lpn 0.2.0

Software to study attacks on the Learning Parity with Noise problem
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
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349

use std::boxed::Box;
use std::default::Default;
use std::sync::Once;

use fnv::FnvHashMap;

use m4ri_rust::friendly::BinMatrix;
use m4ri_rust::friendly::BinVector;

use crate::codes::BinaryCode;

/// ``[23, 21]`` Guava code
///
/// Best code found from the GUAVA database version 3.15
///
/// Decodes using Syndrome decoding
#[derive(Clone, Serialize)]
pub struct GuavaCode23_21;

static INIT: Once = Once::new();
static mut GENERATOR_MATRIX: *const BinMatrix = 0 as *const BinMatrix;
static mut PARITY_MATRIX: *const BinMatrix = 0 as *const BinMatrix;
static mut PARITY_MATRIX_T: *const BinMatrix = 0 as *const BinMatrix;
static mut SYNDROME_MAP: *const FnvHashMap<u64, &'static [usize; 1]> = 0 as *const FnvHashMap<u64, &'static [usize; 1]>;

fn init() {
    INIT.call_once(|| {
        unsafe {
            let matrix = Box::new(BinMatrix::from_slices(&[
                &[ 2097153 ],
                &[ 2097154 ],
                &[ 2097156 ],
                &[ 2097160 ],
                &[ 2097168 ],
                &[ 2097184 ],
                &[ 2097216 ],
                &[ 2097280 ],
                &[ 2097408 ],
                &[ 2097664 ],
                &[ 2098176 ],
                &[ 2099200 ],
                &[ 2101248 ],
                &[ 2105344 ],
                &[ 2113536 ],
                &[ 2129920 ],
                &[ 2162688 ],
                &[ 2228224 ],
                &[ 2359296 ],
                &[ 2621440 ],
                &[ 3145728 ],
                
            ], 23));
            GENERATOR_MATRIX = Box::into_raw(matrix);

            let matrix = Box::new(BinMatrix::from_slices(&[
                &[ 4194303 ],
                &[ 4194304 ],
                
            ], 23));
            let matrix_t = Box::new(matrix.transposed());
            PARITY_MATRIX = Box::into_raw(matrix);
            PARITY_MATRIX_T = Box::into_raw(matrix_t);

            let mut map = Box::new(FnvHashMap::with_capacity_and_hasher(4, Default::default()));
            map.insert(0, &[0]);     // 0 => [0]
            map.insert(1, &[1]);     // 1 => [1]
            map.insert(2, &[4194304]);     // 2 => [4194304]
            map.insert(3, &[4194305]);     // 3 => [4194305]
            
            SYNDROME_MAP = Box::into_raw(map);
        }
    });
}

impl GuavaCode23_21 {
    fn parity_check_matrix_transposed(&self) -> &BinMatrix {
        init();
        unsafe {
            PARITY_MATRIX_T.as_ref().unwrap()
        }
    }
}

impl BinaryCode for GuavaCode23_21 {
    fn name(&self) -> String {
        "[23, 21] Guava code".to_owned()
    }

    fn length(&self) -> usize {
        23
    }

    fn dimension(&self) -> usize {
        21
    }

    fn generator_matrix(&self) -> &BinMatrix {
        init();
        unsafe {
            GENERATOR_MATRIX.as_ref().unwrap()
        }
    }

    fn parity_check_matrix(&self) -> &BinMatrix {
        init();
        unsafe {
            PARITY_MATRIX.as_ref().unwrap()
        }
    }

    fn decode_to_code(&self, c: &BinVector) -> Result<BinVector, &str> {
        init();
        let map = unsafe {
            SYNDROME_MAP.as_ref().unwrap()
        };
        debug_assert_eq!(c.len(), self.length(), "the length doesn't match the expected length (length of the code)");
        let he = c * self.parity_check_matrix_transposed();
        let mut error = BinVector::with_capacity(23);
        let stor = unsafe { error.get_storage_mut() };
        let errbytes = map[&he.as_u64()];
        debug_assert_eq!(errbytes.len(), 23 / 64 + if 23 % 64 != 0 { 1 } else { 0 });
        stor.clear();
        stor.extend_from_slice(&errbytes[..]);
        unsafe { error.set_len(23) };
        debug_assert_eq!(error.len(), self.length(), "internal: the error vector is of the wrong length");
        let result = c + &error;
        debug_assert_eq!(result.len(), self.length(), "internal: the result vector is of the wrong length");
        debug_assert_eq!((&result * self.parity_check_matrix_transposed()).count_ones(), 0);
        Ok(result)
    }

