PHP Extension

56-bit DES Encryption, ECB, CBC modes

See more Encryption Examples

Demonstrates the older 56-bit DES encryption in ECB and CBC modes. PHP Extension

<?php

include("chilkat.php");

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

$crypt = new CkCrypt2();

// Specify DES for the encryption algorithm:
$crypt->put_CryptAlgorithm('des');

// CipherMode may be "ecb" or "cbc"
$crypt->put_CipherMode('cbc');

// Keylength is 64 bits (56 bits + 8 parity bits)
$crypt->put_KeyLength(64);

// The padding scheme determines the contents of the bytes
// that are added to pad the result to a multiple of the
// encryption algorithm's block size.  DES has a block
// size of 8 bytes, so encrypted output is always
// a multiple of 8.
$crypt->put_PaddingScheme(0);

// EncodingMode specifies the encoding of the output for
// encryption, and the input for decryption.
// It may be "hex", "url", "base64", or "quoted-printable".
$crypt->put_EncodingMode('hex');

// An initialization vector is required if using CBC or CFB modes.
// ECB mode does not use an IV.
// The length of the IV is equal to the algorithm's block size.
// It is NOT equal to the length of the key.
$ivHex = '0001020304050607';
$crypt->SetEncodedIV($ivHex,'hex');

// The secret key must equal the size of the key.  For 
// DES, the key must be 8 bytes (i.e. 64-bits).
$keyHex = '0001020304050607';
$crypt->SetEncodedKey($keyHex,'hex');

// Encrypt a string...
// The input string is 44 ANSI characters (i.e. 44 bytes), so
// the output should be 48 bytes (a multiple of 8).
// Because the output is a hex string, it should
// be 96 characters long (2 chars per byte).
$encStr = $crypt->encryptStringENC('The quick brown fox jumps over the lazy dog.');
print $encStr . "\n";

// Now decrypt:
$decStr = $crypt->decryptStringENC($encStr);
print $decStr . "\n";

?>