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.\" ========================================================================
.\"
.IX Title "EVP_PKEY_cmp 3openssl"
.TH EVP_PKEY_cmp 3openssl "2016-05-03" "1.0.1t" "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"
EVP_PKEY_copy_parameters, EVP_PKEY_missing_parameters, EVP_PKEY_cmp_parameters, EVP_PKEY_cmp \- public key parameter and comparison functions
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/evp.h>
\&
\& int EVP_PKEY_missing_parameters(const EVP_PKEY *pkey);
\& int EVP_PKEY_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from);
\&
\& int EVP_PKEY_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b);
\& int EVP_PKEY_cmp(const EVP_PKEY *a, const EVP_PKEY *b);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The function \fIEVP_PKEY_missing_parameters()\fR returns 1 if the public key
parameters of \fBpkey\fR are missing and 0 if they are present or the algorithm
doesn't use parameters.
.PP
The function \fIEVP_PKEY_copy_parameters()\fR copies the parameters from key
\&\fBfrom\fR to key \fBto\fR.
.PP
The funcion \fIEVP_PKEY_cmp_parameters()\fR compares the parameters of keys
\&\fBa\fR and \fBb\fR.
.PP
The funcion \fIEVP_PKEY_cmp()\fR compares the public key components and paramters
(if present) of keys \fBa\fR and \fBb\fR.

.\" Oracle has added the ARC stability level to this manual page
.SH ATTRIBUTES
See
.BR attributes (5)
for descriptions of the following attributes:
.sp
.TS
box;
cbp-1 | cbp-1
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE 
=
Availability	library/security/openssl
=
Stability	Uncommitted
.TE 
.PP
.SH "NOTES"
.IX Header "NOTES"
The main purpose of the functions \fIEVP_PKEY_missing_parameters()\fR and
\&\fIEVP_PKEY_copy_parameters()\fR is to handle public keys in certificates where the
parameters are sometimes omitted from a public key if they are inherited from
the \s-1CA\s0 that signed it.
.PP
Since OpenSSL private keys contain public key components too the function
\&\fIEVP_PKEY_cmp()\fR can also be used to determine if a private key matches
a public key.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
The function \fIEVP_PKEY_missing_parameters()\fR returns 1 if the public key
parameters of \fBpkey\fR are missing and 0 if they are present or the algorithm
doesn't use parameters.
.PP
These functions \fIEVP_PKEY_copy_parameters()\fR returns 1 for success and 0 for
failure.
.PP
The function \fIEVP_PKEY_cmp_parameters()\fR and \fIEVP_PKEY_cmp()\fR return 1 if the
keys match, 0 if they don't match, \-1 if the key types are different and
\&\-2 if the operation is not supported.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIEVP_PKEY_CTX_new\fR\|(3),
\&\fIEVP_PKEY_keygen\fR\|(3)


.\" Oracle has added source availability information to this manual page
This software was built from source available at https://java.net/projects/solaris-userland.  The original community source was downloaded from  http://www.openssl.org/source/openssl-1.0.1t.tar.gz

Further information about this software can be found on the open source community website at http://www.openssl.org/.