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