    fn decode_to_message(&self, c: &BinVector) -> Result<BinVector, &str> {
        
        let mut codeword = self.decode_to_code(c)?;
        codeword.truncate(21);
        Ok(codeword)
        
    }

    fn decode_slice(&self, c: &mut [u64]) {
        init();
        
        debug_assert_eq!(c[23 / 64] & !((1 << 23) - 1), 0, "this message has excess bits");

        let map = unsafe {
            SYNDROME_MAP.as_ref().unwrap()
        };
        let he = &BinMatrix::from_slices(&[&c[..]], self.length()) * self.parity_check_matrix_transposed();
        let error = map[unsafe { &he.get_word_unchecked(0, 0) }];
        c.iter_mut().zip(error.iter().copied()).for_each(|(sample, error)| *sample ^= error as u64);
    }

    
}

#[cfg(test)]
mod tests {
    use super::*;
    use m4ri_rust::friendly::BinVector;
    use crate::oracle::Sample;

    #[test]
    fn size() {
        let code = GuavaCode23_21.generator_matrix();
        assert_eq!(code.ncols(), 23);
        assert_eq!(code.nrows(), 21);
    }

    #[test]
    fn test_decode_sample() {
        let code = GuavaCode23_21;
        for _ in 0..1000 {
            // setup
            let vec = BinVector::random(code.length());
            let mut sample_a = Sample::from_binvector(&vec, false);
            let mut sample_b = Sample::from_binvector(&vec, true);
            
            let decoded_vec = code.decode_to_message(&vec).unwrap();
            println!("decoded_vec: {:?}", decoded_vec);

            // test vectors
            let decoded_vec_sample_a = Sample::from_binvector(&decoded_vec, false);
            let decoded_vec_sample_b = Sample::from_binvector(&decoded_vec, true);

            code.decode_sample(&mut sample_a);
            code.decode_sample(&mut sample_b);
            assert_eq!(sample_a.get_product(), false);
            assert_eq!(sample_b.get_product(), true);
            assert_eq!(sample_a, decoded_vec_sample_a);
            assert_eq!(sample_b, decoded_vec_sample_b);
        }
    }

    #[test]
    fn random_decode_tests() {

        
        {
            let code = GuavaCode23_21;
            let randvec = BinVector::from_bools(&[true, false, false, true, true, true, false, true, false, true, false, false, true, true, false, true, true, true, false, true, true, true, false]);
            let codeword = BinVector::from_bools(&[true, false, false, true, true, true, false, true, false, true, false, false, true, true, false, true, true, true, false, true, true, true, false]);
            assert_eq!(code.decode_to_code(&randvec), Ok(codeword));
        }
        
        {
            let code = GuavaCode23_21;
            let randvec = BinVector::from_bools(&[false, true, false, false, false, true, false, true, true, false, true, false, false, false, true, false, true, true, false, true, true, true, false]);
            let codeword = BinVector::from_bools(&[true, true, false, false, false, true, false, true, true, false, true, false, false, false, true, false, true, true, false, true, true, true, false]);
            assert_eq!(code.decode_to_code(&randvec), Ok(codeword));
        }
        
        {
            let code = GuavaCode23_21;
            let randvec = BinVector::from_bools(&[false, true, true, false, false, true, true, true, true, false, false, true, false, true, true, true, false, false, true, true, false, false, false]);
            let codeword = BinVector::from_bools(&[false, true, true, false, false, true, true, true, true, false, false, true, false, true, true, true, false, false, true, true, false, false, false]);
            assert_eq!(code.decode_to_code(&randvec), Ok(codeword));
        }
        
