204 lines
7.2 KiB
Groff
Executable File
204 lines
7.2 KiB
Groff
Executable File
.\" Automatically generated by Pod::Man 2.25 (Pod::Simple 3.16)
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.\" ========================================================================
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.\"
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.IX Title "X509_CMP 3"
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.TH X509_CMP 3 "2020-03-02" "3.0.0-dev" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "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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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/x509.h>
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\&
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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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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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This set of functions are used to compare X509 objects, including X509
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certificates, X509 \s-1CRL\s0 objects and various values in an X509 certificate.
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.PP
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The \fIX509_cmp()\fR function compares two \fBX509\fR objects indicated by parameters
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\&\fBa\fR and \fBb\fR. The comparison is based on the \fBmemcmp\fR result of the hash
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values of two \fBX509\fR objects and the canonical (\s-1DER\s0) encoding values.
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.PP
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The \fIX509_NAME_cmp()\fR function compares two \fBX509_NAME\fR objects indicated by
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parameters \fBa\fR and \fBb\fR. The comparison is based on the \fBmemcmp\fR result of
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the canonical (\s-1DER\s0) encoding values of the two objects. \fIi2d_X509_NAME\fR\|(3)
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has a more detailed description of the \s-1DER\s0 encoding of the \fBX509_NAME\fR structure.
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.PP
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The \fIX509_issuer_and_serial_cmp()\fR function compares the serial number and issuer
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values in the given \fBX509\fR objects \fBa\fR and \fBb\fR.
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.PP
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The \fIX509_issuer_name_cmp()\fR, \fIX509_subject_name_cmp()\fR and \fIX509_CRL_cmp()\fR functions
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are effectively wrappers of the \fIX509_NAME_cmp()\fR function. These functions compare
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issuer names and subject names of the objects, or issuers of \fBX509_CRL\fR
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objects, respectively.
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.IX Xref "509"
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.PP
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The \fIX509_CRL_match()\fR function compares two \fBX509_CRL\fR objects. Unlike the
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\&\fIX509_CRL_cmp()\fR function, this function compares the whole \s-1CRL\s0 content instead
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of just the issuer name.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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Like common memory comparison functions, the \fBX509\fR comparison functions return
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an integer less than, equal to, or greater than zero if object \fBa\fR is found to
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be less than, to match, or be greater than object \fBb\fR, respectively.
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.PP
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\&\fIX509_NAME_cmp()\fR, \fIX509_issuer_and_serial_cmp()\fR, \fIX509_issuer_name_cmp()\fR,
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\&\fIX509_subject_name_cmp()\fR and \fIX509_CRL_cmp()\fR may return \fB\-2\fR to indicate an error.
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.SH "NOTES"
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.IX Header "NOTES"
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These functions in fact utilize the underlying \fBmemcmp\fR of the C library to do
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the comparison job. Data to be compared varies from \s-1DER\s0 encoding data, hash
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value or \fB\s-1ASN1_STRING\s0\fR. 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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.PP
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\&\fIX509_NAME_cmp()\fR and wrappers utilize the value \fB\-2\fR to indicate errors in some
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circumstances, which could cause confusion for the applications.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIi2d_X509_NAME\fR\|(3), \fIi2d_X509\fR\|(3)
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). 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 \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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