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openssl_x509_checkpurpose
Verifies if a certificate can be used for a particular purpose
(PHP 4 >= 4.0.6, PHP 5)
int openssl_x509_checkpurpose ( mixed x509cert, int purpose [, array cainfo [, string untrustedfile]] )
openssl_x509_checkpurpose() examines a certificate to see if it can be used for the specified purpose.
Parameters
- x509cert
The examined certificate.
- purpose
Table 235. openssl_x509_checkpurpose() purposes
Constant Description X509_PURPOSE_SSL_CLIENT Can the certificate be used for the client side of an SSL connection? X509_PURPOSE_SSL_SERVER Can the certificate be used for the server side of an SSL connection? X509_PURPOSE_NS_SSL_SERVER Can the cert be used for Netscape SSL server? X509_PURPOSE_SMIME_SIGN Can the cert be used to sign S/MIME email? X509_PURPOSE_SMIME_ENCRYPT Can the cert be used to encrypt S/MIME email? X509_PURPOSE_CRL_SIGN Can the cert be used to sign a certificate revocation list (CRL)? X509_PURPOSE_ANY Can the cert be used for Any/All purposes?
These options are not bitfields - you may specify one only!- cainfo
cainfo should be an array of trusted CA files/dirs as described in Certificate Verification. It defaults to an empty array.
- untrustedfile
If specified, this should be the name of a PEM encoded file holding certificates that can be used to help verify the certificate, although no trust in placed in the certificates that come from that file.