openssl_pkcs7_verify

(PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8)

openssl_pkcs7_verify — Verifies the signature of an S/MIME signed message

Description

openssl_pkcs7_verify(
    string $input_filename,
    int $flags,
    ?string $signers_certificates_filename = null,
    array $ca_info = [],
    ?string $untrusted_certificates_filename = null,
    ?string $content = null,
    ?string $output_filename = null
): bool|int

openssl_pkcs7_verify() reads the S/MIME message contained in the given file and examines the digital signature.

Parameters

input_filename: Path to the message.
flags: flags can be used to affect how the signature is verified - see PKCS7 constants for more information.
signers_certificates_filename: If the signers_certificates_filename is specified, it should be a string holding the name of a file into which the certificates of the persons that signed the messages will be stored in PEM format.
ca_info: If the ca_info is specified, it should hold information about the trusted CA certificates to use in the verification process - see certificate verification for more information about this parameter.
untrusted_certificates_filename: If the untrusted_certificates_filename is specified, it is the filename of a file containing a bunch of certificates to use as untrusted CAs.
content: You can specify a filename with content that will be filled with the verified data, but with the signature information stripped.
output_filename

Return Values

Returns true if the signature is verified, false if it is not correct (the message has been tampered with, or the signing certificate is invalid), or -1 on error.

Changelog

Version	Description
8.0.0	`signers_certificates_filename`, `untrusted_certificates_filename`, `content` and `output_filename` are nullable now.
7.2.0	The `output_filename` parameter was added.

Notes

Note: As specified in RFC 2045, lines may not be longer than 76 characters in the input_filename parameter.

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User Contributed Notes 1 note

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reg1barclay at REMOVETHIS dot live dot it ¶

6 years ago

To verify a .p7m file with openssl_pkcs7_verify() you must convert it to S/MIME format. For example...
<?php
function der2smime($file)
{
    $to=<<<TXT
MIME-Version: 1.0
Content-Disposition: attachment; filename="smime.p7m"
Content-Type: application/x-pkcs7-mime; smime-type=signed-data; name="smime.p7m"
Content-Transfer-Encoding: base64
\n
TXT;
    $from=file_get_contents($file);
    $to.=chunk_split(base64_encode($from));
    return file_put_contents($file,$to);
}
?>

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