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/* +----------------------------------------------------------------------+ | PHP Version 5 | +----------------------------------------------------------------------+ | Copyright (c) 1997-2016 The PHP Group | +----------------------------------------------------------------------+ | This source file is subject to version 3.01 of the PHP license, | | that is bundled with this package in the file LICENSE, and is | | available through the world-wide-web at the following url: | | http://www.php.net/license/3_01.txt | | If you did not receive a copy of the PHP license and are unable to | | obtain it through the world-wide-web, please send a note to | | license@php.net so we can mail you a copy immediately. | +----------------------------------------------------------------------+ | Author: Martin Jansen <mj@php.net> | +----------------------------------------------------------------------+ */ /* $Id$ */ /* Implements Jenkins's one-at-a-time hashing algorithm as presented on * http://www.burtleburtle.net/bob/hash/doobs.html. */ #include "php_hash.h" #include "php_hash_joaat.h" const php_hash_ops php_hash_joaat_ops = { (php_hash_init_func_t) PHP_JOAATInit, (php_hash_update_func_t) PHP_JOAATUpdate, (php_hash_final_func_t) PHP_JOAATFinal, (php_hash_copy_func_t) php_hash_copy, 4, 4, sizeof(PHP_JOAAT_CTX) }; PHP_HASH_API void PHP_JOAATInit(PHP_JOAAT_CTX *context) { context->state = 0; } PHP_HASH_API void PHP_JOAATUpdate(PHP_JOAAT_CTX *context, const unsigned char *input, unsigned int inputLen) { context->state = joaat_buf((void *)input, inputLen, context->state); } PHP_HASH_API void PHP_JOAATFinal(unsigned char digest[4], PHP_JOAAT_CTX * context) { #ifdef WORDS_BIGENDIAN memcpy(digest, &context->state, 4); #else int i = 0; unsigned char *c = (unsigned char *) &context->state; for (i = 0; i < 4; i++) { digest[i] = c[3 - i]; } #endif context->state = 0; } /* * joaat_buf - perform a Jenkins's one-at-a-time hash on a buffer * * input: * buf - start of buffer to hash * len - length of buffer in octets * * returns: * 32 bit hash as a static hash type */ static php_hash_uint32 joaat_buf(void *buf, size_t len, php_hash_uint32 hval) { size_t i; unsigned char *input = (unsigned char *)buf; for (i = 0; i < len; i++) { hval += input[i]; hval += (hval << 10); hval ^= (hval >> 6); } hval += (hval << 3); hval ^= (hval >> 11); hval += (hval << 15); return hval; } /* * Local variables: * tab-width: 4 * c-basic-offset: 4 * End: * vim600: noet sw=4 ts=4 fdm=marker * vim<600: noet sw=4 ts=4 */
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