crypt.php ➔ McryptSmplIvDecrypt() - Code Metrics - fwolf/fwlib - Measure and Improve Code Quality continuously with Scrutinizer

crypt.php ➔ McryptSmplIvDecrypt() A
last analyzed 2019-05-09 15:53 UTC

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Complexity

Conditions	1
Paths	1

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	1
nc	1
nop	6
dl	0
loc	3
rs	10
c	0
b	0
f	0

<?php
/**
 * Func about encrypt and decrypt.
 *
 * @package     fwolflib
 * @subpackage	func
 * @copyright   Copyright 2009-2010, Fwolf
 * @author      Fwolf <[email protected]>
 * @since		2009-10-22
 */


require_once(dirname(__FILE__) . '/../fwolflib.php');
require_once(FWOLFLIB . 'func/ecl.php');
require_once(FWOLFLIB . 'func/env.php');

if (!function_exists('mcrypt_module_open'))
	die('Module mcrypt not installed.');


// Get mcrypt supported algorithms:
/*
$algorithms = mcrypt_list_algorithms("/usr/local/lib/libmcrypt");

foreach ($algorithms as $cipher) {
	echo "$cipher\n";
}
*/
/*
cast-128
gost
rijndael-128
twofish
arcfour
cast-256
loki97
rijndael-192
saferplus
wake
blowfish-compat
des
rijndael-256
serpent
xtea
blowfish
enigma
rc2
tripledes
*/


/*
 * McryptSmplIv
 *
 * Use part of secret key as IV, so need assign it from outside,
 * or save it to use when decrypt.
 */


/**
 * Do decrypt
 *
 * @deprecated      Use Fwlib\Util\McryptSmplIv::decrypt()
 * @param	string	$s_data					Source data.
 * @param	string	$s_key					Secret key.
 * @param	string	$algorithm				Same as mcrypt_module_open().
 * @param	string	$algorithm_directory	Same as mcrypt_module_open().
 * @param	string	$mode					Same as mcrypt_module_open().
 * @param	string	$mode_directory			Same as mcrypt_module_open().
 * @return	string
*/
function McryptSmplIvDecrypt($s_data, $s_key, $algorithm, $algorithm_directory = '', $mode = 'cfb', $mode_directory = '') {
	return McryptSmplIvProcess(1, $s_data, $s_key, $algorithm, $algorithm_directory, $mode, $mode_directory);

} // end of func McryptSmplIvDecrypt


/**
 * Do encrypt
 *
 * @deprecated      Use Fwlib\Util\McryptSmplIv::encrypt()
 * @param	string	$s_data					Source data.
 * @param	string	$s_key					Secret key.
 * @param	string	$algorithm				Same as mcrypt_module_open().
 * @param	string	$algorithm_directory	Same as mcrypt_module_open().
 * @param	string	$mode					Same as mcrypt_module_open().
 * @param	string	$mode_directory			Same as mcrypt_module_open().
 * @return	string
*/
function McryptSmplIvEncrypt($s_data, $s_key, $algorithm, $algorithm_directory = '', $mode = 'cfb', $mode_directory = '') {
	return McryptSmplIvProcess(0, $s_data, $s_key, $algorithm, $algorithm_directory, $mode, $mode_directory);

} // end of func McryptSmplIvEncrypt


/**
 * Real process func McryptSmplIv
 *
 * @deprecated      Use Fwlib\Util\McryptSmplIv::process()
 * @param	int		$i_action				0=encrypt, else=decrypt.
 * @param	string	$s_data					Source data.
 * @param	string	$s_key					Secret key.
 * @param	string	$algorithm				Same as mcrypt_module_open().
 * @param	string	$algorithm_directory	Same as mcrypt_module_open().
 * @param	string	$mode					Same as mcrypt_module_open().
 * @param	string	$mode_directory			Same as mcrypt_module_open().
 * @return	string
*/
function McryptSmplIvProcess($i_action, $s_data, $s_key, $algorithm, $algorithm_directory = '', $mode = 'cfb', $mode_directory = '') {

	/* Open the cipher */
	$td = mcrypt_module_open($algorithm,
		$algorithm_directory,
		$mode,
		$mode_directory);

	$ks = mcrypt_enc_get_key_size($td);

	/* Create key */
	$key = substr(sha1($s_key), 0, $ks);

	// The IV must be unique and must be the same when decrypting/encrypting.

