text: /*
     +----------------------------------------------------------------------+
     | 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:           |
     | https://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.               |
     +----------------------------------------------------------------------+
     | Authors: Pierre Alain Joye  <pajoye@php.net                          |
     +----------------------------------------------------------------------+
   */
  
  /*
   * License for the Unix md5crypt implementation (md5_crypt):
   *
   * ----------------------------------------------------------------------------
   * "THE BEER-WARE LICENSE" (Revision 42):
   * <phk@login.dknet.dk> wrote this file.  As long as you retain this notice you
   * can do whatever you want with this stuff. If we meet some day, and you think
   * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
   * ----------------------------------------------------------------------------
   *
   * from FreeBSD: crypt.c,v 1.5 1996/10/14 08:34:02 phk Exp
   * via OpenBSD: md5crypt.c,v 1.9 1997/07/23 20:58:27 kstailey Exp
   * via NetBSD: md5crypt.c,v 1.4.2.1 2002/01/22 19:31:59 he Exp
   *
   */
  
  #include "php.h"
  
  #include <string.h>
  
  #ifdef PHP_WIN32
  # include <windows.h>
  # include <Wincrypt.h>
  #endif
  
  #include "php_crypt_r.h"
  #include "crypt_freesec.h"
  #include "ext/standard/md5.h"
  
  #ifdef ZTS
  MUTEX_T php_crypt_extended_init_lock;
  #endif
  
  void php_init_crypt_r()
  {
  #ifdef ZTS
  	php_crypt_extended_init_lock = tsrm_mutex_alloc();
  #endif
  }
  
  void php_shutdown_crypt_r()
  {
  #ifdef ZTS
  	tsrm_mutex_free(php_crypt_extended_init_lock);
  #endif
  }
  
  void _crypt_extended_init_r(void)
  {
  	static int initialized = 0;
  
  #ifdef ZTS
  	tsrm_mutex_lock(php_crypt_extended_init_lock);
  #endif
  
  	if (!initialized) {
  		initialized = 1;
  		_crypt_extended_init();
  	}
  
  #ifdef ZTS
  	tsrm_mutex_unlock(php_crypt_extended_init_lock);
  #endif
  }
  
  /* MD5 crypt implementation using the windows CryptoApi */
  #define MD5_MAGIC "$1$"
  #define MD5_MAGIC_LEN 3
  
  static const unsigned char itoa64[] =		/* 0 ... 63 => ascii - 64 */
  	"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
  
  /* Convert a 16/32 bit integer to Base64 string representation */
  static void to64(char *s, int32_t v, int n)
  {
  	while (--n >= 0) {
  		*s++ = itoa64[v & 0x3f];
  		v >>= 6;
  	}
  }
  
  /*
   * MD5 password encryption.
   */
  char * php_md5_crypt_r(const char *pw, const char *salt, char *out)
  {
  	ZEND_TLS char passwd[MD5_HASH_MAX_LEN], *p;
  	const char *sp, *ep;
  	unsigned char final[16];
  	unsigned int i, sl, pwl;
  	PHP_MD5_CTX	ctx, ctx1;
  	uint32_t l;
  	int pl;
  
  	pwl = strlen(pw);
  
  	/* Refine the salt first */
  	sp = salt;
  
  	/* If it starts with the magic string, then skip that */
  	if (strncmp(sp, MD5_MAGIC, MD5_MAGIC_LEN) == 0)
  		sp += MD5_MAGIC_LEN;
  
  	/* It stops at the first '$', max 8 chars */
  	for (ep = sp; *ep != '\0' && *ep != '$' && ep < (sp + 8); ep++);
  
  	/* get the length of the true salt */
  	sl = ep - sp;
  
  	PHP_MD5Init(&ctx);
  
  	/* The password first, since that is what is most unknown */
  	PHP_MD5Update(&ctx, (const unsigned char *)pw, pwl);
  
  	/* Then our magic string */
  	PHP_MD5Update(&ctx, (const unsigned char *)MD5_MAGIC, MD5_MAGIC_LEN);
  
  	/* Then the raw salt */
  	PHP_MD5Update(&ctx, (const unsigned char *)sp, sl);
  
  	/* Then just as many characters of the MD5(pw,salt,pw) */
  	PHP_MD5Init(&ctx1);
  	PHP_MD5Update(&ctx1, (const unsigned char *)pw, pwl);
  	PHP_MD5Update(&ctx1, (const unsigned char *)sp, sl);
  	PHP_MD5Update(&ctx1, (const unsigned char *)pw, pwl);
  	PHP_MD5Final(final, &ctx1);
  
  	for (pl = pwl; pl > 0; pl -= 16)
  		PHP_MD5Update(&ctx, final, (unsigned int)(pl > 16 ? 16 : pl));
  
  	/* Don't leave anything around in vm they could use. */
  	ZEND_SECURE_ZERO(final, sizeof(final));
  
  	/* Then something really weird... */
  	for (i = pwl; i != 0; i >>= 1)
  		if ((i & 1) != 0)
  		    PHP_MD5Update(&ctx, final, 1);
  		else
  		    PHP_MD5Update(&ctx, (const unsigned char *)pw, 1);
  
  	/* Now make the output string */
  	memcpy(passwd, MD5_MAGIC, MD5_MAGIC_LEN);
  	strlcpy(passwd + MD5_MAGIC_LEN, sp, sl + 1);
  	strcat(passwd, "$");
  
  	PHP_MD5Final(final, &ctx);
  
  	/*
  	 * And now, just to make sure things don't run too fast. On a 60 MHz
  	 * Pentium this takes 34 msec, so you would need 30 seconds to build
  	 * a 1000 entry dictionary...
  	 */
  	for (i = 0; i < 1000; i++) {
  		PHP_MD5Init(&ctx1);
  
  		if ((i & 1) != 0)
  			PHP_MD5Update(&ctx1, (const unsigned char *)pw, pwl);
  		else
  			PHP_MD5Update(&ctx1, final, 16);
  
  		if ((i % 3) != 0)
  			PHP_MD5Update(&ctx1, (const unsigned char *)sp, sl);
  
  		if ((i % 7) != 0)
  			PHP_MD5Update(&ctx1, (const unsigned char *)pw, pwl);
  
  		if ((i & 1) != 0)
  			PHP_MD5Update(&ctx1, final, 16);
  		else
  			PHP_MD5Update(&ctx1, (const unsigned char *)pw, pwl);
  
  		PHP_MD5Final(final, &ctx1);
  	}
  
  	p = passwd + sl + MD5_MAGIC_LEN + 1;
  
  	l = (final[ 0]<<16) | (final[ 6]<<8) | final[12]; to64(p,l,4); p += 4;
  	l = (final[ 1]<<16) | (final[ 7]<<8) | final[13]; to64(p,l,4); p += 4;
  	l = (final[ 2]<<16) | (final[ 8]<<8) | final[14]; to64(p,l,4); p += 4;
  	l = (final[ 3]<<16) | (final[ 9]<<8) | final[15]; to64(p,l,4); p += 4;
  	l = (final[ 4]<<16) | (final[10]<<8) | final[ 5]; to64(p,l,4); p += 4;
  	l =		       final[11]		; to64(p,l,2); p += 2;
  	*p = '\0';
  
  	/* Don't leave anything around in vm they could use. */
  	ZEND_SECURE_ZERO(final, sizeof(final));
  	return (passwd);
  }
  