crypto/
md5.rs

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
// Copyright 2013 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 cryptoutil::{write_u32_le, read_u32v_le, FixedBuffer, FixedBuffer64, StandardPadding};
use digest::Digest;
use step_by::RangeExt;


// A structure that represents that state of a digest computation for the MD5 digest function
#[derive(Clone, Copy)]
struct Md5State {
    s0: u32,
    s1: u32,
    s2: u32,
    s3: u32
}

impl Md5State {
    fn new() -> Md5State {
        Md5State {
            s0: 0x67452301,
            s1: 0xefcdab89,
            s2: 0x98badcfe,
            s3: 0x10325476
        }
    }

    fn reset(&mut self) {
        self.s0 = 0x67452301;
        self.s1 = 0xefcdab89;
        self.s2 = 0x98badcfe;
        self.s3 = 0x10325476;
    }

    fn process_block(&mut self, input: &[u8]) {
        fn f(u: u32, v: u32, w: u32) -> u32 {
            (u & v) | (!u & w)
        }

        fn g(u: u32, v: u32, w: u32) -> u32 {
            (u & w) | (v & !w)
        }

        fn h(u: u32, v: u32, w: u32) -> u32 {
            u ^ v ^ w
        }

        fn i(u: u32, v: u32, w: u32) -> u32 {
            v ^ (u | !w)
        }

        fn op_f(w: u32, x: u32, y: u32, z: u32, m: u32, s: u32) -> u32 {
            w.wrapping_add(f(x, y, z)).wrapping_add(m).rotate_left(s).wrapping_add(x)
        }

        fn op_g(w: u32, x: u32, y: u32, z: u32, m: u32, s: u32) -> u32 {
            w.wrapping_add(g(x, y, z)).wrapping_add(m).rotate_left(s).wrapping_add(x)
        }

        fn op_h(w: u32, x: u32, y: u32, z: u32, m: u32, s: u32) -> u32 {
            w.wrapping_add(h(x, y, z)).wrapping_add(m).rotate_left(s).wrapping_add(x)
        }

        fn op_i(w: u32, x: u32, y: u32, z: u32, m: u32, s: u32) -> u32 {
            w.wrapping_add(i(x, y, z)).wrapping_add(m).rotate_left(s).wrapping_add(x)
        }

        let mut a = self.s0;
        let mut b = self.s1;
        let mut c = self.s2;
        let mut d = self.s3;

        let mut data = [0u32; 16];

        read_u32v_le(&mut data, input);

        // round 1
        for i in (0..16).step_up(4) {
            a = op_f(a, b, c, d, data[i].wrapping_add(C1[i]), 7);
            d = op_f(d, a, b, c, data[i + 1].wrapping_add(C1[i + 1]), 12);
            c = op_f(c, d, a, b, data[i + 2].wrapping_add(C1[i + 2]), 17);
            b = op_f(b, c, d, a, data[i + 3].wrapping_add(C1[i + 3]), 22);
        }

        // round 2
        let mut t = 1;
        for i in (0..16).step_up(4) {
            a = op_g(a, b, c, d, data[t & 0x0f].wrapping_add(C2[i]), 5);
            d = op_g(d, a, b, c, data[(t + 5) & 0x0f].wrapping_add(C2[i + 1]), 9);
            c = op_g(c, d, a, b, data[(t + 10) & 0x0f].wrapping_add(C2[i + 2]), 14);
            b = op_g(b, c, d, a, data[(t + 15) & 0x0f].wrapping_add(C2[i + 3]), 20);
            t += 20;
        }

        // round 3
        t = 5;
        for i in (0..16).step_up(4) {
            a = op_h(a, b, c, d, data[t & 0x0f].wrapping_add(C3[i]), 4);
            d = op_h(d, a, b, c, data[(t + 3) & 0x0f].wrapping_add(C3[i + 1]), 11);
            c = op_h(c, d, a, b, data[(t + 6) & 0x0f].wrapping_add(C3[i + 2]), 16);
            b = op_h(b, c, d, a, data[(t + 9) & 0x0f].wrapping_add(C3[i + 3]), 23);
            t += 12;
        }

        // round 4
        t = 0;
        for i in (0..16).step_up(4) {
            a = op_i(a, b, c, d, data[t & 0x0f].wrapping_add(C4[i]), 6);
            d = op_i(d, a, b, c, data[(t + 7) & 0x0f].wrapping_add(C4[i + 1]), 10);
            c = op_i(c, d, a, b, data[(t + 14) & 0x0f].wrapping_add(C4[i + 2]), 15);
            b = op_i(b, c, d, a, data[(t + 21) & 0x0f].wrapping_add(C4[i + 3]), 21);
            t += 28;
        }

        self.s0 = self.s0.wrapping_add(a);
        self.s1 = self.s1.wrapping_add(b);
        self.s2 = self.s2.wrapping_add(c);
        self.s3 = self.s3.wrapping_add(d);
    }
}

// Round 1 constants
static C1: [u32; 16] = [
    0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, 0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
    0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be, 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821
];

