(Perl) RSA Sign an Encoded Hash

See more RSA Examples

Demonstrates signing a hash (e.g., SHA256) provided as an encoded string (e.g., base64 or hex).

Chilkat Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux

use chilkat();

# 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.

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

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

# Specify the certificate by its common name.
$success = $cert->LoadFromSmartcard("cn=chilkat-rsa-2048");
if ($success == 0) {
    print $cert->lastErrorText() . "\r\n";
    exit;
}

print "Signing with the private key for this cert: " . $cert->subjectCN() . "\r\n";

# Create data to be hashed and signed.
$bd = chilkat::CkBinData->new();

for ($i = 0; $i <= 100; $i++) {
    $bd->AppendEncoded("000102030405060708090A0B0C0D0E0F","hex");
}

$rsa = chilkat::CkRsa->new();

# Use the certificate's private key for signing.
$success = $rsa->SetX509Cert($cert,1);
if ($success == 0) {
    print $rsa->lastErrorText() . "\r\n";
    exit;
}

# We'll first compute the hash and then pass the encoded hash to be signed.
$sha256_base64 = $bd->getHash("sha256","base64");
print "sha256 hash in base64 format: " . $sha256_base64 . "\r\n";

# Pass in the base64 hash and return a base64 signature.
$rsa->put_EncodingMode("base64");
$rsaSig_base64 = $rsa->signHashENC($sha256_base64,"sha256");
if ($success == 0) {
    print $rsa->lastErrorText() . "\r\n";
    exit;
}

print "RSA signature as base64: " . $rsaSig_base64 . "\r\n";