        {
            let code = GuavaCode23_21;
            let randvec = BinVector::from_bools(&[true, false, true, true, false, false, false, true, true, true, false, true, false, false, false, true, false, true, true, false, false, true, true]);
            let codeword = BinVector::from_bools(&[false, false, true, true, false, false, false, true, true, true, false, true, false, false, false, true, false, true, true, false, false, true, false]);
            assert_eq!(code.decode_to_code(&randvec), Ok(codeword));
        }
        
        {
            let code = GuavaCode23_21;
            let randvec = BinVector::from_bools(&[true, false, false, true, false, false, false, false, true, false, true, true, true, false, false, false, false, false, true, true, false, false, false]);
            let codeword = BinVector::from_bools(&[true, false, false, true, false, false, false, false, true, false, true, true, true, false, false, false, false, false, true, true, false, false, false]);
            assert_eq!(code.decode_to_code(&randvec), Ok(codeword));
        }
        
        {
            let code = GuavaCode23_21;
            let randvec = BinVector::from_bools(&[false, true, false, false, true, false, false, true, false, false, false, true, false, false, true, false, true, false, true, true, true, false, true]);
            let codeword = BinVector::from_bools(&[true, true, false, false, true, false, false, true, false, false, false, true, false, false, true, false, true, false, true, true, true, false, false]);
            assert_eq!(code.decode_to_code(&randvec), Ok(codeword));
        }
        
        {
            let code = GuavaCode23_21;
            let randvec = BinVector::from_bools(&[false, false, false, false, false, false, true, false, true, false, false, true, true, true, true, true, true, true, false, true, false, true, false]);
            let codeword = BinVector::from_bools(&[true, false, false, false, false, false, true, false, true, false, false, true, true, true, true, true, true, true, false, true, false, true, false]);
            assert_eq!(code.decode_to_code(&randvec), Ok(codeword));
        }
        
        {
            let code = GuavaCode23_21;
            let randvec = BinVector::from_bools(&[false, true, false, true, true, true, false, false, true, true, false, false, false, true, true, true, false, false, false, false, true, false, false]);
            let codeword = BinVector::from_bools(&[false, true, false, true, true, true, false, false, true, true, false, false, false, true, true, true, false, false, false, false, true, false, false]);
            assert_eq!(code.decode_to_code(&randvec), Ok(codeword));
        }
        
        {
            let code = GuavaCode23_21;
            let randvec = BinVector::from_bools(&[false, true, false, false, true, false, false, false, true, true, false, true, true, false, false, true, false, false, false, true, true, false, false]);
            let codeword = BinVector::from_bools(&[true, true, false, false, true, false, false, false, true, true, false, true, true, false, false, true, false, false, false, true, true, false, false]);
            assert_eq!(code.decode_to_code(&randvec), Ok(codeword));
        }
        
        {
            let code = GuavaCode23_21;
            let randvec = BinVector::from_bools(&[true, true, true, true, false, true, false, true, false, false, false, false, true, false, true, false, false, true, true, true, true, false, true]);
            let codeword = BinVector::from_bools(&[true, true, true, true, false, true, false, true, false, false, false, false, true, false, true, false, false, true, true, true, true, false, false]);
            assert_eq!(code.decode_to_code(&randvec), Ok(codeword));
        }
        
        {
            let code = GuavaCode23_21;
            let randvec = BinVector::from_bools(&[false, true, false, true, false, false, false, true, true, true, false, false, true, false, true, false, true, false, false, true, false, true, false]);
            let codeword = BinVector::from_bools(&[false, true, false, true, false, false, false, true, true, true, false, false, true, false, true, false, true, false, false, true, false, true, false]);
            assert_eq!(code.decode_to_code(&randvec), Ok(codeword));
        }
        
        {
            let code = GuavaCode23_21;
            let randvec = BinVector::from_bools(&[true, true, false, true, true, false, false, false, false, false, false, false, false, false, false, true, false, false, true, true, true, true, false]);
            let codeword = BinVector::from_bools(&[false, true, false, true, true, false, false, false, false, false, false, false, false, false, false, true, false, false, true, true, true, true, false]);
            assert_eq!(code.decode_to_code(&randvec), Ok(codeword));
        }
        
