* cc.h
* corecrypto
*
- * Created by Michael Brouwer on 12/16/10.
- * Copyright 2010,2011 Apple Inc. All rights reserved.
+ * Created on 12/16/2010
+ *
+ * Copyright (c) 2010,2011,2012,2014,2015 Apple Inc. All rights reserved.
*
*/
#define _CORECRYPTO_CC_H_
#include <corecrypto/cc_config.h>
+#include <corecrypto/cc_error.h>
#include <string.h>
#include <stdint.h>
+/* Provide a general purpose macro concat method. */
+#define cc_concat_(a, b) a##b
+#define cc_concat(a, b) cc_concat_(a, b)
+
+/* Manage asserts here because a few functions in header public files do use asserts */
+#define cc_assert(x) assert(x)
#if CC_KERNEL
#include <kern/assert.h>
+#elif CC_USE_S3
+#define assert(args) // No assert in S3
#else
#include <assert.h>
-#include <stdio.h>
#endif
+/* Provide a static assert that can be used to create compile-type failures. */
+#define cc_static_assert(e,m) \
+ ;enum { cc_concat(static_assert_, __COUNTER__) = 1/(int)(!!(e)) }
+
/* Declare a struct element with a guarenteed alignment of _alignment_.
The resulting struct can be used to create arrays that are aligned by
a certain amount. */
#define cc_aligned_struct(_alignment_) \
- typedef struct { \
- uint8_t b[_alignment_]; \
- } __attribute__((aligned(_alignment_)))
+typedef struct { \
+uint8_t b[_alignment_]; \
+} CC_ALIGNED(_alignment_)
/* number of array elements used in a cc_ctx_decl */
#define cc_ctx_n(_type_, _size_) ((_size_ + sizeof(_type_) - 1) / sizeof(_type_))
/* sizeof of a context declared with cc_ctx_decl */
#define cc_ctx_sizeof(_type_, _size_) sizeof(_type_[cc_ctx_n(_type_, _size_)])
-#define cc_ctx_decl(_type_, _size_, _name_) \
- _type_ _name_[cc_ctx_n(_type_, _size_)]
-
-#if CC_HAS_BZERO
-#define cc_zero(_size_,_data_) bzero((_data_), (_size_))
+/*
+ 1. _alloca cannot be removed becasue this header file is compiled with both MSVC++ and with clang.
+ 2. The _MSC_VER version of cc_ctx_decl() is not compatible with the way *_decl macros as used in CommonCrypto, AppleKeyStore and SecurityFrameworks. To observe the incompatibilities and errors, use below definition. Corecrypto itself, accepts both deinitions
+ #define cc_ctx_decl(_type_, _size_, _name_) _type_ _name_ ## _array[cc_ctx_n(_type_, (_size_))]; _type_ *_name_ = _name_ ## _array
+ 3. Never use sizeof() operator for the variables declared with cc_ctx_decl(), because it is not be compatible with the _MSC_VER version of cc_ctx_decl().
+ */
+#if defined(_MSC_VER)
+#define cc_ctx_decl(_type_, _size_, _name_) _type_ * _name_ = (_type_ *) _alloca(sizeof(_type_) * cc_ctx_n(_type_, _size_) )
#else
-/* Alternate version if you don't have bzero. */
-#define cc_zero(_size_,_data_) memset((_data_),0 ,(_size_))
+#define cc_ctx_decl(_type_, _size_, _name_) _type_ _name_ [cc_ctx_n(_type_, _size_)]
#endif
-#if CC_KERNEL
-#define cc_printf(x...) printf(x)
-#else
-#define cc_printf(x...) fprintf(stderr, x)
-#endif
+/* bzero is deprecated. memset is the way to go */
+/* FWIW, L4, HEXAGON and ARMCC even with gnu compatibility mode don't have bzero */
+#define cc_zero(_size_,_data_) memset((_data_),0 ,(_size_))
-#define cc_assert(x) assert(x)
+/*!
+ @brief cc_clear(len, dst) zeroizes array dst and it will not be optimized out.
+ @discussion It is used to clear sensitive data, particularly when the are defined in the stack
+ @param len number of bytes to be cleared in dst
+ @param dst input array
+ */
+CC_NONNULL((2))
+void cc_clear(size_t len, void *dst);
#define cc_copy(_size_, _dst_, _src_) memcpy(_dst_, _src_, _size_)
-CC_INLINE CC_NONNULL2 CC_NONNULL3 CC_NONNULL4
+CC_INLINE CC_NONNULL((2, 3, 4))
void cc_xor(size_t size, void *r, const void *s, const void *t) {
uint8_t *_r=(uint8_t *)r;
- const uint8_t *_s=(uint8_t *)s;
- const uint8_t *_t=(uint8_t *)t;
+ const uint8_t *_s=(const uint8_t *)s;
+ const uint8_t *_t=(const uint8_t *)t;
while (size--) {
_r[size] = _s[size] ^ _t[size];
}
}
+/*!
+ @brief cc_cmp_safe(num, pt1, pt2) compares two array ptr1 and ptr2 of num bytes.
+ @discussion The execution time/cycles is independent of the data and therefore guarantees no leak about the data. However, the execution time depends on num.
+ @param num number of bytes in each array
+ @param ptr1 input array
+ @param ptr2 input array
+ @return returns 0 if the num bytes starting at ptr1 are identical to the num bytes starting at ptr2 and 1 if they are different or if num is 0 (empty arrays).
+ */
+CC_NONNULL((2, 3))
+int cc_cmp_safe (size_t num, const void * ptr1, const void * ptr2);
+
/* Exchange S and T of any type. NOTE: Both and S and T are evaluated
mutliple times and MUST NOT be expressions. */
#define CC_SWAP(S,T) do { \
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