22

✏️ Editing: d2i_PrivateKey.3

.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35)
.\"
.\" Standard preamble:
.\" ========================================================================
.de Sp \" Vertical space (when we can't use .PP)
.if t .sp .5v
.if n .sp
..
.de Vb \" Begin verbatim text
.ft CW
.nf
.ne \\$1
..
.de Ve \" End verbatim text
.ft R
.fi
..
.\" 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 C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
.ie n \{\
.    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\}
.el\{\
.    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.
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\"
.\" 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'.
.de IX
..
.nr rF 0
.if \n(.g .if rF .nr rF 1
.if (\n(rF:(\n(.g==0)) \{\
.    if \nF \{\
.        de IX
.        tm Index:\\$1\t\\n%\t"\\$2"
..
.        if !\nF==2 \{\
.            nr % 0
.            nr F 2
.        \}
.    \}
.\}
.rr rF
.\"
.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
.\" Fear.  Run.  Save yourself.  No user-serviceable parts.
.    \" fudge factors for nroff and troff
.if n \{\
.    ds #H 0
.    ds #V .8m
.    ds #F .3m
.    ds #[ \f1
.    ds #] \fP
.\}
.if t \{\
.    ds #H ((1u-(\\\\n(.fu%2u))*.13m)
.    ds #V .6m
.    ds #F 0
.    ds #[ \&
.    ds #] \&
.\}
.    \" simple accents for nroff and troff
.if n \{\
.    ds ' \&
.    ds ` \&
.    ds ^ \&
.    ds , \&
.    ds ~ ~
.    ds /
.\}
.if t \{\
.    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
.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
.ds 8 \h'\*(#H'\(*b\h'-\*(#H'
.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
.ds ae a\h'-(\w'a'u*4/10)'e
.ds Ae A\h'-(\w'A'u*4/10)'E
.    \" corrections for vroff
.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
.    \" for low resolution devices (crt and lpr)
.if \n(.H>23 .if \n(.V>19 \
\{\
.    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
.\}
.rm #[ #] #H #V #F C
.\" ========================================================================
.\"
.IX Title "D2I_PRIVATEKEY 3"
.TH D2I_PRIVATEKEY 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
d2i_PrivateKey, d2i_PublicKey, d2i_AutoPrivateKey, i2d_PrivateKey, i2d_PublicKey, d2i_PrivateKey_bio, d2i_PrivateKey_fp \&\- decode and encode functions for reading and saving EVP_PKEY structures
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/evp.h>
\&
\& EVP_PKEY *d2i_PrivateKey(int type, EVP_PKEY **a, const unsigned char **pp,
\&                          long length);
\& EVP_PKEY *d2i_PublicKey(int type, EVP_PKEY **a, const unsigned char **pp,
\&                         long length);
\& EVP_PKEY *d2i_AutoPrivateKey(EVP_PKEY **a, const unsigned char **pp,
\&                              long length);
\& int i2d_PrivateKey(EVP_PKEY *a, unsigned char **pp);
\& int i2d_PublicKey(EVP_PKEY *a, unsigned char **pp);
\&
\& EVP_PKEY *d2i_PrivateKey_bio(BIO *bp, EVP_PKEY **a);
\& EVP_PKEY *d2i_PrivateKey_fp(FILE *fp, EVP_PKEY **a)
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBd2i_PrivateKey()\fR decodes a private key using algorithm \fBtype\fR. It attempts to
use any key specific format or PKCS#8 unencrypted PrivateKeyInfo format. The
\&\fBtype\fR parameter should be a public key algorithm constant such as
\&\fB\s-1EVP_PKEY_RSA\s0\fR. An error occurs if the decoded key does not match \fBtype\fR.
\&\fBd2i_PublicKey()\fR does the same for public keys.
.PP
\&\fBd2i_AutoPrivateKey()\fR is similar to \fBd2i_PrivateKey()\fR except it attempts to
automatically detect the private key format.
.PP
\&\fBi2d_PrivateKey()\fR encodes \fBkey\fR. It uses a key specific format or, if none is
defined for that key type, PKCS#8 unencrypted PrivateKeyInfo format.
\&\fBi2d_PublicKey()\fR does the same for public keys.
.PP
These functions are similar to the \fBd2i_X509()\fR functions; see \fBd2i_X509\fR\|(3).
.SH "NOTES"
.IX Header "NOTES"
All the functions that operate on data in memory update the data pointer \fI*pp\fR
after a successful operation, just like the other d2i and i2d functions;
see \fBd2i_X509\fR\|(3).
.PP
All these functions use \s-1DER\s0 format and unencrypted keys. Applications wishing
to encrypt or decrypt private keys should use other functions such as
\&\fBd2i_PKCS8PrivateKey()\fR instead.
.PP
If the \fB*a\fR is not \s-1NULL\s0 when calling \fBd2i_PrivateKey()\fR or \fBd2i_AutoPrivateKey()\fR
(i.e. an existing structure is being reused) and the key format is PKCS#8
then \fB*a\fR will be freed and replaced on a successful call.
.PP
To decode a key with type \fB\s-1EVP_PKEY_EC\s0\fR, \fBd2i_PublicKey()\fR requires \fB*a\fR to be
a non-NULL \s-1EVP_PKEY\s0 structure assigned an \s-1EC_KEY\s0 structure referencing the proper
\&\s-1EC_GROUP.\s0
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
The \fBd2i_PrivateKey()\fR, \fBd2i_AutoPrivateKey()\fR, \fBd2i_PrivateKey_bio()\fR, \fBd2i_PrivateKey_fp()\fR,
and \fBd2i_PublicKey()\fR functions return a valid \fB\s-1EVP_KEY\s0\fR structure or \fB\s-1NULL\s0\fR if an
error occurs. The error code can be obtained by calling \fBERR_get_error\fR\|(3).
.PP
\&\fBi2d_PrivateKey()\fR and \fBi2d_PublicKey()\fR return the number of bytes successfully
encoded or a negative value if an error occurs. The error code can be obtained
by calling \fBERR_get_error\fR\|(3).
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBcrypto\fR\|(7),
\&\fBd2i_PKCS8PrivateKey_bio\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2017\-2021 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (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>.

MR SKB