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# openssl_pkcs7_sign

(PHP 4 >= 4.0.6, PHP 5)

openssl_pkcs7_sign -- Sign an S/MIME message

## Description

bool openssl_pkcs7_sign ( string infilename, string outfilename, mixed signcert, mixed privkey, array headers [, int flags [, string extracerts]] )

openssl_pkcs7_sign() takes the contents of the file named `infilename` and signs them using the certificate and its matching private key specified by `signcert` and `privkey` parameters.

`headers` is an array of headers that will be prepended to the data after it has been signed (see openssl_pkcs7_encrypt() for more information about the format of this parameter.

`flags` can be used to alter the output - see PKCS7 constants - if not specified, it defaults to PKCS7_DETACHED.

`extracerts` specifies the name of a file containing a bunch of extra certificates to include in the signature which can for example be used to help the recipient to verify the certificate that you used.

Exemplo 1. openssl_pkcs7_sign() example
`<?php // the message you want to sign so that recipient can be sure it was you that // sent it $data = <<<EOD You have my authorization to spend $10,000 on dinner expenses. The CEO EOD; // save message to file $fp = fopen("msg.txt", "w"); fwrite($fp, $data); fclose($fp); // encrypt it if (openssl_pkcs7_sign("msg.txt", "signed.txt", "mycert.pem", array("file://mycert.pem", "mypassphrase"), array("To" => "joes@example.com", // keyed syntax "From: HQ <ceo@example.com>", // indexed syntax "Subject" => "Eyes only") )) { // message signed - send it! exec(ini_get("sendmail_path") . " < signed.txt"); } ?>`

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