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EVP_PKEY_cmp.3
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. 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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 \fBEVP_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 \fBEVP_PKEY_copy_parameters()\fR copies the parameters from key \&\fBfrom\fR to key \fBto\fR. An error is returned if the parameters are missing in \&\fBfrom\fR or present in both \fBfrom\fR and \fBto\fR and mismatch. If the parameters in \fBfrom\fR and \fBto\fR are both present and match this function has no effect. .PP The function \fBEVP_PKEY_cmp_parameters()\fR compares the parameters of keys \&\fBa\fR and \fBb\fR. .PP The function \fBEVP_PKEY_cmp()\fR compares the public key components and parameters (if present) of keys \fBa\fR and \fBb\fR. .SH "NOTES" .IX Header "NOTES" The main purpose of the functions \fBEVP_PKEY_missing_parameters()\fR and \&\fBEVP_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 \&\fBEVP_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 \fBEVP_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 \fBEVP_PKEY_copy_parameters()\fR returns 1 for success and 0 for failure. .PP The function \fBEVP_PKEY_cmp_parameters()\fR and \fBEVP_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" \&\fBEVP_PKEY_CTX_new\fR\|(3), \&\fBEVP_PKEY_keygen\fR\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2006\-2016 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
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