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>
23 /* Goldilocks' build flags default to hidden and stripping executables. */
25 #if defined(DOXYGEN) && !defined(__attribute__)
26 #define __attribute__((x))
28 #define DECAF_API_VIS __attribute__((visibility("default")))
29 #define DECAF_NOINLINE __attribute__((noinline))
30 #define DECAF_WARN_UNUSED __attribute__((warn_unused_result))
31 #define DECAF_NONNULL __attribute__((nonnull))
34 /* Internal word types.
36 * Somewhat tricky. This could be decided separately per platform. However,
37 * the structs do need to be all the same size and alignment on a given
38 * platform to support dynamic linking, since even if you header was built
39 * with eg arch_neon, you might end up linking a library built with arch_arm32.
41 #ifndef DECAF_WORD_BITS
42 #if (defined(__ILP64__) || defined(__amd64__) || defined(__x86_64__) || (((__UINT_FAST32_MAX__)>>30)>>30))
43 #define DECAF_WORD_BITS 64 /**< The number of bits in a word */
45 #define DECAF_WORD_BITS 32 /**< The number of bits in a word */
49 #if DECAF_WORD_BITS == 64
50 typedef uint64_t decaf_word_t; /**< Word size for internal computations */
51 typedef int64_t decaf_sword_t; /**< Signed word size for internal computations */
52 typedef uint64_t decaf_bool_t; /**< "Boolean" type, will be set to all-zero or all-one (i.e. -1u) */
53 typedef __uint128_t decaf_dword_t; /**< Double-word size for internal computations */
54 typedef __int128_t decaf_dsword_t; /**< Signed double-word size for internal computations */
55 #elif DECAF_WORD_BITS == 32 /**< The number of bits in a word */
56 typedef uint32_t decaf_word_t; /**< Word size for internal computations */
57 typedef int32_t decaf_sword_t; /**< Signed word size for internal computations */
58 typedef uint32_t decaf_bool_t; /**< "Boolean" type, will be set to all-zero or all-one (i.e. -1u) */
59 typedef uint64_t decaf_dword_t; /**< Double-word size for internal computations */
60 typedef int64_t decaf_dsword_t; /**< Signed double-word size for internal computations */
62 #error "Only supporting DECAF_WORD_BITS = 32 or 64 for now"
65 /** DECAF_TRUE = -1 so that DECAF_TRUE & x = x */
66 static const decaf_bool_t DECAF_TRUE = -(decaf_bool_t)1;
68 /** DECAF_FALSE = 0 so that DECAF_FALSE & x = 0 */
69 static const decaf_bool_t DECAF_FALSE = 0;
71 /** Another boolean type used to indicate success or failure. */
73 DECAF_SUCCESS = -1, /**< The operation succeeded. */
74 DECAF_FAILURE = 0 /**< The operation failed. */
78 /** Return success if x is true */
79 static ossl_inline decaf_error_t
80 decaf_succeed_if(decaf_bool_t x) {
81 return (decaf_error_t)x;
84 /** Return DECAF_TRUE iff x == DECAF_SUCCESS */
85 static ossl_inline decaf_bool_t
86 decaf_successful(decaf_error_t e) {
87 decaf_dword_t w = ((decaf_word_t)e) ^ ((decaf_word_t)DECAF_SUCCESS);
88 return (w-1)>>DECAF_WORD_BITS;
95 #endif /* __DECAF_COMMON_H__ */