Chilkat2-Python

Convert RSA Private Key to Public Key

See more RSA Examples

Demonstrates how to get a public RSA key from a private RSA key. Chilkat2-Python

import sys
import chilkat2

success = False

privKey = chilkat2.PrivateKey()

# Step 1: Load the private key from a source.
# (Chilkat can load private keys from all types of formats, and from in-memory bytes or encoded strings.
# see the online reference documentation for more options.)
success = privKey.LoadPemFile("qa_data/pem/VP_Private.pem")
if (success == False):
    print(privKey.LastErrorText)
    sys.exit()

# Step 2: Get the public key object from the private key object.
pubKey = chilkat2.PublicKey()
privKey.ToPublicKey(pubKey)

# Step 3: Save the public key in a desired format. 
# (Chilkat can load or save public and private keys in many different formats.  See
# the online reference documentation for more options.)

# Saves to a PKCS8 PEM file.
bPreferPkcs1 = False
success = pubKey.SavePemFile(bPreferPkcs1,"qa_data/pem/VP_Public.pem")
if (pubKey.LastMethodSuccess == False):
    print(pubKey.LastErrorText)
    sys.exit()

print("Extracted and saved public key from private key.")