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c79ce48ddb
This variant of crc32 is heavily used by storage systems, such as iSCSI, SCTP, Btrfs, ext4, and is increasingly being used in API (such as Google Cloud Storage, and Apache Kafka).
114 lines
3.8 KiB
C
114 lines
3.8 KiB
C
/*
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+----------------------------------------------------------------------+
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| PHP Version 7 |
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+----------------------------------------------------------------------+
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| Copyright (c) The PHP Group |
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+----------------------------------------------------------------------+
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| This source file is subject to version 3.01 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.php.net/license/3_01.txt |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Authors: Michael Wallner <mike@php.net> |
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| Sara Golemon <pollita@php.net> |
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+----------------------------------------------------------------------+
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*/
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#include "php_hash.h"
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#include "php_hash_crc32.h"
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#include "php_hash_crc32_tables.h"
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PHP_HASH_API void PHP_CRC32Init(PHP_CRC32_CTX *context)
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{
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context->state = ~0;
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}
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PHP_HASH_API void PHP_CRC32Update(PHP_CRC32_CTX *context, const unsigned char *input, size_t len)
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{
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size_t i;
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for (i = 0; i < len; ++i) {
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context->state = (context->state << 8) ^ crc32_table[(context->state >> 24) ^ (input[i] & 0xff)];
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}
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}
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PHP_HASH_API void PHP_CRC32BUpdate(PHP_CRC32_CTX *context, const unsigned char *input, size_t len)
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{
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size_t i;
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for (i = 0; i < len; ++i) {
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context->state = (context->state >> 8) ^ crc32b_table[(context->state ^ input[i]) & 0xff];
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}
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}
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PHP_HASH_API void PHP_CRC32CUpdate(PHP_CRC32_CTX *context, const unsigned char *input, size_t len)
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{
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size_t i;
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for (i = 0; i < len; ++i) {
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context->state = (context->state >> 8) ^ crc32c_table[(context->state ^ input[i]) & 0xff];
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}
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}
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PHP_HASH_API void PHP_CRC32LEFinal(unsigned char digest[4], PHP_CRC32_CTX *context)
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{
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context->state=~context->state;
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digest[3] = (unsigned char) ((context->state >> 24) & 0xff);
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digest[2] = (unsigned char) ((context->state >> 16) & 0xff);
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digest[1] = (unsigned char) ((context->state >> 8) & 0xff);
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digest[0] = (unsigned char) (context->state & 0xff);
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context->state = 0;
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}
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PHP_HASH_API void PHP_CRC32BEFinal(unsigned char digest[4], PHP_CRC32_CTX *context)
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{
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context->state=~context->state;
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digest[0] = (unsigned char) ((context->state >> 24) & 0xff);
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digest[1] = (unsigned char) ((context->state >> 16) & 0xff);
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digest[2] = (unsigned char) ((context->state >> 8) & 0xff);
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digest[3] = (unsigned char) (context->state & 0xff);
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context->state = 0;
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}
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PHP_HASH_API int PHP_CRC32Copy(const php_hash_ops *ops, PHP_CRC32_CTX *orig_context, PHP_CRC32_CTX *copy_context)
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{
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copy_context->state = orig_context->state;
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return SUCCESS;
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}
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const php_hash_ops php_hash_crc32_ops = {
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(php_hash_init_func_t) PHP_CRC32Init,
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(php_hash_update_func_t) PHP_CRC32Update,
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(php_hash_final_func_t) PHP_CRC32LEFinal,
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(php_hash_copy_func_t) PHP_CRC32Copy,
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4, /* what to say here? */
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4,
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sizeof(PHP_CRC32_CTX),
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0
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};
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const php_hash_ops php_hash_crc32b_ops = {
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(php_hash_init_func_t) PHP_CRC32Init,
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(php_hash_update_func_t) PHP_CRC32BUpdate,
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(php_hash_final_func_t) PHP_CRC32BEFinal,
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(php_hash_copy_func_t) PHP_CRC32Copy,
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4, /* what to say here? */
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4,
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sizeof(PHP_CRC32_CTX),
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0
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};
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const php_hash_ops php_hash_crc32c_ops = {
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(php_hash_init_func_t) PHP_CRC32Init,
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(php_hash_update_func_t) PHP_CRC32CUpdate,
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(php_hash_final_func_t) PHP_CRC32BEFinal,
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(php_hash_copy_func_t) PHP_CRC32Copy,
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4, /* what to say here? */
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4,
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sizeof(PHP_CRC32_CTX),
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0
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};
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