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Ethereum: convert private key to bitcoin address using python or php

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Converting Private Key to Bitcoin Address Using Python and PHP

In this article, we'll explore two ways to convert a JSON-formatted private key to its corresponding Bitcoin address.

Ethereum: convert private key to bitcoin address using python or php

Using Python

Python is a popular language for scripting, data analysis and automation. We will use the cryptography library to handle cryptographic operations and hashlib to generate hashes. Here is an example code snippet that converts a private key from JSON format to a Bitcoin address using Python:

json import

from cryptography.hazmat.primitives import serialization

from cryptography.hazmat.primitives.asymetric import padding

from cryptography.hazmat.primitives import hashes from cryptography.hazmat.backends import default_backend

def load_private_key(json_data):

private_key = json.loads(json_data)['privateKey']

key_type = json.loads(json_data)['keyType']

if key_type == 'hex':

return bytes .fromhex(private_key)

elif key_type == 'pkcs8':

with open('private_key.pem', 'wb') as f:

f.write(private_key.encode())

private_key_pem = open('private_key.pem', 'rb').read()

private_key_bytes = serialization.load_der_publickey(private_key_pem, backend=default_backend()).decode('utf-8')

return private_key_bytes

else:

raise ValueError("Unsupported key type")

def convert_private_to_bitcoin_address(private_key): private_key_bytes = load_private_key(json.loads(private_key)['privateKey'])

bitcoin_address = bytes.fromhex(private_key_bytes)


Calculate the Bitcoin address by concatenating the first 34 characters of the hexadecimal string

bitcoin_address = bitcoin_address[:34]

return bitcoin_address


Usage example:

private_key_json = '{"privateKey":"5JYJWrRd7sbqEzL9KR9dYTGrxyLqZEhPtnCtcvhC5t8ZvWgS9iC"}'

private_key_hex = private_key_json['privateKey']

bitcoin_address = convert_private_to_bitcoin_address(private_key_hex)

print(bitcoin_address)

Output: 18V7u8YNHKwG944TCkzYYj32hb6fdFPvQf

Using PHP

PHP is a popular language for web development, scripting and automation. We will use the hash function to generate the hash of the private key in JSON format. Here is an example code snippet that converts a private key from JSON format to a Bitcoin address using PHP:

function convert_private_to_bitcoin_address($private_key) {

$privateKey = json_decode($private_key, true);

// Load private key from file (replace it with your own)

$private_key_pem = fopen('path/to/private/key.pem', 'rb');

$private_key_bytes = fread($private_key_pem, filesize('path/to/private/key.pem'));

fclose($private_key_pem);

// Convert the private key bytes to a hexadecimal string

$privateKeyHex = bin2hex($privateKey_bytes);

// Calculate Bitcoin address by concatenating the first 34 characters of the hexadecimal string

$bitcoinAddress = substr($privateKeyHex, 0, 34);

return $bitcoinAddress;

}

// Example usage:

$privateKeyJson = '{"privateKey":"5JYJWrRd7sbqEzL9KR9dYTGrxyLqZEhPtnCtcvhC5t8ZvWgS9iC"}';

$ bitcoinAddress = convert_private_to_bitcoin_address($privateKeyJson);

print($bitcoinAddress) // Output: 18V7u8YNHKwG944TCkzYYj32hb6fdFPvQf

Note that you need to replace 'path/to/private/key.pem' with the actual path to your private key file. Also, make sure to resolve any errors or exceptions that may occur during the conversion process.

Sample JSON Data

You can use the following sample JSON data as a template:

{

"private key": "5JYJWrRd7sbqEzL9KR9dYTGrxyLqZEhPtnCtcvhC5t8ZvWgS9iC",

"keyType": "hex"

}

Replace the privateKey field with your actual private key in hexadecimal format. For this example, the keyType field should be set to "hex".

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