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_crc32.h"
22 #include "php_hash_crc32_tables.h"
23
PHP_CRC32Init(PHP_CRC32_CTX * context)24 PHP_HASH_API void PHP_CRC32Init(PHP_CRC32_CTX *context)
25 {
26 context->state = ~0;
27 }
28
PHP_CRC32Update(PHP_CRC32_CTX * context,const unsigned char * input,size_t len)29 PHP_HASH_API void PHP_CRC32Update(PHP_CRC32_CTX *context, const unsigned char *input, size_t len)
30 {
31 size_t i;
32
33 for (i = 0; i < len; ++i) {
34 context->state = (context->state << 8) ^ crc32_table[(context->state >> 24) ^ (input[i] & 0xff)];
35 }
36 }
37
PHP_CRC32BUpdate(PHP_CRC32_CTX * context,const unsigned char * input,size_t len)38 PHP_HASH_API void PHP_CRC32BUpdate(PHP_CRC32_CTX *context, const unsigned char *input, size_t len)
39 {
40 size_t i;
41
42 for (i = 0; i < len; ++i) {
43 context->state = (context->state >> 8) ^ crc32b_table[(context->state ^ input[i]) & 0xff];
44 }
45 }
46
PHP_CRC32Final(unsigned char digest[4],PHP_CRC32_CTX * context)47 PHP_HASH_API void PHP_CRC32Final(unsigned char digest[4], PHP_CRC32_CTX *context)
48 {
49 context->state=~context->state;
50 digest[3] = (unsigned char) ((context->state >> 24) & 0xff);
51 digest[2] = (unsigned char) ((context->state >> 16) & 0xff);
52 digest[1] = (unsigned char) ((context->state >> 8) & 0xff);
53 digest[0] = (unsigned char) (context->state & 0xff);
54 context->state = 0;
55 }
56
PHP_CRC32BFinal(unsigned char digest[4],PHP_CRC32_CTX * context)57 PHP_HASH_API void PHP_CRC32BFinal(unsigned char digest[4], PHP_CRC32_CTX *context)
58 {
59 context->state=~context->state;
60 digest[0] = (unsigned char) ((context->state >> 24) & 0xff);
61 digest[1] = (unsigned char) ((context->state >> 16) & 0xff);
62 digest[2] = (unsigned char) ((context->state >> 8) & 0xff);
63 digest[3] = (unsigned char) (context->state & 0xff);
64 context->state = 0;
65 }
66
PHP_CRC32Copy(const php_hash_ops * ops,PHP_CRC32_CTX * orig_context,PHP_CRC32_CTX * copy_context)67 PHP_HASH_API int PHP_CRC32Copy(const php_hash_ops *ops, PHP_CRC32_CTX *orig_context, PHP_CRC32_CTX *copy_context)
68 {
69 copy_context->state = orig_context->state;
70 return SUCCESS;
71 }
72
73 const php_hash_ops php_hash_crc32_ops = {
74 (php_hash_init_func_t) PHP_CRC32Init,
75 (php_hash_update_func_t) PHP_CRC32Update,
76 (php_hash_final_func_t) PHP_CRC32Final,
77 (php_hash_copy_func_t) PHP_CRC32Copy,
78 4, /* what to say here? */
79 4,
80 sizeof(PHP_CRC32_CTX),
81 0
82 };
83
84 const php_hash_ops php_hash_crc32b_ops = {
85 (php_hash_init_func_t) PHP_CRC32Init,
86 (php_hash_update_func_t) PHP_CRC32BUpdate,
87 (php_hash_final_func_t) PHP_CRC32BFinal,
88 (php_hash_copy_func_t) PHP_CRC32Copy,
89 4, /* what to say here? */
90 4,
91 sizeof(PHP_CRC32_CTX),
92 0
93 };
94
95 /*
96 * Local variables:
97 * tab-width: 4
98 * c-basic-offset: 4
99 * End:
100 * vim600: sw=4 ts=4 fdm=marker
101 * vim<600: sw=4 ts=4
102 */
103
