xref: /PHP-8.1/ext/hash/hash_crc32.c (revision 01b3fc03)
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_crc32.h"
20 #include "php_hash_crc32_tables.h"
21 #include "ext/standard/crc32_x86.h"
22 
PHP_CRC32Init(PHP_CRC32_CTX * context,ZEND_ATTRIBUTE_UNUSED HashTable * args)23 PHP_HASH_API void PHP_CRC32Init(PHP_CRC32_CTX *context, ZEND_ATTRIBUTE_UNUSED HashTable *args)
24 {
25 	context->state = ~0;
26 }
27 
PHP_CRC32Update(PHP_CRC32_CTX * context,const unsigned char * input,size_t len)28 PHP_HASH_API void PHP_CRC32Update(PHP_CRC32_CTX *context, const unsigned char *input, size_t len)
29 {
30 	size_t i = 0;
31 
32 #if ZEND_INTRIN_SSE4_2_PCLMUL_NATIVE || ZEND_INTRIN_SSE4_2_PCLMUL_RESOLVER
33 	i += crc32_x86_simd_update(X86_CRC32, &context->state, input, len);
34 #endif
35 
36 	for (; i < len; ++i) {
37 		context->state = (context->state << 8) ^ crc32_table[(context->state >> 24) ^ (input[i] & 0xff)];
38 	}
39 }
40 
PHP_CRC32BUpdate(PHP_CRC32_CTX * context,const unsigned char * input,size_t len)41 PHP_HASH_API void PHP_CRC32BUpdate(PHP_CRC32_CTX *context, const unsigned char *input, size_t len)
42 {
43 	size_t i = 0;
44 
45 #if ZEND_INTRIN_SSE4_2_PCLMUL_NATIVE || ZEND_INTRIN_SSE4_2_PCLMUL_RESOLVER
46 	i += crc32_x86_simd_update(X86_CRC32B, &context->state, input, len);
47 #endif
48 
49 	for (; i < len; ++i) {
50 		context->state = (context->state >> 8) ^ crc32b_table[(context->state ^ input[i]) & 0xff];
51 	}
52 }
53 
PHP_CRC32CUpdate(PHP_CRC32_CTX * context,const unsigned char * input,size_t len)54 PHP_HASH_API void PHP_CRC32CUpdate(PHP_CRC32_CTX *context, const unsigned char *input, size_t len)
55 {
56 	size_t i = 0;
57 
58 #if ZEND_INTRIN_SSE4_2_PCLMUL_NATIVE || ZEND_INTRIN_SSE4_2_PCLMUL_RESOLVER
59 	i += crc32_x86_simd_update(X86_CRC32C, &context->state, input, len);
60 #endif
61 
62 	for (; i < len; ++i) {
63 		context->state = (context->state >> 8) ^ crc32c_table[(context->state ^ input[i]) & 0xff];
64 	}
65 }
66 
PHP_CRC32LEFinal(unsigned char digest[4],PHP_CRC32_CTX * context)67 PHP_HASH_API void PHP_CRC32LEFinal(unsigned char digest[4], PHP_CRC32_CTX *context)
68 {
69 	context->state=~context->state;
70 	digest[3] = (unsigned char) ((context->state >> 24) & 0xff);
71 	digest[2] = (unsigned char) ((context->state >> 16) & 0xff);
72 	digest[1] = (unsigned char) ((context->state >> 8) & 0xff);
73 	digest[0] = (unsigned char) (context->state & 0xff);
74 	context->state = 0;
75 }
76 
PHP_CRC32BEFinal(unsigned char digest[4],PHP_CRC32_CTX * context)77 PHP_HASH_API void PHP_CRC32BEFinal(unsigned char digest[4], PHP_CRC32_CTX *context)
78 {
79 	context->state=~context->state;
80 	digest[0] = (unsigned char) ((context->state >> 24) & 0xff);
81 	digest[1] = (unsigned char) ((context->state >> 16) & 0xff);
82 	digest[2] = (unsigned char) ((context->state >> 8) & 0xff);
83 	digest[3] = (unsigned char) (context->state & 0xff);
84 	context->state = 0;
85 }
86 
PHP_CRC32Copy(const php_hash_ops * ops,PHP_CRC32_CTX * orig_context,PHP_CRC32_CTX * copy_context)87 PHP_HASH_API int PHP_CRC32Copy(const php_hash_ops *ops, PHP_CRC32_CTX *orig_context, PHP_CRC32_CTX *copy_context)
88 {
89 	copy_context->state = orig_context->state;
90 	return SUCCESS;
91 }
92 
93 const php_hash_ops php_hash_crc32_ops = {
94 	"crc32",
95 	(php_hash_init_func_t) PHP_CRC32Init,
96 	(php_hash_update_func_t) PHP_CRC32Update,
97 	(php_hash_final_func_t) PHP_CRC32LEFinal,
98 	(php_hash_copy_func_t) PHP_CRC32Copy,
99 	php_hash_serialize,
100 	php_hash_unserialize,
101 	PHP_CRC32_SPEC,
102 	4, /* what to say here? */
103 	4,
104 	sizeof(PHP_CRC32_CTX),
105 	0
106 };
107 
108 const php_hash_ops php_hash_crc32b_ops = {
109 	"crc32b",
110 	(php_hash_init_func_t) PHP_CRC32Init,
111 	(php_hash_update_func_t) PHP_CRC32BUpdate,
112 	(php_hash_final_func_t) PHP_CRC32BEFinal,
113 	(php_hash_copy_func_t) PHP_CRC32Copy,
114 	php_hash_serialize,
115 	php_hash_unserialize,
116 	PHP_CRC32_SPEC,
117 	4, /* what to say here? */
118 	4,
119 	sizeof(PHP_CRC32_CTX),
120 	0
121 };
122 
123 const php_hash_ops php_hash_crc32c_ops = {
124 	"crc32c",
125 	(php_hash_init_func_t) PHP_CRC32Init,
126 	(php_hash_update_func_t) PHP_CRC32CUpdate,
127 	(php_hash_final_func_t) PHP_CRC32BEFinal,
128 	(php_hash_copy_func_t) PHP_CRC32Copy,
129 	php_hash_serialize,
130 	php_hash_unserialize,
131 	PHP_CRC32_SPEC,
132 	4, /* what to say here? */
133 	4,
134 	sizeof(PHP_CRC32_CTX),
135 	0
136 };
137