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Diffstat (limited to 'roms/edk2/CryptoPkg/Library/OpensslLib/openssl/boringssl/crypto/internal.h')
| -rw-r--r-- | roms/edk2/CryptoPkg/Library/OpensslLib/openssl/boringssl/crypto/internal.h | 608 |
1 files changed, 608 insertions, 0 deletions
diff --git a/roms/edk2/CryptoPkg/Library/OpensslLib/openssl/boringssl/crypto/internal.h b/roms/edk2/CryptoPkg/Library/OpensslLib/openssl/boringssl/crypto/internal.h new file mode 100644 index 000000000..272495676 --- /dev/null +++ b/roms/edk2/CryptoPkg/Library/OpensslLib/openssl/boringssl/crypto/internal.h @@ -0,0 +1,608 @@ +/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) + * All rights reserved. + * + * This package is an SSL implementation written + * by Eric Young (eay@cryptsoft.com). + * The implementation was written so as to conform with Netscapes SSL. + * + * This library is free for commercial and non-commercial use as long as + * the following conditions are aheared to. The following conditions + * apply to all code found in this distribution, be it the RC4, RSA, + * lhash, DES, etc., code; not just the SSL code. The SSL documentation + * included with this distribution is covered by the same copyright terms + * except that the holder is Tim Hudson (tjh@cryptsoft.com). + * + * Copyright remains Eric Young's, and as such any Copyright notices in + * the code are not to be removed. + * If this package is used in a product, Eric Young should be given attribution + * as the author of the parts of the library used. + * This can be in the form of a textual message at program startup or + * in documentation (online or textual) provided with the package. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * "This product includes cryptographic software written by + * Eric Young (eay@cryptsoft.com)" + * The word 'cryptographic' can be left out if the rouines from the library + * being used are not cryptographic related :-). + * 4. If you include any Windows specific code (or a derivative thereof) from + * the apps directory (application code) you must include an acknowledgement: + * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" + * + * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * The licence and distribution terms for any publically available version or + * derivative of this code cannot be changed. i.e. this code cannot simply be + * copied and put under another distribution licence + * [including the GNU Public Licence.] + */ +/* ==================================================================== + * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. All advertising materials mentioning features or use of this + * software must display the following acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" + * + * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For written permission, please contact + * openssl-core@openssl.org. + * + * 5. Products derived from this software may not be called "OpenSSL" + * nor may "OpenSSL" appear in their names without prior written + * permission of the OpenSSL Project. + * + * 6. