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(PHP Extension) AES XTS ModeDemonstrates the AES-XTS mode of operation. Note: This example requires Chilkat v9.5.0.91 or greater.
<?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. // Here we have a sample from CAVS validatition data: // COUNT = 301 // DataUnitLen = 200 // Key = // 394c97881abd989d29c703e48a72b397 // a7acf51b59649eeea9b33274d8541df4 // i = 4b15c684a152d485fe9937d39b168c29 // PT = 2f3b9dcfbae729583b1d1ffdd16bb6fe2757329435662a78f0 // CT = f3473802e38a3ffef4d4fb8e6aa266ebde553a64528a06463e // Note: The above sample requires an AES-XTS implementation that fully supports ciphertext-stealing // because the data to be encrypted is not an even multiple of the AES block size (i.e. not a multiple of 16 bytes). // Chilkat fully supports AES-XTS with ciphertext stealing. // (i.e. Chilkat implements XEX-based tweaked-codebook mode with ciphertext stealing (XTS)) $key = '394c97881abd989d29c703e48a72b397'; $tweakKey = 'a7acf51b59649eeea9b33274d8541df4'; $dataUnit = '4b15c684a152d485fe9937d39b168c29'; $bd = new CkBinData(); $bd->AppendEncoded('2f3b9dcfbae729583b1d1ffdd16bb6fe2757329435662a78f0','hex'); $crypt = new CkCrypt2(); $crypt->put_CryptAlgorithm('aes'); $crypt->put_CipherMode('xts'); $crypt->put_KeyLength(128); $crypt->SetEncodedKey($key,'hex'); $crypt->XtsSetEncodedTweakKey($tweakKey,'hex'); $crypt->XtsSetEncodedTweakValue($dataUnit,'hex'); // In-place encrypt the contents of bd. $success = $crypt->EncryptBd($bd); print 'CT = ' . $bd->getEncoded('hexlower') . "\n"; // Decrypt to revert back to the unencrypted content: $success = $crypt->DecryptBd($bd); print 'PT = ' . $bd->getEncoded('hexlower') . "\n"; // Output: // CT = f3473802e38a3ffef4d4fb8e6aa266ebde553a64528a06463e // PT = 2f3b9dcfbae729583b1d1ffdd16bb6fe2757329435662a78f0 ?> |
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