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give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
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.tr \(*W- . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' . ds C` . ds C' 'br\}
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Title "EVP_PKEY_TODATA 3ossl"
way too many mistakes in technical documents.
Standard preamble:
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.... Set up some character translations and predefined strings. \*(-- will
give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
double quote, and \*(R" will give a right double quote. \*(C+ will
give a nicer C++. Capital omega is used to do unbreakable dashes and
therefore won't be available. \*(C` and \*(C' expand to `' in nroff,
nothing in troff, for use with C<>.
.tr \(*W- . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' . ds C` . ds C' 'br\}
Escape single quotes in literal strings from groff's Unicode transform.
If the F register is >0, we'll generate index entries on stderr for
titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
entries marked with X<> in POD. Of course, you'll have to process the
output yourself in some meaningful fashion.
Avoid warning from groff about undefined register 'F'.
.. .nr rF 0 . if \nF \{\ . de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . if !\nF==2 \{\ . nr % 0 . nr F 2 . \} . \} .\} .rr rF Fear. Run. Save yourself. No user-serviceable parts.
. \" fudge factors for nroff and troff . ds #H 0 . ds #V .8m . ds #F .3m . ds #[ \f1 . ds #] .\} . ds #H ((1u-(\\\\n(.fu%2u))*.13m) . ds #V .6m . ds #F 0 . ds #[ \& . ds #] \& .\} . \" simple accents for nroff and troff . ds ' \& . ds ` \& . ds ^ \& . ds , \& . ds ~ ~ . ds / .\} . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' .\} . \" troff and (daisy-wheel) nroff accents . \" corrections for vroff . \" for low resolution devices (crt and lpr) \{\ . ds : e . ds 8 ss . ds o a . ds d- d\h'-1'\(ga . ds D- D\h'-1'\(hy . ds th \o'bp' . ds Th \o'LP' . ds ae ae . ds Ae AE .\} ========================================================================
Title "EVP_PKEY_TODATA 3ossl"
EVP_PKEY_TODATA 3ossl "2023-09-19" "3.0.11" "OpenSSL"
For nroff, turn off justification. Always turn off hyphenation; it makesway too many mistakes in technical documents.
"NAME"
EVP_PKEY_todata, EVP_PKEY_export
\- functions to return keys as an array of key parameters
"SYNOPSIS"
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
"DESCRIPTION"
Header "DESCRIPTION" The functions described here are used to extract \s-1EVP_PKEY\s0 key values as an
array of \s-1OSSL_PARAM\s0\|(3).
\fBEVP_PKEY_todata() extracts values from a key pkey using the selection. \fIselection is described in \*(L"Selections\*(R" in EVP_PKEY_fromdata\|(3). \fBOSSL_PARAM_free\|(3) should be used to free the returned parameters in \fI*params.
\fBEVP_PKEY_export() is similar to EVP_PKEY_todata() but uses a callback \fIexport_cb that gets passed the value of export_cbarg. See openssl-core.h\|(7) for more information about the callback. Note that the \s-1OSSL_PARAM\s0\|(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() if persistence is required.
"NOTES"
Header "NOTES" These functions only work with key management methods coming from a provider.
This is the mirror function to EVP_PKEY_fromdata\|(3).
"RETURN VALUES"
Header "RETURN VALUES" \fBEVP_PKEY_todata() and EVP_PKEY_export() return 1 for success and 0 for failure.
"SEE ALSO"
Header "SEE ALSO" \s-1OSSL_PARAM\s0\|(3), openssl-core.h\|(7),
\fBEVP_PKEY_fromdata\|(3),
\s-1EVP_PKEY-RSA\s0\|(7), \s-1EVP_PKEY-DSA\s0\|(7), \s-1EVP_PKEY-DH\s0\|(7), \s-1EVP_PKEY-EC\s0\|(7),
\s-1EVP_PKEY-ED448\s0\|(7), \s-1EVP_PKEY-X25519\s0\|(7), \s-1EVP_PKEY-X448\s0\|(7),
\s-1EVP_PKEY-ED25519\s0\|(7)
"HISTORY"
Header "HISTORY" These functions were added in OpenSSL 3.0.
"COPYRIGHT"
Header "COPYRIGHT" Copyright 2021-2023 The OpenSSL Project Authors. All Rights Reserved.
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>.