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/*
* Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
* Copyright 2015 Cryptography Research, Inc.
*
* Licensed under the OpenSSL license (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 __DECAF_COMMON_H__
# define __DECAF_COMMON_H__ 1
# include <openssl/e_os2.h>
#ifdef __cplusplus
extern "C" {
#endif
/*
* Internal word types. Somewhat tricky. This could be decided separately per
* platform. However, the structs do need to be all the same size and
* alignment on a given platform to support dynamic linking, since even if you
* header was built with eg arch_neon, you might end up linking a library built
* with arch_arm32.
*/
# ifndef DECAF_WORD_BITS
# if (defined(__ILP64__) || defined(__amd64__) || defined(__x86_64__) || (((__UINT_FAST32_MAX__)>>30)>>30))
# define DECAF_WORD_BITS 64 /**< The number of bits in a word */
# else
# define DECAF_WORD_BITS 32 /**< The number of bits in a word */
# endif
# endif
# if DECAF_WORD_BITS == 64
typedef uint64_t decaf_word_t; /**< Word size for internal computations */
typedef int64_t decaf_sword_t; /**< Signed word size for internal computations */
typedef uint64_t decaf_bool_t; /**< "Boolean" type, will be set to all-zero or all-one (i.e. -1u) */
typedef __uint128_t decaf_dword_t; /**< Double-word size for internal computations */
typedef __int128_t decaf_dsword_t; /**< Signed double-word size for internal computations */
# elif DECAF_WORD_BITS == 32 /**< The number of bits in a word */
typedef uint32_t decaf_word_t; /**< Word size for internal computations */
typedef int32_t decaf_sword_t; /**< Signed word size for internal computations */
typedef uint32_t decaf_bool_t; /**< "Boolean" type, will be set to all-zero or all-one (i.e. -1u) */
typedef uint64_t decaf_dword_t; /**< Double-word size for internal computations */
typedef int64_t decaf_dsword_t; /**< Signed double-word size for internal computations */
# else
# error "Only supporting DECAF_WORD_BITS = 32 or 64 for now"
# endif
/** DECAF_TRUE = -1 so that DECAF_TRUE & x = x */
static const decaf_bool_t DECAF_TRUE = -(decaf_bool_t) 1;
/** DECAF_FALSE = 0 so that DECAF_FALSE & x = 0 */
static const decaf_bool_t DECAF_FALSE = 0;
/** Another boolean type used to indicate success or failure. */
typedef enum {
DECAF_SUCCESS = -1, /**< The operation succeeded. */
DECAF_FAILURE = 0 /**< The operation failed. */
} decaf_error_t;
/** Return success if x is true */
static ossl_inline decaf_error_t decaf_succeed_if(decaf_bool_t x)
{
return (decaf_error_t) x;
}
/** Return DECAF_TRUE iff x == DECAF_SUCCESS */
static ossl_inline decaf_bool_t decaf_successful(decaf_error_t e)
{
decaf_dword_t w = ((decaf_word_t) e) ^ ((decaf_word_t) DECAF_SUCCESS);
return (w - 1) >> DECAF_WORD_BITS;
}
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* __DECAF_COMMON_H__ */
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