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100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
/*
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+----------------------------------------------------------------------+
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| PHP Version 5 |
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+----------------------------------------------------------------------+
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| Copyright (c) 1997-2012 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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| Author: Martin Jansen <mj@php.net> |
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+----------------------------------------------------------------------+
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*/
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/* $Id$ */
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/* Implements Jenkins's one-at-a-time hashing algorithm as presented on
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* http://www.burtleburtle.net/bob/hash/doobs.html.
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*/
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#include "php_hash.h"
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#include "php_hash_joaat.h"
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const php_hash_ops php_hash_joaat_ops = {
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(php_hash_init_func_t) PHP_JOAATInit,
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(php_hash_update_func_t) PHP_JOAATUpdate,
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(php_hash_final_func_t) PHP_JOAATFinal,
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(php_hash_copy_func_t) php_hash_copy,
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4,
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4,
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sizeof(PHP_JOAAT_CTX)
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};
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PHP_HASH_API void PHP_JOAATInit(PHP_JOAAT_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_JOAATUpdate(PHP_JOAAT_CTX *context, const unsigned char *input, unsigned int inputLen)
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{
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context->state = joaat_buf((void *)input, inputLen, context->state);
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}
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PHP_HASH_API void PHP_JOAATFinal(unsigned char digest[4], PHP_JOAAT_CTX * context)
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{
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#ifdef WORDS_BIGENDIAN
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memcpy(digest, &context->state, 4);
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#else
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int i = 0;
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unsigned char *c = (unsigned char *) &context->state;
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for (i = 0; i < 4; i++) {
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digest[i] = c[3 - i];
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}
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#endif
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context->state = 0;
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}
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/*
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* joaat_buf - perform a Jenkins's one-at-a-time hash on a buffer
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*
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* input:
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* buf - start of buffer to hash
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* len - length of buffer in octets
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*
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* returns:
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* 32 bit hash as a static hash type
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*/
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static php_hash_uint32
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joaat_buf(void *buf, size_t len, php_hash_uint32 hval)
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{
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size_t i;
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unsigned char *input = (unsigned char *)buf;
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for (i = 0; i < len; i++) {
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hval += input[i];
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hval += (hval << 10);
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hval ^= (hval >> 6);
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}
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hval += (hval << 3);
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hval ^= (hval >> 11);
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hval += (hval << 15);
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return hval;
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}
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/*
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* Local variables:
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* tab-width: 4
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* c-basic-offset: 4
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* End:
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* vim600: noet sw=4 ts=4 fdm=marker
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* vim<600: noet sw=4 ts=4
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*/
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