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use std::fmt;
const MD5_SHIFTS: [u8; 64] = [
7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22,
5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20,
4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23,
6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21
];
const MD5_K: [u32; 64] = [
0xD76AA478, 0xE8C7B756, 0x242070DB, 0xC1BDCEEE, 0xF57C0FAF, 0x4787C62A, 0xA8304613, 0xFD469501,
0x698098D8, 0x8B44F7AF, 0xFFFF5BB1, 0x895CD7BE, 0x6B901122, 0xFD987193, 0xA679438E, 0x49B40821,
0xF61E2562, 0xC040B340, 0x265E5A51, 0xE9B6C7AA, 0xD62F105D, 0x02441453, 0xD8A1E681, 0xE7D3FBC8,
0x21E1CDE6, 0xC33707D6, 0xF4D50D87, 0x455A14ED, 0xA9E3E905, 0xFCEFA3F8, 0x676F02D9, 0x8D2A4C8A,
0xFFFA3942, 0x8771F681, 0x6D9D6122, 0xFDE5380C, 0xA4BEEA44, 0x4BDECFA9, 0xF6BB4B60, 0xBEBFBC70,
0x289B7EC6, 0xEAA127FA, 0xD4EF3085, 0x04881D05, 0xD9D4D039, 0xE6DB99E5, 0x1FA27CF8, 0xC4AC5665,
0xF4292244, 0x432AFF97, 0xAB9423A7, 0xFC93A039, 0x655B59C3, 0x8F0CCC92, 0xFFEFF47D, 0x85845DD1,
0x6FA87E4F, 0xFE2CE6E0, 0xA3014314, 0x4E0811A1, 0xF7537E82, 0xBD3AF235, 0x2AD7D2BB, 0xEB86D391
];
const INITIAL_MD5_HASH: [u32; 4] = [ 0x67452301, 0xEFCDAB89, 0x98BADCFE, 0x10325476 ];
fn box0(b: u32, c: u32, d: u32) -> u32 { (b & c) | (!b & d) }
fn box1(b: u32, c: u32, d: u32) -> u32 { (d & b) | (!d & c) }
fn box2(b: u32, c: u32, d: u32) -> u32 { b ^ c ^ d }
fn box3(b: u32, c: u32, d: u32) -> u32 { c ^ (b | !d) }
#[derive(Clone)]
pub struct MD5 {
pub hash: [u32; 4],
inwords: [u32; 16],
buf: [u8; 64],
pos: usize,
count: usize,
}
impl PartialEq for MD5 {
fn eq(&self, other: &Self) -> bool {
self.hash == other.hash
}
}
impl Eq for MD5 { }
impl fmt::Display for MD5 {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{:08x}{:08x}{:08x}{:08x}", self.hash[0].swap_bytes(), self.hash[1].swap_bytes(), self.hash[2].swap_bytes(), self.hash[3].swap_bytes())
}
}
macro_rules! round {
($a: ident, $b: ident, $c: ident, $d: ident, $box: ident, $k: expr, $inval: expr) => {
let f = $box($b, $c, $d).wrapping_add($a).wrapping_add(MD5_K[$k]).wrapping_add($inval);
$a = $d;
$d = $c;
$c = $b;
$b = $b.wrapping_add(f.rotate_left(MD5_SHIFTS[$k].into()));
}
}
#[allow(dead_code)]
impl MD5 {
pub fn new() -> Self {
Self {
hash: INITIAL_MD5_HASH,
inwords: [0; 16],
buf: [0; 64],
pos: 0,
count: 0,
}
}
fn calc_one_block(&mut self) {
let mut a = self.hash[0];
let mut b = self.hash[1];
let mut c = self.hash[2];
let mut d = self.hash[3];
for (out, src) in self.inwords.iter_mut().zip(self.buf.chunks_exact(4)) {
*out = (u32::from(src[0]) << 0) |
(u32::from(src[1]) << 8) |
(u32::from(src[2]) << 16) |
(u32::from(src[3]) << 24);
}
for k in 0..16 { round!(a, b, c, d, box0, k, self.inwords[k]); }
for k in 16..32 { round!(a, b, c, d, box1, k, self.inwords[(5 * k + 1) & 0xF]); }
for k in 32..48 { round!(a, b, c, d, box2, k, self.inwords[(3 * k + 5) & 0xF]); }
for k in 48..64 { round!(a, b, c, d, box3, k, self.inwords[(7 * k) & 0xF]); }
self.hash[0] = self.hash[0].wrapping_add(a);
self.hash[1] = self.hash[1].wrapping_add(b);
self.hash[2] = self.hash[2].wrapping_add(c);
self.hash[3] = self.hash[3].wrapping_add(d);
self.pos = 0;
}
pub fn update_hash(&mut self, src: &[u8]) {
for byte in src.iter() {
self.buf[self.pos] = *byte;
self.pos += 1;
if self.pos == 64 {
self.calc_one_block();
}
}
self.count += src.len();
}
pub fn finish(&mut self) {
self.buf[self.pos] = 0x80;
self.pos += 1;
if self.pos > 48 {
while self.pos < 64 {
self.buf[self.pos] = 0x00;
self.pos += 1;
}
self.calc_one_block();
}
while self.pos < 64 {
self.buf[self.pos] = 0x00;
self.pos += 1;
}
for i in 0..8 {
self.buf[56 + i] = ((self.count * 8) >> (i * 8)) as u8;
}
self.calc_one_block();
}
pub fn get_hash(&self, dst: &mut [u32; 4]) {
for (dst, src) in dst.iter_mut().zip(self.hash.iter()) {
*dst = src.swap_bytes();
}
}
pub fn get_hash_bytes(&self, dst: &mut [u8; 4]) {
for (dst, src) in dst.chunks_exact_mut(4).zip(self.hash.iter()) {
dst[0] = (*src >> 0) as u8;
dst[1] = (*src >> 8) as u8;
dst[2] = (*src >> 16) as u8;
dst[3] = (*src >> 24) as u8;
}
}
pub fn calculate_hash(src: &[u8], hash: &mut [u32; 4]) {
let mut md5 = Self::new();
md5.update_hash(src);
md5.finish();
md5.get_hash(hash);
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn test_md5() {
let mut hash = [0u32; 4];
MD5::calculate_hash(&[], &mut hash);
assert_eq!(hash, [ 0xD41D8CD9, 0x8F00B204, 0xE9800998, 0xECF8427E ]);
MD5::calculate_hash(b"abc", &mut hash);
assert_eq!(hash, [ 0x90015098, 0x3CD24FB0, 0xD6963F7D, 0x28E17F72 ]);
MD5::calculate_hash(b"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq", &mut hash);
assert_eq!(hash, [ 0x8215EF07, 0x96A20BCA, 0xAAE116D3, 0x876C664A ]);
let mut md5 = MD5::new();
for _ in 0..1000000 {
md5.update_hash(b"a");
}
md5.finish();
md5.get_hash(&mut hash);
assert_eq!(hash, [ 0x7707D6AE, 0x4E027C70, 0xEEA2A935, 0xC2296F21 ]);
}
}
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