PHP Manual: Verify a CMS signature

Description

bool openssl_cms_verify(
    string $input_filename,
    int $flags = 0,
    stringnull $certificates = null,
    array $ca_info = [],
    stringnull $untrusted_certificates_filename = null,
    stringnull $content = null,
    stringnull $pk7 = null,
    stringnull $sigfile = null,
    int $encoding = OPENSSL_ENCODING_SMIME
)

This function verifies a CMS signature, either attached or detached, with the specified encoding.

Parameters

input_filename: The input file.
flags: Flags to pass to cms_verify.
certificates: A file with the signer certificate and optionally intermediate certificates.
ca_info: An array containing self-signed certificate authority certificates.
untrusted_certificates_filename: A file containing additional intermediate certificates.
content: A file pointing to the content when signatures are detached.
pk7
sigfile: A file to save the signature to.
encoding: The encoding of the input file. One of OPENSSL_ENCODING_SMIME, OPENSSL_ENCODING_DER or OPENSSL_ENCODING_PEM.

Return Values

Returns true on success or false on failure.