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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. require 'chilkat' crypt = Chilkat::CkCrypt2.new() success = crypt.UnlockComponent("Anything for 30-day trial") if (success != true) print "Crypt component unlock failed" + "\n" exit end 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 true to initialize the ARC4 PRNG with the key. crypt.put_FirstChunk(true) crypt.put_LastChunk(false) encryptedText = crypt.encryptStringENC(strData) print encryptedText + "\n"; # Set FirstChunk to false to continue encrypting # without re-initializing the ARC4 PRNG crypt.put_FirstChunk(false) for i in 1 .. 15 # Repeatedly encrypting the same 8 bytes of data # produces then pseudo-random sequence. encryptedText = crypt.encryptStringENC(strData) print encryptedText + "\n"; end |
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