main
use base64::Engine;
use base64::engine::general_purpose::URL_SAFE_NO_PAD;
use rand::RngCore;
use rand::rngs::OsRng;
use sha2::{Digest, Sha256};
pub fn random_b64url(len: usize) -> String {
let mut bytes = vec![0u8; len];
OsRng.fill_bytes(&mut bytes);
URL_SAFE_NO_PAD.encode(bytes)
}
pub fn sha256_hex(bytes: &[u8]) -> String {
let digest = Sha256::digest(bytes);
let mut out = String::with_capacity(digest.len() * 2);
for byte in digest {
use std::fmt::Write;
let _ = write!(out, "{byte:02x}");
}
out
}