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(PHP Extension) PBES2 Password-Based Encryption (PBE)Demonstrates how to implement password-based encryption according to the PKCS #5 v2.0: Password-Based Cryptography Standard (published by RSA Laboratories). This example uses PBES2, which ise based on the PBKDF2 function and an underlying block cipher such as RC2, DES, etc.
<?php // The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number. // For example, if using Chilkat v9.5.0.48, then include as shown here: include("chilkat_9_5_0.php"); // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. $crypt = new CkCrypt2(); // Set properties for PBES2 encryption: $crypt->put_CryptAlgorithm('pbes2'); $crypt->put_PbesPassword('mySecretPassword'); // Set the underlying PBE algorithm (and key length): $crypt->put_PbesAlgorithm('rc2'); $crypt->put_KeyLength(128); // Only required for the RC2 algorithm: $crypt->put_Rc2EffectiveKeyLength(128); // By definition, the block encryption algorithm (RC2 or whichever // was selected) will run in CBC mode. Therefore, we need // an IV. The IV is equal in length to the block size of the // algorithm. RC2 has a block size of 8 bytes (regardless of // key length), so set the IV to some value that is 8 bytes // in length: $crypt->SetEncodedIV('0000000000000000','hex'); // Give it some salt: $crypt->SetEncodedSalt('0102030405060708','hex'); // A higher iteration count makes the algorithm more // computationally expensive and therefore exhaustive // searches (for breaking the encryption) is more difficult: $crypt->put_IterationCount(1024); // A hash algorithm needs to be set for PBES2: $crypt->put_HashAlgorithm('sha1'); // Indicate that the encrypted bytes should be returned // as a hex string: $crypt->put_EncodingMode('hex'); $plainText = 'To be encrypted.'; $encryptedText = $crypt->encryptStringENC($plainText); print $encryptedText . "\n"; // Now decrypt: $decryptedText = $crypt->decryptStringENC($encryptedText); print $decryptedText . "\n"; ?> |
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