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|
/*
+----------------------------------------------------------------------+
| Copyright (c) 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> |
+----------------------------------------------------------------------+
*/
/* 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 = {
"joaat",
(php_hash_init_func_t) PHP_JOAATInit,
(php_hash_update_func_t) PHP_JOAATUpdate,
(php_hash_final_func_t) PHP_JOAATFinal,
php_hash_copy,
php_hash_serialize,
php_hash_unserialize,
PHP_JOAAT_SPEC,
4,
4,
sizeof(PHP_JOAAT_CTX),
0
};
PHP_HASH_API void PHP_JOAATInit(PHP_JOAAT_CTX *context, ZEND_ATTRIBUTE_UNUSED HashTable *args)
{
context->state = 0;
}
PHP_HASH_API void PHP_JOAATUpdate(PHP_JOAAT_CTX *context, const unsigned char *input, size_t inputLen)
{
context->state = joaat_buf((void *)input, inputLen, context->state);
}
PHP_HASH_API void PHP_JOAATFinal(unsigned char digest[4], PHP_JOAAT_CTX * context)
{
uint32_t hval = context->state;
hval += (hval << 3);
hval ^= (hval >> 11);
hval += (hval << 15);
#ifdef WORDS_BIGENDIAN
memcpy(digest, &hval, 4);
#else
int i = 0;
unsigned char *c = (unsigned char *) &hval;
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 uint32_t
joaat_buf(void *buf, size_t len, uint32_t 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);
}
return hval;
}
|
