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# openssl_x509_checkpurpose

(PHP 4 >= 4.0.6, PHP 5)

openssl_x509_checkpurpose -- Verifies if a certificate can be used for a particular purpose

## Description

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?

These options are not bitfields - you may specify one only!

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