5  * SipHash: a fast short-input PRF
8  * This implementation is specifically for SipHash2-4 for a secure PRF
9  * and HalfSipHash1-3/SipHash1-3 for an insecure PRF only suitable for
18 #include <asm/word-at-a-time.h>
23 	v0 += v1; v1 = rol64(v1, 13); v1 ^= v0; v0 = rol64(v0, 32); \
25 	v0 += v3; v3 = rol64(v3, 21); v3 ^= v0; \
30 	u64 v0 = 0x736f6d6570736575ULL; \
35 	v3 ^= key->key[1]; \
36 	v2 ^= key->key[0]; \
37 	v1 ^= key->key[1]; \
38 	v0 ^= key->key[0];
44 	v0 ^= b; \
50 	return (v0 ^ v1) ^ (v2 ^ v3);
54 	const u8 *end = data + len - (len % sizeof(u64));  in __siphash_aligned()
55 	const u8 left = len & (sizeof(u64) - 1);  in __siphash_aligned()
63 		v0 ^= m;  in __siphash_aligned()
77 	case 1: b |= end[0];  in __siphash_aligned()
87 	const u8 *end = data + len - (len % sizeof(u64));  in __siphash_unaligned()
88 	const u8 left = len & (sizeof(u64) - 1);  in __siphash_unaligned()
96 		v0 ^= m;  in __siphash_unaligned()
110 	case 1: b |= end[0];  in __siphash_unaligned()
119  * siphash_1u64 - compute 64-bit siphash PRF value of a u64
129 	v0 ^= first;  in siphash_1u64()
135  * siphash_2u64 - compute 64-bit siphash PRF value of 2 u64
146 	v0 ^= first;  in siphash_2u64()
150 	v0 ^= second;  in siphash_2u64()
156  * siphash_3u64 - compute 64-bit siphash PRF value of 3 u64
169 	v0 ^= first;  in siphash_3u64()
173 	v0 ^= second;  in siphash_3u64()
177 	v0 ^= third;  in siphash_3u64()
183  * siphash_4u64 - compute 64-bit siphash PRF value of 4 u64
197 	v0 ^= first;  in siphash_4u64()
201 	v0 ^= second;  in siphash_4u64()
205 	v0 ^= third;  in siphash_4u64()
209 	v0 ^= forth;  in siphash_4u64()
230 	v0 ^= combined;  in siphash_3u32()
237 /* Note that on 64-bit, we make HalfSipHash1-3 actually be SipHash1-3, for
238  * performance reasons. On 32-bit, below, we actually implement HalfSipHash1-3.
246 	v0 ^= b; \
251 	return (v0 ^ v1) ^ (v2 ^ v3);
255 	const u8 *end = data + len - (len % sizeof(u64));  in __hsiphash_aligned()
256 	const u8 left = len & (sizeof(u64) - 1);  in __hsiphash_aligned()
263 		v0 ^= m;  in __hsiphash_aligned()
277 	case 1: b |= end[0];  in __hsiphash_aligned()
288 	const u8 *end = data + len - (len % sizeof(u64));  in __hsiphash_unaligned()
289 	const u8 left = len & (sizeof(u64) - 1);  in __hsiphash_unaligned()
296 		v0 ^= m;  in __hsiphash_unaligned()
310 	case 1: b |= end[0];  in __hsiphash_unaligned()
319  * hsiphash_1u32 - compute 64-bit hsiphash PRF value of a u32
332  * hsiphash_2u32 - compute 32-bit hsiphash PRF value of 2 u32
343 	v0 ^= combined;  in hsiphash_2u32()
349  * hsiphash_3u32 - compute 32-bit hsiphash PRF value of 3 u32
362 	v0 ^= combined;  in hsiphash_3u32()
369  * hsiphash_4u32 - compute 32-bit hsiphash PRF value of 4 u32
383 	v0 ^= combined;  in hsiphash_4u32()
387 	v0 ^= combined;  in hsiphash_4u32()
394 	v0 += v1; v1 = rol32(v1, 5); v1 ^= v0; v0 = rol32(v0, 16); \
396 	v0 += v3; v3 = rol32(v3, 7); v3 ^= v0; \
401 	u32 v0 = 0; \
406 	v3 ^= key->key[1]; \
407 	v2 ^= key->key[0]; \
408 	v1 ^= key->key[1]; \
409 	v0 ^= key->key[0];
414 	v0 ^= b; \
423 	const u8 *end = data + len - (len % sizeof(u32));  in __hsiphash_aligned()
424 	const u8 left = len & (sizeof(u32) - 1);  in __hsiphash_aligned()
431 		v0 ^= m;  in __hsiphash_aligned()
436 	case 1: b |= end[0];  in __hsiphash_aligned()
446 	const u8 *end = data + len - (len % sizeof(u32));  in __hsiphash_unaligned()
447 	const u8 left = len & (sizeof(u32) - 1);  in __hsiphash_unaligned()
454 		v0 ^= m;  in __hsiphash_unaligned()
459 	case 1: b |= end[0];  in __hsiphash_unaligned()
467  * hsiphash_1u32 - compute 32-bit hsiphash PRF value of a u32
476 	v0 ^= first;  in hsiphash_1u32()
482  * hsiphash_2u32 - compute 32-bit hsiphash PRF value of 2 u32
492 	v0 ^= first;  in hsiphash_2u32()
495 	v0 ^= second;  in hsiphash_2u32()
501  * hsiphash_3u32 - compute 32-bit hsiphash PRF value of 3 u32
513 	v0 ^= first;  in hsiphash_3u32()
516 	v0 ^= second;  in hsiphash_3u32()
519 	v0 ^= third;  in hsiphash_3u32()
525  * hsiphash_4u32 - compute 32-bit hsiphash PRF value of 4 u32
538 	v0 ^= first;  in hsiphash_4u32()
541 	v0 ^= second;  in hsiphash_4u32()
544 	v0 ^= third;  in hsiphash_4u32()
547 	v0 ^= forth;  in hsiphash_4u32()