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9d5e3f1a YO |
1 | #ifndef STADTX_HASH_H |
2 | #define STADTX_HASH_H | |
3 | ||
4 | #ifndef DEBUG_STADTX_HASH | |
5 | #define DEBUG_STADTX_HASH 0 | |
6 | #endif | |
7 | ||
9d5e3f1a YO |
8 | #ifndef PERL_SEEN_HV_FUNC_H |
9 | ||
10 | #if !defined(U64) | |
11 | #include <stdint.h> | |
12 | #define U64 uint64_t | |
13 | #endif | |
14 | ||
15 | #if !defined(U32) | |
16 | #define U32 uint32_t | |
17 | #endif | |
18 | ||
19 | #if !defined(U8) | |
20 | #define U8 unsigned char | |
21 | #endif | |
22 | ||
23 | #if !defined(U16) | |
24 | #define U16 uint16_t | |
25 | #endif | |
26 | ||
27 | #ifndef STRLEN | |
28 | #define STRLEN int | |
29 | #endif | |
d939098c | 30 | |
9d5e3f1a YO |
31 | #endif |
32 | ||
33 | #ifndef STADTX_STATIC_INLINE | |
34 | #ifdef PERL_STATIC_INLINE | |
35 | #define STADTX_STATIC_INLINE PERL_STATIC_INLINE | |
36 | #else | |
37 | #define STADTX_STATIC_INLINE static inline | |
38 | #endif | |
39 | #endif | |
40 | ||
41 | #ifndef STMT_START | |
42 | #define STMT_START do | |
43 | #define STMT_END while(0) | |
44 | #endif | |
45 | ||
d939098c YO |
46 | /* Find best way to ROTL32/ROTL64 */ |
47 | #if defined(_MSC_VER) | |
48 | #include <stdlib.h> /* Microsoft put _rotl declaration in here */ | |
49 | #define ROTL32(x,r) _rotl(x,r) | |
50 | #define ROTR32(x,r) _rotr(x,r) | |
51 | #define ROTL64(x,r) _rotl64(x,r) | |
52 | #define ROTR64(x,r) _rotr64(x,r) | |
53 | #else | |
54 | /* gcc recognises this code and generates a rotate instruction for CPUs with one */ | |
55 | #define ROTL32(x,r) (((U32)(x) << (r)) | ((U32)(x) >> (32 - (r)))) | |
56 | #define ROTR32(x,r) (((U32)(x) << (32 - (r))) | ((U32)(x) >> (r))) | |
57 | #define ROTL64(x,r) ( ( (U64)(x) << (r) ) | ( (U64)(x) >> ( 64 - (r) ) ) ) | |
58 | #define ROTR64(x,r) ( ( (U64)(x) << ( 64 - (r) ) ) | ( (U64)(x) >> (r) ) ) | |
59 | #endif | |
60 | ||
9d5e3f1a YO |
61 | |
62 | /* do a marsaglia xor-shift permutation followed by a | |
63 | * multiply by a prime (presumably large) and another | |
64 | * marsaglia xor-shift permutation. | |
65 | * One of these thoroughly changes the bits of the input. | |
66 | * Two of these with different primes passes the Strict Avalanche Criteria | |
67 | * in all the tests I did. | |
68 | * | |
69 | * Note that v cannot end up zero after a scramble64 unless it | |
70 | * was zero in the first place. | |
71 | */ | |
72 | #define STADTX_SCRAMBLE64(v,prime) STMT_START { \ | |
73 | v ^= (v >> 13); \ | |
74 | v ^= (v << 35); \ | |
75 | v ^= (v >> 30); \ | |
76 | v *= prime; \ | |
77 | v ^= (v >> 19); \ | |
78 | v ^= (v << 15); \ | |
79 | v ^= (v >> 46); \ | |
80 | } STMT_END | |
