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2b8c00850b
There's two problems: - Some loops used `unsigned int` instead of `size_t`. - The 2*N-bit addition that is emulated using 2 N bit numbers has a bug: it first truncated the number to 32/64 bit and only then shifted. This resulted in the wrong length info stored inside the resulting hash. Closes GH-12937.
75 lines
2.5 KiB
C
75 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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| https://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_adler32.h"
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PHP_HASH_API void PHP_ADLER32Init(PHP_ADLER32_CTX *context, ZEND_ATTRIBUTE_UNUSED HashTable *args)
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{
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context->state = 1;
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}
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PHP_HASH_API void PHP_ADLER32Update(PHP_ADLER32_CTX *context, const unsigned char *input, size_t len)
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{
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uint32_t s[2];
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s[0] = context->state & 0xffff;
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s[1] = (context->state >> 16) & 0xffff;
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for (size_t i = 0; i < len; ++i) {
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s[0] += input[i];
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s[1] += s[0];
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if (s[1]>=0x7fffffff)
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{
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s[0] = s[0] % 65521;
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s[1] = s[1] % 65521;
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}
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}
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s[0] = s[0] % 65521;
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s[1] = s[1] % 65521;
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context->state = s[0] + (s[1] << 16);
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}
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PHP_HASH_API void PHP_ADLER32Final(unsigned char digest[4], PHP_ADLER32_CTX *context)
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{
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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_ADLER32Copy(const php_hash_ops *ops, PHP_ADLER32_CTX *orig_context, PHP_ADLER32_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_adler32_ops = {
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"adler32",
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(php_hash_init_func_t) PHP_ADLER32Init,
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(php_hash_update_func_t) PHP_ADLER32Update,
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(php_hash_final_func_t) PHP_ADLER32Final,
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(php_hash_copy_func_t) PHP_ADLER32Copy,
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php_hash_serialize,
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php_hash_unserialize,
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PHP_ADLER32_SPEC,
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4, /* what to say here? */
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4,
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sizeof(PHP_ADLER32_CTX),
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0
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};
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