Sign a file

Description

openssl_cms_sign(
    string $input_filename,
    string $output_filename,
    OpenSSLCertificate|string $certificate,
    OpenSSLAsymmetricKey|OpenSSLCertificate|array|string $private_key,
    ?array $headers,
    int $flags = 0,
    int $encoding = OPENSSL_ENCODING_SMIME,
    ?string $untrusted_certificates_filename = null
): bool

This function signs a file with an X.509 certificate and key.

Parameters

input_filename: The name of the file to be signed.
output_filename: The name of the file to deposit the results.
certificate: The signing certificate. See Key/Certificate parameters for a list of valid values.
private_key: The key associated with certificate. See Key/Certificate parameters for a list of valid values.
headers: An array of headers to be included in S/MIME output.
flags: Flags to be passed to cms_sign().
encoding: The encoding of the output file. One of OPENSSL_ENCODING_SMIME, OPENSSL_ENCODING_DER or OPENSSL_ENCODING_PEM.
untrusted_certificates_filename: Intermediate certificates to be included in the signature.

Return Values

Returns true on success or false on failure.

Examples

Example #1 openssl_cms_sign() example

<?php

openssl_cms_sign('input.txt', 'output.txt', 'file://cert.pem', 'file://privkey.pem', null, OPENSSL_CMS_BINARY, OPENSSL_ENCODING_DER, 'chain.pem');
?>