1 /*
2 +----------------------------------------------------------------------+
3 | Copyright (c) The PHP Group |
4 +----------------------------------------------------------------------+
5 | This source file is subject to version 3.01 of the PHP license, |
6 | that is bundled with this package in the file LICENSE, and is |
7 | available through the world-wide-web at the following url: |
8 | https://www.php.net/license/3_01.txt |
9 | If you did not receive a copy of the PHP license and are unable to |
10 | obtain it through the world-wide-web, please send a note to |
11 | license@php.net so we can mail you a copy immediately. |
12 +----------------------------------------------------------------------+
13 | Authors: Michael Wallner <mike@php.net> |
14 | Sara Golemon <pollita@php.net> |
15 +----------------------------------------------------------------------+
16 */
17
18 #include "php_hash.h"
19 #include "php_hash_adler32.h"
20
PHP_ADLER32Init(PHP_ADLER32_CTX * context,ZEND_ATTRIBUTE_UNUSED HashTable * args)21 PHP_HASH_API void PHP_ADLER32Init(PHP_ADLER32_CTX *context, ZEND_ATTRIBUTE_UNUSED HashTable *args)
22 {
23 context->state = 1;
24 }
25
PHP_ADLER32Update(PHP_ADLER32_CTX * context,const unsigned char * input,size_t len)26 PHP_HASH_API void PHP_ADLER32Update(PHP_ADLER32_CTX *context, const unsigned char *input, size_t len)
27 {
28 uint32_t s[2];
29
30 s[0] = context->state & 0xffff;
31 s[1] = (context->state >> 16) & 0xffff;
32 for (size_t i = 0; i < len; ++i) {
33 s[0] += input[i];
34 s[1] += s[0];
35 if (s[1]>=0x7fffffff)
36 {
37 s[0] = s[0] % 65521;
38 s[1] = s[1] % 65521;
39 }
40 }
41 s[0] = s[0] % 65521;
42 s[1] = s[1] % 65521;
43 context->state = s[0] + (s[1] << 16);
44 }
45
PHP_ADLER32Final(unsigned char digest[4],PHP_ADLER32_CTX * context)46 PHP_HASH_API void PHP_ADLER32Final(unsigned char digest[4], PHP_ADLER32_CTX *context)
47 {
48 digest[0] = (unsigned char) ((context->state >> 24) & 0xff);
49 digest[1] = (unsigned char) ((context->state >> 16) & 0xff);
50 digest[2] = (unsigned char) ((context->state >> 8) & 0xff);
51 digest[3] = (unsigned char) (context->state & 0xff);
52 context->state = 0;
53 }
54
PHP_ADLER32Copy(const php_hash_ops * ops,PHP_ADLER32_CTX * orig_context,PHP_ADLER32_CTX * copy_context)55 PHP_HASH_API int PHP_ADLER32Copy(const php_hash_ops *ops, PHP_ADLER32_CTX *orig_context, PHP_ADLER32_CTX *copy_context)
56 {
57 copy_context->state = orig_context->state;
58 return SUCCESS;
59 }
60
61 const php_hash_ops php_hash_adler32_ops = {
62 "adler32",
63 (php_hash_init_func_t) PHP_ADLER32Init,
64 (php_hash_update_func_t) PHP_ADLER32Update,
65 (php_hash_final_func_t) PHP_ADLER32Final,
66 (php_hash_copy_func_t) PHP_ADLER32Copy,
67 php_hash_serialize,
68 php_hash_unserialize,
69 PHP_ADLER32_SPEC,
70 4, /* what to say here? */
71 4,
72 sizeof(PHP_ADLER32_CTX),
73 0
74 };
75
