1=pod
2
3=head1 NAME
4
5X509_ALGOR_dup, X509_ALGOR_set0, X509_ALGOR_get0, X509_ALGOR_set_md, X509_ALGOR_cmp - AlgorithmIdentifier functions
6
7=head1 SYNOPSIS
8
9 #include <openssl/x509.h>
10
11 X509_ALGOR *X509_ALGOR_dup(X509_ALGOR *alg);
12 int X509_ALGOR_set0(X509_ALGOR *alg, ASN1_OBJECT *aobj, int ptype, void *pval);
13 void X509_ALGOR_get0(const ASN1_OBJECT **paobj, int *pptype,
14                      const void **ppval, const X509_ALGOR *alg);
15 void X509_ALGOR_set_md(X509_ALGOR *alg, const EVP_MD *md);
16 int X509_ALGOR_cmp(const X509_ALGOR *a, const X509_ALGOR *b);
17
18=head1 DESCRIPTION
19
20X509_ALGOR_dup() returns a copy of B<alg>.
21
22X509_ALGOR_set0() sets the algorithm OID of B<alg> to B<aobj> and the
23associated parameter type to B<ptype> with value B<pval>. If B<ptype> is
24B<V_ASN1_UNDEF> the parameter is omitted, otherwise B<ptype> and B<pval> have
25the same meaning as the B<type> and B<value> parameters to ASN1_TYPE_set().
26All the supplied parameters are used internally so must B<NOT> be freed after
27this call.
28
29X509_ALGOR_get0() is the inverse of X509_ALGOR_set0(): it returns the
30algorithm OID in B<*paobj> and the associated parameter in B<*pptype>
31and B<*ppval> from the B<AlgorithmIdentifier> B<alg>.
32
33X509_ALGOR_set_md() sets the B<AlgorithmIdentifier> B<alg> to appropriate
34values for the message digest B<md>.
35
36X509_ALGOR_cmp() compares B<a> and B<b> and returns 0 if they have identical
37encodings and non-zero otherwise.
38
39=head1 RETURN VALUES
40
41X509_ALGOR_dup() returns a valid B<X509_ALGOR> structure or NULL if an error
42occurred.
43
44X509_ALGOR_set0() returns 1 on success or 0 on error.
45
46X509_ALGOR_get0() and X509_ALGOR_set_md() return no values.
47
48X509_ALGOR_cmp() returns 0 if the two parameters have identical encodings and
49non-zero otherwise.
50
51=head1 COPYRIGHT
52
53Copyright 2002-2018 The OpenSSL Project Authors. All Rights Reserved.
54
55Licensed under the OpenSSL license (the "License").  You may not use
56this file except in compliance with the License.  You can obtain a copy
57in the file LICENSE in the source distribution or at
58L<https://www.openssl.org/source/license.html>.
59
60=cut
61