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//
// PBKDF2 derivation
//
use crate::error::Error;
use ring::{digest, hmac, pbkdf2};
use std::num::NonZeroU32;
static DIGEST_ALG: &digest::Algorithm = &digest::SHA256;
const OUTPUT_LEN: usize = digest::SHA256_OUTPUT_LEN;
pub fn hash_password(secret: &[u8], salt: &[u8], iterations: u32) -> Vec<u8> {
let mut out = vec![0u8; OUTPUT_LEN]; // Initialize array with zeros
let iterations = NonZeroU32::new(iterations).expect("Iterations can't be zero");
pbkdf2::derive(DIGEST_ALG, iterations, salt, secret, &mut out);
out
}
pub fn verify_password_hash(secret: &[u8], salt: &[u8], previous: &[u8], iterations: u32) -> bool {
let iterations = NonZeroU32::new(iterations).expect("Iterations can't be zero");
pbkdf2::verify(DIGEST_ALG, iterations, salt, secret, previous).is_ok()
}
//
// HMAC
//
pub fn hmac_sign(key: &str, data: &str) -> String {
use data_encoding::HEXLOWER;
let key = hmac::SigningKey::new(&digest::SHA1, key.as_bytes());
let signature = hmac::sign(&key, data.as_bytes());
HEXLOWER.encode(signature.as_ref())
}
//
// Random values
//
pub fn get_random_64() -> Vec<u8> {
get_random(vec![0u8; 64])
}
pub fn get_random(mut array: Vec<u8>) -> Vec<u8> {
use ring::rand::{SecureRandom, SystemRandom};
SystemRandom::new()
.fill(&mut array)
.expect("Error generating random values");
array
}
pub fn generate_token(token_size: u32) -> Result<String, Error> {
if token_size > 19 {
err!("Generating token failed")
}
// 8 bytes to create an u64 for up to 19 token digits
let bytes = get_random(vec![0; 8]);
let mut bytes_array = [0u8; 8];
bytes_array.copy_from_slice(&bytes);
let number = u64::from_be_bytes(bytes_array) % 10u64.pow(token_size);
let token = format!("{:0size$}", number, size = token_size as usize);
Ok(token)
}
//
// Constant time compare
//
pub fn ct_eq<T: AsRef<[u8]>, U: AsRef<[u8]>>(a: T, b: U) -> bool {
use ring::constant_time::verify_slices_are_equal;
verify_slices_are_equal(a.as_ref(), b.as_ref()).is_ok()
}
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