1 /* camellia128-set-encrypt-key.c
3 Key setup for the camellia block cipher.
5 Copyright (C) 2006,2007 NTT
6 (Nippon Telegraph and Telephone Corporation).
8 Copyright (C) 2010, 2013 Niels Möller
10 This file is part of GNU Nettle.
12 GNU Nettle is free software: you can redistribute it and/or
13 modify it under the terms of either:
15 * the GNU Lesser General Public License as published by the Free
16 Software Foundation; either version 3 of the License, or (at your
17 option) any later version.
21 * the GNU General Public License as published by the Free
22 Software Foundation; either version 2 of the License, or (at your
23 option) any later version.
25 or both in parallel, as here.
27 GNU Nettle is distributed in the hope that it will be useful,
28 but WITHOUT ANY WARRANTY; without even the implied warranty of
29 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
30 General Public License for more details.
32 You should have received copies of the GNU General Public License and
33 the GNU Lesser General Public License along with this program. If
34 not, see http://www.gnu.org/licenses/.
38 * Algorithm Specification
39 * http://info.isl.ntt.co.jp/crypt/eng/camellia/specifications.html
42 /* Based on camellia.c ver 1.2.0, see
43 http://info.isl.ntt.co.jp/crypt/eng/camellia/dl/camellia-LGPL-1.2.0.tar.gz.
52 #include "camellia-internal.h"
57 camellia128_set_encrypt_key (struct camellia128_ctx *ctx,
62 uint64_t subkey[_CAMELLIA128_NKEYS + 2];
65 k0 = READ_UINT64(key);
66 k1 = READ_UINT64(key + 8);
69 * generate KL dependent subkeys
71 subkey[0] = k0; subkey[1] = k1;
73 subkey[4] = k0; subkey[5] = k1;
75 subkey[10] = k0; subkey[11] = k1;
79 subkey[16] = k0; subkey[17] = k1;
81 subkey[18] = k0; subkey[19] = k1;
83 subkey[22] = k0; subkey[23] = k1;
85 /* generate KA. D1 is k0, d2 is k1. */
86 /* FIXME: Make notation match the spec better. */
87 /* For the 128-bit case, KR = 0, the construction of KA reduces to:
94 D2 = D2 ^ F(D1, Sigma3);
95 D1 = D1 ^ F(D2, Sigma4);
98 k0 = subkey[0]; w = subkey[1];
99 CAMELLIA_F(k0, SIGMA1, k1);
101 CAMELLIA_F(w, SIGMA2, k0);
102 CAMELLIA_F(k0, SIGMA3, w);
104 CAMELLIA_F(k1, SIGMA4, w);
107 /* generate KA dependent subkeys */
108 subkey[2] = k0; subkey[3] = k1;
110 subkey[6] = k0; subkey[7] = k1;
112 subkey[8] = k0; subkey[9] = k1;
116 subkey[14] = k0; subkey[15] = k1;
118 subkey[20] = k0; subkey[21] = k1;
120 subkey[24] = k0; subkey[25] = k1;
122 /* Common final processing */
123 _camellia_absorb (_CAMELLIA128_NKEYS, ctx->keys, subkey);