1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
|
/*
+----------------------------------------------------------------------+
| PHP Version 7 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2015 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Michael Maclean <mgdm@php.net> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
/* Based on the public domain algorithm found at
http://www.isthe.com/chongo/tech/comp/fnv/index.html */
#include "php_hash.h"
#include "php_hash_fnv.h"
const php_hash_ops php_hash_fnv132_ops = {
(php_hash_init_func_t) PHP_FNV132Init,
(php_hash_update_func_t) PHP_FNV132Update,
(php_hash_final_func_t) PHP_FNV132Final,
(php_hash_copy_func_t) php_hash_copy,
4,
4,
sizeof(PHP_FNV132_CTX)
};
const php_hash_ops php_hash_fnv1a32_ops = {
(php_hash_init_func_t) PHP_FNV132Init,
(php_hash_update_func_t) PHP_FNV1a32Update,
(php_hash_final_func_t) PHP_FNV132Final,
(php_hash_copy_func_t) php_hash_copy,
4,
4,
sizeof(PHP_FNV132_CTX)
};
const php_hash_ops php_hash_fnv164_ops = {
(php_hash_init_func_t) PHP_FNV164Init,
(php_hash_update_func_t) PHP_FNV164Update,
(php_hash_final_func_t) PHP_FNV164Final,
(php_hash_copy_func_t) php_hash_copy,
8,
4,
sizeof(PHP_FNV164_CTX)
};
const php_hash_ops php_hash_fnv1a64_ops = {
(php_hash_init_func_t) PHP_FNV164Init,
(php_hash_update_func_t) PHP_FNV1a64Update,
(php_hash_final_func_t) PHP_FNV164Final,
(php_hash_copy_func_t) php_hash_copy,
8,
4,
sizeof(PHP_FNV164_CTX)
};
/* {{{ PHP_FNV132Init
* 32-bit FNV-1 hash initialisation
*/
PHP_HASH_API void PHP_FNV132Init(PHP_FNV132_CTX *context)
{
context->state = PHP_FNV1_32_INIT;
}
/* }}} */
PHP_HASH_API void PHP_FNV132Update(PHP_FNV132_CTX *context, const unsigned char *input,
unsigned int inputLen)
{
context->state = fnv_32_buf((void *)input, inputLen, context->state, 0);
}
PHP_HASH_API void PHP_FNV1a32Update(PHP_FNV132_CTX *context, const unsigned char *input,
unsigned int inputLen)
{
context->state = fnv_32_buf((void *)input, inputLen, context->state, 1);
}
PHP_HASH_API void PHP_FNV132Final(unsigned char digest[4], PHP_FNV132_CTX * context)
{
#ifdef WORDS_BIGENDIAN
memcpy(digest, &context->state, 4);
#else
int i = 0;
unsigned char *c = (unsigned char *) &context->state;
for (i = 0; i < 4; i++) {
digest[i] = c[3 - i];
}
#endif
}
/* {{{ PHP_FNV164Init
* 64-bit FNV-1 hash initialisation
*/
PHP_HASH_API void PHP_FNV164Init(PHP_FNV164_CTX *context)
{
context->state = PHP_FNV1_64_INIT;
}
/* }}} */
PHP_HASH_API void PHP_FNV164Update(PHP_FNV164_CTX *context, const unsigned char *input,
unsigned int inputLen)
{
context->state = fnv_64_buf((void *)input, inputLen, context->state, 0);
}
PHP_HASH_API void PHP_FNV1a64Update(PHP_FNV164_CTX *context, const unsigned char *input,
unsigned int inputLen)
{
context->state = fnv_64_buf((void *)input, inputLen, context->state, 1);
}
PHP_HASH_API void PHP_FNV164Final(unsigned char digest[8], PHP_FNV164_CTX * context)
{
#ifdef WORDS_BIGENDIAN
memcpy(digest, &context->state, 8);
#else
int i = 0;
unsigned char *c = (unsigned char *) &context->state;
for (i = 0; i < 8; i++) {
digest[i] = c[7 - i];
}
#endif
}
/*
* fnv_32_buf - perform a 32 bit Fowler/Noll/Vo hash on a buffer
*
* input:
* buf - start of buffer to hash
* len - length of buffer in octets
* hval - previous hash value or 0 if first call
* alternate - if > 0 use the alternate version
*
* returns:
* 32 bit hash as a static hash type
*/
static php_hash_uint32
fnv_32_buf(void *buf, size_t len, php_hash_uint32 hval, int alternate)
{
unsigned char *bp = (unsigned char *)buf; /* start of buffer */
unsigned char *be = bp + len; /* beyond end of buffer */
/*
* FNV-1 hash each octet in the buffer
*/
while (bp < be) {
if (alternate == 0) {
/* multiply by the 32 bit FNV magic prime mod 2^32 */
hval *= PHP_FNV_32_PRIME;
/* xor the bottom with the current octet */
hval ^= (php_hash_uint32)*bp++;
} else {
/* xor the bottom with the current octet */
hval ^= (php_hash_uint32)*bp++;
/* multiply by the 32 bit FNV magic prime mod 2^32 */
hval *= PHP_FNV_32_PRIME;
}
}
/* return our new hash value */
return hval;
}
/*
* fnv_64_buf - perform a 64 bit Fowler/Noll/Vo hash on a buffer
*
* input:
* buf - start of buffer to hash
* len - length of buffer in octets
* hval - previous hash value or 0 if first call
* alternate - if > 0 use the alternate version
*
* returns:
* 64 bit hash as a static hash type
*/
static php_hash_uint64
fnv_64_buf(void *buf, size_t len, php_hash_uint64 hval, int alternate)
{
unsigned char *bp = (unsigned char *)buf; /* start of buffer */
unsigned char *be = bp + len; /* beyond end of buffer */
/*
* FNV-1 hash each octet of the buffer
*/
while (bp < be) {
if (alternate == 0) {
/* multiply by the 64 bit FNV magic prime mod 2^64 */
hval *= PHP_FNV_64_PRIME;
/* xor the bottom with the current octet */
hval ^= (php_hash_uint64)*bp++;
} else {
/* xor the bottom with the current octet */
hval ^= (php_hash_uint64)*bp++;
/* multiply by the 64 bit FNV magic prime mod 2^64 */
hval *= PHP_FNV_64_PRIME;
}
}
/* return our new hash value */
return hval;
}
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: noet sw=4 ts=4 fdm=marker
* vim<600: noet sw=4 ts=4
*/
|
