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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 | ||
| 8 | ||
| 9 | #ifndef ROTL64 | |
| 10 | #define _ROTL_SIZED(x,r,s) ( ((x) << (r)) | ((x) >> ((s) - (r))) ) | |
| 11 | #define _ROTR_SIZED(x,r,s) ( ((x) << ((s) - (r))) | ((x) >> (r)) ) | |
| 12 | #define ROTL64(x,r) _ROTL_SIZED(x,r,64) | |
| 13 | #define ROTR64(x,r) _ROTR_SIZED(x,r,64) | |
| 14 | #endif | |
| 15 | ||
| 16 | #ifndef PERL_SEEN_HV_FUNC_H | |
| 17 | ||
| 18 | #if !defined(U64) | |
| 19 | #include <stdint.h> | |
| 20 | #define U64 uint64_t | |
| 21 | #endif | |
| 22 | ||
| 23 | #if !defined(U32) | |
| 24 | #define U32 uint32_t | |
| 25 | #endif | |
| 26 | ||
| 27 | #if !defined(U8) | |
| 28 | #define U8 unsigned char | |
| 29 | #endif | |
| 30 | ||
| 31 | #if !defined(U16) | |
| 32 | #define U16 uint16_t | |
| 33 | #endif | |
| 34 | ||
| 35 | #ifndef STRLEN | |
| 36 | #define STRLEN int | |
| 37 | #endif | |
| 38 | #endif | |
| 39 | ||
| 40 | #ifndef STADTX_STATIC_INLINE | |
| 41 | #ifdef PERL_STATIC_INLINE | |
| 42 | #define STADTX_STATIC_INLINE PERL_STATIC_INLINE | |
| 43 | #else | |
| 44 | #define STADTX_STATIC_INLINE static inline | |
| 45 | #endif | |
| 46 | #endif | |
| 47 | ||
| 48 | #ifndef STMT_START | |
| 49 | #define STMT_START do | |
| 50 | #define STMT_END while(0) | |
| 51 | #endif | |
| 52 | ||
| 53 | #ifndef STADTX_UNALIGNED_AND_LITTLE_ENDIAN | |
| 54 | #define STADTX_UNALIGNED_AND_LITTLE_ENDIAN 1 | |
| 55 | #endif | |
| 56 | ||
| 57 | #if STADTX_ALLOW_UNALIGNED_AND_LITTLE_ENDIAN | |
| 58 | #ifndef U8TO64_LE | |
| 59 | #define U8TO64_LE(ptr) (*((const U64 *)(ptr))) | |
| 60 | #endif | |
| 61 | #ifndef U8TO32_LE | |
| 62 | #define U8TO32_LE(ptr) (*((const U32 *)(ptr))) | |
| 63 | #endif | |
| 64 | #ifndef U8TO16_LE | |
| 65 | #define U8TO16_LE(ptr) (*((const U16 *)(ptr))) | |
| 66 | #endif | |
| 67 | #else | |
| 68 | #ifndef U8TO64_LE | |
| 69 | #define U8TO64_LE(ptr) (\ | |
| 70 | (U64)(ptr)[7] << 56 | \ | |
| 71 | (U64)(ptr)[6] << 48 | \ | |
| 72 | (U64)(ptr)[5] << 40 | \ | |
| 73 | (U64)(ptr)[4] << 32 | \ | |
| 74 | (U64)(ptr)[3] << 24 | \ | |
| 75 | (U64)(ptr)[2] << 16 | \ | |
| 76 | (U64)(ptr)[1] << 8 | \ | |
| 77 | (U64)(ptr)[0] \ | |
| 78 | ) | |
| 79 | #endif | |
| 80 | #ifndef U8TO32_LE | |
| 81 | #define U8TO32_LE(ptr) (\ | |
| 82 | (U32)(ptr)[3] << 24 | \ | |
| 83 | (U32)(ptr)[2] << 16 | \ | |
| 84 | (U32)(ptr)[1] << 8 | \ | |
| 85 | (U32)(ptr)[0] \ | |
| 86 | ) | |
| 87 | #endif | |
| 88 | #ifndef U8TO16_LE | |
| 89 | #define U8TO16_LE(ptr) (\ | |
| 90 | (U16)(ptr)[1] << 8 | \ | |
| 91 | (U16)(ptr)[0] \ | |
| 92 | ) | |
| 93 | #endif | |
| 94 | #endif | |
| 95 | ||
| 96 | /* do a marsaglia xor-shift permutation followed by a | |
