Perl

RSA Sign utf-8 Bytes of String to get Base64 RSA Signature

See more Apple Keychain Examples

Demonstrates how RSA sign the utf-8 byte representation of a string to get the signature in base64 format. Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

# Assuming the smartcard/USB token is installed with the correct drivers from the manufacturer,
# this code can work on multiple platforms including Windows, MacOS, Linux, and iOS.

# Chilkat automatically detects and determines the way in which the HSM is used,
# which can be by PKCS11, Apple Keychain, Microsoft CNG / Crypto API, or ScMinidriver.

my $cert = Chilkat2::Cert->new;

# Set the token/smartcard PIN prior to loading.
$cert->SmartCardPin('123456');

# Specify the certificate by its common name.
my $success = $cert->LoadFromSmartcard('cn=chilkat-rsa-2048');
if (!$success) {
    print $cert->LastErrorText, "\n";
    exit;
}

print 'Signing with cert: ', $cert->SubjectCN, "\n";

# Create a string to be hashed and signed.
my $sb = Chilkat2::StringBuilder->new;
my $crlfLineEnding = 1;
for my $i (0 .. 10) {
    $sb->AppendLine('This is a test.', $crlfLineEnding);
}

my $rsa = Chilkat2::Rsa->new;

# Use the certificate's private key for signing.
$success = $rsa->SetX509Cert($cert, 1);
if (!$success) {
    print $rsa->LastErrorText, "\n";
    exit;
}

# Sign the SHA-256 hash of the utf-8 byte representation of the contents of sb
# Return the signature in base64 format.
$rsa->EncodingMode('base64');
$rsa->Charset('utf-8');
my $stringToSign = $sb->GetAsString();
my $sigBase64 = $rsa->SignStringENC($stringToSign, 'sha256');
if (!$rsa->LastMethodSuccess) {
    print $rsa->LastErrorText, "\n";
    exit;
}

print 'RSA signature as base64: ', $sigBase64, "\n";