md5/
compress.rs

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1#![allow(clippy::many_single_char_names, clippy::unreadable_literal)]
2use core::convert::TryInto;
3
4const RC: [u32; 64] = [
5    // round 1
6    0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, 0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
7    0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be, 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
8    // round 2
9    0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
10    0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, 0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
11    // round 3
12    0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
13    0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05, 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
14    // round 4
15    0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, 0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
16    0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1, 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391,
17];
18
19#[inline(always)]
20fn op_f(w: u32, x: u32, y: u32, z: u32, m: u32, c: u32, s: u32) -> u32 {
21    ((x & y) | (!x & z))
22        .wrapping_add(w)
23        .wrapping_add(m)
24        .wrapping_add(c)
25        .rotate_left(s)
26        .wrapping_add(x)
27}
28#[inline(always)]
29fn op_g(w: u32, x: u32, y: u32, z: u32, m: u32, c: u32, s: u32) -> u32 {
30    ((x & z) | (y & !z))
31        .wrapping_add(w)
32        .wrapping_add(m)
33        .wrapping_add(c)
34        .rotate_left(s)
35        .wrapping_add(x)
36}
37
38#[inline(always)]
39fn op_h(w: u32, x: u32, y: u32, z: u32, m: u32, c: u32, s: u32) -> u32 {
40    (x ^ y ^ z)
41        .wrapping_add(w)
42        .wrapping_add(m)
43        .wrapping_add(c)
44        .rotate_left(s)
45        .wrapping_add(x)
46}
47
48#[inline(always)]
49fn op_i(w: u32, x: u32, y: u32, z: u32, m: u32, c: u32, s: u32) -> u32 {
50    (y ^ (x | !z))
51        .wrapping_add(w)
52        .wrapping_add(m)
53        .wrapping_add(c)
54        .rotate_left(s)
55        .wrapping_add(x)
56}
57
58#[inline]
59pub fn compress_block(state: &mut [u32; 4], input: &[u8; 64]) {
60    let mut a = state[0];
61    let mut b = state[1];
62    let mut c = state[2];
63    let mut d = state[3];
64
65    let mut data = [0u32; 16];
66    for (o, chunk) in data.iter_mut().zip(input.chunks_exact(4)) {
67        *o = u32::from_le_bytes(chunk.try_into().unwrap());
68    }
69
70    // round 1
71    a = op_f(a, b, c, d, data[0], RC[0], 7);
72    d = op_f(d, a, b, c, data[1], RC[1], 12);
73    c = op_f(c, d, a, b, data[2], RC[2], 17);
74    b = op_f(b, c, d, a, data[3], RC[3], 22);
75
76    a = op_f(a, b, c, d, data[4], RC[4], 7);
77    d = op_f(d, a, b, c, data[5], RC[5], 12);
78    c = op_f(c, d, a, b, data[6], RC[6], 17);
79    b = op_f(b, c, d, a, data[7], RC[7], 22);
80
81    a = op_f(a, b, c, d, data[8], RC[8], 7);
82    d = op_f(d, a, b, c, data[9], RC[9], 12);
83    c = op_f(c, d, a, b, data[10], RC[10], 17);
84    b = op_f(b, c, d, a, data[11], RC[11], 22);
85
86    a = op_f(a, b, c, d, data[12], RC[12], 7);
87    d = op_f(d, a, b, c, data[13], RC[13], 12);
88    c = op_f(c, d, a, b, data[14], RC[14], 17);
89    b = op_f(b, c, d, a, data[15], RC[15], 22);
90
91    // round 2
92    a = op_g(a, b, c, d, data[1], RC[16], 5);
93    d = op_g(d, a, b, c, data[6], RC[17], 9);
94    c = op_g(c, d, a, b, data[11], RC[18], 14);
95    b = op_g(b, c, d, a, data[0], RC[19], 20);
96
97    a = op_g(a, b, c, d, data[5], RC[20], 5);
98    d = op_g(d, a, b, c, data[10], RC[21], 9);
99    c = op_g(c, d, a, b, data[15], RC[22], 14);
100    b = op_g(b, c, d, a, data[4], RC[23], 20);
101
102    a = op_g(a, b, c, d, data[9], RC[24], 5);
103    d = op_g(d, a, b, c, data[14], RC[25], 9);
104    c = op_g(c, d, a, b, data[3], RC[26], 14);
105    b = op_g(b, c, d, a, data[8], RC[27], 20);
106
107    a = op_g(a, b, c, d, data[13], RC[28], 5);
108    d = op_g(d, a, b, c, data[2], RC[29], 9);
109    c = op_g(c, d, a, b, data[7], RC[30], 14);
110    b = op_g(b, c, d, a, data[12], RC[31], 20);
111
112    // round 3
113    a = op_h(a, b, c, d, data[5], RC[32], 4);
114    d = op_h(d, a, b, c, data[8], RC[33], 11);
115    c = op_h(c, d, a, b, data[11], RC[34], 16);
116    b = op_h(b, c, d, a, data[14], RC[35], 23);
117
118    a = op_h(a, b, c, d, data[1], RC[36], 4);
119    d = op_h(d, a, b, c, data[4], RC[37], 11);
120    c = op_h(c, d, a, b, data[7], RC[38], 16);
121    b = op_h(b, c, d, a, data[10], RC[39], 23);
122
123    a = op_h(a, b, c, d, data[13], RC[40], 4);
124    d = op_h(d, a, b, c, data[0], RC[41], 11);
125    c = op_h(c, d, a, b, data[3], RC[42], 16);
126    b = op_h(b, c, d, a, data[6], RC[43], 23);
127
128    a = op_h(a, b, c, d, data[9], RC[44], 4);
129    d = op_h(d, a, b, c, data[12], RC[45], 11);
130    c = op_h(c, d, a, b, data[15], RC[46], 16);
131    b = op_h(b, c, d, a, data[2], RC[47], 23);
132
133    // round 4
134    a = op_i(a, b, c, d, data[0], RC[48], 6);
135    d = op_i(d, a, b, c, data[7], RC[49], 10);
136    c = op_i(c, d, a, b, data[14], RC[50], 15);
137    b = op_i(b, c, d, a, data[5], RC[51], 21);
138
139    a = op_i(a, b, c, d, data[12], RC[52], 6);
140    d = op_i(d, a, b, c, data[3], RC[53], 10);
141    c = op_i(c, d, a, b, data[10], RC[54], 15);
142    b = op_i(b, c, d, a, data[1], RC[55], 21);
143
144    a = op_i(a, b, c, d, data[8], RC[56], 6);
145    d = op_i(d, a, b, c, data[15], RC[57], 10);
146    c = op_i(c, d, a, b, data[6], RC[58], 15);
147    b = op_i(b, c, d, a, data[13], RC[59], 21);
148
149    a = op_i(a, b, c, d, data[4], RC[60], 6);
150    d = op_i(d, a, b, c, data[11], RC[61], 10);
151    c = op_i(c, d, a, b, data[2], RC[62], 15);
152    b = op_i(b, c, d, a, data[9], RC[63], 21);
153
154    state[0] = state[0].wrapping_add(a);
155    state[1] = state[1].wrapping_add(b);
156    state[2] = state[2].wrapping_add(c);
157    state[3] = state[3].wrapping_add(d);
158}
159
160#[inline]
161pub fn compress(state: &mut [u32; 4], blocks: &[[u8; 64]]) {
162    for block in blocks {
163        compress_block(state, block)
164    }
165}
md5/compress.rs

md5/
compress.rs
