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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374/* 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 */