1 | /* |
2 | +----------------------------------------------------------------------+ |
3 | | PHP Version 5 | |
4 | +----------------------------------------------------------------------+ |
5 | | Copyright (c) 1997-2015 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 | /* $Id$ */ |
21 | |
22 | #include "php_hash.h" |
23 | #include "php_hash_crc32.h" |
24 | #include "php_hash_crc32_tables.h" |
25 | |
26 | PHP_HASH_API void PHP_CRC32Init(PHP_CRC32_CTX *context) |
27 | { |
28 | context->state = ~0; |
29 | } |
30 | |
31 | PHP_HASH_API void PHP_CRC32Update(PHP_CRC32_CTX *context, const unsigned char *input, size_t len) |
32 | { |
33 | size_t i; |
34 | |
35 | for (i = 0; i < len; ++i) { |
36 | context->state = (context->state << 8) ^ crc32_table[(context->state >> 24) ^ (input[i] & 0xff)]; |
37 | } |
38 | } |
39 | |
40 | PHP_HASH_API void PHP_CRC32BUpdate(PHP_CRC32_CTX *context, const unsigned char *input, size_t len) |
41 | { |
42 | size_t i; |
43 | |
44 | for (i = 0; i < len; ++i) { |
45 | context->state = (context->state >> 8) ^ crc32b_table[(context->state ^ input[i]) & 0xff]; |
46 | } |
47 | } |
48 | |
49 | PHP_HASH_API void PHP_CRC32Final(unsigned char digest[4], PHP_CRC32_CTX *context) |
50 | { |
51 | context->state=~context->state; |
52 | digest[3] = (unsigned char) ((context->state >> 24) & 0xff); |
53 | digest[2] = (unsigned char) ((context->state >> 16) & 0xff); |
54 | digest[1] = (unsigned char) ((context->state >> 8) & 0xff); |
55 | digest[0] = (unsigned char) (context->state & 0xff); |
56 | context->state = 0; |
57 | } |
58 | |
59 | PHP_HASH_API void PHP_CRC32BFinal(unsigned char digest[4], PHP_CRC32_CTX *context) |
60 | { |
61 | context->state=~context->state; |
62 | digest[0] = (unsigned char) ((context->state >> 24) & 0xff); |
63 | digest[1] = (unsigned char) ((context->state >> 16) & 0xff); |
64 | digest[2] = (unsigned char) ((context->state >> 8) & 0xff); |
65 | digest[3] = (unsigned char) (context->state & 0xff); |
66 | context->state = 0; |
67 | } |
68 | |
69 | PHP_HASH_API int PHP_CRC32Copy(const php_hash_ops *ops, PHP_CRC32_CTX *orig_context, PHP_CRC32_CTX *copy_context) |
70 | { |
71 | copy_context->state = orig_context->state; |
72 | return SUCCESS; |
73 | } |
74 | |
75 | const php_hash_ops php_hash_crc32_ops = { |
76 | (php_hash_init_func_t) PHP_CRC32Init, |
77 | (php_hash_update_func_t) PHP_CRC32Update, |
78 | (php_hash_final_func_t) PHP_CRC32Final, |
79 | (php_hash_copy_func_t) PHP_CRC32Copy, |
80 | 4, /* what to say here? */ |
81 | 4, |
82 | sizeof(PHP_CRC32_CTX) |
83 | }; |
84 | |
85 | const php_hash_ops php_hash_crc32b_ops = { |
86 | (php_hash_init_func_t) PHP_CRC32Init, |
87 | (php_hash_update_func_t) PHP_CRC32BUpdate, |
88 | (php_hash_final_func_t) PHP_CRC32BFinal, |
89 | (php_hash_copy_func_t) PHP_CRC32Copy, |
90 | 4, /* what to say here? */ |
91 | 4, |
92 | sizeof(PHP_CRC32_CTX) |
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 | |