Perl

ARC4 Encryption (ARCFOUR)

See more Encryption Examples

ARC4 (ARCFOUR) encryption. The Chilkat encryption component supports the ARC4 streaming encryption algorithm. Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

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

my $crypt = Chilkat2::Crypt2->new;

# 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.
my $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).
my $encStr = $crypt->EncryptStringENC('The quick brown fox jumps over the lazy dog.');
print $encStr, "\n";

# Now decrypt:
my $decStr = $crypt->DecryptStringENC($encStr);
print $decStr, "\n";