| 97 | * multiply by a prime (presumably large) and another | |
| 98 | * marsaglia xor-shift permutation. | |
| 99 | * One of these thoroughly changes the bits of the input. | |
| 100 | * Two of these with different primes passes the Strict Avalanche Criteria | |
| 101 | * in all the tests I did. | |
| 102 | * | |
| 103 | * Note that v cannot end up zero after a scramble64 unless it | |
| 104 | * was zero in the first place. | |
| 105 | */ | |
| 106 | #define STADTX_SCRAMBLE64(v,prime) STMT_START { \ | |
| 107 | v ^= (v >> 13); \ | |
| 108 | v ^= (v << 35); \ | |
| 109 | v ^= (v >> 30); \ | |
| 110 | v *= prime; \ | |
| 111 | v ^= (v >> 19); \ | |
| 112 | v ^= (v << 15); \ | |
| 113 | v ^= (v >> 46); \ | |
| 114 | } STMT_END | |
| 115 | ||
| 116 | ||
| 117 | STADTX_STATIC_INLINE void stadtx_seed_state ( | |
| 118 | const U8 *seed_ch, | |
| 119 | U8 *state_ch | |
| 120 | ) { | |
| 121 | U64 *seed= (U64 *)seed_ch; | |
| 122 | U64 *state= (U64 *)state_ch; | |
| 123 | /* first we apply two masks to each word of the seed, this means that | |
| 124 | * a) at least one of state[0] and state[2] is nonzero, | |
| 125 | * b) at least one of state[1] and state[3] is nonzero | |
| 126 | * c) that state[0] and state[2] are different | |
| 127 | * d) that state[1] and state[3] are different | |
| 128 | * e) that the replacement value for any zero's is a totally different from the seed value. | |
| 129 | * (iow, if seed[0] is 0x43f6a8885a308d31UL then state[0] becomes 0, which is the replaced | |
| 130 | * with 1, which is totally different.). */ | |
| 131 | /* hex expansion of pi, skipping first two digits. pi= 3.2[43f6...]*/ | |
| 132 | /* pi value in hex from here: | |
| 133 | * http://turner.faculty.swau.edu/mathematics/materialslibrary/pi/pibases.html*/ | |
| 134 | state[0]= seed[0] ^ 0x43f6a8885a308d31UL; | |
| 135 | state[1]= seed[1] ^ 0x3198a2e03707344aUL; | |
| 136 | state[2]= seed[0] ^ 0x4093822299f31d00UL; | |
| 137 | state[3]= seed[1] ^ 0x82efa98ec4e6c894UL; | |
| 138 | if (!state[0]) state[0]=1; | |
| 139 | if (!state[1]) state[1]=2; | |
| 140 | if (!state[2]) state[2]=4; | |
| 141 | if (!state[3]) state[3]=8; | |
| 142 | /* and now for good measure we double scramble all four - | |
| 143 | * a double scramble guarantees a complete avalanche of all the | |
| 144 | * bits in the seed - IOW, by the time we are hashing the | |
| 145 | * four state vectors should be completely different and utterly | |
| 146 | * uncognizable from the input seed bits */ | |
| 147 | STADTX_SCRAMBLE64(state[0],0x801178846e899d17UL); | |
| 148 | STADTX_SCRAMBLE64(state[0],0xdd51e5d1c9a5a151UL); | |
| 149 | STADTX_SCRAMBLE64(state[1],0x93a7d6c8c62e4835UL); | |
