Python Rsa Key Generation Example

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Python Rsa Key Generator
Rsa Key Generation Algorithm
Python Rsa Key Generation

Oct 24, 2019 An example of asymmetric encryption in python using a public/private keypair - utilizes RSA from PyCrypto library - RSAexample.py An example of asymmetric encryption in python using a public/private keypair - utilizes RSA from PyCrypto library - RSAexample.py. The following are code examples for showing how to use Crypto.PublicKey.RSA.importKey.They are from open source Python projects. You can vote up the examples you like or vote down the ones you don't like.

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Demonstrates how to use RSA to protect a key for AES encryption. It can be used in this scenario: You will provide your RSA public key to any number of counterparts. Your counterpart will generate an AES key, encrypt data (or a file) using it, then encrypt the AES key using your RSA public key. Ssh generate dsa key pair number. Your counterpart sends you both the encrypted data and the encrypted key. Since you are the only one with access to the RSA private key, only you can decrypt the AES key. You decrypt the key, then decrypt the data using the AES key.

This example will show the entire process. (1) Generate an RSA key and save both private and public parts to PEM files. (2) Encrypt a file using a randomly generated AES encryption key. (3) RSA encrypt the AES key. (4) RSA decrypt the AES key. (5) Use it to AES decrypt the file or data.

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An example of asymmetric encryption in python using a public/private keypair - utilizes RSA from PyCrypto library

RSA_example.py

Python Rsa Key Generator

# Inspired from http://coding4streetcred.com/blog/post/Asymmetric-Encryption-Revisited-(in-PyCrypto)

# PyCrypto docs available at https://www.dlitz.net/software/pycrypto/api/2.6/

fromCryptoimportRandom

fromCrypto.PublicKeyimportRSA

importbase64

defgenerate_keys():

# RSA modulus length must be a multiple of 256 and >= 1024

modulus_length=256*4# use larger value in production

privatekey=RSA.generate(modulus_length, Random.new().read)

publickey=privatekey.publickey()

returnprivatekey, publickey

defencrypt_message(a_message , publickey):

encrypted_msg=publickey.encrypt(a_message, 32)[0]

encoded_encrypted_msg=base64.b64encode(encrypted_msg) # base64 encoded strings are database friendly

returnencoded_encrypted_msg

defdecrypt_message(encoded_encrypted_msg, privatekey):

decoded_encrypted_msg=base64.b64decode(encoded_encrypted_msg)

decoded_decrypted_msg=privatekey.decrypt(decoded_encrypted_msg)

returndecoded_decrypted_msg

########## BEGIN ##########

a_message='The quick brown fox jumped over the lazy dog'

privatekey , publickey=generate_keys()

encrypted_msg=encrypt_message(a_message , publickey)

decrypted_msg=decrypt_message(encrypted_msg, privatekey)

print'%s - (%d)'% (privatekey.exportKey() , len(privatekey.exportKey()))

print'%s - (%d)'% (publickey.exportKey() , len(publickey.exportKey()))

print' Original content: %s - (%d)'% (a_message, len(a_message))

print'Encrypted message: %s - (%d)'% (encrypted_msg, len(encrypted_msg))

print'Decrypted message: %s - (%d)'% (decrypted_msg, len(decrypted_msg))

commented Aug 11, 2018

I ran this code but got an error. It is python 3.7 running the latest PyCryptodome
Would you mind helping? I am a little lost..

File 'C:(the file location and name but i'm not going to list it).py', line 29
print '%s - (%d)' % (privatekey.exportKey() , len(privatekey.exportKey()))
^
SyntaxError: invalid syntax

commented Aug 15, 2018

@maxharrison These print statements indicate it was written for python 2. It could be easily fixable by making use of the print function instead of the print statement., however, no guarantees.

commented Aug 31, 2018

I am trying to learn this stuff. When I run this, I get the following error.
return (self.key._encrypt(c),) TypeError: argument 1 must be int, not str
I googled and found a bit on b64encode to be imported or encrypt(hash_pass, 32)[0] to include .encode('hex') but to no avail. Can you help?

commented Sep 18, 2018•
edited

Hi @anoopsaxena76,

Just change the encryption line as this:
encrypted_msg = encrypt_message(a_message.encode('utf-8'), publickey)

I just did it myself, it works like a charm

commented Aug 28, 2019

I ran this code but got an error. It is python 3.7 running the latest PyCryptodome

Hey, I'm trying to run this code on Python 3.7 too. What did you change apart from that print statement to adapt the code to Pycrytodome?
I get the error:

File 'C:/Users/..(don't want to show this bit)/Gavcoin3.py', line 15, in
from crypto.Hash import SHA
File 'C:Users(don't want to show this bit)AppDataLocalProgramsPythonPython37libsite-packagescryptoHashSHA.py', line 24, in
from Crypto.Hash.SHA1 import doc, new, block_size, digest_size
ModuleNotFoundError: No module named 'Crypto'

Please help!

commented Sep 13, 2019

Hi @GavinAren,

I hope you've already solved your issue but if not:
Look in your python directory for /Lib/site-packages/crypto and change it to Crypto. (Capital C)

Rsa Key Generation Algorithm

commented Oct 2, 2019

I ran this code but got an error. It is python 3.7 running the latest PyCryptodome
Hey, I'm trying to run this code on Python 3.7 too. What did you change apart from that print statement to adapt the code to Pycrytodome?
I get the error:
File 'C:/Users/..(don't want to show this bit)/Gavcoin3.py', line 15, in
from crypto.Hash import SHA
File 'C:Users(don't want to show this bit)AppDataLocalProgramsPythonPython37libsite-packagescryptoHashSHA.py', line 24, in
from Crypto.Hash.SHA1 import doc, new, block_size, digest_size
ModuleNotFoundError: No module named 'Crypto'
Please help!

PyCrypto is written and tested using Python version 2.1 through 3.3. Python
1.5.2 is not supported. My POC resolves that pycrypto is obsoleted in python3.7. Pycryptodome is working alternative of it, but unfortunately it doesn't support plain RSA cryptography.