1 /*
2 +----------------------------------------------------------------------+
3 | PHP Version 7 |
4 +----------------------------------------------------------------------+
5 | Copyright (c) 1997-2018 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 0
37 };
38
PHP_JOAATInit(PHP_JOAAT_CTX * context)39 PHP_HASH_API void PHP_JOAATInit(PHP_JOAAT_CTX *context)
40 {
41 context->state = 0;
42 }
43
PHP_JOAATUpdate(PHP_JOAAT_CTX * context,const unsigned char * input,unsigned int inputLen)44 PHP_HASH_API void PHP_JOAATUpdate(PHP_JOAAT_CTX *context, const unsigned char *input, unsigned int inputLen)
45 {
46 context->state = joaat_buf((void *)input, inputLen, context->state);
47 }
48
PHP_JOAATFinal(unsigned char digest[4],PHP_JOAAT_CTX * context)49 PHP_HASH_API void PHP_JOAATFinal(unsigned char digest[4], PHP_JOAAT_CTX * context)
50 {
51 #ifdef WORDS_BIGENDIAN
52 memcpy(digest, &context->state, 4);
53 #else
54 int i = 0;
55 unsigned char *c = (unsigned char *) &context->state;
56
57 for (i = 0; i < 4; i++) {
58 digest[i] = c[3 - i];
59 }
60 #endif
61 context->state = 0;
62 }
63
64 /*
65 * joaat_buf - perform a Jenkins's one-at-a-time hash on a buffer
66 *
67 * input:
68 * buf - start of buffer to hash
69 * len - length of buffer in octets
70 *
71 * returns:
72 * 32 bit hash as a static hash type
73 */
74 static uint32_t
joaat_buf(void * buf,size_t len,uint32_t hval)75 joaat_buf(void *buf, size_t len, uint32_t hval)
76 {
77 size_t i;
78 unsigned char *input = (unsigned char *)buf;
79
80 for (i = 0; i < len; i++) {
81 hval += input[i];
82 hval += (hval << 10);
83 hval ^= (hval >> 6);
84 }
85
86 hval += (hval << 3);
87 hval ^= (hval >> 11);
88 hval += (hval << 15);
89
90 return hval;
91 }
92
93 /*
94 * Local variables:
95 * tab-width: 4
96 * c-basic-offset: 4
97 * End:
98 * vim600: noet sw=4 ts=4 fdm=marker
99 * vim<600: noet sw=4 ts=4
100 */
101
