diff options
Diffstat (limited to 'zaphod32_hash.h')
| -rw-r--r-- | zaphod32_hash.h | 287 |
1 files changed, 287 insertions, 0 deletions
diff --git a/zaphod32_hash.h b/zaphod32_hash.h new file mode 100644 index 0000000000..71a2faaec8 --- /dev/null +++ b/zaphod32_hash.h @@ -0,0 +1,287 @@ +#ifndef DEBUG_ZAPHOD32_HASH +#define DEBUG_ZAPHOD32_HASH 0 + +#if DEBUG_ZAPHOD32_HASH == 1 +#include <stdio.h> +#define ZAPHOD32_WARN6(pat,v0,v1,v2,v3,v4,v5) printf(pat, v0, v1, v2, v3, v4, v5) +#define ZAPHOD32_WARN5(pat,v0,v1,v2,v3,v4) printf(pat, v0, v1, v2, v3, v4) +#define ZAPHOD32_WARN4(pat,v0,v1,v2,v3) printf(pat, v0, v1, v2, v3) +#define ZAPHOD32_WARN3(pat,v0,v1,v2) printf(pat, v0, v1, v2) +#define ZAPHOD32_WARN2(pat,v0,v1) printf(pat, v0, v1) +#define NOTE3(pat,v0,v1,v2) printf(pat, v0, v1, v2) +#elif DEBUG_ZAPHOD32_HASH == 2 +#define ZAPHOD32_WARN6(pat,v0,v1,v2,v3,v4,v5) +#define ZAPHOD32_WARN5(pat,v0,v1,v2,v3,v4) +#define ZAPHOD32_WARN4(pat,v0,v1,v2,v3) +#define ZAPHOD32_WARN3(pat,v0,v1,v2) +#define ZAPHOD32_WARN2(pat,v0,v1) +#define NOTE3(pat,v0,v1,v2) printf(pat, v0, v1, v2) +#else +#define ZAPHOD32_WARN6(pat,v0,v1,v2,v3,v4,v5) +#define ZAPHOD32_WARN5(pat,v0,v1,v2,v3,v4) +#define ZAPHOD32_WARN4(pat,v0,v1,v2,v3) +#define ZAPHOD32_WARN3(pat,v0,v1,v2) +#define NOTE3(pat,v0,v1,v2) +#define ZAPHOD32_WARN2(pat,v0,v1) +#endif + +#ifndef ROTL32 +#define _ROTL_SIZED(x,r,s) ( ((x) << (r)) | ((x) >> ((s) - (r))) ) +#define _ROTR_SIZED(x,r,s) ( ((x) << ((s) - (r))) | ((x) >> (r)) ) +#define ROTL32(x,r) _ROTL_SIZED(x,r,32) +#define ROTR32(x,r) _ROTR_SIZED(x,r,32) +#endif + +#ifndef PERL_SEEN_HV_FUNC_H +#if !defined(U64) + #include <stdint.h> + #define U64 uint64_t +#endif + +#if !defined(U32) + #define U32 uint32_t +#endif + +#if !defined(U8) + #define U8 unsigned char +#endif + +#if !defined(U16) + #define U16 uint16_t +#endif + +#ifndef STRLEN +#define STRLEN int +#endif +#endif + +#ifndef ZAPHOD32_STATIC_INLINE +#ifdef PERL_STATIC_INLINE +#define ZAPHOD32_STATIC_INLINE PERL_STATIC_INLINE +#else +#define ZAPHOD32_STATIC_INLINE static inline +#endif +#endif + +#ifndef STMT_START +#define STMT_START do +#define STMT_END while(0) +#endif + +#ifndef U8TO64_LE +#define U8TO64_LE(ptr) (*((const U64 *)(ptr))) +#endif +#ifndef U8TO32_LE +#define U8TO32_LE(ptr) (*((const U32 *)(ptr))) +#endif +#ifndef U8TO16_LE +#define U8TO16_LE(ptr) (*((const U16 *)(ptr))) +#endif + +/* This is two marsaglia xor-shift permutes, with a prime-multiple + * sandwiched inside. The end result of doing this twice with different + * primes is a completely avalanched v. */ +#define ZAPHOD32_SCRAMBLE32(v,prime) STMT_START { \ + v ^= (v>>9); \ + v ^= (v<<21); \ + v ^= (v>>16); \ + v *= prime; \ + v ^= (v>>17); \ + v ^= (v<<15); \ + v ^= (v>>23); \ +} STMT_END + +#define ZAPHOD32_FINALIZE(v0,v1,v2) STMT_START { \ + ZAPHOD32_WARN3("v0=%08x v1=%08x v2=%08x - ZAPHOD32 FINALIZE\n", \ + (unsigned int)v0, (unsigned int)v1, (unsigned int)v2); \ + v2 += v0; \ + v1 -= v2; \ + v1 = ROTL32(v1, 6); \ + v2 ^= v1; \ + v2 = ROTL32(v2, 28); \ + v1 ^= v2; \ + v0 += v1; \ + v1 = ROTL32(v1, 24); \ + v2 += v1; \ + v2 = ROTL32(v2, 18) + v1; \ + v0 ^= v2; \ + v0 = ROTL32(v0, 20); \ + v2 += v0; \ + v1 ^= v2; \ + v0 += v1; \ + v0 = ROTL32(v0, 5); \ + v2 += v0; \ + v2 = ROTL32(v2, 22); \ + v0 -= v1; \ + v1 -= v2; \ + v1 = ROTL32(v1, 17); \ +} STMT_END + +#define ZAPHOD32_MIX(v0,v1,v2,text) STMT_START { \ + ZAPHOD32_WARN4("v0=%08x v1=%08x v2=%08x - ZAPHOD32 %s MIX\n", \ + (unsigned int)v0,(unsigned int)v1,(unsigned int)v2, text ); \ + v0 = ROTL32(v0,16) - v2; \ + v1 = ROTR32(v1,13) ^ v2; \ + v2 = ROTL32(v2,17) + v1; \ + v0 = ROTR32(v0, 2) + v1; \ + v1 = ROTR32(v1,17) - v0; \ + v2 = ROTR32(v2, 7) ^ v0; \ +} STMT_END + + +ZAPHOD32_STATIC_INLINE +void zaphod32_seed_state ( + const U8 *seed_ch, + U8 *state_ch +) { + U32 *seed= (U32 *)seed_ch; + U32 *state= (U32 *)state_ch; + + /* hex expansion of pi, skipping first two digits. pi= 3.2[43f6...]*/ + /* pi value in hex from here: + * http://turner.faculty.swau.edu/mathematics/materialslibrary/pi/pibases.html*/ + /* Ensure that the three state vectors are nonzero regardless of the seed. */ + /* The idea of these two steps is to ensure that the 0 state comes from a seed + * utterly unlike that of the value we replace it with.*/ + state[0]= seed[0] ^ 0x43f6a888; + state[1]= seed[1] ^ 0x5a308d31; + state[2]= seed[2] ^ 0x3198a2e0; + if (!state[0]) state[0] = 1; + if (!state[1]) state[1] = 2; + if (!state[2]) state[2] = 4; + /* these are pseduo-randomly selected primes between 2**31 and 2**32 + * (I generated a big list and then randomly chose some from the list) */ + ZAPHOD32_SCRAMBLE32(state[0],0x9fade23b); + ZAPHOD32_SCRAMBLE32(state[1],0xaa6f908d); + ZAPHOD32_SCRAMBLE32(state[2],0xcdf6b72d); + /* now that we have scrambled we do some mixing to avalanche the + * state bits to gether */ + ZAPHOD32_MIX(state[0],state[1],state[2],"ZAPHOD32 SEED-STATE A 1/4"); + ZAPHOD32_MIX(state[0],state[1],state[2],"ZAPHOD32 SEED-STATE A 2/4"); + ZAPHOD32_MIX(state[0],state[1],state[2],"ZAPHOD32 SEED-STATE A 3/4"); + ZAPHOD32_MIX(state[0],state[1],state[2],"ZAPHOD32 SEED-STATE A 4/4"); + + /* and then scramble them again with different primes */ + ZAPHOD32_SCRAMBLE32(state[0],0xc95d22a9); + ZAPHOD32_SCRAMBLE32(state[1],0x8497242b); + ZAPHOD32_SCRAMBLE32(state[2],0x9c5cc4e9); + /* and one final mix */ + ZAPHOD32_MIX(state[0],state[1],state[2],"ZAPHOD32 SEED-STATE 3/3"); + ZAPHOD32_MIX(state[0],state[1],state[2],"ZAPHOD32 SEED-STATE 