205fd63881
Reviewed-by: Bernd Edlinger <bernd.edlinger@hotmail.de> (Merged from https://github.com/openssl/openssl/pull/5105)
82 lines
3.1 KiB
C
82 lines
3.1 KiB
C
/*
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* Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
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* Copyright 2015 Cryptography Research, Inc.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*
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* Originally written by Mike Hamburg
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*/
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#ifndef __DECAF_COMMON_H__
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# define __DECAF_COMMON_H__ 1
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# include <openssl/e_os2.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Internal word types. Somewhat tricky. This could be decided separately per
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* platform. However, the structs do need to be all the same size and
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* alignment on a given platform to support dynamic linking, since even if you
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* header was built with eg arch_neon, you might end up linking a library built
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* with arch_arm32.
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*/
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# ifndef DECAF_WORD_BITS
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# if (defined(__ILP64__) || defined(__amd64__) || defined(__x86_64__) || (((__UINT_FAST32_MAX__)>>30)>>30))
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# define DECAF_WORD_BITS 64 /**< The number of bits in a word */
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# else
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# define DECAF_WORD_BITS 32 /**< The number of bits in a word */
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# endif
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# endif
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# if DECAF_WORD_BITS == 64
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typedef uint64_t decaf_word_t; /**< Word size for internal computations */
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typedef int64_t decaf_sword_t; /**< Signed word size for internal computations */
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typedef uint64_t decaf_bool_t; /**< "Boolean" type, will be set to all-zero or all-one (i.e. -1u) */
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typedef __uint128_t decaf_dword_t; /**< Double-word size for internal computations */
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typedef __int128_t decaf_dsword_t; /**< Signed double-word size for internal computations */
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# elif DECAF_WORD_BITS == 32 /**< The number of bits in a word */
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typedef uint32_t decaf_word_t; /**< Word size for internal computations */
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typedef int32_t decaf_sword_t; /**< Signed word size for internal computations */
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typedef uint32_t decaf_bool_t; /**< "Boolean" type, will be set to all-zero or all-one (i.e. -1u) */
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typedef uint64_t decaf_dword_t; /**< Double-word size for internal computations */
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typedef int64_t decaf_dsword_t; /**< Signed double-word size for internal computations */
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# else
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# error "Only supporting DECAF_WORD_BITS = 32 or 64 for now"
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# endif
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/** DECAF_TRUE = -1 so that DECAF_TRUE & x = x */
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static const decaf_bool_t DECAF_TRUE = -(decaf_bool_t) 1;
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/** DECAF_FALSE = 0 so that DECAF_FALSE & x = 0 */
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static const decaf_bool_t DECAF_FALSE = 0;
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/** Another boolean type used to indicate success or failure. */
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typedef enum {
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DECAF_SUCCESS = -1, /**< The operation succeeded. */
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DECAF_FAILURE = 0 /**< The operation failed. */
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} decaf_error_t;
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/** Return success if x is true */
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static ossl_inline decaf_error_t decaf_succeed_if(decaf_bool_t x)
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{
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return (decaf_error_t) x;
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}
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/** Return DECAF_TRUE iff x == DECAF_SUCCESS */
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static ossl_inline decaf_bool_t decaf_successful(decaf_error_t e)
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{
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decaf_dword_t w = ((decaf_word_t) e) ^ ((decaf_word_t) DECAF_SUCCESS);
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return (w - 1) >> DECAF_WORD_BITS;
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}
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* __DECAF_COMMON_H__ */
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