116 Zeilen
3.4 KiB
Rust
116 Zeilen
3.4 KiB
Rust
//
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// PBKDF2 derivation
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//
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use std::num::NonZeroU32;
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use data_encoding::{Encoding, HEXLOWER};
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use ring::{digest, hmac, pbkdf2};
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static DIGEST_ALG: pbkdf2::Algorithm = pbkdf2::PBKDF2_HMAC_SHA256;
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const OUTPUT_LEN: usize = digest::SHA256_OUTPUT_LEN;
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pub fn hash_password(secret: &[u8], salt: &[u8], iterations: u32) -> Vec<u8> {
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let mut out = vec![0u8; OUTPUT_LEN]; // Initialize array with zeros
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let iterations = NonZeroU32::new(iterations).expect("Iterations can't be zero");
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pbkdf2::derive(DIGEST_ALG, iterations, salt, secret, &mut out);
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out
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}
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pub fn verify_password_hash(secret: &[u8], salt: &[u8], previous: &[u8], iterations: u32) -> bool {
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let iterations = NonZeroU32::new(iterations).expect("Iterations can't be zero");
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pbkdf2::verify(DIGEST_ALG, iterations, salt, secret, previous).is_ok()
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}
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//
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// HMAC
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//
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pub fn hmac_sign(key: &str, data: &str) -> String {
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let key = hmac::Key::new(hmac::HMAC_SHA1_FOR_LEGACY_USE_ONLY, key.as_bytes());
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let signature = hmac::sign(&key, data.as_bytes());
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HEXLOWER.encode(signature.as_ref())
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}
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//
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// Random values
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//
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/// Return an array holding `N` random bytes.
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pub fn get_random_bytes<const N: usize>() -> [u8; N] {
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use ring::rand::{SecureRandom, SystemRandom};
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let mut array = [0; N];
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SystemRandom::new().fill(&mut array).expect("Error generating random values");
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array
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}
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/// Encode random bytes using the provided function.
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pub fn encode_random_bytes<const N: usize>(e: Encoding) -> String {
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e.encode(&get_random_bytes::<N>())
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}
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/// Generates a random string over a specified alphabet.
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pub fn get_random_string(alphabet: &[u8], num_chars: usize) -> String {
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// Ref: https://rust-lang-nursery.github.io/rust-cookbook/algorithms/randomness.html
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use rand::Rng;
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let mut rng = rand::thread_rng();
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(0..num_chars)
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.map(|_| {
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let i = rng.gen_range(0..alphabet.len());
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alphabet[i] as char
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})
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.collect()
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}
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/// Generates a random numeric string.
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pub fn get_random_string_numeric(num_chars: usize) -> String {
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const ALPHABET: &[u8] = b"0123456789";
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get_random_string(ALPHABET, num_chars)
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}
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/// Generates a random alphanumeric string.
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pub fn get_random_string_alphanum(num_chars: usize) -> String {
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const ALPHABET: &[u8] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZ\
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abcdefghijklmnopqrstuvwxyz\
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0123456789";
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get_random_string(ALPHABET, num_chars)
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}
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pub fn generate_id<const N: usize>() -> String {
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encode_random_bytes::<N>(HEXLOWER)
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}
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pub fn generate_send_id() -> String {
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// Send IDs are globally scoped, so make them longer to avoid collisions.
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generate_id::<32>() // 256 bits
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}
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pub fn generate_attachment_id() -> String {
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// Attachment IDs are scoped to a cipher, so they can be smaller.
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generate_id::<10>() // 80 bits
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}
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/// Generates a numeric token for email-based verifications.
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pub fn generate_email_token(token_size: u8) -> String {
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get_random_string_numeric(token_size as usize)
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}
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/// Generates a personal API key.
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/// Upstream uses 30 chars, which is ~178 bits of entropy.
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pub fn generate_api_key() -> String {
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get_random_string_alphanum(30)
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}
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//
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// Constant time compare
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//
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pub fn ct_eq<T: AsRef<[u8]>, U: AsRef<[u8]>>(a: T, b: U) -> bool {
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use ring::constant_time::verify_slices_are_equal;
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verify_slices_are_equal(a.as_ref(), b.as_ref()).is_ok()
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}
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