5 X509_check_purpose - Check the purpose of a certificate
9 #include <openssl/x509v3.h>
11 int X509_check_purpose(X509 *x, int id, int ca)
15 This function checks if certificate I<x> was created with the purpose
16 represented by I<id>. If I<ca> is nonzero, then certificate I<x> is
17 checked to determine if it's a possible CA with various levels of certainty
20 Below are the potential ID's that can be checked:
22 # define X509_PURPOSE_SSL_CLIENT 1
23 # define X509_PURPOSE_SSL_SERVER 2
24 # define X509_PURPOSE_NS_SSL_SERVER 3
25 # define X509_PURPOSE_SMIME_SIGN 4
26 # define X509_PURPOSE_SMIME_ENCRYPT 5
27 # define X509_PURPOSE_CRL_SIGN 6
28 # define X509_PURPOSE_ANY 7
29 # define X509_PURPOSE_OCSP_HELPER 8
30 # define X509_PURPOSE_TIMESTAMP_SIGN 9
38 =item -1 an error condition has occured
40 =item E<32>1 if the certificate was created to perform the purpose represented by I<id>
42 =item E<32>0 if the certificate was not created to perform the purpose represented by I<id>
46 For CA checks the below integers could be returned with the following meanings:
50 =item -1 an error condition has occured
52 =item E<32>0 not a CA or does not have the purpose represented by I<id>
56 =item E<32>2 Only possible in old versions of openSSL when basicConstraints are absent.
57 New versions will not return this value. May be a CA
59 =item E<32>3 basicConstraints absent but self signed V1.
61 =item E<32>4 basicConstraints absent but keyUsage present and keyCertSign asserted.
63 =item E<32>5 legacy Netscape specific CA Flags present
69 Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
70 Licensed under the Apache License 2.0 (the "License"). You may not use this
71 file except in compliance with the License. You can obtain a copy in the file
72 LICENSE in the source distribution or at L<https://www.openssl.org/source/license.html>.