(CkPython) openssl enc decrypt

Demonstrates how to decrypt a file that was encrypted using "openssl enc".

This example shows how to decrypt what was created using this openssl command:

openssl enc -e -aes-256-cbc -in hamlet.xml -out hamlet.enc -pass file:./secret.txt

This example shows how to do this:

openssl enc -d -aes-256-cbc -in hamlet.enc -out hamlet_dec.xml -pass file:./secret.txt

Note: This example requires Chilkat v9.5.0.71 or later.

Chilkat Python Downloads install with pip pip3 install chilkat or download... Python Module for Windows, MacOS, Linux, Alpine Linux, Solaris

import chilkat

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

crypt = chilkat.CkCrypt2()

# Use aes-256-cbc
crypt.put_CryptAlgorithm("aes")
crypt.put_CipherMode("cbc")
crypt.put_KeyLength(256)

# We'll need to set the hash algorithm to either MD5 or SHA256.
# openssl version 1.0.* or earlier used MD5 by default
# openssl version 1.1.* uses SHA-256 for the password to secret key derivation.

# For example, if openssl 1.1.0 was used, we should do this:
crypt.put_HashAlgorithm("sha256")

# This example assumes openssl 1.0.2 was used to encrypt what we're now decrypting:
crypt.put_HashAlgorithm("md5")

# The openssl command we are duplicating is:
# 
#    openssl enc -d -aes-256-cbc -in hamlet.enc -out hamlet_dec.xml -pass file:./secret.txt
# 
# The file secret.txt contains the word "secret".  We could write code to load the contents
# of secret.txt, but instead we'll just do this:
crypt.SetSecretKeyViaPassword("secret")

# Load the file to be decrypted.
fileData = chilkat.CkBinData()
success = fileData.LoadFile("qa_data/openssl_enc/hamlet.enc")

# Decrypt
success = crypt.DecryptBd(fileData)

# Save the decrypted output.
success = fileData.WriteFile("qa_output/hamlet_dec.xml")

print("success = " + str(success))