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit (http://www.openssl.org/)" + * + * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY + * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * ==================================================================== + * + * This product includes cryptographic software written by Eric Young + * (eay@cryptsoft.com). This product includes software written by Tim + * Hudson (tjh@cryptsoft.com). */ + +#ifndef OPENSSL_HEADER_CRYPTO_INTERNAL_H +#define OPENSSL_HEADER_CRYPTO_INTERNAL_H + +#include <openssl/ex_data.h> +#include <openssl/thread.h> + +#include <string.h> + +#if defined(_MSC_VER) +#if !defined(__cplusplus) || _MSC_VER < 1900 +#define alignas(x) __declspec(align(x)) +#define alignof __alignof +#endif +#else +#include <stdalign.h> +#endif + +#if !defined(OPENSSL_NO_THREADS) && \ + (!defined(OPENSSL_WINDOWS) || defined(__MINGW32__)) +#include <pthread.h> +#define OPENSSL_PTHREADS +#endif + +#if !defined(OPENSSL_NO_THREADS) && !defined(OPENSSL_PTHREADS) && \ + defined(OPENSSL_WINDOWS) +#define OPENSSL_WINDOWS_THREADS +OPENSSL_MSVC_PRAGMA(warning(push, 3)) +#include <windows.h> +OPENSSL_MSVC_PRAGMA(warning(pop)) +#endif + +#if defined(__cplusplus) +extern "C" { +#endif + + +#if defined(OPENSSL_X86) || defined(OPENSSL_X86_64) || defined(OPENSSL_ARM) || \ + defined(OPENSSL_AARCH64) || defined(OPENSSL_PPC64LE) +/* OPENSSL_cpuid_setup initializes the platform-specific feature cache. */ +void OPENSSL_cpuid_setup(void); +#endif + + +#if !defined(_MSC_VER) && defined(OPENSSL_64_BIT) +typedef __int128_t int128_t; +typedef __uint128_t uint128_t; +#endif + +#define OPENSSL_ARRAY_SIZE(array) (sizeof(array) / sizeof((array)[0])) + +/* buffers_alias returns one if |a| and |b| alias and zero otherwise. */ +static inline int buffers_alias(const uint8_t *a, size_t a_len, + const uint8_t *b, size_t b_len) { + /* Cast |a| and |b| to integers. In C, pointer comparisons between unrelated + * objects are undefined whereas pointer to integer conversions are merely + * implementation-defined. We assume the implementation defined it in a sane + * way. */ + uintptr_t a_u = (uintptr_t)a; + uintptr_t b_u = (uintptr_t)b; + return a_u + a_len > b_u && b_u + b_len > a_u; +} + + +/* Constant-time utility functions. + * + * The following methods return a bitmask of all ones (0xff...f) for true and 0 + * for false. This is useful for choosing a value based on the result of a + * conditional in constant time. For example, + * + * if (a < b) { + * c = a; + * } else { + * c = b; + * } + * + * can be written as + * + * unsigned int lt = constant_time_lt(a, b); + * c = constant_time_select(lt, a, b); */ + +/* constant_time_msb returns the given value with the MSB copied to all the + * other bits. */ +static inline unsigned int constant_time_msb(unsigned int a) { + return (unsigned int)((int)(a) >> (sizeof(int) * 8 - 1)); +} + +/* constant_time_lt returns 0xff..f if a < b and 0 otherwise. */ +static inline unsigned int constant_time_lt(unsigned int a, unsigned int b) { + /* Consider the two cases of the problem: + * msb(a) == msb(b): a < b iff the MSB of a - b is set. + * msb(a) != msb(b): a < b iff the MSB of b is set. + * + * If msb(a) == msb(b) then the following evaluates as: + * msb(a^((a^b)|((a-b)^a))) == + * msb(a^((a-b) ^ a)) == (because msb(a^b) == 0) + * msb(a^a^(a-b)) == (rearranging) + * msb(a-b) (because ∀x. x^x == 0) + * + * Else, if msb(a) != msb(b) then the following evaluates as: + * msb(a^((a^b)|((a-b)^a))) == + * msb(a^(𝟙 | ((a-b)^a))) == (because msb(a^b) == 1 and 𝟙 + * represents a value s.t. msb(𝟙) = 1) + * msb(a^𝟙) == (because ORing with 1 results in 1) + * msb(b) + * + * + * Here is an SMT-LIB verification of this formula: + * + * (define-fun lt ((a (_ BitVec 32)) (b (_ BitVec 32))) (_ BitVec 32) + * (bvxor a (bvor (bvxor a b) (bvxor (bvsub a b) a))) + * ) + * + * (declare-fun a () (_ BitVec 32)) + * (declare-fun b () (_ BitVec 32)) + * + * (assert (not (= (= #x00000001 (bvlshr (lt a b) #x0000001f)) (bvult a b)))) + * (check-sat) + * (get-model) + */ + return constant_time_msb(a^((a^b)|((a-b)^a))); +} + +/* constant_time_lt_8 acts like |constant_time_lt| but returns an 8-bit mask. */ +static inline uint8_t constant_time_lt_8(unsigned int a, unsigned int b) { + return (uint8_t)(constant_time_lt(a, b)); +} + +/* constant_time_gt returns 0xff..f if a >= b and 0 otherwise. */ +static inline unsigned int constant_time_ge(unsigned int a, unsigned int b) { + return ~constant_time_lt(a, b); +} + +/* constant_time_ge_8 acts like |constant_time_ge| but returns an 8-bit mask. */ +static inline uint8_t constant_time_ge_8(unsigned int a, unsigned int b) { + return (uint8_t)(constant_time_ge(a, b)); +} + +/* constant_time_is_zero returns 0xff..f if a == 0 and 0 otherwise. */ +static inline unsigned int constant_time_is_zero(unsigned int a) { + /* Here is an SMT-LIB verification of this formula: + * + * (define-fun is_zero ((a (_ BitVec 32))) (_ BitVec 32) + * (bvand (bvnot a) (bvsub a #x00000001)) + * ) + * + * (declare-fun a () (_ BitVec 32)) + * + * (assert (not (= (= #x00000001 (bvlshr (is_zero a) #x0000001f)) (= a #x00000000)))) + * (check-sat) + * (get-model) + */ + return constant_time_msb(~a & (a - 1)); +} + +/* constant_time_is_zero_8 acts like constant_time_is_zero but returns an 8-bit + * mask. */ +static inline uint8_t constant_time_is_zero_8(unsigned int a) { + return (uint8_t)(constant_time_is_zero(a)); +} + +/* constant_time_eq returns 0xff..f if a == b and 0 otherwise. */ +static inline unsigned int constant_time_eq(unsigned int a, unsigned int b) { + return constant_time_is_zero(a ^ b); +} + +/* constant_time_eq_8 acts like |constant_time_eq| but returns an 8-bit mask. */ +static inline uint8_t constant_time_eq_8(unsigned int a, unsigned int b) { + return (uint8_t)(constant_time_eq(a, b)); +} + +/* constant_time_eq_int acts like |constant_time_eq| but works on int values. */ +static inline unsigned int constant_time_eq_int(int a, int b) { + return constant_time_eq((unsigned)(a), (unsigned)(b)); +} + +/* constant_time_eq_int_8 acts like |constant_time_eq_int| but returns an 8-bit + * mask. */ +static inline uint8_t constant_time_eq_int_8(int a, int b) { + return constant_time_eq_8((unsigned)(a), (unsigned)(b)); +} + +/* constant_time_select returns (mask & a) | (~mask & b). When |mask| is all 1s + * or all 0s (as returned by the methods above), the select methods return + * either |a| (if |mask| is nonzero) or |b| (if |mask| is zero). */ +static inline unsigned int constant_time_select(unsigned int mask, + unsigned int a, unsigned int b) { + return (mask & a) | (~mask & b); +} + +/* constant_time_select_8 acts like |constant_time_select| but operates on + * 8-bit values. */ +static inline uint8_t constant_time_select_8(uint8_t mask, uint8_t a, + uint8_t b) { + return (uint8_t)(constant_time_select(mask, a, b)); +} + +/* constant_time_select_int acts like |constant_time_select| but operates on + * ints. */ +static inline int constant_time_select_int(unsigned int mask, int a, int b) { + return (int)(constant_time_select(mask, (unsigned)(a), (unsigned)(b))); +} + + +/* Thread-safe initialisation. */ + +#if defined(OPENSSL_NO_THREADS) +typedef uint32_t CRYPTO_once_t; +#define CRYPTO_ONCE_INIT 0 +#elif defined(OPENSSL_WINDOWS_THREADS) +typedef INIT_ONCE CRYPTO_once_t; +#define CRYPTO_ONCE_INIT INIT_ONCE_STATIC_INIT +#elif defined(OPENSSL_PTHREADS) +typedef pthread_once_t CRYPTO_once_t; +#define CRYPTO_ONCE_INIT PTHREAD_ONCE_INIT +#else +#error "Unknown threading library" +#endif + +/* CRYPTO_once calls |init| exactly once per process. This is thread-safe: if + * concurrent threads call |CRYPTO_once| with the same |CRYPTO_once_t| argument + * then they will block until |init| completes, but |init| will have only been + * called once. + * + * The |once| argument must be a |CRYPTO_once_t| that has been initialised with + * the value |CRYPTO_ONCE_INIT|. */ +OPENSSL_EXPORT void CRYPTO_once(CRYPTO_once_t *once, void (*init)(void)); + + +/* Reference counting. */ + +/* CRYPTO_REFCOUNT_MAX is the value at which the reference count saturates. */ +#define CRYPTO_REFCOUNT_MAX 0xffffffff + +/* CRYPTO_refcount_inc atomically increments the value at |*count| unless the + * value would overflow. It's safe for multiple threads to concurrently call + * this or |CRYPTO_refcount_dec_and_test_zero| on the same + * |CRYPTO_refcount_t|. */ +OPENSSL_EXPORT void CRYPTO_refcount_inc(CRYPTO_refcount_t *count); + +/* CRYPTO_refcount_dec_and_test_zero tests the value at |*count|: + * if it's zero, it crashes the address space. + * if it's the maximum value, it returns zero. + * otherwise, it atomically decrements it and returns one iff the resulting + * value is zero. + * + * It's safe for multiple threads to concurrently call this or + * |CRYPTO_refcount_inc| on the same |CRYPTO_refcount_t|. */ +OPENSSL_EXPORT int CRYPTO_refcount_dec_and_test_zero(CRYPTO_refcount_t *count); + + +/* Locks. + * + * Two types of locks are defined: |CRYPTO_MUTEX|, which can be used in + * structures as normal, and |struct CRYPTO_STATIC_MUTEX|, which can be used as + * a global lock. A global lock must be initialised to the value + * |CRYPTO_STATIC_MUTEX_INIT|. + * + * |CRYPTO_MUTEX| can appear in public structures and so is defined in + * thread.h as a structure large enough to fit the real type. The global lock is + * a different type so it may be initialized with platform initializer macros.*/ + +#if defined(OPENSSL_NO_THREADS) +struct CRYPTO_STATIC_MUTEX { + char padding; /* Empty structs have different sizes in C and C++. */ +}; +#define CRYPTO_STATIC_MUTEX_INIT { 0 } +#elif defined(OPENSSL_WINDOWS_THREADS) +struct CRYPTO_STATIC_MUTEX { + SRWLOCK lock; +}; +#define CRYPTO_STATIC_MUTEX_INIT { SRWLOCK_INIT } +#elif defined(OPENSSL_PTHREADS) +struct CRYPTO_STATIC_MUTEX { + pthread_rwlock_t lock; +}; +#define CRYPTO_STATIC_MUTEX_INIT { PTHREAD_RWLOCK_INITIALIZER } +#else +#error "Unknown threading library" +#endif + +/* CRYPTO_MUTEX_init initialises |lock|. If |lock| is a static variable, use a + * |CRYPTO_STATIC_MUTEX|. */ +OPENSSL_EXPORT void CRYPTO_MUTEX_init(CRYPTO_MUTEX *lock); + +/* CRYPTO_MUTEX_lock_read locks |lock| such that other threads may also have a + * read lock, but none may have a write lock. */ +OPENSSL_EXPORT void CRYPTO_MUTEX_lock_read(CRYPTO_MUTEX *lock); + +/* CRYPTO_MUTEX_lock_write locks |lock| such that no other thread has any type + * of lock on it. */ +OPENSSL_EXPORT void CRYPTO_MUTEX_lock_write(CRYPTO_MUTEX *lock); + +/* CRYPTO_MUTEX_unlock_read unlocks |lock| for reading. */ +OPENSSL_EXPORT void CRYPTO_MUTEX_unlock_read(CRYPTO_MUTEX *lock); + +/* CRYPTO_MUTEX_unlock_write unlocks |lock| for writing. */ +OPENSSL_EXPORT void CRYPTO_MUTEX_unlock_write(CRYPTO_MUTEX *lock); + +/* CRYPTO_MUTEX_cleanup releases all resources held by |lock|. */ +OPENSSL_EXPORT void