Android_verify/third_party/android-libs/share/man/man3/EVP_PKEY_todata.3ossl

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.IX Title "EVP_PKEY_TODATA 3ossl"
.TH EVP_PKEY_TODATA 3ossl "2024-09-03" "3.3.2" "OpenSSL"
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.nh
.SH "NAME"
EVP_PKEY_todata, EVP_PKEY_export
\&\- functions to return keys as an array of key parameters
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/evp.h>
\&
\& int EVP_PKEY_todata(const EVP_PKEY *pkey, int selection, OSSL_PARAM **params);
\& int EVP_PKEY_export(const EVP_PKEY *pkey, int selection,
\&                     OSSL_CALLBACK *export_cb, void *export_cbarg);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The functions described here are used to extract \fB\s-1EVP_PKEY\s0\fR key values as an
array of \s-1\fBOSSL_PARAM\s0\fR\|(3).
.PP
\&\fBEVP_PKEY_todata()\fR extracts values from a key \fIpkey\fR using the \fIselection\fR.
\&\fIselection\fR is described in \*(L"Selections\*(R" in \fBEVP_PKEY_fromdata\fR\|(3).
\&\fBOSSL_PARAM_free\fR\|(3) should be used to free the returned parameters in
\&\fI*params\fR.
.PP
\&\fBEVP_PKEY_export()\fR is similar to \fBEVP_PKEY_todata()\fR but uses a callback
\&\fIexport_cb\fR that gets passed the value of \fIexport_cbarg\fR.
See \fBopenssl\-core.h\fR\|(7) for more information about the callback. Note that the
\&\s-1\fBOSSL_PARAM\s0\fR\|(3) array that is passed to the callback is not persistent after the
callback returns. The user must preserve the items of interest, or use
\&\fBEVP_PKEY_todata()\fR if persistence is required.
.SH "NOTES"
.IX Header "NOTES"
These functions only work with key management methods coming from a provider.
This is the mirror function to \fBEVP_PKEY_fromdata\fR\|(3).
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBEVP_PKEY_todata()\fR and \fBEVP_PKEY_export()\fR return 1 for success and 0 for failure.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\s-1\fBOSSL_PARAM\s0\fR\|(3), \fBopenssl\-core.h\fR\|(7),
\&\fBEVP_PKEY_fromdata\fR\|(3),
\&\s-1\fBEVP_PKEY\-RSA\s0\fR\|(7), \s-1\fBEVP_PKEY\-DSA\s0\fR\|(7), \s-1\fBEVP_PKEY\-DH\s0\fR\|(7), \s-1\fBEVP_PKEY\-EC\s0\fR\|(7),
\&\s-1\fBEVP_PKEY\-ED448\s0\fR\|(7), \s-1\fBEVP_PKEY\-X25519\s0\fR\|(7), \s-1\fBEVP_PKEY\-X448\s0\fR\|(7),
\&\s-1\fBEVP_PKEY\-ED25519\s0\fR\|(7)
.SH "HISTORY"
.IX Header "HISTORY"
These functions were added in OpenSSL 3.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2021\-2022 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.