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#![no_std]
extern crate generic_array;
extern crate fake_simd as simd;
extern crate byte_tools;
extern crate digest;
extern crate digest_buffer;
pub use digest::Digest;
use byte_tools::{write_u32_le, read_u32v_le};
use digest_buffer::{DigestBuffer};
use simd::u32x4;
use generic_array::GenericArray;
use generic_array::typenum::{U16, U64};
mod consts;
use consts::{C1, C2, C3, C4, S};
type BlockSize = U64;
type Block = GenericArray<u8, BlockSize>;
#[derive(Copy, Clone)]
struct Md5State {
s: u32x4,
}
impl Md5State {
fn process_block(&mut self, input: &Block) {
fn f(u: u32, v: u32, w: u32) -> u32 { (u & v) | (!u & w) }
fn g(u: u32, v: u32, w: u32) -> u32 { (u & w) | (v & !w) }
fn h(u: u32, v: u32, w: u32) -> u32 { u ^ v ^ w }
fn i(u: u32, v: u32, w: u32) -> u32 { v ^ (u | !w) }
fn op_f(w: u32, x: u32, y: u32, z: u32, m: u32, s: u32) -> u32 {
w.wrapping_add(f(x, y, z))
.wrapping_add(m)
.rotate_left(s)
.wrapping_add(x)
}
fn op_g(w: u32, x: u32, y: u32, z: u32, m: u32, s: u32) -> u32 {
w.wrapping_add(g(x, y, z))
.wrapping_add(m)
.rotate_left(s)
.wrapping_add(x)
}
fn op_h(w: u32, x: u32, y: u32, z: u32, m: u32, s: u32) -> u32 {
w.wrapping_add(h(x, y, z))
.wrapping_add(m)
.rotate_left(s)
.wrapping_add(x)
}
fn op_i(w: u32, x: u32, y: u32, z: u32, m: u32, s: u32) -> u32 {
w.wrapping_add(i(x, y, z))
.wrapping_add(m)
.rotate_left(s)
.wrapping_add(x)
}
let u32x4(mut a, mut b, mut c, mut d) = self.s;
let mut data = [0u32; 16];
read_u32v_le(&mut data, input);
for i in [0, 4, 8, 12].iter().cloned() {
a = op_f(a, b, c, d, data[i].wrapping_add(C1[i]), 7);
d = op_f(d, a, b, c, data[i + 1].wrapping_add(C1[i + 1]), 12);
c = op_f(c, d, a, b, data[i + 2].wrapping_add(C1[i + 2]), 17);
b = op_f(b, c, d, a, data[i + 3].wrapping_add(C1[i + 3]), 22);
}
let mut t = 1;
for i in [0, 4, 8, 12].iter().cloned() {
let q = data[t & 0x0f].wrapping_add(C2[i]);
a = op_g(a, b, c, d, q, 5);
let q = data[(t + 5) & 0x0f].wrapping_add(C2[i + 1]);
d = op_g(d, a, b, c, q, 9);
let q = data[(t + 10) & 0x0f].wrapping_add(C2[i + 2]);
c = op_g(c, d, a, b, q, 14);
let q = data[(t + 15) & 0x0f].wrapping_add(C2[i + 3]);
b = op_g(b, c, d, a, q, 20);
t += 20;
}
t = 5;
for i in [0, 4, 8, 12].iter().cloned() {
let q = data[t & 0x0f].wrapping_add(C3[i]);
a = op_h(a, b, c, d, q, 4);
let q = data[(t + 3) & 0x0f].wrapping_add(C3[i + 1]);
d = op_h(d, a, b, c, q, 11);
let q = data[(t + 6) & 0x0f].wrapping_add(C3[i + 2]);
c = op_h(c, d, a, b, q, 16);
let q = data[(t + 9) & 0x0f].wrapping_add(C3[i + 3]);
b = op_h(b, c, d, a, q, 23);
t += 12;
}
t = 0;
for i in [0, 4, 8, 12].iter().cloned() {
let q = data[t & 0x0f].wrapping_add(C4[i]);
a = op_i(a, b, c, d, q, 6);
let q = data[(t + 7) & 0x0f].wrapping_add(C4[i + 1]);
d = op_i(d, a, b, c, q, 10);
let q = data[(t + 14) & 0x0f].wrapping_add(C4[i + 2]);
c = op_i(c, d, a, b, q, 15);
let q = data[(t + 21) & 0x0f].wrapping_add(C4[i + 3]);
b = op_i(b, c, d, a, q, 21);
t += 28;
}
self.s = self.s + u32x4(a, b, c, d);
}
}
impl Default for Md5State {
fn default() -> Self { Md5State{ s: S } }
}
#[derive(Copy, Clone, Default)]
pub struct Md5 {
length_bytes: u64,
buffer: DigestBuffer<BlockSize>,
state: Md5State,
}
impl Md5 {
fn finalize(&mut self) {
let self_state = &mut self.state;
self.buffer.standard_padding(8, |d: &Block| {
self_state.process_block(d);
});
write_u32_le(self.buffer.next(4), (self.length_bytes << 3) as u32);
write_u32_le(self.buffer.next(4), (self.length_bytes >> 29) as u32);
self_state.process_block(self.buffer.full_buffer());
}
}
impl digest::Input for Md5 {
type BlockSize = BlockSize;
fn digest(&mut self, input: &[u8]) {
self.length_bytes += input.len() as u64;
let self_state = &mut self.state;
self.buffer.input(input, |d: &Block| {
self_state.process_block(d);
});
}
}
impl digest::FixedOutput for Md5 {
type OutputSize = U16;
fn fixed_result(mut self) -> GenericArray<u8, Self::OutputSize> {
self.finalize();
let mut out = GenericArray::default();
write_u32_le(&mut out[0..4], self.state.s.0);
write_u32_le(&mut out[4..8], self.state.s.1);
write_u32_le(&mut out[8..12], self.state.s.2);
write_u32_le(&mut out[12..16], self.state.s.3);
out
}
}