MPCGuard/functionality.py at master · FudanMPL/MPCGuard · GitHub

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
import numpy as np
import random
from tools_and_global_parameters import *

from load_data import adversary_views_in_ideal_world, input_shares_in_ideal_world, output_shares_in_ideal_world

def generate_element_in_ring():
    return np.random.randint(-2**63, 2**63, dtype=np.int64)


def generate_ass_shares(secret):
    secret = np.array(secret, dtype=np.int64)
    # Generate random shares of a secret
    shares = []
    for i in range(my_config['party_number'] - 1):
        random_share = generate_element_in_ring()
        shares.append(random_share)
    shares.append(secret - sum(shares))
    return shares


def F_ass_linear(secret, a=1, b=2, c=3):
    shares_x = generate_ass_shares(secret)

    # Convert constants and reconstruct x and y from shares using numpy arrays
    a = np.array(a, dtype=np.int64)
    b = np.array(b, dtype=np.int64)
    c = np.array(c, dtype=np.int64)
    x = sum(np.array(shares_x, dtype=np.int64))

    shares_y = [1 for i in range(len(shares_x))]
    y = sum(np.array(shares_y, dtype=np.int64))

    # Compute z = a*x + b*y + c
    z = a * x + b * y + c
    shares_z = generate_ass_shares(z)
    ass_functionality_record(secret, shares_x, shares_z)


def F_ass_mul(secret):
    shares_x = generate_ass_shares(secret)
    # Reconstruct x and y using numpy arrays
    x = sum(np.array(shares_x, dtype=np.int64))

    shares_y = [1 for i in range(len(shares_x))]
    y = sum(np.array(shares_y, dtype=np.int64))

    # Compute z = x * y
    z = x * y

    shares_z = generate_ass_shares(z)
    ass_functionality_record(secret, shares_x, shares_z)


def F_ass_ltz(secret):
    shares_x = generate_ass_shares(secret)
    # Reconstruct x
    x = sum(np.array(shares_x, dtype=np.int64))

    # Compute z = x < 0
    z = int(x < 0)  # Convert boolean to int

    shares_z = generate_ass_shares(z)
    ass_functionality_record(secret, shares_x, shares_z)


def F_ass_eq(secret):
    shares_x = generate_ass_shares(secret)
    # Reconstruct x
    x = sum(np.array(shares_x, dtype=np.int64))

    # Compute z = x < 0
    z = int(x == 0)  # Convert boolean to int

    shares_z = generate_ass_shares(z)
    ass_functionality_record(secret, shares_x, shares_z)


def F_ass_truncpr(secret, f=10):
    shares_x = generate_ass_shares(secret)
    # Reconstruct x
    x = sum(np.array(shares_x, dtype=np.int64))

    # Compute x_f and x^f
    x_f = x & ((1 << f) - 1)
    x_to_f = x >> f

    rand_numb = np.abs(np.random.randint(0, 2**f, dtype=np.int64))

    # Randomly sample z based on x_f
    if rand_numb < abs(x_f):
        z = x_to_f + 1
    else:
        z = x_to_f

    shares_z = generate_ass_shares(z)
    ass_functionality_record(secret, shares_x, shares_z)


def F_ass_and(secret):
    shares_x = generate_ass_shares(secret)
    # Reconstruct x and y using numpy arrays
    x = sum(np.array(shares_x, dtype=np.int64))
    if shares_y is None:
        shares_y = [-1 for i in range(len(shares_x))]
    y = sum(np.array(shares_y, dtype=np.int64))
    z = x & y
    shares_z = generate_ass_shares(z)
    ass_functionality_record(secret, shares_x, shares_z)


def ass_functionality_record(secret, shares_x, shares_z):
    adversary_view = []
    for party in my_config['corrupted_party']:
        for j in range(4):
            adversary_view.append(generate_element_in_ring())
        adversary_view.append(shares_x[party])
        adversary_view.append(shares_z[party])
    adversary_views_in_ideal_world[secret].append(adversary_view)
    input_shares_in_ideal_world[secret].append(shares_x)
    output_shares_in_ideal_world[secret].append(shares_z)


