openssl_pkcs7_sign

(PHP 4 >= 4.0.6, PHP 5, PHP 7)

openssl_pkcs7_sign — Sign an S/MIME message

Description

openssl_pkcs7_sign ( string $infilename , string $outfilename , mixed $signcert , mixed $privkey , array $headers [, int $flags = PKCS7_DETACHED [, string $extracerts ]] ) : bool

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.

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Parameters

infilename: The input file you are intending to digitally sign.
outfilename: The file which the digital signature will be written to.
signcert: The X.509 certificate used to digitally sign infilename. See Key/Certificate parameters for a list of valid values.
privkey: privkey is the private key corresponding to signcert. See Public/Private Key parameters for a list of valid values.
headers: 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: flags can be used to alter the output - see PKCS7 constants.
extracerts: 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.

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Return Values

Returns TRUE on success or FALSE on failure.

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Examples

Example #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", "file://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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Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-openssl-pkcs7-sign.html

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References

Manuel PHP : http://php.net

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