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(PHP ActiveX) RSA Hash Binary Data and Sign (and Verify)Demonstrates how to sign the hash of binary data. Also demonstrates how to verify the RSA signature. Note: This example uses methods introduced in Chilkat v9.5.0.77.
<?php // 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. // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.PrivateKey') $privKey = new COM("Chilkat.PrivateKey"); $success = $privKey->LoadEncryptedPemFile('qa_data/pem/rsa_passwd.pem','passwd'); if ($success != 1) { print $privKey->LastErrorText . "\n"; exit; } // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Rsa') $rsa = new COM("Chilkat.Rsa"); $rsa->ImportPrivateKeyObj($privKey); // We have some binary data (in hex) to sign $originalData = '0102030405060708090A'; // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.BinData') $bdData = new COM("Chilkat.BinData"); $bdData->AppendEncoded($originalData,'hex'); // Hash (SHA-256) and sign the hash: // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.BinData') $bdSignature = new COM("Chilkat.BinData"); $success = $rsa->SignBd($bdData,'sha256',$bdSignature); if ($success != 1) { print $rsa->LastErrorText . "\n"; exit; } // Show the RSA signature in base64 print $bdSignature->getEncoded('base64') . "\n"; // ------------------------------------------ // Get the public key from the private key // pubKey is a Chilkat.PublicKey $pubKey = $privKey->GetPublicKey(); // Verify the signature.. // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Rsa') $rsa2 = new COM("Chilkat.Rsa"); $rsa2->ImportPublicKeyObj($pubKey); $bVerified = $rsa2->VerifyBd($bdData,'sha256',$bdSignature); print 'signature verified: ' . $bVerified . "\n"; ?> |
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