Perl

Create PEM-encoded PKCS#7 Detached Signature

See more Digital Signatures Examples

Demonstrates how to create a PKCS7 PEM-encoded object containing a detached signature. Perl

use chilkat();

$success = 0;

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

$cert = chilkat::CkCert->new();

# Load the cert and private key.
$success = $cert->LoadPfxFile("qa_data/pfx/myCertAndKey.p12","password");
if ($success != 1) {
    print $cert->lastErrorText() . "\r\n";
    exit;
}

$crypt = chilkat::CkCrypt2->new();

$success = $crypt->SetSigningCert($cert);
if ($success != 1) {
    print $crypt->lastErrorText() . "\r\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() != 1) {
    print $crypt->lastErrorText() . "\r\n";
    exit;
}

print $sigBase64 . "\r\n";

# The result:

# MIIWbgYJKoZIhvcNAQcCoIIWXzCCFlsCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg
# ghMXMIIFuzCCA6OgAwIBAgIIVwoRl0LE48wwDQYJKoZIhvcNAQELBQAwazELMAkGA1UEBhMCSVQx
# ...
# ...

# If we want it in PEM format with just LF line-endings:
$sb = chilkat::CkStringBuilder->new();
# Just LF line endings, not CRLF.
$crlf = 0;
$sb->AppendLine("-----BEGIN PKCS7-----",$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",0);

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

# Result is:

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