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Title "X509_CHECK_PURPOSE 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
X509_check_purpose - Check the purpose of a certificate Header "SYNOPSIS" .Vb 1 #include <openssl/x509v3.h> \& int X509_check_purpose(X509 *x, int id, int ca); .Ve Header "DESCRIPTION" This function checks if certificate x was created with the purpose represented by id. If ca is nonzero, then certificate x is checked to determine if it's a possible \s-1CA\s0 with various levels of certainty possibly returned. The certificate x must be a complete certificate otherwise the function returns an error.

Below are the potential \s-1ID\s0's that can be checked:

.Vb 9 # define X509_PURPOSE_SSL_CLIENT 1 # define X509_PURPOSE_SSL_SERVER 2 # define X509_PURPOSE_NS_SSL_SERVER 3 # define X509_PURPOSE_SMIME_SIGN 4 # define X509_PURPOSE_SMIME_ENCRYPT 5 # define X509_PURPOSE_CRL_SIGN 6 # define X509_PURPOSE_ANY 7 # define X509_PURPOSE_OCSP_HELPER 8 # define X509_PURPOSE_TIMESTAMP_SIGN 9 .Ve

The checks performed take into account the X.509 extensions keyUsage, extendedKeyUsage, and basicConstraints.

Header "RETURN VALUES" For non-CA checks Item "-1 an error condition has occurred"

0

Item " 1 if the certificate was created to perform the purpose represented by id" Item " 0 if the certificate was not created to perform the purpose represented by id"

For \s-1CA\s0 checks the below integers could be returned with the following meanings:

Item "-1 an error condition has occurred"

0

Item " 0 not a CA or does not have the purpose represented by id" Item " 1 is a CA." Item " 2 Only possible in old versions of openSSL when basicConstraints are absent. New versions will not return this value. May be a CA" Item " 3 basicConstraints absent but self signed V1." Item " 4 basicConstraints absent but keyUsage present and keyCertSign asserted." Item " 5 legacy Netscape specific CA Flags present"

Header "COPYRIGHT" Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved. Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.