74 строки
1.9 KiB
C
74 строки
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* Cryptographic utilities
|
|
*
|
|
* Copyright (c) 2023 Herbert Xu <herbert@gondor.apana.org.au>
|
|
*/
|
|
#ifndef _CRYPTO_UTILS_H
|
|
#define _CRYPTO_UTILS_H
|
|
|
|
#include <asm/unaligned.h>
|
|
#include <linux/compiler_attributes.h>
|
|
#include <linux/types.h>
|
|
|
|
void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int size);
|
|
|
|
static inline void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
|
|
{
|
|
if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
|
|
__builtin_constant_p(size) &&
|
|
(size % sizeof(unsigned long)) == 0) {
|
|
unsigned long *d = (unsigned long *)dst;
|
|
unsigned long *s = (unsigned long *)src;
|
|
unsigned long l;
|
|
|
|
while (size > 0) {
|
|
l = get_unaligned(d) ^ get_unaligned(s++);
|
|
put_unaligned(l, d++);
|
|
size -= sizeof(unsigned long);
|
|
}
|
|
} else {
|
|
__crypto_xor(dst, dst, src, size);
|
|
}
|
|
}
|
|
|
|
static inline void crypto_xor_cpy(u8 *dst, const u8 *src1, const u8 *src2,
|
|
unsigned int size)
|
|
{
|
|
if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
|
|
__builtin_constant_p(size) &&
|
|
(size % sizeof(unsigned long)) == 0) {
|
|
unsigned long *d = (unsigned long *)dst;
|
|
unsigned long *s1 = (unsigned long *)src1;
|
|
unsigned long *s2 = (unsigned long *)src2;
|
|
unsigned long l;
|
|
|
|
while (size > 0) {
|
|
l = get_unaligned(s1++) ^ get_unaligned(s2++);
|
|
put_unaligned(l, d++);
|
|
size -= sizeof(unsigned long);
|
|
}
|
|
} else {
|
|
__crypto_xor(dst, src1, src2, size);
|
|
}
|
|
}
|
|
|
|
noinline unsigned long __crypto_memneq(const void *a, const void *b, size_t size);
|
|
|
|
/**
|
|
* crypto_memneq - Compare two areas of memory without leaking
|
|
* timing information.
|
|
*
|
|
* @a: One area of memory
|
|
* @b: Another area of memory
|
|
* @size: The size of the area.
|
|
*
|
|
* Returns 0 when data is equal, 1 otherwise.
|
|
*/
|
|
static inline int crypto_memneq(const void *a, const void *b, size_t size)
|
|
{
|
|
return __crypto_memneq(a, b, size) != 0UL ? 1 : 0;
|
|
}
|
|
|
|
#endif /* _CRYPTO_UTILS_H */
|