(CkPython) PBES2 Password-Based Encryption (PBE)

Demonstrates how to implement password-based encryption according to the PKCS #5 v2.0: Password-Based Cryptography Standard (published by RSA Laboratories). This example uses PBES2, which ise based on the PBKDF2 function and an underlying block cipher such as RC2, DES, etc.

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import chilkat

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

crypt = chilkat.CkCrypt2()

# Set properties for PBES2 encryption:

crypt.put_CryptAlgorithm("pbes2")
crypt.put_PbesPassword("mySecretPassword")

# Set the underlying PBE algorithm (and key length):
crypt.put_PbesAlgorithm("rc2")
crypt.put_KeyLength(128)
# Only required for the RC2 algorithm:
crypt.put_Rc2EffectiveKeyLength(128)

# By definition, the block encryption algorithm (RC2 or whichever
# was selected) will run in CBC mode.  Therefore, we need
# an IV.  The IV is equal in length to the block size of the
# algorithm.  RC2 has a block size of 8 bytes (regardless of
# key length), so set the IV to some value that is 8 bytes 
# in length:
crypt.SetEncodedIV("0000000000000000","hex")

# Give it some salt:
crypt.SetEncodedSalt("0102030405060708","hex")

# A higher iteration count makes the algorithm more
# computationally expensive and therefore exhaustive
# searches (for breaking the encryption) is more difficult:
crypt.put_IterationCount(1024)

# A hash algorithm needs to be set for PBES2:
crypt.put_HashAlgorithm("sha1")

# Indicate that the encrypted bytes should be returned
# as a hex string:
crypt.put_EncodingMode("hex")

plainText = "To be encrypted."

encryptedText = crypt.encryptStringENC(plainText)

print(encryptedText)

# Now decrypt:
decryptedText = crypt.decryptStringENC(encryptedText)

print(decryptedText)