Add asymmetric encryption in python

asymmetric_cryptography/README.md

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+## Asymmetric Encryption in python
+
+An example of asymmetric encryption in python using a public/private keypair - utilizes RSA from PyCrypto library 
+
+```bash
+pip install pycrypto
+python asymmetric.py
+```

asymmetric_cryptography/asymmetric.py

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+from Crypto import Random
+from Crypto.PublicKey import RSA
+import base64
+
+
+def generate_keys(modulus_length=256*4):
+    privatekey = RSA.generate(modulus_length, Random.new().read)
+    publickey = privatekey.publickey()
+    return privatekey, publickey
+
+
+def encryptit(message , publickey):
+    encrypted_msg = publickey.encrypt(message, 32)[0]
+    encoded_encrypted_msg = base64.b64encode(encrypted_msg)
+    return encoded_encrypted_msg
+
+
+def decryptit(message, privatekey):
+    decoded_encrypted_msg = base64.b64decode(message)
+    decoded_decrypted_msg = privatekey.decrypt(decoded_encrypted_msg)
+    return decoded_decrypted_msg
+
+
+if __name__ == '__main__':
+    message = "This is a awesome message!"
+    privatekey , publickey = generate_keys()
+    encrypted_msg = encryptit(message.encode("utf-8"), publickey)
+    decrypted_msg = decryptit(encrypted_msg, privatekey)
+
+    print(f'{privatekey.exportKey()} - ({len(privatekey.exportKey())})')
+    print(f'{publickey.exportKey()} - ({len(publickey.exportKey())})')
+    print(f'Original: {message} - ({len(message)})')
+    print(f'Encrypted: {encrypted_msg} - ({len(encrypted_msg)})')
+    print(f'Decrypted: {decrypted_msg} - ({len(decrypted_msg)})')