81 | ||
82 | ||
83 | STADTX_STATIC_INLINE void stadtx_seed_state ( | |
84 | const U8 *seed_ch, | |
85 | U8 *state_ch | |
86 | ) { | |
20e4c2ed | 87 | const U64 *seed= (const U64 *)seed_ch; |
9d5e3f1a YO |
88 | U64 *state= (U64 *)state_ch; |
89 | /* first we apply two masks to each word of the seed, this means that | |
90 | * a) at least one of state[0] and state[2] is nonzero, | |
91 | * b) at least one of state[1] and state[3] is nonzero | |
92 | * c) that state[0] and state[2] are different | |
93 | * d) that state[1] and state[3] are different | |
94 | * e) that the replacement value for any zero's is a totally different from the seed value. | |
95 | * (iow, if seed[0] is 0x43f6a8885a308d31UL then state[0] becomes 0, which is the replaced | |
96 | * with 1, which is totally different.). */ | |
97 | /* hex expansion of pi, skipping first two digits. pi= 3.2[43f6...]*/ | |
98 | /* pi value in hex from here: | |
99 | * http://turner.faculty.swau.edu/mathematics/materialslibrary/pi/pibases.html*/ | |
d68aa7aa JH |
100 | state[0]= seed[0] ^ UINT64_C(0x43f6a8885a308d31); |
101 | state[1]= seed[1] ^ UINT64_C(0x3198a2e03707344a); | |
102 | state[2]= seed[0] ^ UINT64_C(0x4093822299f31d00); | |
103 | state[3]= seed[1] ^ UINT64_C(0x82efa98ec4e6c894); | |
9d5e3f1a YO |
104 | if (!state[0]) state[0]=1; |
105 | if (!state[1]) state[1]=2; | |
106 | if (!state[2]) state[2]=4; | |
107 | if (!state[3]) state[3]=8; | |
108 | /* and now for good measure we double scramble all four - | |
109 | * a double scramble guarantees a complete avalanche of all the | |
110 | * bits in the seed - IOW, by the time we are hashing the | |
111 | * four state vectors should be completely different and utterly | |
112 | * uncognizable from the input seed bits */ | |
d68aa7aa JH |
113 | STADTX_SCRAMBLE64(state[0],UINT64_C(0x801178846e899d17)); |
114 | STADTX_SCRAMBLE64(state[0],UINT64_C(0xdd51e5d1c9a5a151)); | |
115 | STADTX_SCRAMBLE64(state[1],UINT64_C(0x93a7d6c8c62e4835)); | |
116 | STADTX_SCRAMBLE64(state[1],UINT64_C(0x803340f36895c2b5)); | |
117 | STADTX_SCRAMBLE64(state[2],UINT64_C(0xbea9344eb7565eeb)); | |
118 | STADTX_SCRAMBLE64(state[2],UINT64_C(0xcd95d1e509b995cd)); | |
119 | STADTX_SCRAMBLE64(state[3],UINT64_C(0x9999791977e30c13)); | |
120 | STADTX_SCRAMBLE64(state[3],UINT64_C(0xaab8b6b05abfc6cd)); | |
9d5e3f1a YO |
121 | } |
122 | ||
d68aa7aa JH |
123 | #define STADTX_K0_U64 UINT64_C(0xb89b0f8e1655514f) |
124 | #define STADTX_K1_U64 UINT64_C(0x8c6f736011bd5127) | |
125 | #define STADTX_K2_U64 UINT64_C(0x8f29bd94edce7b39) | |
126 | #define STADTX_K3_U64 UINT64_C(0x9c1b8e1e9628323f) | |
9d5e3f1a YO |
127 | |
128 | #define STADTX_K2_U32 0x802910e3 | |
