dsp-blockchain/create_keys.py

import os
import rsa

from cryptography.hazmat.backends import default_backend
#from cryptography.hazmat.primitives.asymmetric import rsa
from cryptography.hazmat.primitives import serialization
from cryptography.fernet import Fernet

def make_keys(contract_name):
    (public_key,private_key)=rsa.newkeys(2048)
    # private_key = rsa.generate_private_key(
    #     public_exponent=65537,
    #     key_size=2048,
    #     backend=default_backend()
    #     )
    # public_key = private_key.public_key()

    # pem = public_key.public_bytes(
    #     encoding=serialization.Encoding.PEM,
    #     format=serialization.PublicFormat.SubjectPublicKeyInfo
    # )

    path = 'contract_keys\\' + contract_name + '\\'

    os.mkdir(path)
    
    with open(path + 'publickey.key','wb') as f:
        f.write(public_key)

    # pem = private_key.private_bytes(
    #     encoding=serialization.Encoding.PEM,
    #     format=serialization.PrivateFormat.PKCS8,
    #     encryption_algorithm=serialization.NoEncryption()
    # )

    with open(path + 'privatekey.key','wb') as f:
        f.write(private_key)
    
    
    symmetric_key = Fernet.generate_key()

    with open(path + 'symmetric.key','wb') as f:
        f.write(symmetric_key)
    
def get_keys(contract_name):
    path = 'contract_keys\\' + contract_name  + '\\publickey.key'

    # with open(path, 'rb') as f:
    #     public_key = serialization.load_pem_public_key(
    #         f.read(),
    #         backend=default_backend()
    #         )
    #     return public_key

    with open(path, 'rb') as f:
        return rsa.PublicKey.load_pkcs1(f.read())

def get_symmetric_key(contract_name):
    path = 'contract_keys\\' + contract_name  + '\\symmetric.key'

    with open(path, 'rb') as f:
        return f.read()

def get_private_key(contract_name):
    path = 'contract_keys\\' + contract_name  + '\\privatekey.key'

    # with open(path, "rb") as key_file:
    #     private_key = serialization.load_pem_private_key(
    #         key_file.read(),
    #         password=None,
    #         backend=default_backend()
    #     )
    # return private_key
    with open(path, 'rb') as f:
        return rsa.PrivateKey.load_pkcs1(f.read())


def get_plain_key(contract_name):
    path = 'contract_keys\\' + contract_name  + '\\publickey.key'
    with open(path, 'rt') as f:
        return f.read().split('-----')[2].strip().replace('\n', '')