213 lines
7.2 KiB
Groff
Executable File
213 lines
7.2 KiB
Groff
Executable File
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.\" ========================================================================
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.\"
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.IX Title "EVP_KEYEXCH_FREE 3"
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.TH EVP_KEYEXCH_FREE 3 "2020-03-02" "3.0.0-dev" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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EVP_KEYEXCH_fetch, EVP_KEYEXCH_free, EVP_KEYEXCH_up_ref, EVP_KEYEXCH_provider,
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EVP_KEYEXCH_is_a, EVP_KEYEXCH_do_all_provided,
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EVP_KEYEXCH_number, EVP_KEYEXCH_names_do_all
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\&\- Functions to manage EVP_KEYEXCH algorithm objects
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/evp.h>
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\&
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\& EVP_KEYEXCH *EVP_KEYEXCH_fetch(OPENSSL_CTX *ctx, const char *algorithm,
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\& const char *properties);
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\& void EVP_KEYEXCH_free(EVP_KEYEXCH *exchange);
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\& int EVP_KEYEXCH_up_ref(EVP_KEYEXCH *exchange);
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\& OSSL_PROVIDER *EVP_KEYEXCH_provider(const EVP_KEYEXCH *exchange);
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\& int EVP_KEYEXCH_is_a(const EVP_KEYEXCH *exchange, const char *name);
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\& int EVP_KEYEXCH_number(const EVP_KEYEXCH *exchange);
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\& void EVP_KEYEXCH_do_all_provided(OPENSSL_CTX *libctx,
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\& void (*fn)(EVP_KEYEXCH *exchange, void *arg),
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\& void *arg);
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\& void EVP_KEYEXCH_names_do_all(const EVP_KEYEXCH *exchange,
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\& void (*fn)(const char *name, void *data),
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\& void *data);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIEVP_KEYEXCH_fetch()\fR fetches the key exchange implementation for the given
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\&\fIalgorithm\fR from any provider offering it, within the criteria given
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by the \fIproperties\fR.
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See \*(L"Fetching algorithms\*(R" in \fIprovider\fR\|(7) for further information.
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.PP
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The returned value must eventually be freed with \fIEVP_KEYEXCH_free()\fR.
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.PP
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\&\fIEVP_KEYEXCH_free()\fR decrements the reference count for the \fB\s-1EVP_KEYEXCH\s0\fR
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structure. Typically this structure will have been obtained from an earlier call
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to \fIEVP_KEYEXCH_fetch()\fR. If the reference count drops to 0 then the
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structure is freed.
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.PP
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\&\fIEVP_KEYEXCH_up_ref()\fR increments the reference count for an \fB\s-1EVP_KEYEXCH\s0\fR
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structure.
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.PP
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\&\fIEVP_KEYEXCH_provider()\fR returns the provider that \fIexchange\fR was fetched from.
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.PP
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\&\fIEVP_KEYEXCH_is_a()\fR checks if \fIexchange\fR is an implementation of an
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algorithm that's identifiable with \fIname\fR.
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.PP
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\&\fIEVP_KEYEXCH_number()\fR returns the internal dynamic number assigned to
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the \fIexchange\fR.
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.PP
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\&\fIEVP_KEYEXCH_names_do_all()\fR traverses all names for the \fIexchange\fR, and
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calls \fIfn\fR with each name and \fIdata\fR.
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.PP
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\&\fIEVP_KEYEXCH_do_all_provided()\fR traverses all key exchange implementations by
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all activated providers in the library context \fIlibctx\fR, and for each
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of the implementations, calls \fIfn\fR with the implementation method and
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\&\fIdata\fR as arguments.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIEVP_KEYEXCH_fetch()\fR returns a pointer to a \fB\s-1EVP_KEYEXCH\s0\fR for success
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or \s-1NULL\s0 for failure.
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.PP
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\&\fIEVP_KEYEXCH_up_ref()\fR returns 1 for success or 0 otherwise.
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.PP
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\&\fIEVP_KEYEXCH_is_a()\fR returns 1 of \fIexchange\fR was identifiable,
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otherwise 0.
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.PP
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\&\fIEVP_KEYEXCH_number()\fR returns an integer.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\*(L"Fetching algorithms\*(R" in \fIprovider\fR\|(7), \s-1\fIOSSL_PROVIDER\s0\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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The functions described here were added in OpenSSL 3.0.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). 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 \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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