Online PHP editor | perf for 6XpV5

@ 2016-01-17T07:31:51Z

<?php
	
	// This PHP code snippet provides a basic understanding of 
	// PHP's AES encryption.

	// The first thing to understand is the meaning of these constants:
	// MCRYPT_RIJNDAEL_128
	// MCRYPT_RIJNDAEL_192
	// MCRYPT_RIJNDAEL_256
	// You would think that MCRYPT_RIJNDAEL_256 specifies 256-bit encryption,
	// but that is wrong.  The three choices specify the block-size to be used
	// with Rijndael encryption.  They say nothing about the key size (i.e. strength)
	// of the encryption.  (Read further to understand how the strength of the
	// AES encryption is set.)
	//
	// The Rijndael encyrption algorithm is a block cipher.  It operates on discrete 
	// blocks of data.  Padding MUST be added such that
    // the data to be encrypted has a length that is a multiple of the block size.
	// (PHP pads with NULL bytes)
	// Thus, if you specify MCRYPT_RIJNDAEL_256, your encrypted output will always
	// be a multiple of 32 bytes (i.e. 256 bits).  If you specify MCRYPT_RIJNDAEL_128,
	// your encrypted output will always be a multiple of 16 bytes.
	//
	// Note: Strictly speaking, AES is not precisely Rijndael (although in practice 
	// they are used interchangeably) as Rijndael supports a larger range of block 
	// and key sizes; AES has a fixed block size of 128 bits and a key size of 
	// 128, 192, or 256 bits, whereas Rijndael can be specified with key and block 
	// sizes in any multiple of 32 bits, with a minimum of 128 bits and a maximum of 
	// 256 bits.
	// In summary: If you want to be AES compliant, always choose MCRYPT_RIJNDAEL_128.
	//
	// So the first step is to create the cipher object:
	$cipher = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CFB, '');
	
	// We're using CBC mode (cipher-block chaining).  Block cipher modes are detailed
	// here: http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation
		
	// CBC mode requires an initialization vector.  The size of the IV (initialization
	// vector) is always equal to the block-size.  (It is NOT equal to the key size.)
	// Given that our block size is 128-bits, the IV is also 128-bits (i.e. 16 bytes).
	// Thus, for AES encryption, the IV is always 16 bytes regardless of the 
	// strength of encryption.
	// 
	// Here's some PHP code to verify our IV size:
	$iv_size = mcrypt_enc_get_iv_size($cipher);
	printf("iv_size = %d\n",$iv_size);
	
	// How do you do 256-bit AES encryption in PHP vs. 128-bit AES encryption???
	// The answer is:  Give it a key that's 32 bytes long as opposed to 16 bytes long.
	// For example:
	$key256 = 'a7fc844d17f43955783d7d6f5df7eb4e';
	
	// Here's our 128-bit IV which is used for both 256-bit and 128-bit keys.
	$iv =  '1234567890123456';
	
	printf("iv: %s\n",bin2hex($iv));
	printf("key256: %s\n",bin2hex($key256));
	printf("key128: %s\n",bin2hex($key128));
	
	// This is the plain-text to be encrypted:
	$cleartext = '5854889097648545';
	printf("plainText: %s\n\n",$cleartext);
		
	// The mcrypt_generic_init function initializes the cipher by specifying both
	// the key and the IV.  The length of the key determines whether we're doing
	// 128-bit, 192-bit, or 256-bit encryption.  
	// Let's do 256-bit encryption here:
	if (mcrypt_generic_init($cipher, $key256, $iv) != -1)
	{
		// PHP pads with NULL bytes if $cleartext is not a multiple of the block size..
		$cipherText = mcrypt_generic($cipher,$cleartext );
		mcrypt_generic_deinit($cipher);
		
		// Display the result in hex.
		printf("256-bit encrypted result:\n%s\n\n",bin2hex($cipherText));
	}
	
	// -------
	// Results
	// -------
	// You may use these as test vectors for testing your AES implementations...
	// 
	// ------------------------
	// 256-bit key, CBC mode
	// ------------------------
	// IV = '1234567890123456'  
	//  (hex: 31323334353637383930313233343536)
	// Key = '12345678901234561234567890123456'  
	//  (hex: 3132333435363738393031323334353631323334353637383930313233343536)
	// PlainText:
	//  'The quick brown fox jumped over the lazy dog'
	// CipherText(hex):
	//  2fddc3abec692e1572d9b7d629172a05caf230bc7c8fd2d26ccfd65f9c54526984f7cb1c4326ef058cd7bee3967299e3

	// 
	// ------------------------
	// 128-bit key, CBC mode
	// ------------------------
	// IV = '1234567890123456'  
	//  (hex: 31323334353637383930313233343536)
	// Key = '1234567890123456'  
	//  (hex: 31323334353637383930313233343536)
	// PlainText:
	//  'The quick brown fox jumped over the lazy dog'
	// CipherText(hex):
	//  f78176ae8dfe84578529208d30f446bbb29a64dc388b5c0b63140a4f316b3f341fe7d3b1a3cc5113c81ef8dd714a1c99
	
?>

Here you find the average performance (time & memory) of each version. A grayed out version indicates it didn't complete successfully (based on exit-code).

