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Generate Psuedo-Random Data using ARC4 as a PRNGThis example demonstrates how to use the ARC4 stream encryption algorithm as a pseudo-random number generator (PRNG). This example generates the random data as hex encoded strings. The EncryptStringENC method can be replaced with EncryptBytes to generate random bytes. Note: This example uses new features available in the pre-release, or any official new version released after 17-October-2007.
use chilkat; $crypt = new chilkat::CkCrypt2(); $success = $crypt->UnlockComponent("Anything for 30-day trial"); if ($success != 1) { print "Crypt component unlock failed" . "\n"; exit; } $crypt->put_CryptAlgorithm("arc4"); $crypt->put_KeyLength(128); $crypt->SetEncodedKey("000102030405060708090A0B0C0D0E0F","hex"); $crypt->put_EncodingMode("hex"); # We will repeatedly feed these 8-bytes of data to # the ARC4 stream encryptor to generate our pseudo-random # sequence. $strData = "012345678"; # Set FirstChunk to 1 to initialize the ARC4 PRNG with the key. $crypt->put_FirstChunk(1); $crypt->put_LastChunk(0); $encryptedText = $crypt->encryptStringENC($strData); print $encryptedText . "\r\n"; # Set FirstChunk to 0 to continue encrypting # without re-initializing the ARC4 PRNG $crypt->put_FirstChunk(0); for ($i = 1; $i <= 16; $i++) { # Repeatedly encrypting the same 8 bytes of data # produces then pseudo-random sequence. $encryptedText = $crypt->encryptStringENC($strData); print $encryptedText . "\r\n"; } |
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