summaryrefslogtreecommitdiffstats
path: root/security/nss/lib/freebl/gcm-arm32-neon.c
blob: be0424770157ab0b16ac57384d42434db787bfa8 (plain)
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
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifdef FREEBL_NO_DEPEND
#include "stubs.h"
#endif
#include "blapii.h"
#include "blapit.h"
#include "gcm.h"
#include "secerr.h"
#include "prtypes.h"

#if defined(IS_LITTLE_ENDIAN)

#include <arm_neon.h>

SECStatus
gcm_HashWrite_hw(gcmHashContext *ghash, unsigned char *outbuf)
{
    vst1_u8(outbuf, vrev64_u8(vcreate_u8(ghash->x_high)));
    vst1_u8(outbuf + 8, vrev64_u8(vcreate_u8(ghash->x_low)));
    return SECSuccess;
}

/* Carry-less multiplication. a * b = ret. */
static inline uint8x16_t
clmul(const uint8x8_t a, const uint8x8_t b)
{
    uint8x16_t d, e, f, g, h, i, j, k, l, m, n;
    uint8x8_t t_high, t_low;
    uint8x16_t t0, t1, t2, t3;
    const uint8x8_t k16 = vcreate_u8(0xffff);
    const uint8x8_t k32 = vcreate_u8(0xffffffff);
    const uint8x8_t k48 = vcreate_u8(0xffffffffffff);

    // D = A * B
    d = vreinterpretq_u8_p16(vmull_p8(vreinterpret_p8_u8(a),
                                      vreinterpret_p8_u8(b)));
    // E = A * B1
    e = vreinterpretq_u8_p16(vmull_p8(vreinterpret_p8_u8(a),
                                      vreinterpret_p8_u8(vext_u8(b, b, 1))));
    // F = A1 * B
    f = vreinterpretq_u8_p16(vmull_p8(vreinterpret_p8_u8(vext_u8(a, a, 1)),
                                      vreinterpret_p8_u8(b)));
    // G = A * B2
    g = vreinterpretq_u8_p16(vmull_p8(vreinterpret_p8_u8(a),
                                      vreinterpret_p8_u8(vext_u8(b, b, 2))));
    // H = A2 * B
    h = vreinterpretq_u8_p16(vmull_p8(vreinterpret_p8_u8(vext_u8(a, a, 2)),
                                      vreinterpret_p8_u8(b)));
    // I = A * B3
    i = vreinterpretq_u8_p16(vmull_p8(vreinterpret_p8_u8(a),
                                      vreinterpret_p8_u8(vext_u8(b, b, 3))));
    // J = A3 * B
    j = vreinterpretq_u8_p16(vmull_p8(vreinterpret_p8_u8(vext_u8(a, a, 3)),
                                      vreinterpret_p8_u8(b)));
    // K = A * B4
    k = vreinterpretq_u8_p16(vmull_p8(vreinterpret_p8_u8(a),
                                      vreinterpret_p8_u8(vext_u8(b, b, 4))));
    // L = E + F
    l = veorq_u8(e, f);
    // M = G + H
    m = veorq_u8(g, h);
    // N = I + J
    n = veorq_u8(i, j);

    // t0 = (L) (P0 + P1) << 8
    t_high = vget_high_u8(l);
    t_low = vget_low_u8(l);
    t_low = veor_u8(t_low, t_high);
    t_high = vand_u8(t_high, k48);
    t_low = veor_u8(t_low, t_high);
    t0 = vcombine_u8(t_low, t_high);
    t0 = vextq_u8(t0, t0, 15);

    // t1 = (M) (P2 + P3) << 16
    t_high = vget_high_u8(m);
    t_low = vget_low_u8(m);
    t_low = veor_u8(t_low, t_high);
    t_high = vand_u8(t_high, k32);
    t_low = veor_u8(t_low, t_high);
    t1 = vcombine_u8(t_low, t_high);
    t1 = vextq_u8(t1, t1, 14);

    // t2 = (N) (P4 + P5) << 24
    t_high = vget_high_u8(n);
    t_low = vget_low_u8(n);
    t_low = veor_u8(t_low, t_high);
    t_high = vand_u8(t_high, k16);
    t_low = veor_u8(t_low, t_high);
    t2 = vcombine_u8(t_low, t_high);
    t2 = vextq_u8(t2, t2, 13);

    // t3 = (K) (P6 + P7) << 32
    t_high = vget_high_u8(k);
    t_low = vget_low_u8(k);
    t_low = veor_u8(t_low, t_high);
    t_high = vdup_n_u8(0);
    t3 = vcombine_u8(t_low, t_high);
    t3 = vextq_u8(t3, t3, 12);

    t0 = veorq_u8(t0, t1);
    t2 = veorq_u8(t2, t3);
    return veorq_u8(veorq_u8(d, t0), t2);
}

