Chilkat2-Python

AES Encrypt String (utf-8 byte representation) and return Base64

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Demonstrates how to AES encrypt the utf-8 byte representation of a string and return in base64 format. Chilkat2-Python

import chilkat2

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

crypt = chilkat2.Crypt2()

crypt.CryptAlgorithm = "aes"
crypt.CipherMode = "cbc"
crypt.KeyLength = 256
crypt.Charset = "utf-8"
crypt.EncodingMode = "base64"

ivHex = "000102030405060708090A0B0C0D0E0F"
crypt.SetEncodedIV(ivHex,"hex")
keyHex = "000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F"
crypt.SetEncodedKey(keyHex,"hex")

encryptedStr = crypt.EncryptStringENC("This is the original string")
print(encryptedStr)

# Let's say we want to URL encode the base64 string..
crypt.CryptAlgorithm = "none"
crypt.EncodingMode = "url"
urlEncoded = crypt.EncryptStringENC(encryptedStr)
print(urlEncoded)

# Sample output:

#  q3fmgEqjqa9o//ZS6aPuh4Wtbrrxx/WOIQSKeVnesZg=
#  q3fmgEqjqa9o%2F%2FZS6aPuh4Wtbrrxx%2FWOIQSKeVnesZg%3D

# -------------------------------------------------------------------
# Now let's do the reverse...
# 

# We start with a string that is the binary encrypted data, base64 encoded, and then URL encoded.
encBase64Url = "q3fmgEqjqa9o%2F%2FZS6aPuh4Wtbrrxx%2FWOIQSKeVnesZg%3D"

# We'll use the same crypt object.  If using a new instance of the crypt object,
# make sure *all* settings are identical:  the algorithm, cipher mode, key length, charset, encoding mode, IV, and secret key.

# Decode from URL...
crypt.CryptAlgorithm = "none"
crypt.EncodingMode = "url"
encBase64 = crypt.DecryptStringENC(urlEncoded)
print(encBase64)

# Now decrypt...
crypt.CryptAlgorithm = "aes"
crypt.EncodingMode = "base64"
originalStr = crypt.DecryptStringENC(encBase64)
print(originalStr)