Rsa Public Key Generation Using Python

Rsa Public Key Generation Using Python 3,8/5 8470 reviews

Python PyCrypto: Generate RSA Keys Example.py

Rsa Key Generation Windows

defgenerate_RSA(bits=2048):

Generate an RSA keypair with an exponent of 65537 in PEM format

param: bits The key length in bits

Return private key and public key

fromCrypto.PublicKeyimportRSA

new_key=RSA.generate(bits, e=65537)

public_key=new_key.publickey().exportKey('PEM')

private_key=new_key.exportKey('PEM')

returnprivate_key, public_key

Oct 15, 2016 If you’re using Python 3 it’s much easier to use the cryptography library. Here’s an example which generates an RSA key pair, prints the private key as a string in PEM container format, and prints the public key as a string in OpenSSH format. Aug 10, 2018 This tutorial explains how to encrypt and decrypt text using private and public key encryption, also known as asymmetric encryption. RSA Key Generation. Let's demonstrate in practice the RSA sign / verify algorithm. We shall use the pycryptodome package in Python to generate RSA keys.After the keys are generated, we shall compute RSA digital signatures and verify signatures by a simple modular exponentiation (by encrypting and decrypting the message hash).

commented Aug 5, 2016•
edited

Pycrypto is unmaintained and has known vulnerabilities. Use pycryptodome, it is a drop-in replacement.

commented Aug 16, 2016•
edited

commented Jan 17, 2017

e should be random methinks =P

commented May 17, 2017•
edited

@miigotu 'youthinks' wrong. e should be chosen so that e and λ(n) are coprime. It is not chosen at random, and since it is usually small for computation reasons, and included in the public key, it can always be known by an attacker anyway.

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commented Aug 17, 2017

from Crypto.PublicKey import RSA
code = 'nooneknows'

key = RSA.generate(2048)
privatekey = key.exportKey(passphrase=code, pkcs=8)
publickey = key.publickey().exportKey()

commented Jan 15, 2018

Nice But How Can I Write The Private Key I Tried This:
f = open('PublicKey.pem','w')
f.write(publick_key)
f.close()

BUT IT DOESN'T WORK WITH THE PRIVATE KEY, JUST RETURNS 0B

commented Jan 30, 2018

@WarAtLord try publick_key.exportKey('PEM')

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

RSA_example.py

# 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?

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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)

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.

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commented Aug 5, 2016• edited

commented Aug 16, 2016• edited