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.\" $OpenBSD: d2i_PrivateKey.3,v 1.3 2016/12/08 20:22:08 jmc Exp $
.\" OpenSSL b97fdb57 Nov 11 09:33:09 2016 +0100
.\"
.\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
.\" Copyright (c) 2016 The OpenSSL Project. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\"
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\"
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in
.\" the documentation and/or other materials provided with the
.\" distribution.
.\"
.\" 3. All advertising materials mentioning features or use of this
.\" software must display the following acknowledgment:
.\" "This product includes software developed by the OpenSSL Project
.\" for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
.\"
.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
.\" endorse or promote products derived from this software without
.\" prior written permission. For written permission, please contact
.\" openssl-core@openssl.org.
.\"
.\" 5. Products derived from this software may not be called "OpenSSL"
.\" nor may "OpenSSL" appear in their names without prior written
.\" permission of the OpenSSL Project.
.\"
.\" 6. Redistributions of any form whatsoever must retain the following
.\" acknowledgment:
.\" "This product includes software developed by the OpenSSL Project
.\" for use in the OpenSSL Toolkit (http://www.openssl.org/)"
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
.\" OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd $Mdocdate: December 8 2016 $
.Dt D2I_PRIVATEKEY 3
.Os
.Sh NAME
.Nm d2i_PrivateKey ,
.Nm d2i_AutoPrivateKey ,
.Nm i2d_PrivateKey ,
.Nm d2i_PrivateKey_bio ,
.Nm d2i_PrivateKey_fp
.Nd decode and encode functions for reading and saving EVP_PKEY structures
.Sh SYNOPSIS
.In openssl/evp.h
.Ft EVP_PKEY *
.Fo d2i_PrivateKey
.Fa "int type"
.Fa "EVP_PKEY **a"
.Fa "const unsigned char **pp"
.Fa "long length"
.Fc
.Ft EVP_PKEY *
.Fo d2i_AutoPrivateKey
.Fa "EVP_PKEY **a"
.Fa "const unsigned char **pp"
.Fa "long length"
.Fc
.Ft int
.Fo i2d_PrivateKey
.Fa "EVP_PKEY *a"
.Fa "unsigned char **pp"
.Fc
.Ft EVP_PKEY *
.Fo d2i_PrivateKey_bio
.Fa "BIO *bp"
.Fa "EVP_PKEY **a"
.Fc
.Ft EVP_PKEY *
.Fo d2i_PrivateKey_fp
.Fa "FILE *fp"
.Fa "EVP_PKEY **a"
.Fc
.Sh DESCRIPTION
.Fn d2i_PrivateKey
decodes a private key using algorithm
.Fa type .
It attempts to use any key specific format or PKCS#8 unencrypted
PrivateKeyInfo format.
The
.Fa type
parameter should be a public key algorithm constant such as
.Dv EVP_PKEY_RSA .
An error occurs if the decoded key does not match
.Fa type .
.Pp
.Fn d2i_AutoPrivateKey
is similar to
.Fn d2i_PrivateKey
except that it attempts to automatically detect the private key format.
.Pp
.Fn i2d_PrivateKey
encodes
.Fa a .
It uses a key specific format or, if none is defined for that key type,
PKCS#8 unencrypted PrivateKeyInfo format.
.Pp
These functions are similar to the
.Xr d2i_X509 3
functions; see
.Xr d2i_X509 3 .
.Pp
All these functions use DER format and unencrypted keys.
Applications wishing to encrypt or decrypt private keys should use other
functions such as
.Xr d2i_PKCS8PrivateKey_bio 3
instead.
.Pp
If
.Pf * Fa a
is not NULL when calling
.Fn d2i_PrivateKey
or
.Fn d2i_AutoPrivateKey
(i.e. an existing structure is being reused) and the key format is
PKCS#8, then
.Pf * Fa a
will be freed and replaced on a successful call.
.Sh RETURN VALUES
.Fn d2i_PrivateKey
and
.Fn d2i_AutoPrivateKey
return a valid
.Vt EVP_KEY
structure or
.Dv NULL
if an error occurs.
The error code can be obtained by calling
.Xr ERR_get_error 3 .
.Pp
.Fn i2d_PrivateKey
returns the number of bytes successfully encoded or a negative value if
an error occurs.
The error code can be obtained by calling
.Xr ERR_get_error 3 .
.Sh SEE ALSO
.Xr d2i_PKCS8PrivateKey_bio 3
|
