Lua

2-Key Triple DES (112 bits)

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Demonstrates 2-Key Triple DES encryption (112-bit 3DES encryption). Lua

local chilkat = require("chilkat")

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

local crypt = chilkat.Crypt2.new()

-- Specify 3DES for the encryption algorithm:
crypt.crypt_algorithm = "3des"

crypt.cipher_mode = "ecb"

-- For 2-Key Triple-DES, use a key length of 128
-- (Given that each byte's msb is a parity bit, the strength is really 112 bits).
crypt.key_length = 128

-- Pad with zeros
crypt.padding_scheme = 3

-- EncodingMode specifies the encoding of the output for
-- encryption, and the input for decryption.
-- It may be "hex", "url", "base64", or "quoted-printable".
crypt.encoding_mode = "hex"

-- Let's create a secret key by using the MD5 hash of a password.
-- The Digest-MD5 algorithm produces a 16-byte hash (i.e. 128 bits)
crypt.hash_algorithm = "md5"
local keyHex = crypt:hash_string_enc("secretPassword")

-- Set the encryption key:
crypt:set_encoded_key(keyHex, "hex")

-- Encrypt
local encStr = crypt:encrypt_string_enc("The quick brown fox jumped over the lazy dog")
print(encStr)

-- Now decrypt:
local decStr = crypt:decrypt_string_enc(encStr)
print(decStr)