def generate_rss_shares(secret):
    assert my_config['party_number'] == 3
    secret = np.array(secret, dtype=np.int64)
    # Generate random shares of a secret
    shares = []
    for i in range(my_config['party_number'] - 1):
        random_share = generate_element_in_ring()
        shares.append(random_share)
    shares.append(secret - sum(shares))
    return shares


def F_rss_linear(secret, a=1, b=2, c=3):
    shares_x = generate_rss_shares(secret)
    # Convert constants and reconstruct x and y from shares using numpy arrays
    a = np.array(a, dtype=np.int64)
    b = np.array(b, dtype=np.int64)
    c = np.array(c, dtype=np.int64)
    x = sum(np.array(shares_x, dtype=np.int64))

    shares_y = [1 for i in range(len(shares_x))]
    y = sum(np.array(shares_y, dtype=np.int64))

    # Compute z = a*x + b*y + c
    z = a * x + b * y + c

    shares_z = generate_rss_shares(z)
    rss_functionality_record(secret, shares_x, shares_z)


def F_rss_mul(secret):
    shares_x = generate_rss_shares(secret)
    # Reconstruct x and y using numpy arrays
    x = sum(np.array(shares_x, dtype=np.int64))

    shares_y = [1 for i in range(len(shares_x))]
    y = sum(np.array(shares_y, dtype=np.int64))

    # Compute z = x * y
    z = x * y

    shares_z = generate_rss_shares(z)
    rss_functionality_record(secret, shares_x, shares_z)


def F_rss_ltz(secret):
    shares_x = generate_rss_shares(secret)
    # Reconstruct x
    x = sum(np.array(shares_x, dtype=np.int64))

    # Compute z = x < 0
    z = int(x < 0)  # Convert boolean to int

    shares_z = generate_rss_shares(z)
    rss_functionality_record(secret, shares_x, shares_z)


def F_rss_eq(secret):
    shares_x = generate_rss_shares(secret)
    # Reconstruct x
    x = sum(np.array(shares_x, dtype=np.int64))

    # Compute z = x < 0
    z = int(x == 0)  # Convert boolean to int

    shares_z = generate_rss_shares(z)
    rss_functionality_record(secret, shares_x, shares_z)


def F_rss_truncpr(secret, f=10):
    shares_x = generate_rss_shares(secret)
    # Reconstruct x
    x = sum(np.array(shares_x, dtype=np.int64))

    # Compute x_f and x^f
    x_f = x & ((1 << f) - 1)
    x_to_f = x >> f

    rand_numb = np.abs(np.random.randint(0, 2**f, dtype=np.int64))

    # Randomly sample z based on x_f
    if rand_numb < abs(x_f):
        z = x_to_f + 1
    else:
        z = x_to_f

    shares_z = generate_rss_shares(z)
    rss_functionality_record(secret, shares_x, shares_z)


def F_rss_and(secret):
    shares_x = generate_rss_shares(secret)
    # Reconstruct x and y using numpy arrays
    x = sum(np.array(shares_x, dtype=np.int64))
    if shares_y is None:
        shares_y = [-1 for i in range(len(shares_x))]
    y = sum(np.array(shares_y, dtype=np.int64))
    z = x & y
    shares_z = generate_rss_shares(z)
    rss_functionality_record(secret, shares_x, shares_z)


def rss_functionality_record(secret, shares_x, shares_z):
    adversary_view = []
    for party in my_config['corrupted_party']:
        # for j in range(1):
        #     adversary_view.append(generate_element_in_ring())
        adversary_view.append(shares_x[(party-1) % 3])
        adversary_view.append(shares_x[party])
        adversary_view.append(shares_z[(party-1) % 3])
        adversary_view.append(shares_z[party])
    adversary_views_in_ideal_world[secret].append(adversary_view)
    input_shares_in_ideal_world[secret].append(shares_x)
    output_shares_in_ideal_world[secret].append(shares_z)