1 /*
2 +----------------------------------------------------------------------+
3 | Copyright (c) The PHP Group |
4 +----------------------------------------------------------------------+
5 | This source file is subject to version 3.01 of the PHP license, |
6 | that is bundled with this package in the file LICENSE, and is |
7 | available through the world-wide-web at the following url: |
8 | http://www.php.net/license/3_01.txt |
9 | If you did not receive a copy of the PHP license and are unable to |
10 | obtain it through the world-wide-web, please send a note to |
11 | license@php.net so we can mail you a copy immediately. |
12 +----------------------------------------------------------------------+
13 | Author: Michael Maclean <mgdm@php.net> |
14 +----------------------------------------------------------------------+
15 */
16
17 /* Based on the public domain algorithm found at
18 http://www.isthe.com/chongo/tech/comp/fnv/index.html */
19
20 #include "php_hash.h"
21 #include "php_hash_fnv.h"
22
23 const php_hash_ops php_hash_fnv132_ops = {
24 "fnv132",
25 (php_hash_init_func_t) PHP_FNV132Init,
26 (php_hash_update_func_t) PHP_FNV132Update,
27 (php_hash_final_func_t) PHP_FNV132Final,
28 php_hash_copy,
29 php_hash_serialize,
30 php_hash_unserialize,
31 PHP_FNV132_SPEC,
32 4,
33 4,
34 sizeof(PHP_FNV132_CTX),
35 0
36 };
37
38 const php_hash_ops php_hash_fnv1a32_ops = {
39 "fnv1a32",
40 (php_hash_init_func_t) PHP_FNV132Init,
41 (php_hash_update_func_t) PHP_FNV1a32Update,
42 (php_hash_final_func_t) PHP_FNV132Final,
43 php_hash_copy,
44 php_hash_serialize,
45 php_hash_unserialize,
46 PHP_FNV132_SPEC,
47 4,
48 4,
49 sizeof(PHP_FNV132_CTX),
50 0
51 };
52
53 const php_hash_ops php_hash_fnv164_ops = {
54 "fnv164",
55 (php_hash_init_func_t) PHP_FNV164Init,
56 (php_hash_update_func_t) PHP_FNV164Update,
57 (php_hash_final_func_t) PHP_FNV164Final,
58 php_hash_copy,
59 php_hash_serialize,
60 php_hash_unserialize,
61 PHP_FNV164_SPEC,
62 8,
63 4,
64 sizeof(PHP_FNV164_CTX),
65 0
66 };
67
68 const php_hash_ops php_hash_fnv1a64_ops = {
69 "fnv1a64",
70 (php_hash_init_func_t) PHP_FNV164Init,
71 (php_hash_update_func_t) PHP_FNV1a64Update,
72 (php_hash_final_func_t) PHP_FNV164Final,
73 php_hash_copy,
74 php_hash_serialize,
75 php_hash_unserialize,
76 PHP_FNV164_SPEC,
77 8,
78 4,
79 sizeof(PHP_FNV164_CTX),
80 0
81 };
82
83 /* {{{ PHP_FNV132Init
84 * 32-bit FNV-1 hash initialisation
85 */
PHP_FNV132Init(PHP_FNV132_CTX * context)86 PHP_HASH_API void PHP_FNV132Init(PHP_FNV132_CTX *context)
87 {
88 context->state = PHP_FNV1_32_INIT;
89 }
90 /* }}} */
91
PHP_FNV132Update(PHP_FNV132_CTX * context,const unsigned char * input,size_t inputLen)92 PHP_HASH_API void PHP_FNV132Update(PHP_FNV132_CTX *context, const unsigned char *input,
93 size_t inputLen)
94 {
95 context->state = fnv_32_buf((void *)input, inputLen, context->state, 0);
96 }
97
PHP_FNV1a32Update(PHP_FNV132_CTX * context,const unsigned char * input,size_t inputLen)98 PHP_HASH_API void PHP_FNV1a32Update(PHP_FNV132_CTX *context, const unsigned char *input,
99 size_t inputLen)
100 {
101 context->state = fnv_32_buf((void *)input, inputLen, context->state, 1);
102 }
103
PHP_FNV132Final(unsigned char digest[4],PHP_FNV132_CTX * context)104 PHP_HASH_API void PHP_FNV132Final(unsigned char digest[4], PHP_FNV132_CTX * context)
105 {
106 #ifdef WORDS_BIGENDIAN
107 memcpy(digest, &context->state, 4);
108 #else
109 int i = 0;
110 unsigned char *c = (unsigned char *) &context->state;
111
112 for (i = 0; i < 4; i++) {
113 digest[i] = c[3 - i];
114 }
115 #endif
116 }
117
118 /* {{{ PHP_FNV164Init
