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1.\" $OpenBSD: X509_cmp.3,v 1.4 2024/06/07 14:00:09 job Exp $
2.\" full merge up to: OpenSSL ea5d4b89 Jun 6 11:42:02 2019 +0800
3.\"
4.\" This file is a derived work.
5.\" The changes are covered by the following Copyright and license:
6.\"
7.\" Copyright (c) 2019 Ingo Schwarze <schwarze@openbsd.org>
8.\"
9.\" Permission to use, copy, modify, and distribute this software for any
10.\" purpose with or without fee is hereby granted, provided that the above
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14.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
15.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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19.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20.\"
21.\" The original file was written by Paul Yang <yang.yang@baishancloud.com>.
22.\" Copyright (c) 2019 The OpenSSL Project. All rights reserved.
23.\"
24.\" Redistribution and use in source and binary forms, with or without
25.\" modification, are permitted provided that the following conditions
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68.Dd $Mdocdate: June 7 2024 $
69.Dt X509_CMP 3
70.Os
71.Sh NAME
72.Nm X509_cmp ,
73.Nm X509_NAME_cmp ,
74.\" The alias X509_name_cmp(3) is intentionally undocumented
75.\" because it is almost unused in real-world code.
76.Nm X509_issuer_and_serial_cmp ,
77.Nm X509_issuer_name_cmp ,
78.Nm X509_subject_name_cmp ,
79.Nm X509_CRL_cmp ,
80.Nm X509_CRL_match
81.Nd compare X.509 certificates and related values
82.\" The function name_cmp() is intentionally undocumented.
83.\" It was a mistake to make it public in the first place,
84.\" and it is no longer part of the public API in OpenSSL 1.1.
85.Sh SYNOPSIS
86.In openssl/x509.h
87.Ft int
88.Fo X509_cmp
89.Fa "const X509 *a"
90.Fa "const X509 *b"
91.Fc
92.Ft int
93.Fo X509_NAME_cmp
94.Fa "const X509_NAME *a"
95.Fa "const X509_NAME *b"
96.Fc
97.Ft int
98.Fo X509_issuer_and_serial_cmp
99.Fa "const X509 *a"
100.Fa "const X509 *b"
101.Fc
102.Ft int
103.Fo X509_issuer_name_cmp
104.Fa "const X509 *a"
105.Fa "const X509 *b"
106.Fc
107.Ft int
108.Fo X509_subject_name_cmp
109.Fa "const X509 *a"
110.Fa "const X509 *b"
111.Fc
112.Ft int
113.Fo X509_CRL_cmp
114.Fa "const X509_CRL *a"
115.Fa "const X509_CRL *b"
116.Fc
117.Ft int
118.Fo X509_CRL_match
119.Fa "const X509_CRL *a"
120.Fa "const X509_CRL *b"
121.Fc
122.Sh DESCRIPTION
123.Fn X509_cmp
124compares two X.509 certificates using
125.Xr memcmp 3
126on the hashes of their canonical (DER) representations as generated with
127.Xr X509_digest 3 .
128The digest function is implementation-specific: LibreSSL uses SHA-512, other
129implementations use SHA-1.
130.Pp
131.Fn X509_NAME_cmp
132compares two X.501
133.Vt Name
134objects using their canonical (DER) representations generated with
135.Xr i2d_X509_NAME 3 .
136.Pp
137.Fn X509_issuer_and_serial_cmp
138compares the
139.Fa issuer
140and
141.Fa serialNumber
142fields of two
143.Vt TBSCertificate
144structures, using
145.Fn X509_NAME_cmp
146for the
147.Fa issuer
148fields.
149.Pp
150.Fn X509_issuer_name_cmp
151compares the
152.Fa issuer
153fields of two
154.Vt TBSCertificate
155structures using
156.Fn X509_NAME_cmp .
157.Pp
158.Fn X509_subject_name_cmp
159compares the
160.Fa subject
161fields of two
162.Vt TBSCertificate
163structures using
164.Fn X509_NAME_cmp .
165.Pp
166.Fn X509_CRL_cmp
167is misnamed; it only compares the
168.Fa issuer
169fields of two
170.Vt TBSCertList
171structures using
172.Fn X509_NAME_cmp .
173.Pp
174.Fn X509_CRL_match
175compares two certificate revocation lists using
176.Xr memcmp 3
177on the hashes of their canonical (DER) representations as generated with
178.Xr X509_CRL_digest 3 .
179The digest function is implementation-specific: LibreSSL uses SHA-512, other
180implementations use SHA-1.
181.Sh RETURN VALUES
182All these functions return 0 to indicate a match or a non-zero value
183to indicate a mismatch.
184.Pp
185.Fn X509_NAME_cmp ,
186.Fn X509_issuer_and_serial_cmp ,
187.Fn X509_issuer_name_cmp ,
188.Fn X509_subject_name_cmp
189and
190.Fn X509_CRL_cmp
191may return -2 to indicate an error.
192.Sh SEE ALSO
193.Xr i2d_X509_NAME 3 ,
194.Xr X509_CRL_new 3 ,
195.Xr X509_digest 3 ,
196.Xr X509_NAME_new 3 ,
197.Xr X509_new 3
198.Sh STANDARDS
199RFC 5280: Internet X.509 Public Key Infrastructure Certificate
200and Certificate Revocation List (CRL) Profile
201.Bl -dash -compact -offset indent
202.It
203section 4.1: Basic Certificate Fields
204.It
205section 5.1: CRL Fields
206.El
207.Sh HISTORY
208.Fn X509_issuer_and_serial_cmp ,
209.Fn X509_issuer_name_cmp ,
210and
211.Fn X509_subject_name_cmp
212first appeared in SSLeay 0.5.1 and
213.Fn X509_NAME_cmp
214and
215.Fn X509_CRL_cmp
216in SSLeay 0.8.0.
217These functions have been available since
218.Ox 2.4 .
219.Pp
220.Fn X509_cmp
221first appeared in OpenSSL 0.9.5 and has been available since
222.Ox 2.7 .
223.Pp
224.Fn X509_CRL_match
225first appeared in OpenSSL 1.0.0 and has been available since
226.Ox 4.9 .
227.Sh BUGS
228For
229.Fn X509_NAME_cmp ,
230.Fn X509_issuer_and_serial_cmp ,
231.Fn X509_issuer_name_cmp ,
232.Fn X509_subject_name_cmp
233and
234.Fn X509_CRL_cmp ,
235the return value -2 sometimes indicates a mismatch and sometimes an error.
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-12-23 13:35:18 +0000