PHP Extension
Create PEM-encoded PKCS#7 Detached Signature

Demonstrates how to create a PKCS7 PEM-encoded object containing a detached signature.
Chilkat PHP Extension Downloads

PHP Extension
<?php

include("chilkat.php");

$success = false;

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

$cert = new CkCert();

// Load the cert and private key.
$success = $cert->LoadPfxFile('qa_data/pfx/myCertAndKey.p12','password');
if ($success != true) {
    print $cert->lastErrorText() . "\n";
    exit;
}

$crypt = new CkCrypt2();

$success = $crypt->SetSigningCert($cert);
if ($success != true) {
    print $crypt->lastErrorText() . "\n";
    exit;
}

// Use SHA-256
$crypt->put_HashAlgorithm('sha256');

// Hash the utf-8 byte representation of the string
$crypt->put_Charset('utf-8');

// Return the result in base64
$crypt->put_EncodingMode('base64Mime');

// Sign some text to create a detached signature (i.e. a signature that does not include the signed data)
$textToSign = 'This is the text to be hashed and signed.';
$sigBase64 = $crypt->signStringENC($textToSign);
if ($crypt->get_LastMethodSuccess() != true) {
    print $crypt->lastErrorText() . "\n";
    exit;
}

print $sigBase64 . "\n";

// The result:

// MIIWbgYJKoZIhvcNAQcCoIIWXzCCFlsCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg
// ghMXMIIFuzCCA6OgAwIBAgIIVwoRl0LE48wwDQYJKoZIhvcNAQELBQAwazELMAkGA1UEBhMCSVQx
// ...
// ...

// If we want it in PEM format with just LF line-endings:
$sb = new CkStringBuilder();
// Just LF line endings, not CRLF.
$crlf = false;
$sb->AppendLine('-----BEGIN PKCS7-----',$crlf);
$sb->Append($sigBase64);
$sb->AppendLine('-----END PKCS7-----',$crlf);
$sb->ToLF();

// Save to a file.
$sb->WriteFile('c:/temp/qa_output/sig.pem','utf-8',false);

// Examine..
print $sb->getAsString() . "\n";

// Result is:

// -----BEGIN PKCS7-----
// MIIWbgYJKoZIhvcNAQcCoIIWXzCCFlsCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg
// ghMXMIIFuzCCA6OgAwIBAgIIVwoRl0LE48wwDQYJKoZIhvcNAQELBQAwazELMAkGA1UEBhMCSVQx
// DjAMBgNVBAcMBU1pbGFuMSMwIQYDVQQKDBpBY3RhbGlzIFMucC5BLi8wMzM1ODUyMDk2NzEnMCUG
// A1UEAwweQWN0YWxpcyBBdXRoZW50aWNhdGlvbiBSb290IENBMB4XDTExMDkyMjExMjIwMloXDTMw
// MDkyMjExMjIwMlowazELMAkGA1UEBhMCSVQxDjAMBgNVBAcMBU1pbGFuMSMwIQYDVQQKDBpBY3Rh
// bGlzIFMucC5BLi8wMzM1ODUyMDk2NzEnMCUGA1UEAwweQWN0YWxpcyBBdXRoZW50aWNhdGlvbiBS
// b290IENBMIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAp8bEpSmkLO/lGMWwUKNvUTuf
// ClrJwkg4CsIcoBh/kbWHuUA/3R1oHwiD1S0eiKD4j1aPbZkCkpAW1V8IbInX4ay8IMKx4INRimlN
// AJZaby/ARH6jDuSRzVju3PvHHkVH3Se5CAGfpiEd9UEtL0z9KK3giq0itFZljoZUj5NDKd45Rnij
// MCO6zfB9E1fAXdKDa0hMxKufgFpbOr3JpyI/gCczWw63igxdBzcIy2zSekciRDXFzMwujt0q7bd9
// ...
// ...
// -----END PKCS7-----

?>