mirror of
https://github.com/telekom-security/tpotce.git
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98 lines
2 KiB
C
98 lines
2 KiB
C
/*
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p0f - a port of lookup3
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-----------------------
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The hash32() function is a modified copy of lookup3, a good non-cryptosafe
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seeded hashing function developed by Bob Jenkins.
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Bob's original code is public domain; so is this variant.
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*/
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#ifndef _HAVE_HASH_H
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#define _HAVE_HASH_H
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#include "types.h"
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#define ROL32(_x, _r) (((_x) << (_r)) | ((_x) >> (32 - (_r))))
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static inline u32 hash32(const void* key, u32 len, u32 seed) {
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u32 a, b, c;
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const u8* k = key;
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a = b = c = 0xdeadbeef + len + seed;
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while (len > 12) {
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a += RD32p(k);
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b += RD32p(k + 4);
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c += RD32p(k + 8);
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a -= c; a ^= ROL32(c, 4); c += b;
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b -= a; b ^= ROL32(a, 6); a += c;
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c -= b; c ^= ROL32(b, 8); b += a;
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a -= c; a ^= ROL32(c, 16); c += b;
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b -= a; b ^= ROL32(a, 19); a += c;
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c -= b; c ^= ROL32(b, 4); b += a;
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len -= 12;
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k += 12;
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}
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switch (len) {
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case 12: c += RD32p(k + 8);
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b += RD32p(k+ 4);
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a += RD32p(k); break;
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case 11: c += (RD16p(k + 8) << 8) | k[10];
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b += RD32p(k + 4);
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a += RD32p(k); break;
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case 10: c += RD16p(k + 8);
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b += RD32p(k + 4);
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a += RD32p(k); break;
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case 9: c += k[8];
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b += RD32p(k + 4);
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a += RD32p(k); break;
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case 8: b += RD32p(k + 4);
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a += RD32p(k); break;
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case 7: b += (RD16p(k + 4) << 8) | k[6] ;
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a += RD32p(k); break;
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case 6: b += RD16p(k + 4);
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a += RD32p(k); break;
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case 5: b += k[4];
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a += RD32p(k); break;
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case 4: a += RD32p(k); break;
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case 3: a += (RD16p(k) << 8) | k[2]; break;
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case 2: a += RD16p(k); break;
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case 1: a += k[0]; break;
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case 0: return c;
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}
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c ^= b; c -= ROL32(b, 14);
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a ^= c; a -= ROL32(c, 11);
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b ^= a; b -= ROL32(a, 25);
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c ^= b; c -= ROL32(b, 16);
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a ^= c; a -= ROL32(c, 4);
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b ^= a; b -= ROL32(a, 14);
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c ^= b; c -= ROL32(b, 24);
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return c;
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}
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#endif /* !_HAVE_HASH_H */
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