(CkPython) 3DES Encryption, ECB, CBC modes

3DES encryption. The Chilkat encryption component supports Triple-DES in both ECB (Electronic Cookbook) and CBC (Cipher-Block Chaining) cipher modes.

Chilkat Python Downloads install with pip pip3 install chilkat or download... Python Module for Windows, MacOS, Linux, Alpine Linux, Solaris

import chilkat

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

crypt = chilkat.CkCrypt2()

# Specify 3DES for the encryption algorithm:
crypt.put_CryptAlgorithm("3des")

# CipherMode may be "ecb" or "cbc"
crypt.put_CipherMode("cbc")

# KeyLength must be 192.  3DES is technically 168-bits;
# the most-significant bit of each key byte is a parity bit,
# so we must indicate a KeyLength of 192, which includes
# the parity bits.
crypt.put_KeyLength(192)

# 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.  3DES 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 
# 3DES, the key must be 24 bytes (i.e. 192-bits).
keyHex = "000102030405060708090A0B0C0D0E0F0001020304050607"
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)

# Now decrypt:
decStr = crypt.decryptStringENC(encStr)
print(decStr)