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ch04: Fix 'key-to-address-ecc-example'

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The 'pybitcointools' library is deprecated. Vitalik mentions using the
fork from 'primal100'. This updates the code sample which is currently
broken, to use the Python package for that fork.

Runs all good now.
This commit is contained in:
Will Binns 2021-03-08 15:59:01 +01:00
parent de68a97638
commit 39d663ed30
No known key found for this signature in database
GPG Key ID: 302EBEAEEB74A404
1 changed files with 12 additions and 12 deletions
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24
code/key-to-address-ecc-example.py
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@ -1,18 +1,18 @@
from __future__ import print_function
import bitcoin
import cryptos
# Generate a random private key
valid_private_key = False
while not valid_private_key:
private_key = bitcoin.random_key()
decoded_private_key = bitcoin.decode_privkey(private_key, 'hex')
valid_private_key = 0 < decoded_private_key < bitcoin.N
private_key = cryptos.random_key()
decoded_private_key = cryptos.decode_privkey(private_key, 'hex')
valid_private_key = 0 < decoded_private_key < cryptos.N
print("Private Key (hex) is: ", private_key)
print("Private Key (decimal) is: ", decoded_private_key)
# Convert private key to WIF format
wif_encoded_private_key = bitcoin.encode_privkey(decoded_private_key, 'wif')
wif_encoded_private_key = cryptos.encode_privkey(decoded_private_key, 'wif')
print("Private Key (WIF) is: ", wif_encoded_private_key)
# Add suffix "01" to indicate a compressed private key
@ -20,27 +20,27 @@ compressed_private_key = private_key + '01'
print("Private Key Compressed (hex) is: ", compressed_private_key)
# Generate a WIF format from the compressed private key (WIF-compressed)
wif_compressed_private_key = bitcoin.encode_privkey(
bitcoin.decode_privkey(compressed_private_key, 'hex'), 'wif')
wif_compressed_private_key = cryptos.encode_privkey(
cryptos.decode_privkey(compressed_private_key, 'hex'), 'wif')
print("Private Key (WIF-Compressed) is: ", wif_compressed_private_key)
# Multiply the EC generator point G with the private key to get a public key point
public_key = bitcoin.fast_multiply(bitcoin.G, decoded_private_key)
public_key = cryptos.fast_multiply(cryptos.G, decoded_private_key)
print("Public Key (x,y) coordinates is:", public_key)
# Encode as hex, prefix 04
hex_encoded_public_key = bitcoin.encode_pubkey(public_key, 'hex')
hex_encoded_public_key = cryptos.encode_pubkey(public_key, 'hex')
print("Public Key (hex) is:", hex_encoded_public_key)
# Compress public key, adjust prefix depending on whether y is even or odd
(public_key_x, public_key_y) = public_key
compressed_prefix = '02' if (public_key_y % 2) == 0 else '03'
hex_compressed_public_key = compressed_prefix + (bitcoin.encode(public_key_x, 16).zfill(64))
hex_compressed_public_key = compressed_prefix + (cryptos.encode(public_key_x, 16).zfill(64))
print("Compressed Public Key (hex) is:", hex_compressed_public_key)
# Generate bitcoin address from public key
print("Bitcoin Address (b58check) is:", bitcoin.pubkey_to_address(public_key))
print("Bitcoin Address (b58check) is:", cryptos.pubkey_to_address(public_key))
# Generate compressed bitcoin address from compressed public key
print("Compressed Bitcoin Address (b58check) is:",
bitcoin.pubkey_to_address(hex_compressed_public_key))
cryptos.pubkey_to_address(hex_compressed_public_key))