Version	System time (s)	User time (s)	Memory (MiB)
8.3.6	0.011	0.004	16.50
8.3.5	0.008	0.008	17.80
8.3.4	0.007	0.010	18.92
8.3.3	0.007	0.007	18.79
8.3.2	0.005	0.002	20.15
8.3.1	0.006	0.006	18.69
8.3.0	0.006	0.003	21.85
8.2.18	0.017	0.003	16.63
8.2.17	0.004	0.011	22.96
8.2.16	0.007	0.007	22.26
8.2.15	0.000	0.008	24.18
8.2.14	0.008	0.000	24.66
8.2.13	0.004	0.004	20.79
8.2.12	0.004	0.004	26.35
8.2.11	0.007	0.004	19.09
8.2.10	0.008	0.004	17.80
8.2.9	0.004	0.004	19.09
8.2.8	0.004	0.004	17.97
8.2.7	0.004	0.004	17.63
8.2.6	0.008	0.000	17.91
8.2.5	0.005	0.003	18.09
8.2.4	0.000	0.008	22.27
8.2.3	0.005	0.003	19.34
8.2.2	0.007	0.000	17.71
8.2.1	0.000	0.007	18.09
8.2.0	0.002	0.005	18.07
8.1.28	0.015	0.003	25.92
8.1.27	0.000	0.008	22.06
8.1.26	0.000	0.008	28.09
8.1.25	0.005	0.003	28.09
8.1.24	0.007	0.003	22.04
8.1.23	0.003	0.007	17.70
8.1.22	0.000	0.008	17.74
8.1.21	0.004	0.004	18.77
8.1.20	0.008	0.003	17.22
8.1.19	0.000	0.008	17.13
8.1.18	0.004	0.004	18.10
8.1.17	0.000	0.008	18.49
8.1.16	0.004	0.004	20.68
8.1.15	0.005	0.005	18.86
8.1.14	0.003	0.005	19.48
8.1.13	0.003	0.003	17.52
8.1.12	0.008	0.000	17.25
8.1.11	0.003	0.005	17.26
8.1.10	0.000	0.007	17.40
8.1.9	0.004	0.004	17.39
8.1.8	0.000	0.008	17.35
8.1.7	0.003	0.003	17.40
8.1.6	0.000	0.007	17.52
8.1.5	0.000	0.008	17.37
8.1.4	0.005	0.003	17.41
8.1.3	0.000	0.008	17.62
8.1.2	0.007	0.000	17.50
8.1.1	0.000	0.008	17.54
8.1.0	0.000	0.008	17.44
8.0.30	0.008	0.000	18.78
8.0.29	0.000	0.009	16.63
8.0.28	0.006	0.003	18.27
8.0.27	0.005	0.002	17.21
8.0.26	0.000	0.008	17.28
8.0.25	0.003	0.003	17.00
8.0.24	0.000	0.007	16.96
8.0.23	0.003	0.003	16.94
8.0.22	0.003	0.006	16.95
8.0.21	0.004	0.004	16.98
8.0.20	0.007	0.000	16.86
8.0.19	0.005	0.002	16.96
8.0.18	0.000	0.007	16.98
8.0.17	0.000	0.007	16.95
8.0.16	0.004	0.004	17.00
8.0.15	0.000	0.007	16.86
8.0.14	0.003	0.006	16.83
8.0.13	0.003	0.003	13.33
8.0.12	0.005	0.003	16.86
8.0.11	0.004	0.004	16.77
8.0.10	0.004	0.004	16.86
8.0.9	0.010	0.000	16.80
8.0.8	0.008	0.008	16.98
8.0.7	0.000	0.007	16.79
8.0.6	0.005	0.002	16.73
8.0.5	0.000	0.007	16.92
8.0.3	0.010	0.007	17.10
8.0.2	0.012	0.006	17.40
8.0.1	0.007	0.000	17.02
8.0.0	0.010	0.008	16.77
7.4.33	0.000	0.005	16.79
7.4.32	0.000	0.007	16.41
7.4.30	0.000	0.008	16.61
7.4.29	0.007	0.000	16.45
7.4.28	0.004	0.004	16.51
7.4.27	0.003	0.003	16.57
7.4.26	0.004	0.004	16.57
7.4.25	0.002	0.005	16.55
7.4.24	0.003	0.003	16.39
7.4.23	0.000	0.007	16.56
7.4.22	0.018	0.000	16.57
7.4.21	0.008	0.006	16.65
7.4.20	0.003	0.003	16.61
7.4.16	0.014	0.003	16.44
7.4.15	0.008	0.009	17.40
7.4.14	0.010	0.010	17.86
7.4.13	0.010	0.008	16.50
7.4.12	0.009	0.012	16.69
7.4.11	0.010	0.007	16.41