        {
            let code = GuavaCode23_21;
            let randvec = BinVector::from_bools(&[true, true, false, true, true, false, false, false, true, false, false, true, false, false, false, false, true, false, true, true, false, true, true]);
            let codeword = BinVector::from_bools(&[true, true, false, true, true, false, false, false, true, false, false, true, false, false, false, false, true, false, true, true, false, true, false]);
            assert_eq!(code.decode_to_code(&randvec), Ok(codeword));
        }
        
        {
            let code = GuavaCode23_21;
            let randvec = BinVector::from_bools(&[true, true, true, false, false, false, false, false, true, false, false, true, true, true, true, false, true, true, false, false, true, true, true]);
            let codeword = BinVector::from_bools(&[true, true, true, false, false, false, false, false, true, false, false, true, true, true, true, false, true, true, false, false, true, true, false]);
            assert_eq!(code.decode_to_code(&randvec), Ok(codeword));
        }
        
        {
            let code = GuavaCode23_21;
            let randvec = BinVector::from_bools(&[true, false, true, true, false, true, true, true, true, false, false, false, false, false, false, false, true, true, true, false, false, false, true]);
            let codeword = BinVector::from_bools(&[true, false, true, true, false, true, true, true, true, false, false, false, false, false, false, false, true, true, true, false, false, false, false]);
            assert_eq!(code.decode_to_code(&randvec), Ok(codeword));
        }
        
        {
            let code = GuavaCode23_21;
            let randvec = BinVector::from_bools(&[false, false, true, true, true, true, true, false, true, true, true, false, true, false, false, false, false, false, true, true, false, true, false]);
            let codeword = BinVector::from_bools(&[false, false, true, true, true, true, true, false, true, true, true, false, true, false, false, false, false, false, true, true, false, true, false]);
            assert_eq!(code.decode_to_code(&randvec), Ok(codeword));
        }
        
        {
            let code = GuavaCode23_21;
            let randvec = BinVector::from_bools(&[true, false, true, true, true, true, false, false, true, false, false, true, true, false, true, false, false, true, false, true, true, true, false]);
            let codeword = BinVector::from_bools(&[false, false, true, true, true, true, false, false, true, false, false, true, true, false, true, false, false, true, false, true, true, true, false]);
            assert_eq!(code.decode_to_code(&randvec), Ok(codeword));
        }
        
        {
            let code = GuavaCode23_21;
            let randvec = BinVector::from_bools(&[true, true, true, true, false, true, false, false, true, false, true, true, false, false, false, true, true, true, true, true, false, false, false]);
            let codeword = BinVector::from_bools(&[false, true, true, true, false, true, false, false, true, false, true, true, false, false, false, true, true, true, true, true, false, false, false]);
            assert_eq!(code.decode_to_code(&randvec), Ok(codeword));
        }
        
        {
            let code = GuavaCode23_21;
            let randvec = BinVector::from_bools(&[false, false, true, true, false, false, true, false, false, true, true, false, true, true, false, false, true, false, true, true, false, true, false]);
            let codeword = BinVector::from_bools(&[true, false, true, true, false, false, true, false, false, true, true, false, true, true, false, false, true, false, true, true, false, true, false]);
            assert_eq!(code.decode_to_code(&randvec), Ok(codeword));
        }
        
        {
            let code = GuavaCode23_21;
            let randvec = BinVector::from_bools(&[true, true, true, true, false, false, true, false, true, true, true, false, true, false, true, false, false, true, false, false, false, false, true]);
            let codeword = BinVector::from_bools(&[false, true, true, true, false, false, true, false, true, true, true, false, true, false, true, false, false, true, false, false, false, false, false]);
            assert_eq!(code.decode_to_code(&randvec), Ok(codeword));
        }
        
    }

    #[test]
    fn test_generator_representation() {
        init();
        let generator_matrix = unsafe { GENERATOR_MATRIX.as_ref().unwrap() };
        let first_row = generator_matrix.get_window(0, 0, 1, generator_matrix.ncols());
        let vector = BinVector::from_bools(&[ true, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, true, false ]);
        assert_eq!(vector, first_row.as_vector());
    }

}