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ripemd160.rs
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ripemd160.rs
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use std::fs::File;
use std::io::Read;
fn preprocess(message: &[u8]) -> Vec<u8> {
let message_length: u64 = message.len() as u64 * 8;
let mut result = message.to_owned();
result.push(0x80);
while ((result.len() * 8) + 64) % 512 != 0 {
result.push(0);
}
// u64 -> little endian bytes
for b in 0..8 {
result.push((message_length >> (b * 8)) as u8);
}
result
}
// Non-linear functions at bit-level
fn func(j: usize, x: u32, y: u32, z: u32) -> u32 {
match j {
0...15 => x ^ y ^ z,
16...31 => (x & y) | (!x & z),
32...47 => (x | !y) ^ z,
48...63 => (x & z) | (y & !z),
64...79 => x ^ (y | !z),
_ => {
unreachable!();
}
}
}
const R_OFFSETS: &[usize] = &[
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 7, 4, 13, 1, 10, 6, 15, 3, 12, 0, 9, 5,
2, 14, 11, 8, 3, 10, 14, 4, 9, 15, 8, 1, 2, 7, 0, 6, 13, 11, 5, 12, 1, 9, 11, 10, 0, 8, 12, 4,
13, 3, 7, 15, 14, 5, 6, 2, 4, 0, 5, 9, 7, 12, 2, 10, 14, 1, 3, 8, 11, 6, 15, 13,
];
const R_P_OFFSETS: &[usize] = &[
5, 14, 7, 0, 9, 2, 11, 4, 13, 6, 15, 8, 1, 10, 3, 12, 6, 11, 3, 7, 0, 13, 5, 10, 14, 15, 8, 12,
4, 9, 1, 2, 15, 5, 1, 3, 7, 14, 6, 9, 11, 8, 12, 2, 10, 0, 4, 13, 8, 6, 4, 1, 3, 11, 15, 0, 5,
12, 2, 13, 9, 7, 10, 14, 12, 15, 10, 4, 1, 5, 8, 7, 6, 2, 13, 14, 0, 3, 9, 11,
];
fn word_select(i: usize, j: usize, msg: &[u8], offsets: &[usize]) -> u32 {
let word_offset = (i * 16 * 4) + (offsets[j] * 4);
// little-endian here
u32::from_be_bytes([
msg[word_offset + 3],
msg[word_offset + 2],
msg[word_offset + 1],
msg[word_offset + 0],
])
}
fn constant_k(j: usize) -> u32 {
match j {
0...15 => 0x00000000u32,
16...31 => 0x5A827999u32,
32...47 => 0x6ED9EBA1u32,
48...63 => 0x8F1BBCDCu32,
64...79 => 0xA953FD4Eu32,
_ => {
unreachable!();
}
}
}
fn constant_k_p(j: usize) -> u32 {
match j {
0...15 => 0x50A28BE6u32,
16...31 => 0x5C4DD124u32,
32...47 => 0x6D703EF3u32,
48...63 => 0x7A6D76E9u32,
64...79 => 0x00000000u32,
_ => {
unreachable!();
}
}
}
const ROTATIONS: &[u32] = &[
11, 14, 15, 12, 5, 8, 7, 9, 11, 13, 14, 15, 6, 7, 9, 8, 7, 6, 8, 13, 11, 9, 7, 15, 7, 12, 15,
9, 11, 7, 13, 12, 11, 13, 6, 7, 14, 9, 13, 15, 14, 8, 13, 6, 5, 12, 7, 5, 11, 12, 14, 15, 14,
15, 9, 8, 9, 14, 5, 6, 8, 6, 5, 12, 9, 15, 5, 11, 6, 8, 13, 12, 5, 12, 13, 14, 11, 8, 5, 6,
];
const ROTATIONS_P: &[u32] = &[
8, 9, 9, 11, 13, 15, 15, 5, 7, 7, 8, 11, 14, 14, 12, 6, 9, 13, 15, 7, 12, 8, 9, 11, 7, 7, 12,
7, 6, 15, 13, 11, 9, 7, 15, 11, 8, 6, 6, 14, 12, 13, 5, 14, 13, 13, 7, 5, 15, 5, 8, 11, 14, 14,
6, 14, 6, 9, 12, 9, 12, 5, 15, 8, 8, 5, 12, 9, 12, 5, 14, 6, 8, 13, 6, 5, 15, 13, 11, 11,
];
// Based on pseudocode from Appendix A:
// https://homes.esat.kuleuven.be/~bosselae/ripemd160/pdf/AB-9601/AB-9601.pdf
//
fn ripemd160(input: &[u8]) -> String {
let preprocessed_message = preprocess(input);
// Number of 16-word blocks in our padded message, where word-size is
// 32-bits. Called `t` in the original paper, but want to keep that
// variable free for the `T` variable used in each round.
assert!(preprocessed_message.len() % (4 * 16) == 0);
let rounds = preprocessed_message.len() / 4 / 16;
let mut h0 = 0x67452301u32;
let mut h1 = 0xEFCDAB89u32;
let mut h2 = 0x98BADCFEu32;
let mut h3 = 0x10325476u32;
let mut h4 = 0xC3D2E1F0u32;
// a corresponds to A in the original paper; a_p corresponds to A'
for i in 0..rounds {
let mut a = h0;
let mut b = h1;
let mut c = h2;
let mut d = h3;
let mut e = h4;
let mut a_p = h0;
let mut b_p = h1;
let mut c_p = h2;
let mut d_p = h3;
let mut e_p = h4;
let mut t;
for j in 0..80 {
t = a
.wrapping_add(func(j, b, c, d))
.wrapping_add(word_select(i, j, &preprocessed_message, R_OFFSETS))
.wrapping_add(constant_k(j))
.rotate_left(ROTATIONS[j])
.wrapping_add(e);
a = e;
e = d;
d = c.rotate_left(10);
c = b;
b = t;
t = a_p
.wrapping_add(func(79 - j, b_p, c_p, d_p))
.wrapping_add(word_select(i, j, &preprocessed_message, R_P_OFFSETS))
.wrapping_add(constant_k_p(j))
.rotate_left(ROTATIONS_P[j])
.wrapping_add(e_p);
a_p = e_p;
e_p = d_p;
d_p = c_p.rotate_left(10);
c_p = b_p;
b_p = t;
}
t = h1.wrapping_add(c).wrapping_add(d_p);
h1 = h2.wrapping_add(d).wrapping_add(e_p);
h2 = h3.wrapping_add(e).wrapping_add(a_p);
h3 = h4.wrapping_add(a).wrapping_add(b_p);
h4 = h0.wrapping_add(b).wrapping_add(c_p);
h0 = t;
}
let mut result = String::new();
for v in &[h0, h1, h2, h3, h4] {
result.push_str(&format!(
"{:02x}{:02x}{:02x}{:02x}",
(v >> 0) as u8,
(v >> 8) as u8,
(v >> 16) as u8,
(v >> 24) as u8
));
}
result
}
fn main() {
let args: Vec<String> = std::env::args().collect();
let file = File::open(args[1].clone()).expect("Failed to open input file");
let content: Vec<u8> = file.bytes().map(Result::unwrap).collect();
println!("{} {}", args[1], ripemd160(&content));
}