/src/php-src/ext/hash/hash_fnv.c

Source
/*
  +----------------------------------------------------------------------+
  | Copyright © The PHP Group and Contributors.                          |
  +----------------------------------------------------------------------+
  | This source file is subject to the Modified BSD License that is      |
  | bundled with this package in the file LICENSE, and is available      |
  | through the World Wide Web at <https://www.php.net/license/>.        |
  |                                                                      |
  | SPDX-License-Identifier: BSD-3-Clause                                |
  +----------------------------------------------------------------------+
  | Author: Michael Maclean <mgdm@php.net>                               |
  +----------------------------------------------------------------------+
*/

/*  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 = {
  "fnv132",
  (php_hash_init_func_t) PHP_FNV132Init,
  (php_hash_update_func_t) PHP_FNV132Update,
  (php_hash_final_func_t) PHP_FNV132Final,
  php_hash_copy,
  php_hash_serialize,
  php_hash_unserialize,
  PHP_FNV132_SPEC,
  4,
  4,
  sizeof(PHP_FNV132_CTX),
  0
};

const php_hash_ops php_hash_fnv1a32_ops = {
  "fnv1a32",
  (php_hash_init_func_t) PHP_FNV132Init,
  (php_hash_update_func_t) PHP_FNV1a32Update,
  (php_hash_final_func_t) PHP_FNV132Final,
  php_hash_copy,
  php_hash_serialize,
  php_hash_unserialize,
  PHP_FNV132_SPEC,
  4,
  4,
  sizeof(PHP_FNV132_CTX),
  0
};

const php_hash_ops php_hash_fnv164_ops = {
  "fnv164",
  (php_hash_init_func_t) PHP_FNV164Init,
  (php_hash_update_func_t) PHP_FNV164Update,
  (php_hash_final_func_t) PHP_FNV164Final,
  php_hash_copy,
  php_hash_serialize,
  php_hash_unserialize,
  PHP_FNV164_SPEC,
  8,
  4,
  sizeof(PHP_FNV164_CTX),
  0
};

const php_hash_ops php_hash_fnv1a64_ops = {
  "fnv1a64",
  (php_hash_init_func_t) PHP_FNV164Init,
  (php_hash_update_func_t) PHP_FNV1a64Update,
  (php_hash_final_func_t) PHP_FNV164Final,
  php_hash_copy,
  php_hash_serialize,
  php_hash_unserialize,
  PHP_FNV164_SPEC,
  8,
  4,
  sizeof(PHP_FNV164_CTX),
  0
};

/* {{{ PHP_FNV132Init
 * 32-bit FNV-1 hash initialisation
 */
PHP_HASH_API void PHP_FNV132Init(PHP_FNV132_CTX *context, ZEND_ATTRIBUTE_UNUSED HashTable *args)
{
  context->state = PHP_FNV1_32_INIT;
}
/* }}} */

PHP_HASH_API void PHP_FNV132Update(PHP_FNV132_CTX *context, const unsigned char *input,
    size_t 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,
    size_t 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, ZEND_ATTRIBUTE_UNUSED HashTable *args)
{
  context->state = PHP_FNV1_64_INIT;
}
/* }}} */

PHP_HASH_API void PHP_FNV164Update(PHP_FNV164_CTX *context, const unsigned char *input,
    size_t 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,
    size_t 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 uint32_t
fnv_32_buf(void *buf, size_t len, uint32_t 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
   */
  if (alternate == 0) {
    while (bp < be) {
      /* multiply by the 32 bit FNV magic prime mod 2^32 */
      hval *= PHP_FNV_32_PRIME;

      /* xor the bottom with the current octet */
      hval ^= (uint32_t)*bp++;
    }
  } else {
    while (bp < be) {
      /* xor the bottom with the current octet */
      hval ^= (uint32_t)*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 uint64_t
fnv_64_buf(void *buf, size_t len, uint64_t 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
   */

  if (alternate == 0) {
    while (bp < be) {
      /* multiply by the 64 bit FNV magic prime mod 2^64 */
      hval *= PHP_FNV_64_PRIME;

      /* xor the bottom with the current octet */
      hval ^= (uint64_t)*bp++;
    }
   } else {
    while (bp < be) {
      /* xor the bottom with the current octet */
      hval ^= (uint64_t)*bp++;

      /* multiply by the 64 bit FNV magic prime mod 2^64 */
      hval *= PHP_FNV_64_PRIME;
     }
  }

