Function format_serial_number

crates/stdlib/src/ssl/cert.rs:209–215

Format certificate serial number to hexadecimal string with even padding Converts a BigUint serial number to uppercase hex string, ensuring even length by prepending '0' if necessary.

(serial: &num_bigint::BigUint)

/// Converts a BigUint serial number to uppercase hex string, ensuring
/// even length by prepending '0' if necessary.
fn format_serial_number(serial: &num_bigint::BigUint) -> String {
    let mut serial_str = serial.to_str_radix(16).to_uppercase();
    if serial_str.len() % 2 == 1 {
        serial_str.insert(0, '0');
    }
    serial_str
}

/// Normalize wildcard hostname by stripping "*." prefix
///