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94 lines
2.9 KiB
Plaintext
94 lines
2.9 KiB
Plaintext
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=pod
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=head1 NAME
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OSSL_ENCODER_CTX,
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OSSL_ENCODER_CTX_new,
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OSSL_ENCODER_CTX_get_encoder,
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OSSL_ENCODER_settable_ctx_params,
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OSSL_ENCODER_CTX_set_params,
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OSSL_ENCODER_CTX_free
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- Encoder context routines
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=head1 SYNOPSIS
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#include <openssl/encoder.h>
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typedef struct ossl_encoder_ctx_st OSSL_ENCODER_CTX;
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OSSL_ENCODER_CTX *OSSL_ENCODER_CTX_new(OSSL_ENCODER *encoder);
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const OSSL_ENCODER *OSSL_ENCODER_CTX_get_encoder(OSSL_ENCODER_CTX *ctx);
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const OSSL_PARAM *OSSL_ENCODER_settable_ctx_params(OSSL_ENCODER *encoder);
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int OSSL_ENCODER_CTX_set_params(OSSL_ENCODER_CTX *ctx,
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const OSSL_PARAM params[]);
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void OSSL_ENCODER_CTX_free(OSSL_ENCODER_CTX *ctx);
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=head1 DESCRIPTION
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B<OSSL_ENCODER_CTX> is a context with which B<OSSL_ENCODER>
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operations are performed. The context typically holds values, both
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internal and supplied by the application, which are useful for the
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implementations supplied by providers.
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OSSL_ENCODER_CTX_new() creates a B<OSSL_ENCODER_CTX> associated
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with the encoder I<encoder>. NULL is a valid I<encoder>, the context will
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be created anyway, it's just not very useful. This is intentional, to
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distinguish between errors in allocating the context or assigning it
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values on one hand, and the lack of encoder support on the other.
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=begin comment
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The above distinction makes it possible for other routines to sense if
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they need to report an error or fall back on other methods to
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encode.
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=end comment
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OSSL_ENCODER_CTX_get_encoder() gets the encoder method
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currently associated with the context I<ctx>.
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OSSL_ENCODER_settable_ctx_params() returns an L<OSSL_PARAM(3)>
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array of parameter descriptors.
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OSSL_ENCODER_CTX_set_params() attempts to set 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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OSSL_ENCODER_CTX_free() frees the given context I<ctx>.
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=head1 RETURN VALUES
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OSSL_ENCODER_CTX_new() returns a pointer to a
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B<OSSL_ENCODER_CTX>, or NULL if the context structure couldn't be
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allocated.
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OSSL_ENCODER_CTX_get_encoder() returns a pointer to the
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encoder method associated with I<ctx>. NULL is a valid return
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value and signifies that there is no associated encoder method.
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OSSL_ENCODER_settable_ctx_params() returns an L<OSSL_PARAM(3)>
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array, or NULL if none is available.
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OSSL_ENCODER_CTX_set_params() returns 1 if all recognised
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parameters were valid, or 0 if one of them was invalid or caused some
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other failure in the implementation.
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=head1 SEE ALSO
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L<provider(7)>, L<OSSL_ENCODER(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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