// Round 2 constants
static C2: [u32; 16] = [
    0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
    0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, 0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a
];

// Round 3 constants
static C3: [u32; 16] = [
    0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
    0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05, 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665
];

// Round 4 constants
static C4: [u32; 16] = [
    0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, 0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
    0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1, 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391
];


/// The MD5 Digest algorithm
#[derive(Clone, Copy)]
pub struct Md5 {
    length_bytes: u64,
    buffer: FixedBuffer64,
    state: Md5State,
    finished: bool,
}

impl Md5 {
    /// Construct a new instance of the MD5 Digest.
    pub fn new() -> Md5 {
        Md5 {
            length_bytes: 0,
            buffer: FixedBuffer64::new(),
            state: Md5State::new(),
            finished: false
        }
    }
}

impl Digest for Md5 {
    fn input(&mut self, input: &[u8]) {
        assert!(!self.finished);
        // Unlike Sha1 and Sha2, the length value in MD5 is defined as the length of the message mod
        // 2^64 - ie: integer overflow is OK.
        self.length_bytes += input.len() as u64;
        let self_state = &mut self.state;
        self.buffer.input(input, |d: &[u8]| { self_state.process_block(d);}
        );
    }

    fn reset(&mut self) {
        self.length_bytes = 0;
        self.buffer.reset();
        self.state.reset();
        self.finished = false;
    }

    fn result(&mut self, out: &mut [u8]) {
        if !self.finished {
            let self_state = &mut self.state;
            self.buffer.standard_padding(8, |d: &[u8]| { self_state.process_block(d); });
            write_u32_le(self.buffer.next(4), (self.length_bytes << 3) as u32);
            write_u32_le(self.buffer.next(4), (self.length_bytes >> 29) as u32);
            self_state.process_block(self.buffer.full_buffer());
            self.finished = true;
        }

        write_u32_le(&mut out[0..4], self.state.s0);
        write_u32_le(&mut out[4..8], self.state.s1);
        write_u32_le(&mut out[8..12], self.state.s2);
        write_u32_le(&mut out[12..16], self.state.s3);
    }

    fn output_bits(&self) -> usize { 128 }

    fn block_size(&self) -> usize { 64 }
}


#[cfg(test)]
mod tests {
    use cryptoutil::test::test_digest_1million_random;
    use digest::Digest;
    use md5::Md5;


    struct Test {
        input: &'static str,
        output_str: &'static str,
    }

    fn test_hash<D: Digest>(sh: &mut D, tests: &[Test]) {
        // Test that it works when accepting the message all at once
        for t in tests.iter() {
            sh.input_str(t.input);

            let out_str = sh.result_str();
            assert_eq!(out_str, t.output_str);

            sh.reset();
        }

        // Test that it works when accepting the message in pieces
        for t in tests.iter() {
            let len = t.input.len();
            let mut left = len;
            while left > 0 {
                let take = (left + 1) / 2;
                sh.input_str(&t.input[len - left..take + len - left]);
                left = left - take;
            }

            let out_str = sh.result_str();
            assert_eq!(out_str, t.output_str);

            sh.reset();
        }
    }

    #[test]
    fn test_md5() {
        // Examples from wikipedia
        let wikipedia_tests = vec![
            Test {
                input: "",
                output_str: "d41d8cd98f00b204e9800998ecf8427e"
            },
            Test {
                input: "The quick brown fox jumps over the lazy dog",
                output_str: "9e107d9d372bb6826bd81d3542a419d6"
            },
            Test {
                input: "The quick brown fox jumps over the lazy dog.",
                output_str: "e4d909c290d0fb1ca068ffaddf22cbd0"
            },
        ];

        let tests = wikipedia_tests;

        let mut sh = Md5::new();

        test_hash(&mut sh, &tests[..]);
    }

    #[test]
    fn test_1million_random_md5() {
        let mut sh = Md5::new();
        test_digest_1million_random(
            &mut sh,
            64,
            "7707d6ae4e027c70eea2a935c2296f21");
    }
}


#[cfg(all(test, feature = "with-bench"))]
mod bench {
    use test::Bencher;

    use digest::Digest;
    use md5::Md5;


    #[bench]
    pub fn md5_10(bh: & mut Bencher) {
        let mut sh = Md5::new();
        let bytes = [1u8; 10];
        bh.iter( || {
            sh.input(&bytes);
        });
        bh.bytes = bytes.len() as u64;
    }

    #[bench]
    pub fn md5_1k(bh: & mut Bencher) {
        let mut sh = Md5::new();
        let bytes = [1u8; 1024];
        bh.iter( || {
            sh.input(&bytes);
        });
        bh.bytes = bytes.len() as u64;
    }

    #[bench]
    pub fn md5_64k(bh: & mut Bencher) {
        let mut sh = Md5::new();
        let bytes = [1u8; 65536];
        bh.iter( || {
            sh.input(&bytes);
        });
        bh.bytes = bytes.len() as u64;
    }
}