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(PHP ActiveX) ARC4 Encryption (ARCFOUR)ARC4 (ARCFOUR) encryption. The Chilkat encryption component supports the ARC4 streaming encryption algorithm.
<?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 the encryption algorithm = "arc4" $crypt->CryptAlgorithm = 'arc4'; // KeyLength may range from 1 byte to 256 bytes. // (i.e. 8 bits to 2048 bits) // ARC4 key sizes are typically in the range of // 40 to 128 bits. // The KeyLength property is specified in bits: $crypt->KeyLength = 128; // Note: The PaddingScheme and CipherMode properties // do not apply w/ ARC4. ARC4 does not encrypt in blocks -- // it is a streaming encryption algorithm. The number of output bytes // is exactly equal to the number of input bytes. // EncodingMode specifies the encoding of the output for // encryption, and the input for decryption. // It may be "hex", "url", "base64", or "quoted-printable". $crypt->EncodingMode = 'hex'; // Note: ARC4 does not utilize initialization vectors. IV's only // apply to block encryption algorithms. // The secret key must equal the size of the key. // For 128-bit encryption, the binary secret key is 16 bytes. $keyHex = '000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F'; $crypt->SetEncodedKey($keyHex,'hex'); // Encrypt a string... // The output length is exactly equal to the input. In this // example, the input string is 44 chars (ANSI bytes) so the // output is 44 bytes -- and when hex encoded results in an // 88-char string (2 chars per byte for the hex encoding). $encStr = $crypt->encryptStringENC('The quick brown fox jumps over the lazy dog.'); print $encStr . "\n"; // Now decrypt: $decStr = $crypt->decryptStringENC($encStr); print $decStr . "\n"; ?> |
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