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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use core::str;
use core::uint;
use core::vec;
struct Quad {
a: u32,
b: u32,
c: u32,
d: u32
}
pub fn md4(msg: &[u8]) -> Quad {
// subtle: if orig_len is merely uint, then the code below
// which performs shifts by 32 bits or more has undefined
// results.
let orig_len: u64 = (vec::len(msg) * 8u) as u64;
// pad message
let mut msg = vec::append(vec::from_slice(msg), ~[0x80u8]);
let mut bitlen = orig_len + 8u64;
while (bitlen + 64u64) % 512u64 > 0u64 {
unsafe {msg.push(0u8);}
bitlen += 8u64;
}
// append length
let mut i = 0u64;
while i < 8u64 {
unsafe {msg.push((orig_len >> (i * 8u64)) as u8);}
i += 1u64;
}
let mut a = 0x67452301u32;
let mut b = 0xefcdab89u32;
let mut c = 0x98badcfeu32;
let mut d = 0x10325476u32;
fn rot(r: int, x: u32) -> u32 {
let r = r as u32;
(x << r) | (x >> (32u32 - r))
}
let mut i = 0u;
let e = vec::len(msg);
let mut x = vec::from_elem(16u, 0u32);
while i < e {
let aa = a, bb = b, cc = c, dd = d;
let mut j = 0u, base = i;
while j < 16u {
x[j] = (msg[base] as u32) + (msg[base + 1u] as u32 << 8u32) +
(msg[base + 2u] as u32 << 16u32) +
(msg[base + 3u] as u32 << 24u32);
j += 1u; base += 4u;
}
let mut j = 0u;
while j < 16u {
a = rot(3, a + ((b & c) | (!b & d)) + x[j]);
j += 1u;
d = rot(7, d + ((a & b) | (!a & c)) + x[j]);
j += 1u;
c = rot(11, c + ((d & a) | (!d & b)) + x[j]);
j += 1u;
b = rot(19, b + ((c & d) | (!c & a)) + x[j]);
j += 1u;
}
let mut j = 0u;
let q = 0x5a827999u32;
while j < 4u {
a = rot(3, a + ((b & c) | ((b & d) | (c & d))) + x[j] + q);
d = rot(5, d + ((a & b) | ((a & c) | (b & c))) + x[j + 4u] + q);
c = rot(9, c + ((d & a) | ((d & b) | (a & b))) + x[j + 8u] + q);
b = rot(13, b + ((c & d) | ((c & a) | (d & a))) + x[j + 12u] + q);
j += 1u;
}
let mut j = 0u;
let q = 0x6ed9eba1u32;
while j < 8u {
let jj = if j > 2u { j - 3u } else { j };
a = rot(3, a + (b ^ c ^ d) + x[jj] + q);
d = rot(9, d + (a ^ b ^ c) + x[jj + 8u] + q);
c = rot(11, c + (d ^ a ^ b) + x[jj + 4u] + q);
b = rot(15, b + (c ^ d ^ a) + x[jj + 12u] + q);
j += 2u;
}
a += aa; b += bb; c += cc; d += dd;
i += 64u;
}
return Quad {a: a, b: b, c: c, d: d};
}
pub fn md4_str(msg: &[u8]) -> ~str {
let Quad {a, b, c, d} = md4(msg);
fn app(a: u32, b: u32, c: u32, d: u32, f: &fn(u32)) {
f(a); f(b); f(c); f(d);
}
let mut result = ~"";
do app(a, b, c, d) |u| {
let mut i = 0u32;
while i < 4u32 {
let byte = (u >> (i * 8u32)) as u8;
if byte <= 16u8 { result += ~"0"; }
result += uint::to_str_radix(byte as uint, 16u);
i += 1u32;
}
}
result
}
pub fn md4_text(msg: &str) -> ~str { md4_str(str::to_bytes(msg)) }
#[test]
fn test_md4() {
assert!(md4_text(~"") == ~"31d6cfe0d16ae931b73c59d7e0c089c0");
assert!(md4_text(~"a") == ~"bde52cb31de33e46245e05fbdbd6fb24");
assert!(md4_text(~"abc") == ~"a448017aaf21d8525fc10ae87aa6729d");
assert!(md4_text(~"message digest") ==
~"d9130a8164549fe818874806e1c7014b");
assert!(md4_text(~"abcdefghijklmnopqrstuvwxyz") ==
~"d79e1c308aa5bbcdeea8ed63df412da9");
assert!(md4_text(
~"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\
0123456789") == ~"043f8582f241db351ce627e153e7f0e4");
assert!(md4_text(~"1234567890123456789012345678901234567890123456789\
0123456789012345678901234567890") ==
~"e33b4ddc9c38f2199c3e7b164fcc0536");
}
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