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+.\" ========================================================================
+.\"
+.IX Title "EVP_PKEY_cmp 3"
+.TH EVP_PKEY_cmp 3 "2016-03-01" "1.0.2g" "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 function \fIEVP_PKEY_cmp_parameters()\fR compares the parameters of keys
+\&\fBa\fR and \fBb\fR.
+.PP
+The function \fIEVP_PKEY_cmp()\fR compares the public key components and paramters
+(if present) of keys \fBa\fR and \fBb\fR.
+.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)