
|
BIO *bio = vdata;
|
|
|
|
BIO_printf(bio, "%s ", name);
|
|
}
|
|
|
|
|
|
STACK_OF(OSSL_DECODER) *decoders;
|
|
int i;
|
|
|
|
decoders = sk_OSSL_DECODER_new_null();
|
|
|
|
BIO_printf(bio_out, "DECODERs provided by %s:\n", provider);
|
|
OSSL_DECODER_do_all_provided(NULL, collect_decoders,
|
|
decoders);
|
|
|
|
for (i = 0; i < sk_OSSL_DECODER_num(decoders); i++) {
|
|
OSSL_DECODER *decoder = sk_OSSL_DECODER_value(decoders, i);
|
|
|
|
if (strcmp(OSSL_PROVIDER_get0_name(OSSL_DECODER_get0_provider(decoder)),
|
|
provider) != 0)
|
|
continue;
|
|
|
|
if (OSSL_DECODER_names_do_all(decoder, print_name, bio_out))
|
|
BIO_printf(bio_out, "\n");
|
|
}
|
|
sk_OSSL_DECODER_pop_free(decoders, OSSL_DECODER_free);
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<provider(7)>, L<OSSL_DECODER_CTX(3)>, L<OSSL_DECODER_from_bio(3)>,
|
|
L<OSSL_DECODER_CTX_new_for_pkey(3)>, L<OSSL_LIB_CTX(3)>
|
|
|
|
=head1 HISTORY
|
|
|
|
The functions described here were added in OpenSSL 3.0.
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2020-2022 The OpenSSL Project Authors. All Rights Reserved.
|
|
|
|
Licensed under the Apache License 2.0 (the "License"). You may not use
|
|
this file except in compliance with the License. You can obtain a copy
|
|
in the file LICENSE in the source distribution or at
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|