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.IX Title "EVP_PKEY_print_private 3"
.TH EVP_PKEY_print_private 3 2019-12-20 1.0.2u OpenSSL
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH NAME
EVP_PKEY_print_public, EVP_PKEY_print_private, EVP_PKEY_print_params \- 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_private(BIO *out, 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);
.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 \fBpkey\fR respectively. The key is sent to BIO \fBout\fR in human readable
form. The parameter \fBindent\fR indicated how far the printout should be indented.
.PP
The \fBpctx\fR parameter allows the print output to be finely tuned by using
ASN1 printing options. If \fBpctx\fR is set to NULL then default values will
be used.
.SH NOTES
.IX Header "NOTES"
Currently no public key algorithms include any options in the \fBpctx\fR parameter 
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"
These functions were first added to OpenSSL 1.0.0.