karpathyclone_cryptos

My shameless copy of a karpathy/cryptos by hand

cryptos

Just having fun

SHA-256

SHA-256 implementation following NIST FIPS 180-4 spec in 'cryptos/sha256.py'. Pure Python, slow, trying to closely follow the docement spec, obviously not to be used anywhere except for educational purposes.

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

KEYS

This repo hasa pure Python from-scratch zero-dependency implemtation for generating a new private/public key pair and the corresponding Bitcoin address (okay, except the RIPEMD160 hash function implementation that I imported). use the cli:

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

You can also generate you own entropy from keyboard timings if you call the cli as '$python getnewaddress.py user', or you can verify that the implementation is not borken by reproducing the Mastering Bitcoin Chapter4 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 :)

License

MIT