  /* return our new hash value */
  return hval;
}

Coverage Report

Created: 2026-06-02 06:36

Line	Count	Source
1		/*
2		+----------------------------------------------------------------------+
3		\| Copyright © The PHP Group and Contributors. \|
4		+----------------------------------------------------------------------+
5		\| This source file is subject to the Modified BSD License that is \|
6		\| bundled with this package in the file LICENSE, and is available \|
7		\| through the World Wide Web at <https://www.php.net/license/>. \|
8		\| \|
9		\| SPDX-License-Identifier: BSD-3-Clause \|
10		+----------------------------------------------------------------------+
11		\| Author: Michael Maclean <mgdm@php.net> \|
12		+----------------------------------------------------------------------+
13		*/
14
15		/* Based on the public domain algorithm found at
16		http://www.isthe.com/chongo/tech/comp/fnv/index.html */
17
18		#include "php_hash.h"
19		#include "php_hash_fnv.h"
20
21		const php_hash_ops php_hash_fnv132_ops = {
22		"fnv132",
23		(php_hash_init_func_t) PHP_FNV132Init,
24		(php_hash_update_func_t) PHP_FNV132Update,
25		(php_hash_final_func_t) PHP_FNV132Final,
26		php_hash_copy,
27		php_hash_serialize,
28		php_hash_unserialize,
29		PHP_FNV132_SPEC,
30		4,
31		4,
32		sizeof(PHP_FNV132_CTX),
33		0
34		};
35
36		const php_hash_ops php_hash_fnv1a32_ops = {
37		"fnv1a32",
38		(php_hash_init_func_t) PHP_FNV132Init,
39		(php_hash_update_func_t) PHP_FNV1a32Update,
40		(php_hash_final_func_t) PHP_FNV132Final,
41		php_hash_copy,
42		php_hash_serialize,
43		php_hash_unserialize,
44		PHP_FNV132_SPEC,
45		4,
46		4,
47		sizeof(PHP_FNV132_CTX),
48		0
49		};
50
51		const php_hash_ops php_hash_fnv164_ops = {
52		"fnv164",
53		(php_hash_init_func_t) PHP_FNV164Init,
54		(php_hash_update_func_t) PHP_FNV164Update,
55		(php_hash_final_func_t) PHP_FNV164Final,
56		php_hash_copy,
57		php_hash_serialize,
58		php_hash_unserialize,
59		PHP_FNV164_SPEC,
60		8,
61		4,
62		sizeof(PHP_FNV164_CTX),
63		0
64		};
65
66		const php_hash_ops php_hash_fnv1a64_ops = {
67		"fnv1a64",
68		(php_hash_init_func_t) PHP_FNV164Init,
69		(php_hash_update_func_t) PHP_FNV1a64Update,
70		(php_hash_final_func_t) PHP_FNV164Final,
71		php_hash_copy,
72		php_hash_serialize,
73		php_hash_unserialize,
74		PHP_FNV164_SPEC,
75		8,
76		4,
77		sizeof(PHP_FNV164_CTX),
78		0
79		};
80
81		/* {{{ PHP_FNV132Init
82		* 32-bit FNV-1 hash initialisation
83		*/
84		PHP_HASH_API void PHP_FNV132Init(PHP_FNV132_CTX context, ZEND_ATTRIBUTE_UNUSED HashTable args)
85	0	{
86	0	context->state = PHP_FNV1_32_INIT;
87	0	}
88		/* }}} */
89
90		PHP_HASH_API void PHP_FNV132Update(PHP_FNV132_CTX context, const unsigned char input,
91		size_t inputLen)
92	0	{
93	0	context->state = fnv_32_buf((void *)input, inputLen, context->state, 0);
94	0	}
95
96		PHP_HASH_API void PHP_FNV1a32Update(PHP_FNV132_CTX context, const unsigned char input,
97		size_t inputLen)
98	0	{
99	0	context->state = fnv_32_buf((void *)input, inputLen, context->state, 1);
100	0	}
101
102		PHP_HASH_API void PHP_FNV132Final(unsigned char digest[4], PHP_FNV132_CTX * context)
103	0	{
104		#ifdef WORDS_BIGENDIAN
105		memcpy(digest, &context->state, 4);
106		#else
107	0	int i = 0;
108	0	unsigned char c = (unsigned char ) &context->state;
109
110	0	for (i = 0; i < 4; i++) {
111	0	digest[i] = c[3 - i];
112	0	}
113	0	#endif
114	0	}
115
