Python simplifies the conversion, handling arbitrarily long serial numbers without size limits.
echo "ibase=16; 1A2B3C4D" | bc
How to Convert a Certificate Serial Number from Hex to Decimal convert certificate serial number hex to decimal
Or using printf :
Serial Number: 04:5e:7f:3a:2b:99:00:1d:9e:44:2a:11:87:3c:fa:21 Calculate the Total : Use the formula: Digit
Many user interfaces (UIs), particularly those belonging to CAs or older Microsoft management consoles (MMC), prefer to display this integer in Decimal format because it aligns with standard numeric conventions humans use daily.
: Convert each hex character to its decimal value (0-9 remain the same; A=10, B=11, C=12, D=13, E=14, F=15). Calculate the Total : Use the formula: Digit Value 16) print(f"cert_file: decimal_serial") import os
for cert_file in os.listdir("."): if cert_file.endswith(".crt"): result = subprocess.run( ["openssl", "x509", "-in", cert_file, "-noout", "-serial"], capture_output=True, text=True ) hex_serial = result.stdout.split("=")[1].strip() decimal_serial = int(hex_serial, 16) print(f"cert_file: decimal_serial")
import os, subprocess