| 1 | =pod
|
|---|
| 2 |
|
|---|
| 3 | =head1 NAME
|
|---|
| 4 |
|
|---|
| 5 | X509_cmp, X509_NAME_cmp,
|
|---|
| 6 | X509_issuer_and_serial_cmp, X509_issuer_name_cmp, X509_subject_name_cmp,
|
|---|
| 7 | X509_CRL_cmp, X509_CRL_match
|
|---|
| 8 | - compare X509 certificates and related values
|
|---|
| 9 |
|
|---|
| 10 | =head1 SYNOPSIS
|
|---|
| 11 |
|
|---|
| 12 | #include <openssl/x509.h>
|
|---|
| 13 |
|
|---|
| 14 | int X509_cmp(const X509 *a, const X509 *b);
|
|---|
| 15 | int X509_NAME_cmp(const X509_NAME *a, const X509_NAME *b);
|
|---|
| 16 | int X509_issuer_and_serial_cmp(const X509 *a, const X509 *b);
|
|---|
| 17 | int X509_issuer_name_cmp(const X509 *a, const X509 *b);
|
|---|
| 18 | int X509_subject_name_cmp(const X509 *a, const X509 *b);
|
|---|
| 19 | int X509_CRL_cmp(const X509_CRL *a, const X509_CRL *b);
|
|---|
| 20 | int X509_CRL_match(const X509_CRL *a, const X509_CRL *b);
|
|---|
| 21 |
|
|---|
| 22 | =head1 DESCRIPTION
|
|---|
| 23 |
|
|---|
| 24 | This set of functions are used to compare X509 objects, including X509
|
|---|
| 25 | certificates, X509 CRL objects and various values in an X509 certificate.
|
|---|
| 26 |
|
|---|
| 27 | The X509_cmp() function compares two B<X509> objects indicated by parameters
|
|---|
| 28 | B<a> and B<b>. The comparison is based on the B<memcmp> result of the hash
|
|---|
| 29 | values of two B<X509> objects and the canonical (DER) encoding values.
|
|---|
| 30 |
|
|---|
| 31 | The X509_NAME_cmp() function compares two B<X509_NAME> objects indicated by
|
|---|
| 32 | parameters B<a> and B<b>. The comparison is based on the B<memcmp> result of
|
|---|
| 33 | the canonical (DER) encoding values of the two objects. L<i2d_X509_NAME(3)>
|
|---|
| 34 | has a more detailed description of the DER encoding of the B<X509_NAME> structure.
|
|---|
| 35 |
|
|---|
| 36 | The X509_issuer_and_serial_cmp() function compares the serial number and issuer
|
|---|
| 37 | values in the given B<X509> objects B<a> and B<b>.
|
|---|
| 38 |
|
|---|
| 39 | The X509_issuer_name_cmp(), X509_subject_name_cmp() and X509_CRL_cmp() functions
|
|---|
| 40 | are effectively wrappers of the X509_NAME_cmp() function. These functions compare
|
|---|
| 41 | issuer names and subject names of the X<509> objects, or issuers of B<X509_CRL>
|
|---|
| 42 | objects, respectively.
|
|---|
| 43 |
|
|---|
| 44 | The X509_CRL_match() function compares two B<X509_CRL> objects. Unlike the
|
|---|
| 45 | X509_CRL_cmp() function, this function compares the whole CRL content instead
|
|---|
| 46 | of just the issuer name.
|
|---|
| 47 |
|
|---|
| 48 | =head1 RETURN VALUES
|
|---|
| 49 |
|
|---|
| 50 | Like common memory comparison functions, the B<X509> comparison functions return
|
|---|
| 51 | an integer less than, equal to, or greater than zero if object B<a> is found to
|
|---|
| 52 | be less than, to match, or be greater than object B<b>, respectively.
|
|---|
| 53 |
|
|---|
| 54 | X509_NAME_cmp(), X509_issuer_and_serial_cmp(), X509_issuer_name_cmp(),
|
|---|
| 55 | X509_subject_name_cmp() and X509_CRL_cmp() may return B<-2> to indicate an error.
|
|---|
| 56 |
|
|---|
| 57 | =head1 NOTES
|
|---|
| 58 |
|
|---|
| 59 | These functions in fact utilize the underlying B<memcmp> of the C library to do
|
|---|
| 60 | the comparison job. Data to be compared varies from DER encoding data, hash
|
|---|
| 61 | value or B<ASN1_STRING>. The sign of the comparison can be used to order the
|
|---|
| 62 | objects but it does not have a special meaning in some cases.
|
|---|
| 63 |
|
|---|
| 64 | X509_NAME_cmp() and wrappers utilize the value B<-2> to indicate errors in some
|
|---|
| 65 | circumstances, which could cause confusion for the applications.
|
|---|
| 66 |
|
|---|
| 67 | =head1 SEE ALSO
|
|---|
| 68 |
|
|---|
| 69 | L<i2d_X509_NAME(3)>, L<i2d_X509(3)>
|
|---|
| 70 |
|
|---|
| 71 | =head1 COPYRIGHT
|
|---|
| 72 |
|
|---|
| 73 | Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
|
|---|
| 74 |
|
|---|
| 75 | Licensed under the Apache License 2.0 (the "License"). You may not use
|
|---|
| 76 | this file except in compliance with the License. You can obtain a copy
|
|---|
| 77 | in the file LICENSE in the source distribution or at
|
|---|
| 78 | L<https://www.openssl.org/source/license.html>.
|
|---|
| 79 |
|
|---|
| 80 | =cut
|
|---|
