(CkPython) Encrypt with Chilkat, Decrypt with OpenSSL

Demonstrates how to RSA encrypt a string using Chilkat, and then shows the corresponding OpenSSL command to RSA decrypt. The OpenSSL command to decrypt is as follows:

openssl rsautl -decrypt -inkey VP_Private.pem -in rsa_encrypted.bin -out original.txt

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

import sys
import chilkat

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

rsa = chilkat.CkRsa()

# Note: RSA encryption uses the public key.  
# RSA decryption uses the private key.
# The reason is that the public key can be freely provided to anybody.  This allows anybody
# to send an encrypted message to the private key owner, and only the private key owner 
# can decrypt.
key = chilkat.CkPublicKey()

# Load an RSA public key from a PEM file:
success = key.LoadFromFile("qa_data/pem/VP_Public.pem")
if (success != True):
    print(key.lastErrorText())
    sys.exit()

# Load the public key into the RSA object.
success = rsa.ImportPublicKeyObj(key)
if (success != True):
    print(rsa.lastErrorText())
    sys.exit()

strToEncrypt = "00000000;XYZ2-3BHQ-ABCD-MMVV;6MY1-GHJK-9LRR;0"

# The LittleEndian property is False by default, but it is set here
# anyway to show that LittleEndian byte ordering is required for OpenSSL compatibility.
rsa.put_LittleEndian(False)

usePrivateKey = False
encryptedBytes = chilkat.CkByteData()
success = rsa.EncryptString(strToEncrypt,usePrivateKey,encryptedBytes)
if (rsa.get_LastMethodSuccess() != True):
    print(rsa.lastErrorText())
    sys.exit()

# The OpenSSL command to decrypt would be this:
# openssl rsautl -decrypt -inkey VP_Private.pem -in rsa_encrypted.bin -out original.txt

fac = chilkat.CkFileAccess()
success = fac.WriteEntireFile("qa_output/rsa_encrypted.bin",encryptedBytes)
if (success != True):
    print(fac.lastErrorText())
    sys.exit()

print("RSA Encryption Succeeded.")