(PHP 4 >= 4.0.6, PHP 5)
openssl_x509_checkpurpose -- Verifies if a certificate can be used for a particular purpose
openssl_x509_checkpurpose() examines a certificate to
see if it can be used for the specified purpose.
x509certThe examined certificate.
purpose
Table 1. 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? |
cainfo
cainfo should be an array of trusted CA files/dirs
as described in Certificate
Verification. It defaults to an empty array.
untrustedfileIf 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.