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1.\" $OpenBSD: EVP_PKEY_cmp.3,v 1.15 2024/12/06 12:51:13 schwarze Exp $
2.\" full merge up to: OpenSSL 05ea606a May 20 20:52:46 2016 -0400
3.\" selective merge up to: OpenSSL 99d63d46 Oct 26 13:56:48 2016 -0400
4.\"
5.\" This file is a derived work.
6.\" The changes are covered by the following Copyright and license:
7.\"
8.\" Copyright (c) 2021 Ingo Schwarze <schwarze@openbsd.org>
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22.\" The original file was written by Dr. Stephen Henson <steve@openssl.org>.
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70.Dd $Mdocdate: December 6 2024 $
71.Dt EVP_PKEY_CMP 3
72.Os
73.Sh NAME
74.Nm EVP_PKEY_missing_parameters ,
75.Nm EVP_PKEY_copy_parameters ,
76.Nm EVP_PKEY_cmp_parameters ,
77.Nm EVP_PKEY_cmp
78.\" .Nm EVP_PKEY_save_parameters is intentionally undocumented
79.\" because nothing uses it according to codesearch.debian.net
80.\" and it only affects X509_PUBKEY_set(3) for DSA,
81.\" resulting in incomplete output without the public key parameters.
82.Nd public key parameter and comparison functions
83.Sh SYNOPSIS
84.In openssl/evp.h
85.Ft int
86.Fo EVP_PKEY_missing_parameters
87.Fa "const EVP_PKEY *pkey"
88.Fc
89.Ft int
90.Fo EVP_PKEY_copy_parameters
91.Fa "EVP_PKEY *destination"
92.Fa "const EVP_PKEY *source"
93.Fc
94.Ft int
95.Fo EVP_PKEY_cmp_parameters
96.Fa "const EVP_PKEY *a"
97.Fa "const EVP_PKEY *b"
98.Fc
99.Ft int
100.Fo EVP_PKEY_cmp
101.Fa "const EVP_PKEY *a"
102.Fa "const EVP_PKEY *b"
103.Fc
104.Sh DESCRIPTION
105.Fn EVP_PKEY_missing_parameters
106checks whether any public key parameters are missing from
107.Fa pkey .
108.Pp
109.Fn EVP_PKEY_copy_parameters
110copies all public key parameters from the
111.Fa source
112to the
113.Fa destination .
114If the algorithm does not use parameters, no action occurs.
115.Pp
116.Fn EVP_PKEY_cmp_parameters
117compares the public key parameters of
118.Fa a
119and
120.Fa b .
121This is only supported for algorithms that use parameters.
122.Pp
123.Fn EVP_PKEY_cmp
124compares the public key components of
125.Fa a
126and
127.Fa b .
128If the algorithm uses public key parameters,
129it also compares the parameters.
130.Pp
131The main purpose of the functions
132.Fn EVP_PKEY_missing_parameters
133and
134.Fn EVP_PKEY_copy_parameters
135is to handle public keys in certificates where the parameters are
136sometimes omitted from a public key if they are inherited from the CA
137that signed it.
138.Pp
139Since OpenSSL private keys contain public key components too, the
140function
141.Fn EVP_PKEY_cmp
142can also be used to determine if a private key matches a public key.
143.Sh RETURN VALUES
144.Fn EVP_PKEY_missing_parameters
145returns 1 if the public key parameters of
146.Fa pkey
147are missing or incomplete or 0 if they are present and complete
148or if the algorithm doesn't use parameters.
149.Pp
150.Fn EVP_PKEY_copy_parameters
151returns 1 for success or 0 for failure.
152In particular, it fails if the key types mismatch or if the public
153key parameters in the
154.Fa source
155are missing or incomplete.
156.Pp
157.Fn EVP_PKEY_cmp_parameters
158and
159.Fn EVP_PKEY_cmp
160return 1 if the keys match, 0 if they don't match, -1 if the key types
161are different and -2 if the operation is not supported.
162.Sh SEE ALSO
163.Xr EVP_PKEY_CTX_new 3 ,
164.Xr EVP_PKEY_keygen 3 ,
165.Xr EVP_PKEY_new 3 ,
166.Xr X509_get_pubkey_parameters 3
167.Sh HISTORY
168.Fn EVP_PKEY_missing_parameters
169and
170.Fn EVP_PKEY_copy_parameters
171first appeared in SSLeay 0.8.0.
172.Fn EVP_PKEY_cmp_parameters
173first appeared in SSLeay 0.9.0.
174These functions have been available since
175.Ox 2.4 .
176.Pp
177.Fn EVP_PKEY_cmp
178first appeared in OpenSSL 0.9.8 and has been available since
179.Ox 4.5 .
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