1 /* SPDX-License-Identifier: GPL-2.0-or-later * 1
2 /*
3 * Cryptographic utilities
4 *
5 * Copyright (c) 2023 Herbert Xu <herbert@gond
6 */
7 #ifndef _CRYPTO_UTILS_H
8 #define _CRYPTO_UTILS_H
9
10 #include <asm/unaligned.h>
11 #include <linux/compiler_attributes.h>
12 #include <linux/types.h>
13
14 void __crypto_xor(u8 *dst, const u8 *src1, con
15
16 static inline void crypto_xor(u8 *dst, const u
17 {
18 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_U
19 __builtin_constant_p(size) &&
20 (size % sizeof(unsigned long)) ==
21 unsigned long *d = (unsigned l
22 unsigned long *s = (unsigned l
23 unsigned long l;
24
25 while (size > 0) {
26 l = get_unaligned(d) ^
27 put_unaligned(l, d++);
28 size -= sizeof(unsigne
29 }
30 } else {
31 __crypto_xor(dst, dst, src, si
32 }
33 }
34
35 static inline void crypto_xor_cpy(u8 *dst, con
36 unsigned int
37 {
38 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_U
39 __builtin_constant_p(size) &&
40 (size % sizeof(unsigned long)) ==
41 unsigned long *d = (unsigned l
42 unsigned long *s1 = (unsigned
43 unsigned long *s2 = (unsigned
44 unsigned long l;
45
46 while (size > 0) {
47 l = get_unaligned(s1++
48 put_unaligned(l, d++);
49 size -= sizeof(unsigne
50 }
51 } else {
52 __crypto_xor(dst, src1, src2,
53 }
54 }
55
56 noinline unsigned long __crypto_memneq(const v
57
58 /**
59 * crypto_memneq - Compare two areas of memory
60 * timing information.
61 *
62 * @a: One area of memory
63 * @b: Another area of memory
64 * @size: The size of the area.
65 *
66 * Returns 0 when data is equal, 1 otherwise.
67 */
68 static inline int crypto_memneq(const void *a,
69 {
70 return __crypto_memneq(a, b, size) !=
71 }
72
73 #endif /* _CRYPTO_UTILS_H */
74
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