7.4.10	0.009	0.010	16.45
7.4.9	0.006	0.012	16.56
7.4.8	0.008	0.008	19.39
7.4.7	0.010	0.007	16.46
7.4.6	0.009	0.009	16.43
7.4.5	0.008	0.004	16.50
7.4.4	0.006	0.009	16.61
7.4.3	0.006	0.012	16.48
7.4.0	0.005	0.012	14.91
7.3.33	0.005	0.000	13.03
7.3.32	0.002	0.002	13.04
7.3.31	0.003	0.005	16.42
7.3.30	0.003	0.003	16.19
7.3.29	0.005	0.010	16.30
7.3.28	0.009	0.007	16.30
7.3.27	0.011	0.007	17.40
7.3.26	0.014	0.006	16.34
7.3.25	0.010	0.009	16.27
7.3.24	0.013	0.006	16.28
7.3.23	0.012	0.006	16.46
7.3.21	0.011	0.007	16.56
7.3.20	0.010	0.006	16.28
7.3.19	0.006	0.011	16.54
7.3.18	0.013	0.003	16.30
7.3.17	0.010	0.007	16.32
7.3.16	0.008	0.008	16.43
7.3.12	0.015	0.003	14.96
7.3.11	0.006	0.012	15.05
7.3.10	0.000	0.015	14.79
7.3.9	0.003	0.007	14.93
7.3.8	0.009	0.000	14.97
7.3.7	0.003	0.007	14.65
7.3.6	0.011	0.003	14.50
7.3.5	0.004	0.004	14.59
7.3.4	0.013	0.000	14.76
7.3.3	0.006	0.012	14.78
7.3.2	0.004	0.008	16.79
7.3.1	0.000	0.016	16.59
7.3.0	0.003	0.007	16.59
7.2.33	0.010	0.007	16.25
7.2.32	0.010	0.006	16.60
7.2.31	0.013	0.006	16.49
7.2.30	0.008	0.008	16.64
7.2.29	0.006	0.009	16.33
7.2.25	0.007	0.011	14.94
7.2.24	0.007	0.010	15.17
7.2.23	0.007	0.007	14.71
7.2.22	0.006	0.003	14.90
7.2.21	0.009	0.003	14.74
7.2.20	0.000	0.014	15.02
7.2.19	0.006	0.009	14.68
7.2.18	0.007	0.011	15.05
7.2.17	0.003	0.013	14.79
7.2.6	0.006	0.006	16.59
7.2.0	0.009	0.006	18.95
7.1.33	0.003	0.009	15.45
7.1.32	0.006	0.006	15.34
7.1.31	0.000	0.012	15.36
7.1.30	0.003	0.006	15.67
7.1.29	0.005	0.005	15.63
7.1.28	0.003	0.009	15.71
7.1.27	0.004	0.011	15.36
7.1.26	0.000	0.008	15.64
7.1.20	0.006	0.000	15.40
7.1.10	0.004	0.007	17.91
7.1.7	0.000	0.007	16.90
7.1.6	0.014	0.010	19.40
7.1.5	0.010	0.010	16.81
7.1.0	0.003	0.077	22.51
7.0.20	0.004	0.004	16.52
7.0.6	0.027	0.057	21.66
7.0.5	0.007	0.080	17.73
7.0.4	0.010	0.073	20.01
7.0.3	0.050	0.070	20.18
7.0.2	0.033	0.050	20.04
7.0.1	0.007	0.040	20.33
7.0.0	0.003	0.043	20.20
5.6.28	0.003	0.033	21.13
5.6.21	0.003	0.070	20.51
5.6.20	0.007	0.053	18.22
5.6.19	0.003	0.093	20.49
5.6.18	0.037	0.040	20.68
5.6.17	0.017	0.043	20.71
5.6.16	0.010	0.047	20.49
5.6.15	0.007	0.040	18.22
5.6.14	0.010	0.080	18.16
5.6.13	0.003	0.087	18.19
5.6.12	0.013	0.053	21.18
5.6.11	0.027	0.057	21.03
5.6.10	0.003	0.080	21.17
5.6.9	0.007	0.063	20.96
5.6.8	0.010	0.060	20.54
5.5.35	0.020	0.077	20.39
5.5.34	0.003	0.037	17.99
5.5.33	0.007	0.040	20.38
5.5.32	0.053	0.050	20.35
5.5.31	0.030	0.060	20.33
5.5.30	0.007	0.040	17.98
5.5.29	0.013	0.037	17.92
5.5.28	0.010	0.037	20.88
5.5.27	0.013	0.060	20.71
5.5.26	0.007	0.047	20.88
5.5.25	0.010	0.037	20.58
5.5.24	0.020	0.087	20.20

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