Chilkat2-Python

56-bit DES Encryption, ECB, CBC modes

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Demonstrates the older 56-bit DES encryption in ECB and CBC modes. Chilkat2-Python

import chilkat2

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

crypt = chilkat2.Crypt2()

# Specify DES for the encryption algorithm:
crypt.CryptAlgorithm = "des"

# CipherMode may be "ecb" or "cbc"
crypt.CipherMode = "cbc"

# Keylength is 64 bits (56 bits + 8 parity bits)
crypt.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.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.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)

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