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use getrandom::{getrandom, Error as RngError};
use sha1::{Sha1 as Sha1_hash, Digest};
use sha2::Sha256 as Sha256_hash;
use hmac::{Hmac, Mac, NewMac, crypto_mac::InvalidKeyLength};
use pbkdf2::pbkdf2;
use crate::common::Password;
use crate::secret;
use base64;
pub fn generate_nonce() -> Result<String, RngError> {
let mut data = [0u8; 32];
getrandom(&mut data)?;
Ok(base64::encode(&data))
}
#[derive(Debug, PartialEq)]
pub enum DeriveError {
IncompatibleHashingMethod(String, String),
IncorrectSalt,
IncompatibleIterationCount(u32, u32),
}
impl std::fmt::Display for DeriveError {
fn fmt(&self, fmt: &mut std::fmt::Formatter) -> std::fmt::Result {
match self {
DeriveError::IncompatibleHashingMethod(one, two) => write!(fmt, "incompatible hashing method, {} is not {}", one, two),
DeriveError::IncorrectSalt => write!(fmt, "incorrect salt"),
DeriveError::IncompatibleIterationCount(one, two) => write!(fmt, "incompatible iteration count, {} is not {}", one, two),
}
}
}
impl std::error::Error for DeriveError {}
pub trait ScramProvider {
type Secret: secret::Secret;
fn name() -> &'static str;
fn hash(data: &[u8]) -> Vec<u8>;
fn hmac(data: &[u8], key: &[u8]) -> Result<Vec<u8>, InvalidKeyLength>;
fn derive(data: &Password, salt: &[u8], iterations: u32) -> Result<Vec<u8>, DeriveError>;
}
pub struct Sha1;
impl ScramProvider for Sha1 {
type Secret = secret::Pbkdf2Sha1;
fn name() -> &'static str { "SHA-1" }
fn hash(data: &[u8]) -> Vec<u8> {
let hash = Sha1_hash::digest(data);
let mut vec = Vec::with_capacity(Sha1_hash::output_size());
vec.extend_from_slice(hash.as_slice());
vec
}
fn hmac(data: &[u8], key: &[u8]) -> Result<Vec<u8>, InvalidKeyLength> {
type HmacSha1 = Hmac<Sha1_hash>;
let mut mac = HmacSha1::new_varkey(key)?;
mac.update(data);
let result = mac.finalize();
let mut vec = Vec::with_capacity(Sha1_hash::output_size());
vec.extend_from_slice(result.into_bytes().as_slice());
Ok(vec)
}
fn derive(password: &Password, salt: &[u8], iterations: u32) -> Result<Vec<u8>, DeriveError> {
match *password {
Password::Plain(ref plain) => {
let mut result = vec![0; 20];
pbkdf2::<Hmac<Sha1_hash>>(plain.as_bytes(), salt, iterations, &mut result);
Ok(result)
},
Password::Pbkdf2 { ref method, salt: ref my_salt, iterations: my_iterations, ref data } => {
if method != Self::name() {
Err(DeriveError::IncompatibleHashingMethod(method.to_string(), Self::name().to_string()))
}
else if my_salt == &salt {
Err(DeriveError::IncorrectSalt)
}
else if my_iterations == iterations {
Err(DeriveError::IncompatibleIterationCount(my_iterations, iterations))
}
else {
Ok(data.to_vec())
}
},
}
}
}
pub struct Sha256;
impl ScramProvider for Sha256 {
type Secret = secret::Pbkdf2Sha256;
fn name() -> &'static str { "SHA-256" }
fn hash(data: &[u8]) -> Vec<u8> {
let hash = Sha256_hash::digest(data);
let mut vec = Vec::with_capacity(Sha256_hash::output_size());
vec.extend_from_slice(hash.as_slice());
vec
}
fn hmac(data: &[u8], key: &[u8]) -> Result<Vec<u8>, InvalidKeyLength> {
type HmacSha256 = Hmac<Sha256_hash>;
let mut mac = HmacSha256::new_varkey(key)?;
mac.update(data);
let result = mac.finalize();
let mut vec = Vec::with_capacity(Sha256_hash::output_size());
vec.extend_from_slice(result.into_bytes().as_slice());
Ok(vec)
}
fn derive(password: &Password, salt: &[u8], iterations: u32) -> Result<Vec<u8>, DeriveError> {
match *password {
Password::Plain(ref plain) => {
let mut result = vec![0; 32];
pbkdf2::<Hmac<Sha256_hash>>(plain.as_bytes(), salt, iterations, &mut result);
Ok(result)
},
Password::Pbkdf2 { ref method, salt: ref my_salt, iterations: my_iterations, ref data } => {
if method != Self::name() {
Err(DeriveError::IncompatibleHashingMethod(method.to_string(), Self::name().to_string()))
}
else if my_salt == &salt {
Err(DeriveError::IncorrectSalt)
}
else if my_iterations == iterations {
Err(DeriveError::IncompatibleIterationCount(my_iterations, iterations))
}
else {
Ok(data.to_vec())
}
},
}
}
}