2 * Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
3 * Copyright 2014 Cryptography Research, Inc.
5 * Licensed under the Apache License 2.0 (the "License"). You may not use
6 * this file except in compliance with the License. You can obtain a copy
7 * in the file LICENSE in the source distribution or at
8 * https://www.openssl.org/source/license.html
10 * Originally written by Mike Hamburg
14 # define HEADER_WORD_H
19 # include <openssl/e_os2.h>
20 # include "arch_intrinsics.h"
21 # include "curve448utils.h"
23 # if (ARCH_WORD_BITS == 64)
24 typedef uint64_t word_t, mask_t;
25 typedef __uint128_t dword_t;
26 typedef int32_t hsword_t;
27 typedef int64_t sword_t;
28 typedef __int128_t dsword_t;
29 # elif (ARCH_WORD_BITS == 32)
30 typedef uint32_t word_t, mask_t;
31 typedef uint64_t dword_t;
32 typedef int16_t hsword_t;
33 typedef int32_t sword_t;
34 typedef int64_t dsword_t;
36 # error "For now, we only support 32- and 64-bit architectures."
40 * Scalar limbs are keyed off of the API word size instead of the arch word
43 # if C448_WORD_BITS == 64
44 # define SC_LIMB(x) (x)
45 # elif C448_WORD_BITS == 32
46 # define SC_LIMB(x) ((uint32_t)(x)),((x) >> 32)
48 # error "For now we only support 32- and 64-bit architectures."
52 * The plan on booleans: The external interface uses c448_bool_t, but this
53 * might be a different size than our particular arch's word_t (and thus
54 * mask_t). Also, the caller isn't guaranteed to pass it as nonzero. So
55 * bool_to_mask converts word sizes and checks nonzero. On the flip side,
56 * mask_t is always -1 or 0, but it might be a different size than
57 * c448_bool_t. On the third hand, we have success vs boolean types, but
58 * that's handled in common.h: it converts between c448_bool_t and
61 static ossl_inline c448_bool_t mask_to_bool(mask_t m)
63 return (c448_sword_t)(sword_t)m;
66 static ossl_inline mask_t bool_to_mask(c448_bool_t m)
68 /* On most arches this will be optimized to a simple cast. */
71 unsigned int limit = sizeof(c448_bool_t) / sizeof(mask_t);
75 for (i = 0; i < limit; i++)
76 ret |= ~word_is_zero(m >> (i * 8 * sizeof(word_t)));
81 #endif /* HEADER_WORD_H */