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>
22 /* Goldilocks' build flags default to hidden and stripping executables. */
24 #if defined(DOXYGEN) && !defined(__attribute__)
25 #define __attribute__((x))
27 #define DECAF_API_VIS __attribute__((visibility("default")))
28 #define DECAF_NOINLINE __attribute__((noinline))
29 #define DECAF_WARN_UNUSED __attribute__((warn_unused_result))
30 #define DECAF_NONNULL __attribute__((nonnull))
31 #define DECAF_INLINE inline __attribute__((always_inline,unused))
32 // Cribbed from libnotmuch
33 #if defined (__clang_major__) && __clang_major__ >= 3 \
34 || defined (__GNUC__) && __GNUC__ >= 5 \
35 || defined (__GNUC__) && __GNUC__ == 4 && __GNUC_MINOR__ >= 5
36 #define DECAF_DEPRECATED(msg) __attribute__ ((deprecated(msg)))
38 #define DECAF_DEPRECATED(msg) __attribute__ ((deprecated))
42 /* Internal word types.
44 * Somewhat tricky. This could be decided separately per platform. However,
45 * the structs do need to be all the same size and alignment on a given
46 * platform to support dynamic linking, since even if you header was built
47 * with eg arch_neon, you might end up linking a library built with arch_arm32.
49 #ifndef DECAF_WORD_BITS
50 #if (defined(__ILP64__) || defined(__amd64__) || defined(__x86_64__) || (((__UINT_FAST32_MAX__)>>30)>>30))
51 #define DECAF_WORD_BITS 64 /**< The number of bits in a word */
53 #define DECAF_WORD_BITS 32 /**< The number of bits in a word */
57 #if DECAF_WORD_BITS == 64
58 typedef uint64_t decaf_word_t; /**< Word size for internal computations */
59 typedef int64_t decaf_sword_t; /**< Signed word size for internal computations */
60 typedef uint64_t decaf_bool_t; /**< "Boolean" type, will be set to all-zero or all-one (i.e. -1u) */
61 typedef __uint128_t decaf_dword_t; /**< Double-word size for internal computations */
62 typedef __int128_t decaf_dsword_t; /**< Signed double-word size for internal computations */
63 #elif DECAF_WORD_BITS == 32 /**< The number of bits in a word */
64 typedef uint32_t decaf_word_t; /**< Word size for internal computations */
65 typedef int32_t decaf_sword_t; /**< Signed word size for internal computations */
66 typedef uint32_t decaf_bool_t; /**< "Boolean" type, will be set to all-zero or all-one (i.e. -1u) */
67 typedef uint64_t decaf_dword_t; /**< Double-word size for internal computations */
68 typedef int64_t decaf_dsword_t; /**< Signed double-word size for internal computations */
70 #error "Only supporting DECAF_WORD_BITS = 32 or 64 for now"
73 /** DECAF_TRUE = -1 so that DECAF_TRUE & x = x */
74 static const decaf_bool_t DECAF_TRUE = -(decaf_bool_t)1;
76 /** DECAF_FALSE = 0 so that DECAF_FALSE & x = 0 */
77 static const decaf_bool_t DECAF_FALSE = 0;
79 /** Another boolean type used to indicate success or failure. */
81 DECAF_SUCCESS = -1, /**< The operation succeeded. */
82 DECAF_FAILURE = 0 /**< The operation failed. */
86 /** Return success if x is true */
87 static DECAF_INLINE decaf_error_t
88 decaf_succeed_if(decaf_bool_t x) {
89 return (decaf_error_t)x;
92 /** Return DECAF_TRUE iff x == DECAF_SUCCESS */
93 static DECAF_INLINE decaf_bool_t
94 decaf_successful(decaf_error_t e) {
95 decaf_dword_t w = ((decaf_word_t)e) ^ ((decaf_word_t)DECAF_SUCCESS);
96 return (w-1)>>DECAF_WORD_BITS;
99 /** Overwrite data with zeros. Uses memset_s if available. */
103 ) DECAF_NONNULL DECAF_API_VIS;
105 /** Compare two buffers, returning DECAF_TRUE if they are equal. */
106 decaf_bool_t decaf_memeq (
110 ) DECAF_NONNULL DECAF_WARN_UNUSED DECAF_API_VIS;
116 #endif /* __DECAF_COMMON_H__ */