openssl_x509_checkpurpose
(PHP 4 >= 4.0.6, PHP 5)
openssl_x509_checkpurpose -- Verifies if a certificate can be used for a particular purposeDescription
int openssl_x509_checkpurpose ( mixed x509cert, int purpose [, array cainfo [, string untrustedfile]] )Returns TRUE if the certificate can be used for the intended purpose, FALSE if it cannot, or -1 on error.
openssl_x509_checkpurpose() examines the certificate
specified by x509cert to see if it can be used for
the purpose specified by purpose.
cainfo should be an array of trusted CA files/dirs
as described in Certificate
Verification. It defaults to an empty array.
untrustedfile, if specified,
is 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.
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? |