	// But encrypt/decrypt are executed on 2 machine,
	// randon IV will cause decrypt wrong result
	// Bad offical example, all put encrypt/decrypt together !

	/* Create the IV and determine the keysize length, use MCRYPT_RAND
	 * on Windows instead */
/*
	if (true == NixOs())
		$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_DEV_RANDOM);
	else
		$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
*/

	// So now, I use part/duplicate sha1 value of key as IV
	$iv = sha1($key);	// Sha1 again :-)
	$l_sha1 = strlen($iv);
	$l_iv = mcrypt_enc_get_iv_size($td);
	if ($l_sha1 < $l_iv) {
		// Duplicate sha1 value to generate IV
		$iv = str_repeat($iv, round($l_iv / $l_sha1) + 1);
	}
	$iv = substr($iv, 0, $l_iv);

	/* Intialize encryption */
	mcrypt_generic_init($td, $key, $iv);

	if (0 == $i_action) {
		/* Encrypt data */
		$encrypted = mcrypt_generic($td, $s_data);
	}
	else {
		/* Decrypt encrypted string */
		$encrypted = mdecrypt_generic($td, $s_data);
	}

	/* Terminate decryption handle and close module */
	mcrypt_generic_deinit($td);
	mcrypt_module_close($td);

	return($encrypted);
} // end of func McryptSmplIvProcess

?>



1		<?php
2		/**
3		* Func about encrypt and decrypt.
4		*
5		* @package fwolflib
6		* @subpackage func
7		* @copyright Copyright 2009-2010, Fwolf
8		* @author Fwolf <[email protected]>
9		* @since 2009-10-22
10		*/
11
12
13		require_once(dirname(__FILE__) . '/../fwolflib.php');
14		require_once(FWOLFLIB . 'func/ecl.php');
15		require_once(FWOLFLIB . 'func/env.php');
16
17		if (!function_exists('mcrypt_module_open'))
18		die('Module mcrypt not installed.');
19
20
21		// Get mcrypt supported algorithms:
22		/*
23		$algorithms = mcrypt_list_algorithms("/usr/local/lib/libmcrypt");
24
25		foreach ($algorithms as $cipher) {
26		echo "$cipher\n";
27		}
28		*/
29		/*
30		cast-128
31		gost
32		rijndael-128
33		twofish
34		arcfour
35		cast-256
36		loki97
37		rijndael-192
38		saferplus
39		wake
40		blowfish-compat
41		des
42		rijndael-256
43		serpent
44		xtea
45		blowfish
46		enigma
47		rc2
48		tripledes
49		*/
50
51
52		/*
53		* McryptSmplIv
54		*
55		* Use part of secret key as IV, so need assign it from outside,
56		* or save it to use when decrypt.
57		*/
58
59
60		/**
61		* Do decrypt
62		*
63		* @deprecated Use Fwlib\Util\McryptSmplIv::decrypt()
64		* @param string $s_data Source data.
65		* @param string $s_key Secret key.
66		* @param string $algorithm Same as mcrypt_module_open().
67		* @param string $algorithm_directory Same as mcrypt_module_open().
68		* @param string $mode Same as mcrypt_module_open().
69		* @param string $mode_directory Same as mcrypt_module_open().
70		* @return string
71		*/
72		function McryptSmplIvDecrypt($s_data, $s_key, $algorithm, $algorithm_directory = '', $mode = 'cfb', $mode_directory = '') {
73		return McryptSmplIvProcess(1, $s_data, $s_key, $algorithm, $algorithm_directory, $mode, $mode_directory);
		0 ignored issues – show Deprecated Code introduced 2016-06-01 06:17 UTC by Report Bug Copy Issue Report The function `McryptSmplIvProcess()` has been deprecated with message: Use Fwlib\Util\McryptSmplIv::process() This function has been deprecated. The supplier of the file has supplied an explanatory message. The explanatory message should give you some clue as to whether and when the function will be removed from the class and what other function to use instead. Loading history...
74		} // end of func McryptSmplIvDecrypt
75
76
77		/**
78		* Do encrypt
79		*
80		* @deprecated Use Fwlib\Util\McryptSmplIv::encrypt()
81		* @param string $s_data Source data.
82		* @param string $s_key Secret key.
83		* @param string $algorithm Same as mcrypt_module_open().
84		* @param string $algorithm_directory Same as mcrypt_module_open().
85		* @param string $mode Same as mcrypt_module_open().
86		* @param string $mode_directory Same as mcrypt_module_open().
87		* @return string
88		*/
89		function McryptSmplIvEncrypt($s_data, $s_key, $algorithm, $algorithm_directory = '', $mode = 'cfb', $mode_directory = '') {