CRYPTO_MUTEX_cleanup(CRYPTO_MUTEX *lock); + +/* CRYPTO_STATIC_MUTEX_lock_read locks |lock| such that other threads may also + * have a read lock, but none may have a write lock. The |lock| variable does + * not need to be initialised by any function, but must have been statically + * initialised with |CRYPTO_STATIC_MUTEX_INIT|. */ +OPENSSL_EXPORT void CRYPTO_STATIC_MUTEX_lock_read( + struct CRYPTO_STATIC_MUTEX *lock); + +/* CRYPTO_STATIC_MUTEX_lock_write locks |lock| such that no other thread has + * any type of lock on it. The |lock| variable does not need to be initialised + * by any function, but must have been statically initialised with + * |CRYPTO_STATIC_MUTEX_INIT|. */ +OPENSSL_EXPORT void CRYPTO_STATIC_MUTEX_lock_write( + struct CRYPTO_STATIC_MUTEX *lock); + +/* CRYPTO_STATIC_MUTEX_unlock_read unlocks |lock| for reading. */ +OPENSSL_EXPORT void CRYPTO_STATIC_MUTEX_unlock_read( + struct CRYPTO_STATIC_MUTEX *lock); + +/* CRYPTO_STATIC_MUTEX_unlock_write unlocks |lock| for writing. */ +OPENSSL_EXPORT void CRYPTO_STATIC_MUTEX_unlock_write( + struct CRYPTO_STATIC_MUTEX *lock); + + +/* Thread local storage. */ + +/* thread_local_data_t enumerates the types of thread-local data that can be + * stored. */ +typedef enum { + OPENSSL_THREAD_LOCAL_ERR = 0, + OPENSSL_THREAD_LOCAL_RAND, + OPENSSL_THREAD_LOCAL_URANDOM_BUF, + OPENSSL_THREAD_LOCAL_TEST, + NUM_OPENSSL_THREAD_LOCALS, +} thread_local_data_t; + +/* thread_local_destructor_t is the type of a destructor function that will be + * called when a thread exits and its thread-local storage needs to be freed. */ +typedef void (*thread_local_destructor_t)(void *); + +/* CRYPTO_get_thread_local gets the pointer value that is stored for the + * current thread for the given index, or NULL if none has been set. */ +OPENSSL_EXPORT void *CRYPTO_get_thread_local(thread_local_data_t value); + +/* CRYPTO_set_thread_local sets a pointer value for the current thread at the + * given index. This function should only be called once per thread for a given + * |index|: rather than update the pointer value itself, update the data that + * is pointed to. + * + * The destructor function will be called when a thread exits to free this + * thread-local data. All calls to |CRYPTO_set_thread_local| with the same + * |index| should have the same |destructor| argument. The destructor may be + * called with a NULL argument if a thread that never set a thread-local + * pointer for |index|, exits. The destructor may be called concurrently with + * different arguments. + * + * This function returns one on success or zero on error. If it returns zero + * then |destructor| has been called with |value| already. */ +OPENSSL_EXPORT int CRYPTO_set_thread_local( + thread_local_data_t index, void *value, + thread_local_destructor_t destructor); + + +/* ex_data */ + +typedef struct crypto_ex_data_func_st CRYPTO_EX_DATA_FUNCS; + +/* CRYPTO_EX_DATA_CLASS tracks the ex_indices registered for a type which + * supports ex_data. It should defined as a static global within the module + * which defines that type. */ +typedef struct { + struct CRYPTO_STATIC_MUTEX lock; + STACK_OF(CRYPTO_EX_DATA_FUNCS) *meth; + /* num_reserved is one if the ex_data index zero is reserved for legacy + * |TYPE_get_app_data| functions. */ + uint8_t num_reserved; +} CRYPTO_EX_DATA_CLASS; + +#define CRYPTO_EX_DATA_CLASS_INIT {CRYPTO_STATIC_MUTEX_INIT, NULL, 0} +#define CRYPTO_EX_DATA_CLASS_INIT_WITH_APP_DATA \ + {CRYPTO_STATIC_MUTEX_INIT, NULL, 