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 /* Implements Jenkins's one-at-a-time hashing algorithm as presented on
20 * http://www.burtleburtle.net/bob/hash/doobs.html.
21 */
22
23 #include "php_hash.h"
24 #include "php_hash_joaat.h"
25
26 const php_hash_ops php_hash_joaat_ops = {
27 (php_hash_init_func_t) PHP_JOAATInit,
28 (php_hash_update_func_t) PHP_JOAATUpdate,
29 (php_hash_final_func_t) PHP_JOAATFinal,
30 (php_hash_copy_func_t) php_hash_copy,
31 4,
32 4,
33 sizeof(PHP_JOAAT_CTX),
34 0
35 };
36
PHP_JOAATInit(PHP_JOAAT_CTX * context)37 PHP_HASH_API void PHP_JOAATInit(PHP_JOAAT_CTX *context)
38 {
39 context->state = 0;
40 }
41
PHP_JOAATUpdate(PHP_JOAAT_CTX * context,const unsigned char * input,unsigned int inputLen)42 PHP_HASH_API void PHP_JOAATUpdate(PHP_JOAAT_CTX *context, const unsigned char *input, unsigned int inputLen)
43 {
44 context->state = joaat_buf((void *)input, inputLen, context->state);
45 }
46
PHP_JOAATFinal(unsigned char digest[4],PHP_JOAAT_CTX * context)47 PHP_HASH_API void PHP_JOAATFinal(unsigned char digest[4], PHP_JOAAT_CTX * context)
48 {
49 #ifdef WORDS_BIGENDIAN
50 memcpy(digest, &context->state, 4);
51 #else
52 int i = 0;
53 unsigned char *c = (unsigned char *) &context->state;
54
55 for (i = 0; i < 4; i++) {
56 digest[i] = c[3 - i];
57 }
58 #endif
59 context->state = 0;
60 }
61
62 /*
63 * joaat_buf - perform a Jenkins's one-at-a-time hash on a buffer
64 *
65 * input:
66 * buf - start of buffer to hash
67 * len - length of buffer in octets
68 *
69 * returns:
70 * 32 bit hash as a static hash type
71 */
72 static uint32_t
joaat_buf(void * buf,size_t len,uint32_t hval)73 joaat_buf(void *buf, size_t len, uint32_t hval)
74 {
75 size_t i;
76 unsigned char *input = (unsigned char *)buf;
77
78 for (i = 0; i < len; i++) {
79 hval += input[i];
80 hval += (hval << 10);
81 hval ^= (hval >> 6);
82 }
83
84 hval += (hval << 3);
85 hval ^= (hval >> 11);
86 hval += (hval << 15);
87
88 return hval;
89 }
90
91 /*
92 * Local variables:
93 * tab-width: 4
94 * c-basic-offset: 4
95 * End:
96 * vim600: noet sw=4 ts=4 fdm=marker
97 * vim<600: noet sw=4 ts=4
98 */
99
