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97b3b4552d
This allows consumers of just the CSPRNG to include a much smaller header. It also allows to verify at a glance whether a source file might use non-secure randomness. This commit includes the new header wherever the CSPRNG is used, possibly replacing the inclusion of php_random.h if nothing else is used, but also includes it in the main php_random.h header for compatibility. Somewhat related to45f8cfaf10,2b30f18708, andb14dd85dca.
91 lines
2.7 KiB
C
91 lines
2.7 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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| Author: Stig Sæther Bakken <ssb@php.net> |
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+----------------------------------------------------------------------+
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*/
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#include "php.h"
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#include <stdlib.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <string.h>
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#include <errno.h>
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#include <stdio.h>
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#ifdef PHP_WIN32
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#include "win32/time.h"
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#else
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#include <sys/time.h>
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#endif
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#include "ext/random/php_random.h"
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#include "ext/random/php_random_csprng.h"
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#ifdef HAVE_GETTIMEOFDAY
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ZEND_TLS struct timeval prev_tv = { 0, 0 };
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/* {{{ Generates a unique ID */
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PHP_FUNCTION(uniqid)
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{
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char *prefix = "";
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bool more_entropy = 0;
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zend_string *uniqid;
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int sec, usec;
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size_t prefix_len = 0;
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struct timeval tv;
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ZEND_PARSE_PARAMETERS_START(0, 2)
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Z_PARAM_OPTIONAL
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Z_PARAM_STRING(prefix, prefix_len)
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Z_PARAM_BOOL(more_entropy)
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ZEND_PARSE_PARAMETERS_END();
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/* This implementation needs current microsecond to change,
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* hence we poll time until it does. This is much faster than
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* calling usleep(1) which may cause the kernel to schedule
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* another process, causing a pause of around 10ms.
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*/
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do {
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(void)gettimeofday((struct timeval *) &tv, (struct timezone *) NULL);
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} while (tv.tv_sec == prev_tv.tv_sec && tv.tv_usec == prev_tv.tv_usec);
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prev_tv.tv_sec = tv.tv_sec;
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prev_tv.tv_usec = tv.tv_usec;
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sec = (int) tv.tv_sec;
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usec = (int) (tv.tv_usec % 0x100000);
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/* The max value usec can have is 0xF423F, so we use only five hex
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* digits for usecs.
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*/
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if (more_entropy) {
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uint32_t bytes;
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double seed;
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if (php_random_bytes_silent(&bytes, sizeof(uint32_t)) == FAILURE) {
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seed = php_combined_lcg() * 10;
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} else {
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seed = ((double) bytes / UINT32_MAX) * 10.0;
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}
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uniqid = strpprintf(0, "%s%08x%05x%.8F", prefix, sec, usec, seed);
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} else {
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uniqid = strpprintf(0, "%s%08x%05x", prefix, sec, usec);
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}
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RETURN_STR(uniqid);
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}
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#endif
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/* }}} */
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