Python Blowfish CBC Encryption Matching Published Test Vectors

Python script for Blowfish CBC encryption.

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# file: blowfishCBC.py

import chilkat 

# Python Blowfish CBC Encryption to match published test vector
# at http://www.schneier.com/code/vectors.txt
# Reproduced here:
# chaining mode test data
# key[16]  (0123456789ABCDEFF0E1D2C3B4A59687
# IV [8](FEDCBA9876543210
# data[29] ("7654321 Now is the time for " (includes trailing '\0')
# vdata[29] (37363534333231204E6F77206973207468652074696D6520666F722000
# cipher[32]= 6B77B4D63006DEE605B156E27403979358DEB9E7154616D959F1652BD5FF92CC
    
crypt = chilkat.CkCrypt2()
crypt.UnlockComponent("anything for 30-day trial")
    
# Set the CryptAlgorithm to "blowfish2".  Chilkat's original implementation
# of Blowfish ("blowfish") did not include CBC and returned encrypted data
# 4321 byte-swapped.  For backward compatibility, an additional CryptAlgorithm
# keyword ("blowfish2") was added to indicate the new Blowfish implementation.
crypt.put_CryptAlgorithm("blowfish2")
    
crypt.put_CipherMode("cbc")
crypt.put_KeyLength(128)
    
# Padding Schemes:
# 0((RFC2630) Each padding byte is the pad count (16 extra added if size is already a multiple of 16)
# 1(Random bytes except the last is the pad count (16 extra added if size is already multiple of 16)
# 2(Pad with random data. (If already a multiple of 16, no padding is added).
# 3(Pad with NULLs. (If already a multiple of 16, no padding is added).
# 4(Pad with SPACE chars(0x20). (If already a multiple of 16, no padding is added).
    
# To match the test vector output, we need to pad with NULL bytes.
crypt.put_PaddingScheme(3)
    
# Set the IV property via an encoded string.
crypt.SetEncodedIV("FEDCBA9876543210", "hex")
    
# Set the SecretKey property via an encoded string.
crypt.SetEncodedKey("0123456789ABCDEFF0E1D2C3B4A59687", "hex")
    
# Get the unencrypted data.
unencryptedData = chilkat.CkByteData()
crypt.Decode("37363534333231204E6F77206973207468652074696D6520666F722000", "hex",unencryptedData)
    
# Now encrypted it using the settings required to match the Blowfish test vector results.
crypt.put_EncodingMode("hex")
encryptedHexString = chilkat.CkString()
crypt.EncryptBytesENC(unencryptedData,encryptedHexString)
    
# Displays: 6B77B4D63006DEE605B156E27403979358DEB9E7154616D959F1652BD5FF92CC
print encryptedHexString.getString()