119 * 64-bit FNV-1 hash initialisation
120 */
PHP_FNV164Init(PHP_FNV164_CTX * context)121 PHP_HASH_API void PHP_FNV164Init(PHP_FNV164_CTX *context)
122 {
123 context->state = PHP_FNV1_64_INIT;
124 }
125 /* }}} */
126
PHP_FNV164Update(PHP_FNV164_CTX * context,const unsigned char * input,size_t inputLen)127 PHP_HASH_API void PHP_FNV164Update(PHP_FNV164_CTX *context, const unsigned char *input,
128 size_t inputLen)
129 {
130 context->state = fnv_64_buf((void *)input, inputLen, context->state, 0);
131 }
132
PHP_FNV1a64Update(PHP_FNV164_CTX * context,const unsigned char * input,size_t inputLen)133 PHP_HASH_API void PHP_FNV1a64Update(PHP_FNV164_CTX *context, const unsigned char *input,
134 size_t inputLen)
135 {
136 context->state = fnv_64_buf((void *)input, inputLen, context->state, 1);
137 }
138
PHP_FNV164Final(unsigned char digest[8],PHP_FNV164_CTX * context)139 PHP_HASH_API void PHP_FNV164Final(unsigned char digest[8], PHP_FNV164_CTX * context)
140 {
141 #ifdef WORDS_BIGENDIAN
142 memcpy(digest, &context->state, 8);
143 #else
144 int i = 0;
145 unsigned char *c = (unsigned char *) &context->state;
146
147 for (i = 0; i < 8; i++) {
148 digest[i] = c[7 - i];
149 }
150 #endif
151 }
152
153
154 /*
155 * fnv_32_buf - perform a 32 bit Fowler/Noll/Vo hash on a buffer
156 *
157 * input:
158 * buf - start of buffer to hash
159 * len - length of buffer in octets
160 * hval - previous hash value or 0 if first call
161 * alternate - if > 0 use the alternate version
162 *
163 * returns:
164 * 32 bit hash as a static hash type
165 */
166 static uint32_t
fnv_32_buf(void * buf,size_t len,uint32_t hval,int alternate)167 fnv_32_buf(void *buf, size_t len, uint32_t hval, int alternate)
168 {
169 unsigned char *bp = (unsigned char *)buf; /* start of buffer */
170 unsigned char *be = bp + len; /* beyond end of buffer */
171
172 /*
173 * FNV-1 hash each octet in the buffer
174 */
175 if (alternate == 0) {
176 while (bp < be) {
177 /* multiply by the 32 bit FNV magic prime mod 2^32 */
178 hval *= PHP_FNV_32_PRIME;
179
180 /* xor the bottom with the current octet */
181 hval ^= (uint32_t)*bp++;
182 }
183 } else {
184 while (bp < be) {
185 /* xor the bottom with the current octet */
186 hval ^= (uint32_t)*bp++;
187
188 /* multiply by the 32 bit FNV magic prime mod 2^32 */
189 hval *= PHP_FNV_32_PRIME;
190 }
191 }
192
193 /* return our new hash value */
194 return hval;
195 }
196
197 /*
198 * fnv_64_buf - perform a 64 bit Fowler/Noll/Vo hash on a buffer
199 *
200 * input:
201 * buf - start of buffer to hash
202 * len - length of buffer in octets
203 * hval - previous hash value or 0 if first call
204 * alternate - if > 0 use the alternate version
205 *
206 * returns:
207 * 64 bit hash as a static hash type
208 */
209 static uint64_t
fnv_64_buf(void * buf,size_t len,uint64_t hval,int alternate)210 fnv_64_buf(void *buf, size_t len, uint64_t hval, int alternate)
211 {
212 unsigned char *bp = (unsigned char *)buf; /* start of buffer */
213 unsigned char *be = bp + len; /* beyond end of buffer */
214
215 /*
216 * FNV-1 hash each octet of the buffer
217 */
218
219 if (alternate == 0) {
220 while (bp < be) {
221 /* multiply by the 64 bit FNV magic prime mod 2^64 */
222 hval *= PHP_FNV_64_PRIME;
223
224 /* xor the bottom with the current octet */
225 hval ^= (uint64_t)*bp++;
226 }
227 } else {
228 while (bp < be) {
229 /* xor the bottom with the current octet */
230 hval ^= (uint64_t)*bp++;
231
232 /* multiply by the 64 bit FNV magic prime mod 2^64 */
233 hval *= PHP_FNV_64_PRIME;
234 }
235 }
236
237 /* return our new hash value */
238 return hval;
239 }
240
