1 /*
2 +----------------------------------------------------------------------+
3 | PHP Version 7 |
4 +----------------------------------------------------------------------+
5 | Copyright (c) 1997-2016 The PHP Group |
6 +----------------------------------------------------------------------+
7 | This source file is subject to version 3.01 of the PHP license, |
8 | that is bundled with this package in the file LICENSE, and is |
9 | available through the world-wide-web at the following url: |
10 | http://www.php.net/license/3_01.txt |
11 | If you did not receive a copy of the PHP license and are unable to |
12 | obtain it through the world-wide-web, please send a note to |
13 | license@php.net so we can mail you a copy immediately. |
14 +----------------------------------------------------------------------+
15 | Author: Martin Jansen <mj@php.net> |
16 +----------------------------------------------------------------------+
17 */
18
19 /* $Id$ */
20
21 /* Implements Jenkins's one-at-a-time hashing algorithm as presented on
22 * http://www.burtleburtle.net/bob/hash/doobs.html.
23 */
24
25 #include "php_hash.h"
26 #include "php_hash_joaat.h"
27
28 const php_hash_ops php_hash_joaat_ops = {
29 (php_hash_init_func_t) PHP_JOAATInit,
30 (php_hash_update_func_t) PHP_JOAATUpdate,
31 (php_hash_final_func_t) PHP_JOAATFinal,
32 (php_hash_copy_func_t) php_hash_copy,
33 4,
34 4,
35 sizeof(PHP_JOAAT_CTX)
36 };
37
38 PHP_HASH_API void PHP_JOAATInit(PHP_JOAAT_CTX *context)
39 {
40 context->state = 0;
41 }
42
43 PHP_HASH_API void PHP_JOAATUpdate(PHP_JOAAT_CTX *context, const unsigned char *input, unsigned int inputLen)
44 {
45 context->state = joaat_buf((void *)input, inputLen, context->state);
46 }
47
48 PHP_HASH_API void PHP_JOAATFinal(unsigned char digest[4], PHP_JOAAT_CTX * context)
49 {
50 #ifdef WORDS_BIGENDIAN
51 memcpy(digest, &context->state, 4);
52 #else
53 int i = 0;
54 unsigned char *c = (unsigned char *) &context->state;
55
56 for (i = 0; i < 4; i++) {
57 digest[i] = c[3 - i];
58 }
59 #endif
60 context->state = 0;
61 }
62
63 /*
64 * joaat_buf - perform a Jenkins's one-at-a-time hash on a buffer
65 *
66 * input:
67 * buf - start of buffer to hash
68 * len - length of buffer in octets
69 *
70 * returns:
71 * 32 bit hash as a static hash type
72 */
73 static php_hash_uint32
74 joaat_buf(void *buf, size_t len, php_hash_uint32 hval)
75 {
76 size_t i;
77 unsigned char *input = (unsigned char *)buf;
78
79 for (i = 0; i < len; i++) {
80 hval += input[i];
81 hval += (hval << 10);
82 hval ^= (hval >> 6);
83 }
84
85 hval += (hval << 3);
86 hval ^= (hval >> 11);
87 hval += (hval << 15);
88
89 return hval;
90 }
91
92 /*
93 * Local variables:
94 * tab-width: 4
95 * c-basic-offset: 4
96 * End:
97 * vim600: noet sw=4 ts=4 fdm=marker
98 * vim<600: noet sw=4 ts=4
99 */