116		/* {{{ PHP_FNV164Init
117		* 64-bit FNV-1 hash initialisation
118		*/
119		PHP_HASH_API void PHP_FNV164Init(PHP_FNV164_CTX context, ZEND_ATTRIBUTE_UNUSED HashTable args)
120	0	{
121	0	context->state = PHP_FNV1_64_INIT;
122	0	}
123		/* }}} */
124
125		PHP_HASH_API void PHP_FNV164Update(PHP_FNV164_CTX context, const unsigned char input,
126		size_t inputLen)
127	0	{
128	0	context->state = fnv_64_buf((void *)input, inputLen, context->state, 0);
129	0	}
130
131		PHP_HASH_API void PHP_FNV1a64Update(PHP_FNV164_CTX context, const unsigned char input,
132		size_t inputLen)
133	0	{
134	0	context->state = fnv_64_buf((void *)input, inputLen, context->state, 1);
135	0	}
136
137		PHP_HASH_API void PHP_FNV164Final(unsigned char digest[8], PHP_FNV164_CTX * context)
138	0	{
139		#ifdef WORDS_BIGENDIAN
140		memcpy(digest, &context->state, 8);
141		#else
142	0	int i = 0;
143	0	unsigned char c = (unsigned char ) &context->state;
144
145	0	for (i = 0; i < 8; i++) {
146	0	digest[i] = c[7 - i];
147	0	}
148	0	#endif
149	0	}
150
151
152		/*
153		* fnv_32_buf - perform a 32 bit Fowler/Noll/Vo hash on a buffer
154		*
155		* input:
156		* buf - start of buffer to hash
157		* len - length of buffer in octets
158		* hval - previous hash value or 0 if first call
159		* alternate - if > 0 use the alternate version
160		*
161		* returns:
162		* 32-bit hash as a static hash type
163		*/
164		static uint32_t
165		fnv_32_buf(void *buf, size_t len, uint32_t hval, int alternate)
166	0	{
167	0	unsigned char bp = (unsigned char )buf; /* start of buffer */
168	0	unsigned char be = bp + len; / beyond end of buffer */
169
170		/*
171		* FNV-1 hash each octet in the buffer
172		*/
173	0	if (alternate == 0) {
174	0	while (bp < be) {
175		/* multiply by the 32 bit FNV magic prime mod 2^32 */
176	0	hval *= PHP_FNV_32_PRIME;
177
178		/* xor the bottom with the current octet */
179	0	hval ^= (uint32_t)*bp++;
180	0	}
181	0	} else {
182	0	while (bp < be) {
183		/* xor the bottom with the current octet */
184	0	hval ^= (uint32_t)*bp++;
185
186		/* multiply by the 32 bit FNV magic prime mod 2^32 */
187	0	hval *= PHP_FNV_32_PRIME;
188	0	}
189	0	}
190
191		/* return our new hash value */
192	0	return hval;
193	0	}
194
195		/*
196		* fnv_64_buf - perform a 64 bit Fowler/Noll/Vo hash on a buffer
197		*
198		* input:
199		* buf - start of buffer to hash
200		* len - length of buffer in octets
201		* hval - previous hash value or 0 if first call
202		* alternate - if > 0 use the alternate version
203		*
204		* returns:
205		* 64-bit hash as a static hash type
206		*/
207		static uint64_t
208		fnv_64_buf(void *buf, size_t len, uint64_t hval, int alternate)
209	0	{
210	0	unsigned char bp = (unsigned char )buf; /* start of buffer */
211	0	unsigned char be = bp + len; / beyond end of buffer */
212
213		/*
214		* FNV-1 hash each octet of the buffer
215		*/
216
217	0	if (alternate == 0) {
218	0	while (bp < be) {
219		/* multiply by the 64 bit FNV magic prime mod 2^64 */
220	0	hval *= PHP_FNV_64_PRIME;
221
222		/* xor the bottom with the current octet */
223	0	hval ^= (uint64_t)*bp++;
224	0	}
225	0	} else {
226	0	while (bp < be) {
227		/* xor the bottom with the current octet */
228	0	hval ^= (uint64_t)*bp++;
229
230		/* multiply by the 64 bit FNV magic prime mod 2^64 */
231	0	hval *= PHP_FNV_64_PRIME;
232	0	}
233	0	}
234
235		/* return our new hash value */
236	0	return hval;
237	0	}