SECStatus
gcm_HashMult_hw(gcmHashContext *ghash, const unsigned char *buf,
                unsigned int count)
{
    const uint8x8_t h_low = vcreate_u8(ghash->h_low);
    const uint8x8_t h_high = vcreate_u8(ghash->h_high);
    uint8x16_t ci;
    uint8x8_t ci_low;
    uint8x8_t ci_high;
    uint8x16_t z0, z2, z1a;
    uint8x16_t z_high, z_low;
    uint8x16_t t;
    int64x2_t t1, t2, t3;
    uint64x2_t z_low_l, z_low_r, z_high_l, z_high_r;
    size_t i;

    ci = vcombine_u8(vcreate_u8(ghash->x_low), vcreate_u8(ghash->x_high));

    for (i = 0; i < count; i++, buf += 16) {
        ci = veorq_u8(ci, vcombine_u8(vrev64_u8(vld1_u8(buf + 8)),
                                      vrev64_u8(vld1_u8(buf))));
        ci_high = vget_high_u8(ci);
        ci_low = vget_low_u8(ci);

        /* Do binary mult ghash->X = C * ghash->H (Karatsuba). */
        z0 = clmul(ci_low, h_low);
        z2 = clmul(ci_high, h_high);
        z1a = clmul(veor_u8(ci_high, ci_low), veor_u8(h_high, h_low));
        z1a = veorq_u8(z0, z1a);
        z1a = veorq_u8(z2, z1a);
        z_high = vcombine_u8(veor_u8(vget_low_u8(z2), vget_high_u8(z1a)),
                             vget_high_u8(z2));
        z_low = vcombine_u8(vget_low_u8(z0),
                            veor_u8(vget_high_u8(z0), vget_low_u8(z1a)));

        /* Shift one (multiply by x) as gcm spec is stupid. */
        z_low_l = vshlq_n_u64(vreinterpretq_u64_u8(z_low), 1);
        z_low_r = vshrq_n_u64(vreinterpretq_u64_u8(z_low), 63);
        z_high_l = vshlq_n_u64(vreinterpretq_u64_u8(z_high), 1);
        z_high_r = vshrq_n_u64(vreinterpretq_u64_u8(z_high), 63);
        z_low = vreinterpretq_u8_u64(
            vcombine_u64(vget_low_u64(z_low_l),
                         vorr_u64(vget_high_u64(z_low_l),
                                  vget_low_u64(z_low_r))));
        z_high = vreinterpretq_u8_u64(
            vcombine_u64(vorr_u64(vget_low_u64(z_high_l),
                                  vget_high_u64(z_low_r)),
                         vorr_u64(vget_high_u64(z_high_l),
                                  vget_low_u64(z_high_r))));

        /* Reduce */
        t1 = vshlq_n_s64(vreinterpretq_s64_u8(z_low), 57);
        t2 = vshlq_n_s64(vreinterpretq_s64_u8(z_low), 62);
        t3 = vshlq_n_s64(vreinterpretq_s64_u8(z_low), 63);
        t = vreinterpretq_u8_s64(veorq_s64(t1, veorq_s64(t2, t3)));

        z_low = vcombine_u8(vget_low_u8(z_low),
                            veor_u8(vget_high_u8(z_low), vget_low_u8(t)));
        z_high = vcombine_u8(veor_u8(vget_low_u8(z_high), vget_high_u8(t)),
                             vget_high_u8(z_high));

        t = vreinterpretq_u8_u64(vshrq_n_u64(vreinterpretq_u64_u8(z_low), 1));
        z_high = veorq_u8(z_high, z_low);
        z_low = veorq_u8(z_low, t);
        t = vreinterpretq_u8_u64(vshrq_n_u64(vreinterpretq_u64_u8(t), 6));
        z_low = vreinterpretq_u8_u64(
            vshrq_n_u64(vreinterpretq_u64_u8(z_low), 1));
        z_low = veorq_u8(z_low, z_high);
        ci = veorq_u8(z_low, t);
    }

    vst1_u8((uint8_t *)&ghash->x_high, vget_high_u8(ci));
    vst1_u8((uint8_t *)&ghash->x_low, vget_low_u8(ci));
    return SECSuccess;
}

SECStatus
gcm_HashInit_hw(gcmHashContext *ghash)
{
    ghash->ghash_mul = gcm_HashMult_hw;
    ghash->x_low = 0;
    ghash->x_high = 0;
    ghash->hw = PR_TRUE;
    return SECSuccess;
}

SECStatus
gcm_HashZeroX_hw(gcmHashContext *ghash)
{
    ghash->x_low = 0;
    ghash->x_high = 0;
    return SECSuccess;
}

#endif /* IS_LITTLE_ENDIAN */