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#![no_std]
#![doc(
html_logo_url = "https://raw.githubusercontent.com/RustCrypto/media/26acc39f/logo.svg",
html_favicon_url = "https://raw.githubusercontent.com/RustCrypto/media/26acc39f/logo.svg",
html_root_url = "https://docs.rs/blowfish/0.9.1"
)]
#![deny(unsafe_code)]
#![cfg_attr(docsrs, feature(doc_cfg))]
#![warn(missing_docs, rust_2018_idioms)]
pub use cipher;
use byteorder::{ByteOrder, BE, LE};
use cipher::{
consts::{U56, U8},
AlgorithmName, BlockCipher, InvalidLength, Key, KeyInit, KeySizeUser,
};
use core::fmt;
use core::marker::PhantomData;
#[cfg(feature = "zeroize")]
use cipher::zeroize::{Zeroize, ZeroizeOnDrop};
mod consts;
pub type BlowfishLE = Blowfish<LE>;
#[derive(Clone)]
pub struct Blowfish<T: ByteOrder = BE> {
s: [[u32; 256]; 4],
p: [u32; 18],
_pd: PhantomData<T>,
}
fn next_u32_wrap(buf: &[u8], offset: &mut usize) -> u32 {
let mut v = 0;
for _ in 0..4 {
if *offset >= buf.len() {
*offset = 0;
}
v = (v << 8) | buf[*offset] as u32;
*offset += 1;
}
v
}
impl<T: ByteOrder> Blowfish<T> {
fn init_state() -> Blowfish<T> {
Blowfish {
p: consts::P,
s: consts::S,
_pd: PhantomData,
}
}
fn expand_key(&mut self, key: &[u8]) {
let mut key_pos = 0;
for i in 0..18 {
self.p[i] ^= next_u32_wrap(key, &mut key_pos);
}
let mut lr = [0u32; 2];
for i in 0..9 {
lr = self.encrypt(lr);
self.p[2 * i] = lr[0];
self.p[2 * i + 1] = lr[1];
}
for i in 0..4 {
for j in 0..128 {
lr = self.encrypt(lr);
self.s[i][2 * j] = lr[0];
self.s[i][2 * j + 1] = lr[1];
}
}
}
#[allow(clippy::many_single_char_names)]
fn round_function(&self, x: u32) -> u32 {
let a = self.s[0][(x >> 24) as usize];
let b = self.s[1][((x >> 16) & 0xff) as usize];
let c = self.s[2][((x >> 8) & 0xff) as usize];
let d = self.s[3][(x & 0xff) as usize];
(a.wrapping_add(b) ^ c).wrapping_add(d)
}
fn encrypt(&self, [mut l, mut r]: [u32; 2]) -> [u32; 2] {
for i in 0..8 {
l ^= self.p[2 * i];
r ^= self.round_function(l);
r ^= self.p[2 * i + 1];
l ^= self.round_function(r);
}
l ^= self.p[16];
r ^= self.p[17];
[r, l]
}
fn decrypt(&self, [mut l, mut r]: [u32; 2]) -> [u32; 2] {
for i in (1..9).rev() {
l ^= self.p[2 * i + 1];
r ^= self.round_function(l);
r ^= self.p[2 * i];
l ^= self.round_function(r);
}
l ^= self.p[1];
r ^= self.p[0];
[r, l]
}
}
impl<T: ByteOrder> BlockCipher for Blowfish<T> {}
impl<T: ByteOrder> KeySizeUser for Blowfish<T> {
type KeySize = U56;
}
impl<T: ByteOrder> KeyInit for Blowfish<T> {
fn new(key: &Key<Self>) -> Self {
Self::new_from_slice(&key[..]).unwrap()
}
fn new_from_slice(key: &[u8]) -> Result<Self, InvalidLength> {
if key.len() < 4 || key.len() > 56 {
return Err(InvalidLength);
}
let mut blowfish = Blowfish::init_state();
blowfish.expand_key(key);
Ok(blowfish)
}
}
impl fmt::Debug for Blowfish<BE> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("Blowfish<BE> { ... }")
}
}
impl AlgorithmName for Blowfish<BE> {
fn write_alg_name(f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("Blowfish<BE>")
}
}
impl fmt::Debug for Blowfish<LE> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("Blowfish<LE> { ... }")
}
}
impl AlgorithmName for Blowfish<LE> {
fn write_alg_name(f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("Blowfish<LE>")
}
}
#[cfg(feature = "zeroize")]
#[cfg_attr(docsrs, doc(cfg(feature = "zeroize")))]
impl<T: ByteOrder> Drop for Blowfish<T> {
fn drop(&mut self) {
self.s.zeroize();
self.p.zeroize();
}
}
#[cfg(feature = "zeroize")]
#[cfg_attr(docsrs, doc(cfg(feature = "zeroize")))]
impl<T: ByteOrder> ZeroizeOnDrop for Blowfish<T> {}
cipher::impl_simple_block_encdec!(
<T: ByteOrder> Blowfish, U8, cipher, block,
encrypt: {
let mut b = [0u32; 2];
T::read_u32_into(block.get_in(), &mut b);
b = cipher.encrypt(b);
T::write_u32_into(&b, block.get_out());
}
decrypt: {
let mut b = [0u32; 2];
T::read_u32_into(block.get_in(), &mut b);
b = cipher.decrypt(b);
T::write_u32_into(&b, block.get_out());
}
);
#[cfg(feature = "bcrypt")]
impl Blowfish<BE> {
pub fn salted_expand_key(&mut self, salt: &[u8], key: &[u8]) {
let mut key_pos = 0;
for i in 0..18 {
self.p[i] ^= next_u32_wrap(key, &mut key_pos);
}
let mut lr = [0u32; 2];
let mut salt_pos = 0;
for i in 0..9 {
lr[0] ^= next_u32_wrap(salt, &mut salt_pos);
lr[1] ^= next_u32_wrap(salt, &mut salt_pos);
lr = self.encrypt(lr);
self.p[2 * i] = lr[0];
self.p[2 * i + 1] = lr[1];
}
for i in 0..4 {
for j in 0..64 {
lr[0] ^= next_u32_wrap(salt, &mut salt_pos);
lr[1] ^= next_u32_wrap(salt, &mut salt_pos);
lr = self.encrypt(lr);
self.s[i][4 * j] = lr[0];
self.s[i][4 * j + 1] = lr[1];
lr[0] ^= next_u32_wrap(salt, &mut salt_pos);
lr[1] ^= next_u32_wrap(salt, &mut salt_pos);
lr = self.encrypt(lr);
self.s[i][4 * j + 2] = lr[0];
self.s[i][4 * j + 3] = lr[1];
}
}
}
pub fn bc_init_state() -> Blowfish<BE> {
Blowfish::init_state()
}
pub fn bc_encrypt(&self, lr: [u32; 2]) -> [u32; 2] {
self.encrypt(lr)
}
pub fn bc_expand_key(&mut self, key: &[u8]) {
self.expand_key(key)
}
}