.\" $OpenBSD: d2i_PKCS8PrivateKey_bio.3,v 1.11 2019/06/07 19:28:52 schwarze Exp $
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.Dd $Mdocdate: June 7 2019 $
.Dt D2I_PKCS8PRIVATEKEY_BIO 3
.Os
.Sh NAME
.Nm d2i_PKCS8PrivateKey_bio ,
.Nm d2i_PKCS8PrivateKey_fp ,
.Nm i2d_PKCS8PrivateKey_bio ,
.Nm i2d_PKCS8PrivateKey_fp ,
.Nm i2d_PKCS8PrivateKey_nid_bio ,
.Nm i2d_PKCS8PrivateKey_nid_fp
.Nd PKCS#8 format private key functions
.Sh SYNOPSIS
.In openssl/evp.h
.Ft EVP_PKEY *
.Fo d2i_PKCS8PrivateKey_bio
.Fa "BIO *bp"
.Fa "EVP_PKEY **x"
.Fa "pem_password_cb *cb"
.Fa "void *u"
.Fc
.Ft EVP_PKEY *
.Fo d2i_PKCS8PrivateKey_fp
.Fa "FILE *fp"
.Fa "EVP_PKEY **x"
.Fa "pem_password_cb *cb"
.Fa "void *u"
.Fc
.Ft int
.Fo i2d_PKCS8PrivateKey_bio
.Fa "BIO *bp"
.Fa "EVP_PKEY *x"
.Fa "const EVP_CIPHER *enc"
.Fa "char *kstr"
.Fa "int klen"
.Fa "pem_password_cb *cb"
.Fa "void *u"
.Fc
.Ft int
.Fo i2d_PKCS8PrivateKey_fp
.Fa "FILE *fp"
.Fa "EVP_PKEY *x"
.Fa "const EVP_CIPHER *enc"
.Fa "char *kstr"
.Fa "int klen"
.Fa "pem_password_cb *cb"
.Fa "void *u"
.Fc
.Ft int
.Fo i2d_PKCS8PrivateKey_nid_bio
.Fa "BIO *bp"
.Fa "EVP_PKEY *x"
.Fa "int nid"
.Fa "char *kstr"
.Fa "int klen"
.Fa "pem_password_cb *cb"
.Fa "void *u"
.Fc
.Ft int
.Fo i2d_PKCS8PrivateKey_nid_fp
.Fa "FILE *fp"
.Fa "EVP_PKEY *x"
.Fa "int nid"
.Fa "char *kstr"
.Fa "int klen"
.Fa "pem_password_cb *cb"
.Fa "void *u"
.Fc
.Sh DESCRIPTION
The PKCS#8 functions encode and decode private keys in PKCS#8 format
using both PKCS#5 v1.5 and PKCS#5 v2.0 password based encryption
algorithms.
.Pp
Other than the use of DER as opposed to PEM these functions are
identical to the corresponding functions described in
.Xr PEM_read_PrivateKey 3 .
.Pp
These functions are currently the only way to store encrypted private
keys using DER format.
.Pp
Currently all the functions use
.Vt BIO
or
.Vt FILE
pointers.
There are no functions which work directly on memory,
though this can be readily worked around
by converting the buffers to memory BIOs;
see
.Xr BIO_s_mem 3
for details.
.Sh RETURN VALUES
.Fn d2i_PKCS8PrivateKey_bio
and
.Fn d2i_PKCS8PrivateKey_fp
return a
.Vt EVP_PKEY
object or
.Dv NULL
if an error occurs.
.Pp
.Fn i2d_PKCS8PrivateKey_bio ,
.Fn i2d_PKCS8PrivateKey_fp ,
.Fn i2d_PKCS8PrivateKey_nid_bio ,
and
.Fn i2d_PKCS8PrivateKey_nid_fp
return 1 on success or 0 on error.
.Sh SEE ALSO
.Xr d2i_X509_SIG 3 ,
.Xr PEM_write_PKCS8PrivateKey 3 ,
.Xr PKCS8_PRIV_KEY_INFO_new 3
.Sh HISTORY
These functions first appeared in OpenSSL 0.9.5
and have been available since
.Ox 2.7 .
.Sh CAVEATS
Do not confuse these functions with
.Xr i2d_PKCS8PrivateKeyInfo_bio 3
and
.Xr i2d_PKCS8PrivateKeyInfo_fp 3 ,
which write out private keys in
.Sy unencrypted
DER format.