84 lines
2.2 KiB
Rust
84 lines
2.2 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 ring::{digest, hmac, pbkdf2};
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use crate::error::Error;
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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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use data_encoding::HEXLOWER;
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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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pub fn get_random_64() -> Vec<u8> {
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get_random(vec![0u8; 64])
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}
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pub fn get_random(mut array: Vec<u8>) -> Vec<u8> {
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use ring::rand::{SecureRandom, SystemRandom};
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SystemRandom::new()
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.fill(&mut array)
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.expect("Error generating random values");
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array
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}
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pub fn generate_token(token_size: u32) -> Result<String, Error> {
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// A u64 can represent all whole numbers up to 19 digits long.
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if token_size > 19 {
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err!("Token size is limited to 19 digits")
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}
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let low: u64 = 0;
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let high: u64 = 10u64.pow(token_size);
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// Generate a random number in the range [low, high), then format it as a
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// token of fixed width, left-padding with 0 as needed.
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use rand::{thread_rng, Rng};
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let mut rng = thread_rng();
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let number: u64 = rng.gen_range(low, high);
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let token = format!("{:0size$}", number, size = token_size as usize);
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Ok(token)
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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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