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(Python) RC2 Encryption and Decryption

RC2 encryption. The Chilkat encryption component supports RC2 encryption in both ECB (Electronic Cookbook) and CBC (Cipher-Block Chaining) modes. The key size may range from 8 bits to 1024 bits.

Chilkat Python Downloads

Python Module for Windows, Linux, Alpine Linux,
MAC OS X, Solaris, FreeBSD, OpenBSD,
Raspberry Pi and other single board computers

import sys
import chilkat

crypt = chilkat.CkCrypt2()

success = crypt.UnlockComponent("Anything for 30-day trial")
if (success != True):
    print(crypt.lastErrorText())
    sys.exit()

#  Set the encryption algorithm = "rc2"
crypt.put_CryptAlgorithm("rc2")

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

#  KeyLength may range from 8 bits to 1024 bits
crypt.put_KeyLength(128)

#  RC2 also has an effective key length property
#  which can also range from 8 bits to 1024 bits:
crypt.put_Rc2EffectiveKeyLength(128)

#  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.  RC2 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 mode.
#  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 128-bit encryption, the binary secret key is 16 bytes.
keyHex = "000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F"
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)

 

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