Perl

ARC4 Encryption (ARCFOUR)

See more Encryption Examples

ARC4 (ARCFOUR) encryption. The Chilkat encryption component supports the ARC4 streaming encryption algorithm. Perl

use chilkat();

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

$crypt = chilkat::CkCrypt2->new();

# Set the encryption algorithm = "arc4"	
$crypt->put_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->put_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->put_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 . "\r\n";

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