4 /* nettle, low-level cryptographics library
6 * Copyright (C) 2013 Niels Möller
8 * The nettle library is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU Lesser General Public License as published by
10 * the Free Software Foundation; either version 2.1 of the License, or (at your
11 * option) any later version.
13 * The nettle library is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
16 * License for more details.
18 * You should have received a copy of the GNU Lesser General Public License
19 * along with the nettle library; see the file COPYING.LIB. If not, write to
20 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
35 _umac_nh_n (uint64_t *out, unsigned n, const uint32_t *key,
36 unsigned length, const uint8_t *msg)
39 assert (length <= 1024);
40 assert (length % 32 == 0);
42 memset(out, 0, n*sizeof(*out));
44 for (;length > 0; length -= 32, msg += 32, key += 8)
46 uint32_t a0, a1, b0, b1;
48 a0 = LE_READ_UINT32 (msg);
49 a1 = LE_READ_UINT32 (msg + 4);
50 b0 = LE_READ_UINT32 (msg + 16);
51 b1 = LE_READ_UINT32 (msg + 20);
52 for (i = 0; i < n; i++)
53 out[i] += (uint64_t) (a0 + key[0+4*i]) * (b0 + key[4+4*i])
54 + (uint64_t) (a1 + key[1+4*i]) * (b1 + key[5+4*i]);
55 a0 = LE_READ_UINT32 (msg + 8);
56 a1 = LE_READ_UINT32 (msg + 12);
57 b0 = LE_READ_UINT32 (msg + 24);
58 b1 = LE_READ_UINT32 (msg + 28);
59 for (i = 0; i < n; i++)
60 out[i] += (uint64_t) (a0 + key[2+4*i]) * (b0 + key[6+4*i])
61 + (uint64_t) (a1 + key[3+4*i]) * (b1 + key[7+4*i]);