(Chilkat2-Python) PBES1 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 PBES1, which ise based on the PBKDF1 function and an underlying block cipher such as RC2, DES, etc.

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import chilkat2

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

crypt = chilkat2.Crypt2()

# Set properties for PBES1 encryption:

crypt.CryptAlgorithm = "pbes1"
crypt.PbesPassword = "mySecretPassword"

# Set the underlying PBE algorithm (and key length):
# For PBES1, the underlying algorithm must be either
# 56-bit DES or 64-bit RC2 
# (this is according to the PKCS#5 specifications at
# http://www.rsa.com/rsalabs/node.asp?id=2127   )
crypt.PbesAlgorithm = "rc2"
crypt.KeyLength = 64

# The salt for PBKDF1 is always 8 bytes:
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.IterationCount = 1024

# A hash algorithm needs to be set for PBES1:
crypt.HashAlgorithm = "sha1"

# Indicate that the encrypted bytes should be returned
# as a hex string:
crypt.EncodingMode = "hex"

plainText = "To be encrypted."

encryptedText = crypt.EncryptStringENC(plainText)

print(encryptedText)

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

print(decryptedText)