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(PHP Extension) RSA Encrypt and Decrypt Credit Card NumbersPHP Extension sample code to RSA public-key encrypt and decrypt credit card numbers. The RSA key is loaded from an unencrypted PKCS8 file. Chilkat provides many ways of setting the key -- loading from both encrypted and unencrypted PEM, PKCS8, DER, PVK, etc. Keys may be loaded from files or in-memory representations. (The RSA component also provides the ability to generate RSA keys.) Note: This example requires Chilkat v11.0.0 or greater.
<?php include("chilkat.php"); $success = false; // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. $rsa = new CkRsa(); $privKey = new CkPrivateKey(); // Load an RSA private key from a file: $success = $privKey->LoadAnyFormatFile('rsaPrivateKey.key',''); if ($success == false) { print $privKey->lastErrorText() . "\n"; exit; } // Get the public part of the private key. $pubKey = new CkPublicKey(); $privKey->ToPublicKey($pubKey); $success = $rsa->UsePublicKey($pubKey); if ($success == false) { print $rsa->lastErrorText() . "\n"; exit; } // Encrypt a VISA credit card number: // 1234-5678-0000-9999 $ccNumber = '1234567800009999'; $usePrivateKey = false; $rsa->put_EncodingMode('base64'); $encryptedStr = $rsa->encryptStringENC($ccNumber,$usePrivateKey); print 'Encrypted:' . "\n"; print $encryptedStr . "\n"; // Now decrypt: $rsaDecryptor = new CkRsa(); $rsaDecryptor->put_EncodingMode('base64'); $rsaDecryptor->UsePrivateKey($privKey); $usePrivateKey = true; $decryptedStr = $rsaDecryptor->decryptStringENC($encryptedStr,$usePrivateKey); print 'Decrypted:' . "\n"; print $decryptedStr . "\n"; // Important: RSA encryption should only be used to encrypt small amounts of data. // It is typically used for encrypting symmetric encryption // keys such that a symmetric encryption algorithm, such as // AES is then used to encrypt/decrypt bulk data ?> |
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