Perl

56-bit DES Encryption, ECB, CBC modes

See more Encryption Examples

Demonstrates the older 56-bit DES encryption in ECB and CBC modes. 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();

# Specify DES for the encryption algorithm:
$crypt->put_CryptAlgorithm("des");

# CipherMode may be "ecb" or "cbc"
$crypt->put_CipherMode("cbc");

# Keylength is 64 bits (56 bits + 8 parity bits)
$crypt->put_KeyLength(64);

# The padding scheme determines the contents of the bytes
# that are added to pad the result to a multiple of the
# encryption algorithm's block size.  DES has a block
# size of 8 bytes, so encrypted output is always
# a multiple of 8.
$crypt->put_PaddingScheme(0);

# 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");

# An initialization vector is required if using CBC or CFB modes.
# ECB mode does not use an IV.
# The length of the IV is equal to the algorithm's block size.
# It is NOT equal to the length of the key.
$ivHex = "0001020304050607";
$crypt->SetEncodedIV($ivHex,"hex");

# The secret key must equal the size of the key.  For 
# DES, the key must be 8 bytes (i.e. 64-bits).
$keyHex = "0001020304050607";
$crypt->SetEncodedKey($keyHex,"hex");

# Encrypt a string...
# The input string is 44 ANSI characters (i.e. 44 bytes), so
# the output should be 48 bytes (a multiple of 8).
# Because the output is a hex string, it should
# be 96 characters long (2 chars per byte).
$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";