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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.
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 stringbitcoin_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"
.