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(PHP ActiveX) 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 // 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.Crypt2') $crypt = new COM("Chilkat.Crypt2"); // Set properties for PBES2 encryption: $crypt->CryptAlgorithm = 'pbes2'; $crypt->PbesPassword = 'mySecretPassword'; // Set the underlying PBE algorithm (and key length): $crypt->PbesAlgorithm = 'rc2'; $crypt->KeyLength = 128; // Only required for the RC2 algorithm: $crypt->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->IterationCount = 1024; // A hash algorithm needs to be set for PBES2: $crypt->HashAlgorithm = 'sha1'; // Indicate that the encrypted bytes should be returned // as a hex string: $crypt->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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