| 150 | STADTX_SCRAMBLE64(state[1],0x803340f36895c2b5UL); | |
| 151 | STADTX_SCRAMBLE64(state[2],0xbea9344eb7565eebUL); | |
| 152 | STADTX_SCRAMBLE64(state[2],0xcd95d1e509b995cdUL); | |
| 153 | STADTX_SCRAMBLE64(state[3],0x9999791977e30c13UL); | |
| 154 | STADTX_SCRAMBLE64(state[3],0xaab8b6b05abfc6cdUL); | |
| 155 | } | |
| 156 | ||
| 157 | #define STADTX_K0_U64 0xb89b0f8e1655514fUL | |
| 158 | #define STADTX_K1_U64 0x8c6f736011bd5127UL | |
| 159 | #define STADTX_K2_U64 0x8f29bd94edce7b39UL | |
| 160 | #define STADTX_K3_U64 0x9c1b8e1e9628323fUL | |
| 161 | ||
| 162 | #define STADTX_K2_U32 0x802910e3 | |
| 163 | #define STADTX_K3_U32 0x819b13af | |
| 164 | #define STADTX_K4_U32 0x91cb27e5 | |
| 165 | #define STADTX_K5_U32 0xc1a269c1 | |
| 166 | ||
| 167 | STADTX_STATIC_INLINE U64 stadtx_hash_with_state( | |
| 168 | const U8 *state_ch, | |
| 169 | const U8 *key, | |
| 170 | const STRLEN key_len | |
| 171 | ) { | |
| 172 | U64 *state= (U64 *)state_ch; | |
| 173 | U64 len = key_len; | |
| 174 | U64 v0= state[0] ^ ((key_len+1) * STADTX_K0_U64); | |
| 175 | U64 v1= state[1] ^ ((key_len+2) * STADTX_K1_U64); | |
| 176 | if (len < 32) { | |
| 177 | switch(len >> 3) { | |
| 178 | case 3: | |
| 179 | v0 += U8TO64_LE(key) * STADTX_K3_U64; | |
| 180 | v0= ROTR64(v0, 17) ^ v1; | |
| 181 | v1= ROTR64(v1, 53) + v0; | |
| 182 | key += 8; | |
| 183 | case 2: | |
| 184 | v0 += U8TO64_LE(key) * STADTX_K3_U64; | |
| 185 | v0= ROTR64(v0, 17) ^ v1; | |
| 186 | v1= ROTR64(v1, 53) + v0; | |
| 187 | key += 8; | |
| 188 | case 1: | |
| 189 | v0 += U8TO64_LE(key) * STADTX_K3_U64; | |
| 190 | v0= ROTR64(v0, 17) ^ v1; | |
| 191 | v1= ROTR64(v1, 53) + v0; | |
| 192 | key += 8; | |
| 193 | case 0: | |
| 194 | default: break; | |
| 195 | } | |
| 196 | switch ( len & 0x7 ) { | |
| 197 | case 7: v0 += (U64)key[6] << 32; | |
| 198 | case 6: v1 += (U64)key[5] << 48; | |
| 199 | case 5: v0 += (U64)key[4] << 16; | |
| 200 | case 4: v1 += (U64)U8TO32_LE(key); | |
| 201 | break; | |
| 202 | case 3: v0 += (U64)key[2] << 48; | |
| 203 | case 2: v1 += (U64)U8TO16_LE(key); | |
| 204 | break; | |
| 205 | case 1: v0 += (U64)key[0]; | |
| 206 | case 0: v1 = ROTL64(v1, 32) ^ 0xFF; | |
| 207 | break; | |
| 208 | } | |
| 209 | v1 ^= v0; | |
| 210 | v0 = ROTR64(v0,33) + v1; | |
| 211 | v1 = ROTL64(v1,17) ^ v0; | |
| 212 | v0 = ROTL64(v0,43) + v1; | |
| 213 | v1 = ROTL64(v1,31) - v0; | |
| 214 | v0 = ROTL64(v0,13) ^ v1; | |
| 215 | v1 -= v0; | |
| 216 | v0 = ROTL64(v0,41) + v1; | |
| 217 | v1 = ROTL64(v1,37) ^ v0; | |
| 218 | v0 = ROTR64(v0,39) + v1; | |
| 219 | v1 = ROTR64(v1,15) + v0; | |
| 220 | v0 = ROTL64(v0,15) ^ v1; | |
| 221 | v1 = ROTR64(v1, 5); | |
| 222 | return v0 ^ v1; | |
| 223 | } else { | |