129 | #define STADTX_K3_U32 0x819b13af | |
130 | #define STADTX_K4_U32 0x91cb27e5 | |
131 | #define STADTX_K5_U32 0xc1a269c1 | |
132 | ||
133 | STADTX_STATIC_INLINE U64 stadtx_hash_with_state( | |
134 | const U8 *state_ch, | |
135 | const U8 *key, | |
136 | const STRLEN key_len | |
137 | ) { | |
138 | U64 *state= (U64 *)state_ch; | |
9995b99e | 139 | STRLEN len = key_len; |
9d5e3f1a YO |
140 | U64 v0= state[0] ^ ((key_len+1) * STADTX_K0_U64); |
141 | U64 v1= state[1] ^ ((key_len+2) * STADTX_K1_U64); | |
142 | if (len < 32) { | |
143 | switch(len >> 3) { | |
144 | case 3: | |
145 | v0 += U8TO64_LE(key) * STADTX_K3_U64; | |
146 | v0= ROTR64(v0, 17) ^ v1; | |
147 | v1= ROTR64(v1, 53) + v0; | |
148 | key += 8; | |
b2733f8f | 149 | /* FALLTHROUGH */ |
9d5e3f1a YO |
150 | case 2: |
151 | v0 += U8TO64_LE(key) * STADTX_K3_U64; | |
152 | v0= ROTR64(v0, 17) ^ v1; | |
153 | v1= ROTR64(v1, 53) + v0; | |
154 | key += 8; | |
b2733f8f | 155 | /* FALLTHROUGH */ |
9d5e3f1a YO |
156 | case 1: |
157 | v0 += U8TO64_LE(key) * STADTX_K3_U64; | |
158 | v0= ROTR64(v0, 17) ^ v1; | |
159 | v1= ROTR64(v1, 53) + v0; | |
160 | key += 8; | |
b2733f8f | 161 | /* FALLTHROUGH */ |
9d5e3f1a YO |
162 | case 0: |
163 | default: break; | |
164 | } | |
165 | switch ( len & 0x7 ) { | |
166 | case 7: v0 += (U64)key[6] << 32; | |
b2733f8f | 167 | /* FALLTHROUGH */ |
9d5e3f1a | 168 | case 6: v1 += (U64)key[5] << 48; |
b2733f8f | 169 | /* FALLTHROUGH */ |
9d5e3f1a | 170 | case 5: v0 += (U64)key[4] << 16; |
b2733f8f | 171 | /* FALLTHROUGH */ |
9d5e3f1a YO |
172 | case 4: v1 += (U64)U8TO32_LE(key); |
173 | break; | |
174 | case 3: v0 += (U64)key[2] << 48; | |
b2733f8f | 175 | /* FALLTHROUGH */ |
9d5e3f1a YO |
176 | case 2: v1 += (U64)U8TO16_LE(key); |
177 | break; | |
178 | case 1: v0 += (U64)key[0]; | |
b2733f8f | 179 | /* FALLTHROUGH */ |
9d5e3f1a YO |
180 | case 0: v1 = ROTL64(v1, 32) ^ 0xFF; |
181 | break; | |
182 | } | |
183 | v1 ^= v0; | |
184 | v0 = ROTR64(v0,33) + v1; | |
185 | v1 = ROTL64(v1,17) ^ v0; | |
186 | v0 = ROTL64(v0,43) + v1; | |
187 | v1 = ROTL64(v1,31) - v0; | |
188 | v0 = ROTL64(v0,13) ^ v1; | |
189 | v1 -= v0; | |
190 | v0 = ROTL64(v0,41) + v1; | |
191 | v1 = ROTL64(v1,37) ^ v0; | |
192 | v0 = ROTR64(v0,39) + v1; | |
193 | v1 = ROTR64(v1,15) + v0; | |
194 | v0 = ROTL64(v0,15) ^ v1; | |
195 | v1 = ROTR64(v1, 5); | |
196 | return v0 ^ v1; | |
197 | } else { | |
198 | U64 v2= state[2] ^ ((key_len+3) * STADTX_K2_U64); | |
199 | U64 v3= state[3] ^ ((key_len+4) * STADTX_K3_U64); | |
200 | ||
201 | do { | |
202 | v0 += (U64)U8TO64_LE(key+ 0) * STADTX_K2_U32; v0= ROTL64(v0,57) ^ v3; | |
203 | v1 += (U64)U8TO64_LE(key+ 8) * STADTX_K3_U32; v1= ROTL64(v1,63) ^ v2; | |
