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: &[u8; 64] in blocks {
163 compress_block(state, input:block)
164 }
165}
166