| 224 | U64 v2= state[2] ^ ((key_len+3) * STADTX_K2_U64); | |
| 225 | U64 v3= state[3] ^ ((key_len+4) * STADTX_K3_U64); | |
| 226 | ||
| 227 | do { | |
| 228 | v0 += (U64)U8TO64_LE(key+ 0) * STADTX_K2_U32; v0= ROTL64(v0,57) ^ v3; | |
| 229 | v1 += (U64)U8TO64_LE(key+ 8) * STADTX_K3_U32; v1= ROTL64(v1,63) ^ v2; | |
| 230 | v2 += (U64)U8TO64_LE(key+16) * STADTX_K4_U32; v2= ROTR64(v2,47) + v0; | |
| 231 | v3 += (U64)U8TO64_LE(key+24) * STADTX_K5_U32; v3= ROTR64(v3,11) - v1; | |
| 232 | key += 32; | |
| 233 | len -= 32; | |
| 234 | } while ( len >= 32 ); | |
| 235 | ||
| 236 | switch ( len >> 3 ) { | |
| 237 | case 3: v0 += ((U64)U8TO64_LE(key) * STADTX_K2_U32); key += 8; v0= ROTL64(v0,57) ^ v3; | |
| 238 | case 2: v1 += ((U64)U8TO64_LE(key) * STADTX_K3_U32); key += 8; v1= ROTL64(v1,63) ^ v2; | |
| 239 | case 1: v2 += ((U64)U8TO64_LE(key) * STADTX_K4_U32); key += 8; v2= ROTR64(v2,47) + v0; | |
| 240 | case 0: v3 = ROTR64(v3,11) - v1; | |
| 241 | } | |
| 242 | v0 ^= (len+1) * STADTX_K3_U64; | |
| 243 | switch ( len & 0x7 ) { | |
| 244 | case 7: v1 += (U64)key[6]; | |
| 245 | case 6: v2 += (U64)U8TO16_LE(key+4); | |
| 246 | v3 += (U64)U8TO32_LE(key); | |
| 247 | break; | |
| 248 | case 5: v1 += (U64)key[4]; | |
| 249 | case 4: v2 += (U64)U8TO32_LE(key); | |
| 250 | break; | |
| 251 | case 3: v3 += (U64)key[2]; | |
| 252 | case 2: v1 += (U64)U8TO16_LE(key); | |
| 253 | break; | |
| 254 | case 1: v2 += (U64)key[0]; | |
| 255 | case 0: v3 = ROTL64(v3, 32) ^ 0xFF; | |
| 256 | break; | |
| 257 | } | |
| 258 | ||
| 259 | v1 -= v2; | |
| 260 | v0 = ROTR64(v0,19); | |
| 261 | v1 -= v0; | |
| 262 | v1 = ROTR64(v1,53); | |
| 263 | v3 ^= v1; | |
| 264 | v0 -= v3; | |
| 265 | v3 = ROTL64(v3,43); | |
| 266 | v0 += v3; | |
| 267 | v0 = ROTR64(v0, 3); | |
| 268 | v3 -= v0; | |
| 269 | v2 = ROTR64(v2,43) - v3; | |
| 270 | v2 = ROTL64(v2,55) ^ v0; | |
| 271 | v1 -= v2; | |
| 272 | v3 = ROTR64(v3, 7) - v2; | |
| 273 | v2 = ROTR64(v2,31); | |
| 274 | v3 += v2; | |
| 275 | v2 -= v1; | |
| 276 | v3 = ROTR64(v3,39); | |
| 277 | v2 ^= v3; | |
| 278 | v3 = ROTR64(v3,17) ^ v2; | |
| 279 | v1 += v3; | |
| 280 | v1 = ROTR64(v1, 9); | |
| 281 | v2 ^= v1; | |
| 282 | v2 = ROTL64(v2,24); | |
| 283 | v3 ^= v2; | |
| 284 | v3 = ROTR64(v3,59); | |
| 285 | v0 = ROTR64(v0, 1) - v1; | |
| 286 | ||
| 287 | return v0 ^ v1 ^ v2 ^ v3; | |
| 288 | } | |
| 289 | } | |
| 290 | ||
| 291 | STADTX_STATIC_INLINE U64 stadtx_hash( | |
| 292 | const U8 *seed_ch, | |
| 293 | const U8 *key, | |
| 294 | const STRLEN key_len | |
| 295 | ) { | |
| 296 | U64 state[4]; | |
| 297 | stadtx_seed_state(seed_ch,(U8*)state); | |
| 298 | return stadtx_hash_with_state((U8*)state,key,key_len); | |
| 299 | } | |
| 300 | ||
| 301 | #endif |