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(PHP Extension) PBES1 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 PBES1, which ise based on the PBKDF1 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 PBES1 encryption: $crypt->put_CryptAlgorithm('pbes1'); $crypt->put_PbesPassword('mySecretPassword'); // Set the underlying PBE algorithm (and key length): // For PBES1, the underlying algorithm must be either // 56-bit DES or 64-bit RC2 // (this is according to the PKCS#5 specifications at // http://www.rsa.com/rsalabs/node.asp?id=2127 ) $crypt->put_PbesAlgorithm('rc2'); $crypt->put_KeyLength(64); // The salt for PBKDF1 is always 8 bytes: $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 PBES1: $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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