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ada776c84c
* Modify php_hash_ops to contain the algorithm name and serialize and unserialize methods. * Implement __serialize and __unserialize magic methods on HashContext. Note that serialized HashContexts are not necessarily portable between PHP versions or from architecture to architecture. (Most are, though Keccak and slow SHA3s are not.) An exception is thrown when an unsupported serialization is attempted. Because of security concerns, HASH_HMAC contexts are not currently serializable; attempting to serialize one throws an exception. Serialization exposes the state of HashContext memory, so ensure that memory is zeroed before use by allocating it with a new php_hash_alloc_context function. Performance impact is negligible. Some hash internal states have logical pointers into a buffer, or sponge, that absorbs input provided in bytes rather than chunks. The unserialize functions for these hash functions must validate that the logical pointers are all within bounds, lest future hash operations cause out-of-bounds memory accesses. * Adler32, CRC32, FNV, joaat: simple state, no buffer positions * Gost, MD2, SHA3, Snefru, Tiger, Whirlpool: buffer positions must be validated * MD4, MD5, SHA1, SHA2, haval, ripemd: buffer positions encoded bitwise, forced to within bounds on use; no need to validate
93 lines
2.5 KiB
C
93 lines
2.5 KiB
C
/*
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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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| Author: Martin Jansen <mj@php.net> |
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+----------------------------------------------------------------------+
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*/
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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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"joaat",
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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,
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php_hash_serialize,
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php_hash_unserialize,
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PHP_JOAAT_SPEC,
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4,
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4,
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sizeof(PHP_JOAAT_CTX),
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0
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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, size_t 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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uint32_t hval = context->state;
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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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#ifdef WORDS_BIGENDIAN
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memcpy(digest, &hval, 4);
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#else
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int i = 0;
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unsigned char *c = (unsigned char *) &hval;
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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 uint32_t
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joaat_buf(void *buf, size_t len, uint32_t 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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return hval;
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}
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