Extract modulus n as a decimal integer from SSH public key

import paramiko
import base64
import struct

def ssh_key_to_pem(key_file):
    with open(key_file, 'r') as f:
        key_contents = f.read().strip()
    key_type, key_string, _ = key_contents.split()
    data = base64.b64decode(key_string)
    
    # Unpack the data from bytes
    int_len = 4
    str_len = struct.unpack('>I', data[:int_len])[0]  # length of string
    
    # Find starting index of modulus, skip "ssh-rsa" part
    start_index = int_len + str_len + int_len + int_len
    modulus_length = struct.unpack('>I', data[start_index:start_index+int_len])[0]
    
    # Extract modulus
    modulus = data[start_index+int_len:start_index+int_len+modulus_length]
    return int.from_bytes(modulus, byteorder='big')

# Replace 'bruce_rsa.pub' with your actual public key file path
modulus = ssh_key_to_pem('bruce_rsa.pub')
print(modulus)

# Make sure you have paramiko installed in your Python environment (pip install paramiko). This script should correctly parse the SSH public key and print out the modulus ( n ) as a decimal integer.