6 * Copyright (c) 2015 Cryptography Research, Inc. \n
7 * Released under the MIT License. See LICENSE.txt for license information.
9 * @brief Common utility headers for Decaf library.
12 #ifndef __DECAF_COMMON_H__
13 #define __DECAF_COMMON_H__ 1
16 #include <sys/types.h>
17 #include <openssl/e_os2.h>
24 #if defined(DOXYGEN) && !defined(__attribute__)
25 #define __attribute__((x))
27 #define DECAF_NOINLINE __attribute__((noinline))
28 #define DECAF_NONNULL __attribute__((nonnull))
31 /* Internal word types.
33 * Somewhat tricky. This could be decided separately per platform. However,
34 * the structs do need to be all the same size and alignment on a given
35 * platform to support dynamic linking, since even if you header was built
36 * with eg arch_neon, you might end up linking a library built with arch_arm32.
38 #ifndef DECAF_WORD_BITS
39 #if (defined(__ILP64__) || defined(__amd64__) || defined(__x86_64__) || (((__UINT_FAST32_MAX__)>>30)>>30))
40 #define DECAF_WORD_BITS 64 /**< The number of bits in a word */
42 #define DECAF_WORD_BITS 32 /**< The number of bits in a word */
46 #if DECAF_WORD_BITS == 64
47 typedef uint64_t decaf_word_t; /**< Word size for internal computations */
48 typedef int64_t decaf_sword_t; /**< Signed word size for internal computations */
49 typedef uint64_t decaf_bool_t; /**< "Boolean" type, will be set to all-zero or all-one (i.e. -1u) */
50 typedef __uint128_t decaf_dword_t; /**< Double-word size for internal computations */
51 typedef __int128_t decaf_dsword_t; /**< Signed double-word size for internal computations */
52 #elif DECAF_WORD_BITS == 32 /**< The number of bits in a word */
53 typedef uint32_t decaf_word_t; /**< Word size for internal computations */
54 typedef int32_t decaf_sword_t; /**< Signed word size for internal computations */
55 typedef uint32_t decaf_bool_t; /**< "Boolean" type, will be set to all-zero or all-one (i.e. -1u) */
56 typedef uint64_t decaf_dword_t; /**< Double-word size for internal computations */
57 typedef int64_t decaf_dsword_t; /**< Signed double-word size for internal computations */
59 #error "Only supporting DECAF_WORD_BITS = 32 or 64 for now"
62 /** DECAF_TRUE = -1 so that DECAF_TRUE & x = x */
63 static const decaf_bool_t DECAF_TRUE = -(decaf_bool_t)1;
65 /** DECAF_FALSE = 0 so that DECAF_FALSE & x = 0 */
66 static const decaf_bool_t DECAF_FALSE = 0;
68 /** Another boolean type used to indicate success or failure. */
70 DECAF_SUCCESS = -1, /**< The operation succeeded. */
71 DECAF_FAILURE = 0 /**< The operation failed. */
75 /** Return success if x is true */
76 static ossl_inline decaf_error_t
77 decaf_succeed_if(decaf_bool_t x) {
78 return (decaf_error_t)x;
81 /** Return DECAF_TRUE iff x == DECAF_SUCCESS */
82 static ossl_inline decaf_bool_t
83 decaf_successful(decaf_error_t e) {
84 decaf_dword_t w = ((decaf_word_t)e) ^ ((decaf_word_t)DECAF_SUCCESS);
85 return (w-1)>>DECAF_WORD_BITS;
92 #endif /* __DECAF_COMMON_H__ */