204 | v2 += (U64)U8TO64_LE(key+16) * STADTX_K4_U32; v2= ROTR64(v2,47) + v0; | |
205 | v3 += (U64)U8TO64_LE(key+24) * STADTX_K5_U32; v3= ROTR64(v3,11) - v1; | |
206 | key += 32; | |
207 | len -= 32; | |
208 | } while ( len >= 32 ); | |
209 | ||
210 | switch ( len >> 3 ) { | |
211 | case 3: v0 += ((U64)U8TO64_LE(key) * STADTX_K2_U32); key += 8; v0= ROTL64(v0,57) ^ v3; | |
b2733f8f | 212 | /* FALLTHROUGH */ |
9d5e3f1a | 213 | case 2: v1 += ((U64)U8TO64_LE(key) * STADTX_K3_U32); key += 8; v1= ROTL64(v1,63) ^ v2; |
b2733f8f | 214 | /* FALLTHROUGH */ |
9d5e3f1a | 215 | case 1: v2 += ((U64)U8TO64_LE(key) * STADTX_K4_U32); key += 8; v2= ROTR64(v2,47) + v0; |
b2733f8f | 216 | /* FALLTHROUGH */ |
9d5e3f1a | 217 | case 0: v3 = ROTR64(v3,11) - v1; |
b2733f8f | 218 | /* FALLTHROUGH */ |
9d5e3f1a YO |
219 | } |
220 | v0 ^= (len+1) * STADTX_K3_U64; | |
221 | switch ( len & 0x7 ) { | |
222 | case 7: v1 += (U64)key[6]; | |
b2733f8f | 223 | /* FALLTHROUGH */ |
9d5e3f1a YO |
224 | case 6: v2 += (U64)U8TO16_LE(key+4); |
225 | v3 += (U64)U8TO32_LE(key); | |
226 | break; | |
227 | case 5: v1 += (U64)key[4]; | |
b2733f8f | 228 | /* FALLTHROUGH */ |
9d5e3f1a YO |
229 | case 4: v2 += (U64)U8TO32_LE(key); |
230 | break; | |
231 | case 3: v3 += (U64)key[2]; | |
b2733f8f | 232 | /* FALLTHROUGH */ |
9d5e3f1a YO |
233 | case 2: v1 += (U64)U8TO16_LE(key); |
234 | break; | |
235 | case 1: v2 += (U64)key[0]; | |
b2733f8f | 236 | /* FALLTHROUGH */ |
9d5e3f1a YO |
237 | case 0: v3 = ROTL64(v3, 32) ^ 0xFF; |
238 | break; | |
239 | } | |
240 | ||
241 | v1 -= v2; | |
242 | v0 = ROTR64(v0,19); | |
243 | v1 -= v0; | |
244 | v1 = ROTR64(v1,53); | |
245 | v3 ^= v1; | |
246 | v0 -= v3; | |
247 | v3 = ROTL64(v3,43); | |
248 | v0 += v3; | |
249 | v0 = ROTR64(v0, 3); | |
250 | v3 -= v0; | |
251 | v2 = ROTR64(v2,43) - v3; | |
252 | v2 = ROTL64(v2,55) ^ v0; | |
253 | v1 -= v2; | |
254 | v3 = ROTR64(v3, 7) - v2; | |
255 | v2 = ROTR64(v2,31); | |
256 | v3 += v2; | |
257 | v2 -= v1; | |
258 | v3 = ROTR64(v3,39); | |
259 | v2 ^= v3; | |
260 | v3 = ROTR64(v3,17) ^ v2; | |
261 | v1 += v3; | |
262 | v1 = ROTR64(v1, 9); | |
263 | v2 ^= v1; | |
264 | v2 = ROTL64(v2,24); | |
265 | v3 ^= v2; | |
266 | v3 = ROTR64(v3,59); | |
267 | v0 = ROTR64(v0, 1) - v1; | |
268 | ||
269 | return v0 ^ v1 ^ v2 ^ v3; | |
270 | } | |
271 | } | |
272 | ||
273 | STADTX_STATIC_INLINE U64 stadtx_hash( | |
274 | const U8 *seed_ch, | |
275 | const U8 *key, | |
276 | const STRLEN key_len | |
277 | ) { | |
278 | U64 state[4]; | |
279 | stadtx_seed_state(seed_ch,(U8*)state); | |
280 | return stadtx_hash_with_state((U8*)state,key,key_len); | |
281 | } | |
282 | ||
283 | #endif |