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>
21 #define SIPROUND SIPHASH_PERMUTATION(v0, v1, v2, v3)
24 	u64 v0 = SIPHASH_CONST_0; \
29 	v3 ^= key->key[1]; \
30 	v2 ^= key->key[0]; \
31 	v1 ^= key->key[1]; \
32 	v0 ^= key->key[0];
38 	v0 ^= b; \
44 	return (v0 ^ v1) ^ (v2 ^ v3);
49 	const u8 *end = data + len - (len % sizeof(u64));  in __siphash_aligned()
50 	const u8 left = len & (sizeof(u64) - 1);  in __siphash_aligned()
58 		v0 ^= m;  in __siphash_aligned()
72 	case 1: b |= end[0];  in __siphash_aligned()
82 	const u8 *end = data + len - (len % sizeof(u64));  in __siphash_unaligned()
83 	const u8 left = len & (sizeof(u64) - 1);  in __siphash_unaligned()
91 		v0 ^= m;  in __siphash_unaligned()
105 	case 1: b |= end[0];  in __siphash_unaligned()
113  * siphash_1u64 - compute 64-bit siphash PRF value of a u64
123 	v0 ^= first;  in siphash_1u64()
129  * siphash_2u64 - compute 64-bit siphash PRF value of 2 u64
140 	v0 ^= first;  in siphash_2u64()
144 	v0 ^= second;  in siphash_2u64()
150  * siphash_3u64 - compute 64-bit siphash PRF value of 3 u64
163 	v0 ^= first;  in siphash_3u64()
167 	v0 ^= second;  in siphash_3u64()
171 	v0 ^= third;  in siphash_3u64()
177  * siphash_4u64 - compute 64-bit siphash PRF value of 4 u64
191 	v0 ^= first;  in siphash_4u64()
195 	v0 ^= second;  in siphash_4u64()
199 	v0 ^= third;  in siphash_4u64()
203 	v0 ^= forth;  in siphash_4u64()
224 	v0 ^= combined;  in siphash_3u32()
231 /* Note that on 64-bit, we make HalfSipHash1-3 actually be SipHash1-3, for
232  * performance reasons. On 32-bit, below, we actually implement HalfSipHash1-3.
240 	v0 ^= b; \
245 	return (v0 ^ v1) ^ (v2 ^ v3);
250 	const u8 *end = data + len - (len % sizeof(u64));  in __hsiphash_aligned()
251 	const u8 left = len & (sizeof(u64) - 1);  in __hsiphash_aligned()
258 		v0 ^= m;  in __hsiphash_aligned()
272 	case 1: b |= end[0];  in __hsiphash_aligned()
283 	const u8 *end = data + len - (len % sizeof(u64));  in __hsiphash_unaligned()
284 	const u8 left = len & (sizeof(u64) - 1);  in __hsiphash_unaligned()
291 		v0 ^= m;  in __hsiphash_unaligned()
305 	case 1: b |= end[0];  in __hsiphash_unaligned()
313  * hsiphash_1u32 - compute 64-bit hsiphash PRF value of a u32
326  * hsiphash_2u32 - compute 32-bit hsiphash PRF value of 2 u32
337 	v0 ^= combined;  in hsiphash_2u32()
343  * hsiphash_3u32 - compute 32-bit hsiphash PRF value of 3 u32
356 	v0 ^= combined;  in hsiphash_3u32()
363  * hsiphash_4u32 - compute 32-bit hsiphash PRF value of 4 u32
377 	v0 ^= combined;  in hsiphash_4u32()
381 	v0 ^= combined;  in hsiphash_4u32()
386 #define HSIPROUND HSIPHASH_PERMUTATION(v0, v1, v2, v3)
389 	u32 v0 = HSIPHASH_CONST_0; \
394 	v3 ^= key->key[1]; \
395 	v2 ^= key->key[0]; \
396 	v1 ^= key->key[1]; \
397 	v0 ^= key->key[0];
402 	v0 ^= b; \
412 	const u8 *end = data + len - (len % sizeof(u32));  in __hsiphash_aligned()
413 	const u8 left = len & (sizeof(u32) - 1);  in __hsiphash_aligned()
420 		v0 ^= m;  in __hsiphash_aligned()
425 	case 1: b |= end[0];  in __hsiphash_aligned()
435 	const u8 *end = data + len - (len % sizeof(u32));  in __hsiphash_unaligned()
436 	const u8 left = len & (sizeof(u32) - 1);  in __hsiphash_unaligned()
443 		v0 ^= m;  in __hsiphash_unaligned()
448 	case 1: b |= end[0];  in __hsiphash_unaligned()
455  * hsiphash_1u32 - compute 32-bit hsiphash PRF value of a u32
464 	v0 ^= first;  in hsiphash_1u32()
470  * hsiphash_2u32 - compute 32-bit hsiphash PRF value of 2 u32
480 	v0 ^= first;  in hsiphash_2u32()
483 	v0 ^= second;  in hsiphash_2u32()
489  * hsiphash_3u32 - compute 32-bit hsiphash PRF value of 3 u32
501 	v0 ^= first;  in hsiphash_3u32()
504 	v0 ^= second;  in hsiphash_3u32()
507 	v0 ^= third;  in hsiphash_3u32()
513  * hsiphash_4u32 - compute 32-bit hsiphash PRF value of 4 u32
526 	v0 ^= first;  in hsiphash_4u32()
529 	v0 ^= second;  in hsiphash_4u32()
532 	v0 ^= third;  in hsiphash_4u32()
535 	v0 ^= forth;  in hsiphash_4u32()