1} + +/* CRYPTO_get_ex_new_index allocates a new index for |ex_data_class| and writes + * it to |*out_index|. Each class of object should provide a wrapper function + * that uses the correct |CRYPTO_EX_DATA_CLASS|. It returns one on success and + * zero otherwise. */ +OPENSSL_EXPORT int CRYPTO_get_ex_new_index(CRYPTO_EX_DATA_CLASS *ex_data_class, + int *out_index, long argl, + void *argp, CRYPTO_EX_dup *dup_func, + CRYPTO_EX_free *free_func); + +/* CRYPTO_set_ex_data sets an extra data pointer on a given object. Each class + * of object should provide a wrapper function. */ +OPENSSL_EXPORT int CRYPTO_set_ex_data(CRYPTO_EX_DATA *ad, int index, void *val); + +/* CRYPTO_get_ex_data returns an extra data pointer for a given object, or NULL + * if no such index exists. Each class of object should provide a wrapper + * function. */ +OPENSSL_EXPORT void *CRYPTO_get_ex_data(const CRYPTO_EX_DATA *ad, int index); + +/* CRYPTO_new_ex_data initialises a newly allocated |CRYPTO_EX_DATA|. */ +OPENSSL_EXPORT void CRYPTO_new_ex_data(CRYPTO_EX_DATA *ad); + +/* CRYPTO_dup_ex_data duplicates |from| into a freshly allocated + * |CRYPTO_EX_DATA|, |to|. Both of which are inside objects of the given + * class. It returns one on success and zero otherwise. */ +OPENSSL_EXPORT int CRYPTO_dup_ex_data(CRYPTO_EX_DATA_CLASS *ex_data_class, + CRYPTO_EX_DATA *to, + const CRYPTO_EX_DATA *from); + +/* CRYPTO_free_ex_data frees |ad|, which is embedded inside |obj|, which is an + * object of the given class. */ +OPENSSL_EXPORT void CRYPTO_free_ex_data(CRYPTO_EX_DATA_CLASS *ex_data_class, + void *obj, CRYPTO_EX_DATA *ad); + + +/* Language bug workarounds. + * + * Most C standard library functions are undefined if passed NULL, even when the + * corresponding length is zero. This gives them (and, in turn, all functions + * which call them) surprising behavior on empty arrays. Some compilers will + * miscompile code due to this rule. See also + * https://www.imperialviolet.org/2016/06/26/nonnull.html + * + * These wrapper functions behave the same as the corresponding C standard + * functions, but behave as expected when passed NULL if the length is zero. + * + * Note |OPENSSL_memcmp| is a different function from |CRYPTO_memcmp|. */ + +/* C++ defines |memchr| as a const-correct overload. */ +#if defined(__cplusplus) +extern "C++" { + +static inline const void *OPENSSL_memchr(const void *s, int c, size_t n) { + if (n == 0) { + return NULL; + } + + return memchr(s, c, n); +} + +static inline void *OPENSSL_memchr(void *s, int c, size_t n) { + if (n == 0) { + return NULL; + } + + return memchr(s, c, n); +} + +} /* extern "C++" */ +#else /* __cplusplus */ + +static inline void *OPENSSL_memchr(const void *s, int c, size_t n) { + if (n == 0) { + return NULL; + } + + return memchr(s, c, n); +} + +#endif /* __cplusplus */ + +static inline int OPENSSL_memcmp(const void *s1, const void *s2, size_t n) { + if (n == 0) { + return 0; + } + + return memcmp(s1, s2, n); +} + +static inline void *OPENSSL_memcpy(void *dst, const void *src, size_t n) { + if (n == 0) { + return dst; + } + + return memcpy(dst, src, n); +} + +static inline void *OPENSSL_memmove(void *dst, const void *src, size_t n) { + if (n == 0) { + return dst; + } + + return memmove(dst, src, n); +} + +static inline void *OPENSSL_memset(void *dst, int c, size_t n) { + if (n == 0) { + return dst; + } + + return memset(dst, c, n); +} + + +#if defined(__cplusplus) +} /* extern C */ +#endif + +#endif /* OPENSSL_HEADER_CRYPTO_INTERNAL_H */ |