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85 lines
3.3 KiB
Plaintext
85 lines
3.3 KiB
Plaintext
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=pod
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=head1 NAME
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X509_cmp, X509_NAME_cmp,
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X509_issuer_and_serial_cmp, X509_issuer_name_cmp, X509_subject_name_cmp,
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X509_CRL_cmp, X509_CRL_match
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- compare X509 certificates and related values
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=head1 SYNOPSIS
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#include <openssl/x509.h>
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int X509_cmp(const X509 *a, const X509 *b);
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int X509_NAME_cmp(const X509_NAME *a, const X509_NAME *b);
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int X509_issuer_and_serial_cmp(const X509 *a, const X509 *b);
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int X509_issuer_name_cmp(const X509 *a, const X509 *b);
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int X509_subject_name_cmp(const X509 *a, const X509 *b);
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int X509_CRL_cmp(const X509_CRL *a, const X509_CRL *b);
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int X509_CRL_match(const X509_CRL *a, const X509_CRL *b);
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=head1 DESCRIPTION
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This set of functions are used to compare X509 objects, including X509
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certificates, X509 CRL objects and various values in an X509 certificate.
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The X509_cmp() function compares two B<X509> objects indicated by parameters
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I<a> and I<b>. The comparison is based on the B<memcmp> result of the hash
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values of two B<X509> objects and the canonical (DER) encoding values.
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The X509_NAME_cmp() function compares two B<X509_NAME> objects indicated by
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parameters I<a> and I<b>. The comparison is based on the B<memcmp> result of the
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canonical (DER) encoding values of the two objects using L<i2d_X509_NAME(3)>.
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This procedure adheres to the matching rules for Distinguished Names (DN)
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given in RFC 4517 section 4.2.15 and RFC 5280 section 7.1.
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In particular, the order of Relative Distinguished Names (RDNs) is relevant.
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On the other hand, if an RDN is multi-valued, i.e., it contains a set of
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AttributeValueAssertions (AVAs), its members are effectively not ordered.
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The X509_issuer_and_serial_cmp() function compares the serial number and issuer
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values in the given B<X509> objects I<a> and I<b>.
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The X509_issuer_name_cmp(), X509_subject_name_cmp() and X509_CRL_cmp() functions
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are effectively wrappers of the X509_NAME_cmp() function. These functions compare
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issuer names and subject names of the X<509> objects, or issuers of B<X509_CRL>
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objects, respectively.
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The X509_CRL_match() function compares two B<X509_CRL> objects. Unlike the
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X509_CRL_cmp() function, this function compares the whole CRL content instead
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of just the issuer name.
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=head1 RETURN VALUES
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The B<X509> comparison functions return B<-1>, B<0>, or B<1> if object I<a> is
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found to be less than, to match, or be greater than object I<b>, respectively.
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X509_NAME_cmp(), X509_issuer_and_serial_cmp(), X509_issuer_name_cmp(),
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X509_subject_name_cmp(), X509_CRL_cmp(), and X509_CRL_match()
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may return B<-2> to indicate an error.
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=head1 NOTES
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These functions in fact utilize the underlying B<memcmp> of the C library to do
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the comparison job. Data to be compared varies from DER encoding data, hash
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value or B<ASN1_STRING>. The sign of the comparison can be used to order the
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objects but it does not have a special meaning in some cases.
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X509_NAME_cmp() and wrappers utilize the value B<-2> to indicate errors in some
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circumstances, which could cause confusion for the applications.
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=head1 SEE ALSO
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L<i2d_X509_NAME(3)>, L<i2d_X509(3)>
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=head1 COPYRIGHT
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Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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