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(PHP ActiveX) RSA Encrypt and Decrypt Credit Card NumbersPHP ActiveX 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.)
<?php // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Rsa') $rsa = new COM("Chilkat.Rsa"); // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.PrivateKey') $key = new COM("Chilkat.PrivateKey"); // Load an RSA private key from a file: $success = $key->LoadAnyFormatFile('rsaPrivateKey.key',''); if ($success != 1) { print $key->LastErrorText . "\n"; exit; } // Get the key as XML: $keyXml = $key->getXml(); // We'll encrypt with the public key and decrypt with the private // key. (It's also possible to do the reverse.) // Note: An RSA private key is composed of different parts internally: modulus, exponent, P, Q, etc. // An RSA public-key is a sub-set of the private key. // Therefore, when you have a private key, you really have // both public and private keys. $success = $rsa->ImportPublicKey($keyXml); if ($success != 1) { print $rsa->LastErrorText . "\n"; exit; } // Encrypt a VISA credit card number: // 1234-5678-0000-9999 $ccNumber = '1234567800009999'; $usePrivateKey = 0; $rsa->EncodingMode = 'base64'; $encryptedStr = $rsa->encryptStringENC($ccNumber,$usePrivateKey); print 'Encrypted:' . "\n"; print $encryptedStr . "\n"; // Now decrypt: // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Rsa') $rsaDecryptor = new COM("Chilkat.Rsa"); $rsaDecryptor->EncodingMode = 'base64'; $success = $rsaDecryptor->ImportPrivateKey($keyXml); $usePrivateKey = 1; $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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