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/* Copyright (C) 2001-2005 by Hans Reiser, licensing governed by
reiser4progs/COPYING.
tea_hash.c -- tea hash implementation. */
#ifdef ENABLE_TEA_HASH
#include <reiser4/plugin.h>
#define FULLROUNDS 10
#define PARTROUNDS 6
#define DELTA 0x9E3779B9
#define tea_hash_core(rounds) \
do { \
uint64_t sum = 0; \
int n = rounds; \
uint64_t b0, b1; \
\
b0 = h0; \
b1 = h1; \
\
do { \
sum += DELTA; \
b0 += ((b1 << 4) + a) ^ (b1 + sum) ^ ((b1 >> 5) + b); \
b1 += ((b0 << 4) + c) ^ (b0 + sum) ^ ((b0 >> 5) + d); \
} while (--n); \
\
h0 += b0; \
h1 += b1; \
} while(0)
uint64_t tea_hash_build(unsigned char *name, uint32_t len) {
uint64_t k[] = { 0x9464a485, 0x542e1a94, 0x3e846bff, 0xb75bcfc3};
uint64_t i;
uint64_t pad;
uint64_t a, b, c, d;
uint64_t h0 = k[0], h1 = k[1];
pad = (uint64_t)len | ((uint64_t)len << 8);
pad |= pad << 16;
while(len >= 16) {
a = (uint64_t)name[0] |
(uint64_t)name[1] << 8 |
(uint64_t)name[2] << 16|
(uint64_t)name[3] << 24;
b = (uint64_t)name[4] |
(uint64_t)name[5] << 8 |
(uint64_t)name[6] << 16|
(uint64_t)name[7] << 24;
c = (uint64_t)name[8] |
(uint64_t)name[9] << 8 |
(uint64_t)name[10] << 16|
(uint64_t)name[11] << 24;
d = (uint64_t)name[12] |
(uint64_t)name[13] << 8 |
(uint64_t)name[14] << 16|
(uint64_t)name[15] << 24;
tea_hash_core(PARTROUNDS);
len -= 16;
name += 16;
}
if (len >= 12) {
if (len >= 16)
*(int *)0 = 0;
a = (uint64_t)name[ 0] |
(uint64_t)name[ 1] << 8 |
(uint64_t)name[ 2] << 16|
(uint64_t)name[ 3] << 24;
b = (uint64_t)name[ 4] |
(uint64_t)name[ 5] << 8 |
(uint64_t)name[ 6] << 16|
(uint64_t)name[ 7] << 24;
c = (uint64_t)name[ 8] |
(uint64_t)name[ 9] << 8 |
(uint64_t)name[10] << 16|
(uint64_t)name[11] << 24;
d = pad;
for(i = 12; i < len; i++) {
d <<= 8;
d |= name[i];
}
} else if (len >= 8) {
if (len >= 12)
*(int *)0 = 0;
a = (uint64_t)name[ 0] |
(uint64_t)name[ 1] << 8 |
(uint64_t)name[ 2] << 16|
(uint64_t)name[ 3] << 24;
b = (uint64_t)name[ 4] |
(uint64_t)name[ 5] << 8 |
(uint64_t)name[ 6] << 16|
(uint64_t)name[ 7] << 24;
c = d = pad;
for (i = 8; i < len; i++) {
c <<= 8;
c |= name[i];
}
} else if (len >= 4) {
if (len >= 8)
*(int *)0 = 0;
a = (uint64_t)name[ 0] |
(uint64_t)name[ 1] << 8 |
(uint64_t)name[ 2] << 16|
(uint64_t)name[ 3] << 24;
b = c = d = pad;
for (i = 4; i < len; i++) {
b <<= 8;
b |= name[i];
}
} else {
if (len >= 4)
*(int *)0 = 0;
a = b = c = d = pad;
for(i = 0; i < len; i++) {
a <<= 8;
a |= name[i];
}
}
tea_hash_core(FULLROUNDS);
return h0 ^ h1;
}
reiser4_hash_plug_t tea_hash_plug = {
.p = {
.id = {HASH_TEA_ID, 0, HASH_PLUG_TYPE},
#ifndef ENABLE_MINIMAL
.label = "tea_hash",
.desc = "Tea hash plugin.",
#endif
},
.build = tea_hash_build
};
#endif
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