Perl

RSA Hash Binary Data and Sign (and Verify)

See more RSA Examples

Demonstrates how to sign the hash of binary data. Also demonstrates how to verify the RSA signature. Perl

use chilkat();

$success = 0;

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

# Load an RSA private key for signing.
$privKey = chilkat::CkPrivateKey->new();
$success = $privKey->LoadEncryptedPemFile("qa_data/pem/rsa_passwd.pem","passwd");
if ($success == 0) {
    print $privKey->lastErrorText() . "\r\n";
    exit;
}

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

# We have some binary data (in hex) to sign
$originalData = "0102030405060708090A";
$bdData = chilkat::CkBinData->new();
$bdData->AppendEncoded($originalData,"hex");

# Hash (SHA-256) and sign the hash:
$bdSignature = chilkat::CkBinData->new();
$success = $rsa->SignBd($bdData,"sha256",$bdSignature);
if ($success == 0) {
    print $rsa->lastErrorText() . "\r\n";
    exit;
}

# Show the RSA signature in base64
print $bdSignature->getEncoded("base64") . "\r\n";

# ------------------------------------------
# Get the public key from the private key
$pubKey = chilkat::CkPublicKey->new();
$privKey->ToPublicKey($pubKey);

# Verify the signature..
$rsa2 = chilkat::CkRsa->new();
$rsa2->UsePublicKey($pubKey);

$bVerified = $rsa2->VerifyBd($bdData,"sha256",$bdSignature);
print "signature verified: " . $bVerified . "\r\n";