90		return McryptSmplIvProcess(0, $s_data, $s_key, $algorithm, $algorithm_directory, $mode, $mode_directory);
		0 ignored issues – show Deprecated Code introduced 2016-06-01 06:17 UTC by Report Bug Copy Issue Report The function `McryptSmplIvProcess()` has been deprecated with message: Use Fwlib\Util\McryptSmplIv::process() This function has been deprecated. The supplier of the file has supplied an explanatory message. The explanatory message should give you some clue as to whether and when the function will be removed from the class and what other function to use instead. Loading history...
91		} // end of func McryptSmplIvEncrypt
92
93
94		/**
95		* Real process func McryptSmplIv
96		*
97		* @deprecated Use Fwlib\Util\McryptSmplIv::process()
98		* @param int $i_action 0=encrypt, else=decrypt.
99		* @param string $s_data Source data.
100		* @param string $s_key Secret key.
101		* @param string $algorithm Same as mcrypt_module_open().
102		* @param string $algorithm_directory Same as mcrypt_module_open().
103		* @param string $mode Same as mcrypt_module_open().
104		* @param string $mode_directory Same as mcrypt_module_open().
105		* @return string
106		*/
107	View Code Duplication	function McryptSmplIvProcess($i_action, $s_data, $s_key, $algorithm, $algorithm_directory = '', $mode = 'cfb', $mode_directory = '') {
		0 ignored issues – show Duplication introduced 2016-06-01 06:17 UTC by Report Bug Copy Issue Report This function seems to be duplicated in your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
108		/* Open the cipher */
109		$td = mcrypt_module_open($algorithm,
110		$algorithm_directory,
111		$mode,
112		$mode_directory);
113
114		$ks = mcrypt_enc_get_key_size($td);
115
116		/* Create key */
117		$key = substr(sha1($s_key), 0, $ks);
118
119		// The IV must be unique and must be the same when decrypting/encrypting.
120
121		// But encrypt/decrypt are executed on 2 machine,
122		// randon IV will cause decrypt wrong result
123		// Bad offical example, all put encrypt/decrypt together !
124
125		/* Create the IV and determine the keysize length, use MCRYPT_RAND
126		* on Windows instead */
127		/*
128		if (true == NixOs())
129		$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_DEV_RANDOM);
130		else
131		$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
132		*/
133
134		// So now, I use part/duplicate sha1 value of key as IV
135		$iv = sha1($key); // Sha1 again :-)
136		$l_sha1 = strlen($iv);
137		$l_iv = mcrypt_enc_get_iv_size($td);
138		if ($l_sha1 < $l_iv) {
139		// Duplicate sha1 value to generate IV
140		$iv = str_repeat($iv, round($l_iv / $l_sha1) + 1);
141		}
142		$iv = substr($iv, 0, $l_iv);
143
144		/* Intialize encryption */
145		mcrypt_generic_init($td, $key, $iv);
146
147		if (0 == $i_action) {
148		/* Encrypt data */
149		$encrypted = mcrypt_generic($td, $s_data);
150		}
151		else {
152		/* Decrypt encrypted string */
153		$encrypted = mdecrypt_generic($td, $s_data);
154		}
155
156		/* Terminate decryption handle and close module */
157		mcrypt_generic_deinit($td);
158		mcrypt_module_close($td);
159
160		return($encrypted);
161		} // end of func McryptSmplIvProcess
162
163		?>
		0 ignored issues – show Best Practice introduced 2016-06-01 06:17 UTC by Report Bug Copy Issue Report It is not recommended to use PHP's closing tag `?>` in files other than templates. Using a closing tag in PHP files that only contain PHP code is not recommended as you might accidentally add whitespace after the closing tag which would then be output by PHP. This can cause severe problems, for example headers cannot be sent anymore. A simple precaution is to leave off the closing tag as it is not required, and it also has no negative effects whatsoever. Loading history...
164

fwolf / fwlib

crypt.php ➔ McryptSmplIvDecrypt() A last analyzed 2019-05-09 15:53 UTC

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crypt.php ➔ McryptSmplIvDecrypt() A
last analyzed 2019-05-09 15:53 UTC