install libs:

pip3 install PyCryptodome
pip3 install flask
python version: Python3

Obs.: Some times pip3 fails to install. Then its possible to use easy_install: easy_install pycryptodome

How to start application:

Start first server:

python3 ./api.py 8001

This means server will start at HTTP port 8001

Start the other servers:

python3 ./api.py 8002 http://localhost:8001

This means server will start at HTTP port 8002 and will connect to the server at the same machine on the port 8001

Create wallets and blockchanig blocks

Import postman collections and variables at folder /postman and run the requests

Encryption example:

Generate private/public key

from Crypto.PublicKey import RSA

key = RSA.generate(2048)
private_key = key.export_key()
public_key = key.publickey().export_key()

Create signature

from Crypto.Signature import pkcs1_15
from Crypto.Hash import SHA384

digest = SHA384.new()
digest.update(b"data")

signer = pkcs1_15.new(RSA.import_key(private_key))
signature = signer.sign(digest)

Verify Signature

key = RSA.importKey(public_key)
pkcs1_15.new(key).verify(digest, signature)

Debug

import pdb;pdb.set_trace()
$ n //next line
$ ll //list context
$ c //continue

References

https://pycryptodome.readthedocs.io/en/latest/src/signature/pkcs1_v1_5.html https://gist.github.com/adamar/a4c573c724f647d7fdcfce5a0f1638d9 https://websockets.readthedocs.io/en/stable/intro.html https://medium.com/@gnsrikanth/implementing-asymmetric-encryption-to-secure-your-project-35368049cb5f

eduardoschneiders/blockchain