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/*
* Copyright 2017-2021 The OpenSSL Project Authors. All Rights Reserved.
* Copyright 2014 Cryptography Research, Inc.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*
* Originally written by Mike Hamburg
*/
#ifndef OSSL_CRYPTO_EC_CURVE448_WORD_H
# define OSSL_CRYPTO_EC_CURVE448_WORD_H
# include <string.h>
# include <assert.h>
# include <stdlib.h>
# include <openssl/e_os2.h>
# include "curve448utils.h"
# ifdef INT128_MAX
# include "arch_64/arch_intrinsics.h"
# else
# include "arch_32/arch_intrinsics.h"
# endif
# if (ARCH_WORD_BITS == 64)
typedef uint64_t word_t, mask_t;
typedef uint128_t dword_t;
typedef int32_t hsword_t;
typedef int64_t sword_t;
typedef int128_t dsword_t;
# elif (ARCH_WORD_BITS == 32)
typedef uint32_t word_t, mask_t;
typedef uint64_t dword_t;
typedef int16_t hsword_t;
typedef int32_t sword_t;
typedef int64_t dsword_t;
# else
# error "For now, we only support 32- and 64-bit architectures."
# endif
/*
* Scalar limbs are keyed off of the API word size instead of the arch word
* size.
*/
# if C448_WORD_BITS == 64
# define SC_LIMB(x) (x)
# elif C448_WORD_BITS == 32
# define SC_LIMB(x) ((uint32_t)(x)),((x) >> 32)
# else
# error "For now we only support 32- and 64-bit architectures."
# endif
/*
* The plan on booleans: The external interface uses c448_bool_t, but this
* might be a different size than our particular arch's word_t (and thus
* mask_t). Also, the caller isn't guaranteed to pass it as nonzero. So
* bool_to_mask converts word sizes and checks nonzero. On the flip side,
* mask_t is always -1 or 0, but it might be a different size than
* c448_bool_t. On the third hand, we have success vs boolean types, but
* that's handled in common.h: it converts between c448_bool_t and
* c448_error_t.
*/
static ossl_inline c448_bool_t mask_to_bool(mask_t m)
{
return (c448_sword_t)(sword_t)m;
}
static ossl_inline mask_t bool_to_mask(c448_bool_t m)
{
/* On most arches this will be optimized to a simple cast. */
mask_t ret = 0;
unsigned int i;
unsigned int limit = sizeof(c448_bool_t) / sizeof(mask_t);
if (limit < 1)
limit = 1;
for (i = 0; i < limit; i++)
ret |= ~word_is_zero(m >> (i * 8 * sizeof(word_t)));
return ret;
}
#endif /* OSSL_CRYPTO_EC_CURVE448_WORD_H */
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