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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/include/linux/siphash.h
..
..
@@ -136,4 +136,32 @@
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 	return ___hsiphash_aligned(data, len, key);
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 }
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+/*
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+ * These macros expose the raw SipHash and HalfSipHash permutations.
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+ * Do not use them directly! If you think you have a use for them,
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+ * be sure to CC the maintainer of this file explaining why.
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+ */
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+
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+#define SIPHASH_PERMUTATION(a, b, c, d) ( \
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+	(a) += (b), (b) = rol64((b), 13), (b) ^= (a), (a) = rol64((a), 32), \
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+	(c) += (d), (d) = rol64((d), 16), (d) ^= (c), \
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+	(a) += (d), (d) = rol64((d), 21), (d) ^= (a), \
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+	(c) += (b), (b) = rol64((b), 17), (b) ^= (c), (c) = rol64((c), 32))
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+
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+#define SIPHASH_CONST_0 0x736f6d6570736575ULL
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+#define SIPHASH_CONST_1 0x646f72616e646f6dULL
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+#define SIPHASH_CONST_2 0x6c7967656e657261ULL
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+#define SIPHASH_CONST_3 0x7465646279746573ULL
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+
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+#define HSIPHASH_PERMUTATION(a, b, c, d) ( \
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+	(a) += (b), (b) = rol32((b), 5), (b) ^= (a), (a) = rol32((a), 16), \
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+	(c) += (d), (d) = rol32((d), 8), (d) ^= (c), \
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+	(a) += (d), (d) = rol32((d), 7), (d) ^= (a), \
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+	(c) += (b), (b) = rol32((b), 13), (b) ^= (c), (c) = rol32((c), 16))
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+
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+#define HSIPHASH_CONST_0 0U
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+#define HSIPHASH_CONST_1 0U
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+#define HSIPHASH_CONST_2 0x6c796765U
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+#define HSIPHASH_CONST_3 0x74656462U
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+
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 #endif /* _LINUX_SIPHASH_H */