Perl

PKCS7 Sign Text using RSA 2048, SHA256, Base64 Output

See more Digital Signatures Examples

Demonstrates how to sign text using 2048-bit RSA with SHA256, producing PKCS#7 output in Base64. The certificate w/ private key used for signing is loaded from a .p12/.pfx file. 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.  Whatever the private key happens to be,
# such as RSA or ECC, then Chilkat will use it.  If the private key is 
# a 2048-bit RSA key, then that's what will be used..
$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("base64");

# Sign some text..
$textToSign = "This is the text to be hashed and signed.";
$sigBase64 = $crypt->opaqueSignStringENC($textToSign);
if ($crypt->get_LastMethodSuccess() != 1) {
    print $crypt->lastErrorText() . "\r\n";
    exit;
}

print $sigBase64 . "\r\n";

# The result:
# MIIS2wYJKoZIhvcNAQc ... zGeeY4Oxg==