README.md

P7M Extractor

A simple class that allows to extract the original file from a signed p7m file.

Requirements

• PHP 7.0+
• Symphony Prcess 3.3 or 4.0+

Requirements

Behind the scenes this package leverages openssl. You can verify if the binary installed on your system by issueing this command:

which openssl

If it is installed it will return the path to the binary.

Installation

You can install the package via composer:

composer require filippo-toso/p7m-extractor

Usage

Extracting text from a pdf is easy. P7M::extract('test.pdf.p7m', 'test.pdf', 'C:/Program Files/OpenSSL-Win64/bin/openssl.exe')

use FilippoToso\P7MExtractor\P7M;

$success = (new P7M())
    ->setSource('source.pdf.p7m')
    ->setDestination('destination.pdf')
    ->save();

Or easier:

use FilippoToso\P7MExtractor\P7M;

$success = P7M::convert('source.pdf.p7m', 'destination.pdf');

By default the package will assume that the openssl command is located at /usr/bin/openssl. If it is located elsewhere pass its binary path to constructor

use FilippoToso\P7MExtractor\P7M;

$success = (new P7M('/custom/path/to/openssl'))
    ->setSource('source.pdf.p7m')
    ->setDestination('destination.pdf')
    ->save();

or as the last parameter to the extract static method:

$success = P7M::convert('source.pdf.p7m', 'destination.pdf', '/custom/path/to/openssl');

If you want to get the content as a string instead of saving it to a file you can use the get() method or the extract() static method.

By default the package will assume that the openssl command is smime. If necessary you can use cms instead

use FilippoToso\P7MExtractor\P7M;

$success = (new P7M('/custom/path/to/openssl'))
    ->setCommand('cms')
    ->setSource('source.pdf.p7m')
    ->setDestination('destination.pdf')
    ->save();

You can also add another param to the command line, for example:

use FilippoToso\P7MExtractor\P7M;

$success = (new P7M('/custom/path/to/openssl'))
    ->setCommand('cms')
    ->setExtraParam('-no_attr_verify')
    ->setSource('source.pdf.p7m')
    ->setDestination('destination.pdf')
    ->save();

The last example is usefull to solve issues on some kind of p7m files (probably old ones):

cms solve problemes like Error reading S/MIME message - Exit Code: 2 (Misuse of shell builtins)

-no_attr_verify is usefull when receiving errors like this: rsa routines:int_rsa_verify:bad signature - CMS routines:CMS_SignerInfo_verify:verification failure

(no_attr_verify: Do not verify the signer's attribute of a signature)