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.IX Title "EVP_PKEY_PRINT_PRIVATE 3ossl"
.TH EVP_PKEY_PRINT_PRIVATE 3ossl 2026-06-09 3.5.7 OpenSSL
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH NAME
EVP_PKEY_print_public, EVP_PKEY_print_private, EVP_PKEY_print_params,
EVP_PKEY_print_public_fp, EVP_PKEY_print_private_fp,
EVP_PKEY_print_params_fp \- public key algorithm printing routines
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/evp.h>
\&
\& int EVP_PKEY_print_public(BIO *out, const EVP_PKEY *pkey,
\&                           int indent, ASN1_PCTX *pctx);
\& int EVP_PKEY_print_public_fp(FILE *fp, const EVP_PKEY *pkey,
\&                              int indent, ASN1_PCTX *pctx);
\& int EVP_PKEY_print_private(BIO *out, const EVP_PKEY *pkey,
\&                            int indent, ASN1_PCTX *pctx);
\& int EVP_PKEY_print_private_fp(FILE *fp, const EVP_PKEY *pkey,
\&                               int indent, ASN1_PCTX *pctx);
\& int EVP_PKEY_print_params(BIO *out, const EVP_PKEY *pkey,
\&                           int indent, ASN1_PCTX *pctx);
\& int EVP_PKEY_print_params_fp(FILE *fp, const EVP_PKEY *pkey,
\&                              int indent, ASN1_PCTX *pctx);
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
The functions \fBEVP_PKEY_print_public()\fR, \fBEVP_PKEY_print_private()\fR and
\&\fBEVP_PKEY_print_params()\fR print out the public, private or parameter components
of key \fIpkey\fR respectively. The key is sent to \fBBIO\fR \fIout\fR in human readable
form. The parameter \fIindent\fR indicates how far the printout should be indented.
.PP
The \fIpctx\fR parameter allows the print output to be finely tuned by using
ASN1 printing options. If \fIpctx\fR is set to NULL then default values will
be used.
.PP
The functions \fBEVP_PKEY_print_public_fp()\fR, \fBEVP_PKEY_print_private_fp()\fR and
\&\fBEVP_PKEY_print_params_fp()\fR do the same as the \fBBIO\fR based functions
but use \fBFILE\fR \fIfp\fR instead.
.SH NOTES
.IX Header "NOTES"
Currently no public key algorithms include any options in the \fIpctx\fR parameter.
.PP
If the key does not include all the components indicated by the function then
only those contained in the key will be printed. For example passing a public
key to \fBEVP_PKEY_print_private()\fR will only print the public components.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
These functions all return 1 for success and 0 or a negative value for failure.
In particular a return value of \-2 indicates the operation is not supported by
the public key algorithm.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBEVP_PKEY_CTX_new\fR\|(3),
\&\fBEVP_PKEY_keygen\fR\|(3)
.SH HISTORY
.IX Header "HISTORY"
The functions \fBEVP_PKEY_print_public()\fR, \fBEVP_PKEY_print_private()\fR,
and \fBEVP_PKEY_print_params()\fR were added in OpenSSL 1.0.0.
.PP
The functions \fBEVP_PKEY_print_public_fp()\fR, \fBEVP_PKEY_print_private_fp()\fR,
and \fBEVP_PKEY_print_params_fp()\fR were added in OpenSSL 3.0.
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright 2006\-2021 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the "License").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file LICENSE in the source distribution or at
<https://www.openssl.org/source/license.html>.
