1 /* memxor-internal.h 2 3 Copyright (C) 2010, 2014 Niels Möller 4 5 This file is part of GNU Nettle. 6 7 GNU Nettle is free software: you can redistribute it and/or 8 modify it under the terms of either: 9 10 * the GNU Lesser General Public License as published by the Free 11 Software Foundation; either version 3 of the License, or (at your 12 option) any later version. 13 14 or 15 16 * the GNU General Public License as published by the Free 17 Software Foundation; either version 2 of the License, or (at your 18 option) any later version. 19 20 or both in parallel, as here. 21 22 GNU Nettle is distributed in the hope that it will be useful, 23 but WITHOUT ANY WARRANTY; without even the implied warranty of 24 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 25 General Public License for more details. 26 27 You should have received copies of the GNU General Public License and 28 the GNU Lesser General Public License along with this program. If 29 not, see http://www.gnu.org/licenses/. 30 */ 31 32 #ifndef NETTLE_MEMXOR_INTERNAL_H_INCLUDED 33 #define NETTLE_MEMXOR_INTERNAL_H_INCLUDED 34 35 #include "nettle-types.h" 36 37 /* The word_t type is intended to be the native word size. */ 38 #if defined(__x86_64__) || defined(__arch64__) 39 /* Including on M$ windows, where unsigned long is only 32 bits */ 40 typedef uint64_t word_t; 41 #else 42 typedef unsigned long int word_t; 43 #endif 44 45 #define ALIGN_OFFSET(p) ((uintptr_t) (p) % sizeof(word_t)) 46 47 #ifndef WORDS_BIGENDIAN 48 #define MERGE(w0, sh_1, w1, sh_2) \ 49 (((w0) >> (sh_1)) | ((w1) << (sh_2))) 50 #else 51 #define MERGE(w0, sh_1, w1, sh_2) \ 52 (((w0) << (sh_1)) | ((w1) >> (sh_2))) 53 #endif 54 55 #ifndef WORDS_BIGENDIAN 56 #define READ_PARTIAL(r,p,n) do { \ 57 word_t _rp_x; \ 58 unsigned _rp_i; \ 59 for (_rp_i = (n), _rp_x = (p)[--_rp_i]; _rp_i > 0;) \ 60 _rp_x = (_rp_x << CHAR_BIT) | (p)[--_rp_i]; \ 61 (r) = _rp_x; \ 62 } while (0) 63 #else 64 #define READ_PARTIAL(r,p,n) do { \ 65 word_t _rp_x; \ 66 unsigned _rp_i; \ 67 for (_rp_x = (p)[0], _rp_i = 1; _rp_i < (n); _rp_i++) \ 68 _rp_x = (_rp_x << CHAR_BIT) | (p)[_rp_i]; \ 69 (r) = _rp_x; \ 70 } while (0) 71 #endif 72 73 #endif /* NETTLE_MEMXOR_INTERNAL_H_INCLUDED */ 74