]>
git.ipfire.org Git - thirdparty/openssl.git/blob - crypto/ec/curve448/word.h
2 * Copyright 2017-2021 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
13 #ifndef OSSL_CRYPTO_EC_CURVE448_WORD_H
14 # define OSSL_CRYPTO_EC_CURVE448_WORD_H
19 # include <openssl/e_os2.h>
20 # include "curve448utils.h"
23 # include "arch_64/arch_intrinsics.h"
25 # include "arch_32/arch_intrinsics.h"
28 # if (ARCH_WORD_BITS == 64)
29 typedef uint64_t word_t
, mask_t
;
30 typedef uint128_t dword_t
;
31 typedef int32_t hsword_t
;
32 typedef int64_t sword_t
;
33 typedef int128_t dsword_t
;
34 # elif (ARCH_WORD_BITS == 32)
35 typedef uint32_t word_t
, mask_t
;
36 typedef uint64_t dword_t
;
37 typedef int16_t hsword_t
;
38 typedef int32_t sword_t
;
39 typedef int64_t dsword_t
;
41 # error "For now, we only support 32- and 64-bit architectures."
45 * Scalar limbs are keyed off of the API word size instead of the arch word
48 # if C448_WORD_BITS == 64
49 # define SC_LIMB(x) (x)
50 # elif C448_WORD_BITS == 32
51 # define SC_LIMB(x) ((uint32_t)(x)),((x) >> 32)
53 # error "For now we only support 32- and 64-bit architectures."
57 * The plan on booleans: The external interface uses c448_bool_t, but this
58 * might be a different size than our particular arch's word_t (and thus
59 * mask_t). Also, the caller isn't guaranteed to pass it as nonzero. So
60 * bool_to_mask converts word sizes and checks nonzero. On the flip side,
61 * mask_t is always -1 or 0, but it might be a different size than
62 * c448_bool_t. On the third hand, we have success vs boolean types, but
63 * that's handled in common.h: it converts between c448_bool_t and
66 static ossl_inline c448_bool_t
mask_to_bool(mask_t m
)
68 return (c448_sword_t
)(sword_t
)m
;
71 static ossl_inline mask_t
bool_to_mask(c448_bool_t m
)
73 /* On most arches this will be optimized to a simple cast. */
76 unsigned int limit
= sizeof(c448_bool_t
) / sizeof(mask_t
);
80 for (i
= 0; i
< limit
; i
++)
81 ret
|= ~word_is_zero(m
>> (i
* 8 * sizeof(word_t
)));
86 #endif /* OSSL_CRYPTO_EC_CURVE448_WORD_H */