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(PHP Extension) RSA Sign Binary Data and Verify (Recover the Original Data)Demonstrates how to RSA sign binary data and then verify/recover the original data. Note: This example uses methods introduced in Chilkat v9.5.0.77.
<?php include("chilkat.php"); // Use "chilkat_9_5_0.php" for versions of Chilkat < 10.0.0 // 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 = new CkPrivateKey(); $success = $privKey->LoadEncryptedPemFile('qa_data/pem/rsa_passwd.pem','passwd'); if ($success != true) { print $privKey->lastErrorText() . "\n"; exit; } $rsa = new CkRsa(); $rsa->ImportPrivateKeyObj($privKey); // We have some binary data (in hex) to sign $originalData = '0102030405060708090A'; $bd = new CkBinData(); $bd->AppendEncoded($originalData,'hex'); // If successful, the contents of bd are replaced with the RSA signature. $success = $rsa->OpenSslSignBd($bd); if ($success != true) { print $rsa->lastErrorText() . "\n"; exit; } // Show the RSA signature in base64 print $bd->getEncoded('base64') . "\n"; // ------------------------------------------ // Get the public key from the private key // pubKey is a CkPublicKey $pubKey = $privKey->GetPublicKey(); // Verify the signature and extract the original data. $rsa2 = new CkRsa(); $rsa2->ImportPublicKeyObj($pubKey); $bVerified = $rsa2->OpenSslVerifyBd($bd); print 'signature verified: ' . $bVerified . "\n"; // Show the original data: print 'original data: ' . $bd->getEncoded('hex') . "\n"; ?> |
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