crypto utilities as a way of learning

Related tags

Finance cryptos
Overview

cryptos

Just me developing a pure Python from-scratch zero-dependency implementation of Bitcoin for educational purposes. This includes a lot of the core crypto math primitives such as SHA-256 and elliptic curves over finite fields math (but with the exception of RIPEMD160 hash function, which I imported).

SHA-256

My pure Python SHA-256 implementation closely following the NIST FIPS 180-4 spec, in cryptos/sha256.py. Since this is a from scratch pure Python implementation it is slow and obviously not to be used anywhere except for educational purposes. Example usage:

$ echo "some test file lol" > testfile.txt
$ shasum -a 256 testfile.txt
4a79aed64097a0cd9e87f1e88e9ad771ddb5c5d762b3c3bbf02adf3112d5d375
$ python -m cryptos.sha256 testfile.txt
4a79aed64097a0cd9e87f1e88e9ad771ddb5c5d762b3c3bbf02adf3112d5d375

Keys

getnewaddress.py is a cli entryway to the code that generates a new Bitcoin private/public key pair and the corresponding (base58 compressed) address:

$ python getnewaddress.py
generated private key:
0xc322622e6a0033bb93ff666753f77cc8b819d274d9edea007b7e4b2af4caf025
corresponding public key:
x: 5B9D87FE091D52EA4CD49EA5CEFDD8C099DF7E6CCF510A9A94C763DE38C575D5
y: 6049637B3683076C5568EC723CF7D38FD603B88447180829BBB508C554EEA413
compressed bitcoin address (b58check format):
1DBGfUXnwTS2PRu8h3JefU9uYwYnyaTd2z

You can also generate your own entropy from keyboard timings if you call the cli as $ python getnewaddress.py user, or you can verify that the implementation is not broken by reproducing the Mastering Bitcoin Chapter 4 example:

$ python getnewaddress.py mastering
generated private key:
0x3aba4162c7251c891207b747840551a71939b0de081f85c4e44cf7c13e41daa6
corresponding public key:
x: 5C0DE3B9C8AB18DD04E3511243EC2952002DBFADC864B9628910169D9B9B00EC
y: 243BCEFDD4347074D44BD7356D6A53C495737DD96295E2A9374BF5F02EBFC176
compressed bitcoin address (b58check format):
14cxpo3MBCYYWCgF74SWTdcmxipnGUsPw3

Where we see that after the all crazy hashing and elliptic curve over finite fields gymnastics the bitcoin address 14cxpo3MBCYYWCgF74SWTdcmxipnGUsPw3 matches, phew :)

Digital Signatures

Elliptic Curve Digital Signature Algorithm (ECDSA) implemented in cryptos/ecdsa.py, example usage:

>>> from cryptos.ecdsa import sign, verify
>>> from cryptos.keys import gen_key_pair
>>> sk1, pk1 = gen_key_pair()
>>> sk2, pk2 = gen_key_pair()
>>> message = ('pk1 wants to pay pk2 1 BTC').encode('ascii')
>>> sig = sign(sk1, message)
>>> verify(pk1, message, sig)
True
>>> verify(pk2, message, sig)
False

Unit tests

$ pytest

License

MIT

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Comments
  • added listen function for simple node

    added listen function for simple node

    There could also be times where the node is contacted from the outside world. Although I'm not sure if binding the socket to a public ip would be suitable for this repo, so I went for the local ip address.

    Also added SimpleNode.connect command so its optional whether to either listen or connect to an address, however connecting will only require the host address because of self.port already configured in the SimpleNode __init__() arguments.

    opened by JushBJJ 0
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I like to train Deep Neural Nets on large datasets.
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