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 | Authors: Michael Wallner <mike@php.net> |
16 | Sara Golemon <pollita@php.net> |
17 +----------------------------------------------------------------------+
18 */
19
20 #include "php_hash.h"
21 #include "php_hash_adler32.h"
22
PHP_ADLER32Init(PHP_ADLER32_CTX * context)23 PHP_HASH_API void PHP_ADLER32Init(PHP_ADLER32_CTX *context)
24 {
25 context->state = 1;
26 }
27
PHP_ADLER32Update(PHP_ADLER32_CTX * context,const unsigned char * input,size_t len)28 PHP_HASH_API void PHP_ADLER32Update(PHP_ADLER32_CTX *context, const unsigned char *input, size_t len)
29 {
30 uint32_t i, s[2];
31
32 s[0] = context->state & 0xffff;
33 s[1] = (context->state >> 16) & 0xffff;
34 for (i = 0; i < len; ++i) {
35 s[0] += input[i];
36 s[1] += s[0];
37 if (s[1]>=0x7fffffff)
38 {
39 s[0] = s[0] % 65521;
40 s[1] = s[1] % 65521;
41 }
42 }
43 s[0] = s[0] % 65521;
44 s[1] = s[1] % 65521;
45 context->state = s[0] + (s[1] << 16);
46 }
47
PHP_ADLER32Final(unsigned char digest[4],PHP_ADLER32_CTX * context)48 PHP_HASH_API void PHP_ADLER32Final(unsigned char digest[4], PHP_ADLER32_CTX *context)
49 {
50 digest[0] = (unsigned char) ((context->state >> 24) & 0xff);
51 digest[1] = (unsigned char) ((context->state >> 16) & 0xff);
52 digest[2] = (unsigned char) ((context->state >> 8) & 0xff);
53 digest[3] = (unsigned char) (context->state & 0xff);
54 context->state = 0;
55 }
56
PHP_ADLER32Copy(const php_hash_ops * ops,PHP_ADLER32_CTX * orig_context,PHP_ADLER32_CTX * copy_context)57 PHP_HASH_API int PHP_ADLER32Copy(const php_hash_ops *ops, PHP_ADLER32_CTX *orig_context, PHP_ADLER32_CTX *copy_context)
58 {
59 copy_context->state = orig_context->state;
60 return SUCCESS;
61 }
62
63 const php_hash_ops php_hash_adler32_ops = {
64 (php_hash_init_func_t) PHP_ADLER32Init,
65 (php_hash_update_func_t) PHP_ADLER32Update,
66 (php_hash_final_func_t) PHP_ADLER32Final,
67 (php_hash_copy_func_t) PHP_ADLER32Copy,
68 4, /* what to say here? */
69 4,
70 sizeof(PHP_ADLER32_CTX),
71 0
72 };
73
74 /*
75 * Local variables:
76 * tab-width: 4
77 * c-basic-offset: 4
78 * End:
79 * vim600: sw=4 ts=4 fdm=marker
80 * vim<600: sw=4 ts=4
81 */
82
