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/* 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 <linux/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 */
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