/* 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 */