1/*
2 *  cc.h
3 *  corecrypto
4 *
5 *  Created by Michael Brouwer on 12/16/10.
6 *  Copyright 2010,2011 Apple Inc. All rights reserved.
7 *
8 */
9
10#ifndef _CORECRYPTO_CC_H_
11#define _CORECRYPTO_CC_H_
12
13#include <corecrypto/cc_config.h>
14#include <string.h>
15#include <stdint.h>
16
17#if KERNEL
18#include <kern/assert.h>
19#else
20#include <assert.h>
21#endif
22
23/* Declare a struct element with a guarenteed alignment of _alignment_.
24   The resulting struct can be used to create arrays that are aligned by
25   a certain amount.  */
26#define cc_aligned_struct(_alignment_)  \
27    typedef struct { \
28        uint8_t b[_alignment_]; \
29    } __attribute__((aligned(_alignment_)))
30
31/* number of array elements used in a cc_ctx_decl */
32#define cc_ctx_n(_type_, _size_) ((_size_ + sizeof(_type_) - 1) / sizeof(_type_))
33
34/* sizeof of a context declared with cc_ctx_decl */
35#define cc_ctx_sizeof(_type_, _size_) sizeof(_type_[cc_ctx_n(_type_, _size_)])
36
37#define cc_ctx_decl(_type_, _size_, _name_)  \
38    _type_ _name_[cc_ctx_n(_type_, _size_)]
39
40#define cc_zero(_size_,_data_) bzero((_data_), (_size_))
41
42#define cc_copy(_size_, _dst_, _src_) memcpy(_dst_, _src_, _size_)
43
44#define cc_ctx_clear(_type_, _size_, _name_)  \
45    cc_zero((_size_ + sizeof(_type_) - 1) / sizeof(_type_), _name_)
46
47CC_INLINE CC_NONNULL2 CC_NONNULL3 CC_NONNULL4
48void cc_xor(size_t size, void *r, const void *s, const void *t) {
49    uint8_t *_r=(uint8_t *)r;
50    const uint8_t *_s=(uint8_t *)s;
51    const uint8_t *_t=(uint8_t *)t;
52    while (size--) {
53        _r[size] = _s[size] ^ _t[size];
54    }
55}
56
57/* Exchange S and T of any type.  NOTE: Both and S and T are evaluated
58   mutliple times and MUST NOT be expressions. */
59#define CC_SWAP(S,T)  do { \
60    __typeof__(S) _cc_swap_tmp = S; S = T; T = _cc_swap_tmp; \
61} while(0)
62
63/* Return the maximum value between S and T. */
64#define CC_MAX(S, T) ({__typeof__(S) _cc_max_s = S; __typeof__(T) _cc_max_t = T; _cc_max_s > _cc_max_t ? _cc_max_s : _cc_max_t;})
65
66/* Return the minimum value between S and T. */
67#define CC_MIN(S, T) ({__typeof__(S) _cc_min_s = S; __typeof__(T) _cc_min_t = T; _cc_min_s <= _cc_min_t ? _cc_min_s : _cc_min_t;})
68
69#endif /* _CORECRYPTO_CC_H_ */
70