3/3"); + ZAPHOD32_MIX(state[0],state[1],state[2],"ZAPHOD32 SEED-STATE 3/3"); + ZAPHOD32_MIX(state[0],state[1],state[2],"ZAPHOD32 SEED-STATE 3/3"); + ZAPHOD32_MIX(state[0],state[1],state[2],"ZAPHOD32 SEED-STATE 3/3"); + + /* so now state contains 4 + ( 7 * 256 ) == 1796 U32's, which is 57472 bits */ + +} + +ZAPHOD32_STATIC_INLINE +U32 zaphod32_hash_with_state( + const U8 *state_ch, + const U8 *key, + const STRLEN key_len +) { + U32 *state= (U32 *)state_ch; + const U8 *end; + U32 len = key_len; + U32 v0= state[0]; + U32 v1= state[1]; + U32 v2= state[2] ^ (0xC41A7AB1 * (key_len + 1)); + + ZAPHOD32_WARN4("v0=%08x v1=%08x v2=%08x ln=%08x HASH START\n", + (unsigned int)state[0], (unsigned int)state[1], + (unsigned int)state[2], (unsigned int)key_len); + { + switch (len) { + default: goto zaphod32_read8; + case 12: v2 += (U32)key[11] << 24; + case 11: v2 += (U32)key[10] << 16; + case 10: v2 += (U32)U8TO16_LE(key+8); + v1 -= U8TO32_LE(key+4); + v0 += U8TO32_LE(key+0); + goto zaphod32_finalize; + case 9: v2 += (U32)key[8]; + case 8: v1 -= U8TO32_LE(key+4); + v0 += U8TO32_LE(key+0); + goto zaphod32_finalize; + case 7: v2 += (U32)key[6]; + case 6: v0 += (U32)U8TO16_LE(key+4); + v1 -= U8TO32_LE(key+0); + goto zaphod32_finalize; + case 5: v0 += (U32)key[4]; + case 4: v1 -= U8TO32_LE(key+0); + goto zaphod32_finalize; + case 3: v2 += (U32)key[2]; + case 2: v0 += (U32)U8TO16_LE(key); + break; + case 1: v0 += (U32)key[0]; + break; + case 0: v2 ^= 0xFF; + break; + + } + v0 -= v2; + v2 = ROTL32(v2, 8) ^ v0; + v0 = ROTR32(v0,16) + v2; + v2 += v0; + v0 += v0 >> 9; + v0 += v2; + v2 ^= v0; + v2 += v2 << 4; + v0 -= v2; + v2 = ROTR32(v2, 8) ^ v0; + v0 = ROTL32(v0,16) ^ v2; + v2 = ROTL32(v2,10) + v0; + v0 = ROTR32(v0,30) + v2; + v2 = ROTR32(v2,12); + return v0 ^ v2; + } + + if (len >= 8) { +zaphod32_read8: + len = key_len & 0x7; + end = key + key_len - len; + do { + v1 -= U8TO32_LE(key+0); + v0 += U8TO32_LE(key+4); + ZAPHOD32_MIX(v0,v1,v2,"MIX 2-WORDS A"); + key += 8; + } while ( key < end ); + } + + if ( len >= 4 ) { + v1 -= U8TO32_LE(key); + key += 4; + } + + v0 += (U32)(key_len) << 24; + switch (len & 0x3) { + case 3: v2 += (U32)key[2]; + case 2: v0 += (U32)U8TO16_LE(key); + break; + case 1: v0 += (U32)key[0]; + break; + case 0: v2 ^= 0xFF; + } +zaphod32_finalize: + ZAPHOD32_FINALIZE(v0,v1,v2); + + ZAPHOD32_WARN4("v0=%08x v1=%08x v2=%08x hh=%08x - FINAL\n\n", + (unsigned int)v0, (unsigned int)v1, (unsigned int)v2, + (unsigned int)v0 ^ v1 ^ v2); + + return v0 ^ v1 ^ v2; +} + +ZAPHOD32_STATIC_INLINE U32 zaphod32_hash( + const U8 *seed_ch, + const U8 *key, + const STRLEN key_len +) { + U32 state[1796]; + zaphod32_seed_state(seed_ch,(U8*)state); + return zaphod32_hash_with_state((U8*)state,key,key_len); +} + +#endif |