openssl_get_cipher_methods
(PHP 5 >= 5.3.0, PHP 7, PHP 8)
openssl_get_cipher_methods — Gets available cipher methods
Description
$aliases
= false
): arrayGets a list of available cipher methods.
Parameters
-
aliases
-
Set to
true
if cipher aliases should be included within the returned array.
Return Values
An array of available cipher methods. Note that prior to OpenSSL 1.1.1, the cipher methods have been returned in upper case and lower case spelling; as of OpenSSL 1.1.1 only the lower case variants are returned.
Examples
Example #1 openssl_get_cipher_methods() example
Shows how the available ciphers might look, and also which aliases might be available.
<?php
$ciphers = openssl_get_cipher_methods();
$ciphers_and_aliases = openssl_get_cipher_methods(true);
$cipher_aliases = array_diff($ciphers_and_aliases, $ciphers);
//ECB mode should be avoided
$ciphers = array_filter( $ciphers, function($n) { return stripos($n,"ecb")===FALSE; } );
//At least as early as Aug 2016, Openssl declared the following weak: RC2, RC4, DES, 3DES, MD5 based
$ciphers = array_filter( $ciphers, function($c) { return stripos($c,"des")===FALSE; } );
$ciphers = array_filter( $ciphers, function($c) { return stripos($c,"rc2")===FALSE; } );
$ciphers = array_filter( $ciphers, function($c) { return stripos($c,"rc4")===FALSE; } );
$ciphers = array_filter( $ciphers, function($c) { return stripos($c,"md5")===FALSE; } );
$cipher_aliases = array_filter($cipher_aliases,function($c) { return stripos($c,"des")===FALSE; } );
$cipher_aliases = array_filter($cipher_aliases,function($c) { return stripos($c,"rc2")===FALSE; } );
print_r($ciphers);
print_r($cipher_aliases);
?>
The above example will output something similar to:
Array ( [0] => aes-128-cbc [1] => aes-128-cbc-hmac-sha1 [2] => aes-128-cbc-hmac-sha256 [3] => aes-128-ccm [4] => aes-128-cfb [5] => aes-128-cfb1 [6] => aes-128-cfb8 [7] => aes-128-ctr [9] => aes-128-gcm [10] => aes-128-ocb [11] => aes-128-ofb [12] => aes-128-xts [13] => aes-192-cbc [14] => aes-192-ccm [15] => aes-192-cfb [16] => aes-192-cfb1 [17] => aes-192-cfb8 [18] => aes-192-ctr [20] => aes-192-gcm [21] => aes-192-ocb [22] => aes-192-ofb [23] => aes-256-cbc [24] => aes-256-cbc-hmac-sha1 [25] => aes-256-cbc-hmac-sha256 [26] => aes-256-ccm [27] => aes-256-cfb [28] => aes-256-cfb1 [29] => aes-256-cfb8 [30] => aes-256-ctr [32] => aes-256-gcm [33] => aes-256-ocb [34] => aes-256-ofb [35] => aes-256-xts [36] => aria-128-cbc [37] => aria-128-ccm [38] => aria-128-cfb [39] => aria-128-cfb1 [40] => aria-128-cfb8 [41] => aria-128-ctr [43] => aria-128-gcm [44] => aria-128-ofb [45] => aria-192-cbc [46] => aria-192-ccm [47] => aria-192-cfb [48] => aria-192-cfb1 [49] => aria-192-cfb8 [50] => aria-192-ctr [52] => aria-192-gcm [53] => aria-192-ofb [54] => aria-256-cbc [55] => aria-256-ccm [56] => aria-256-cfb [57] => aria-256-cfb1 [58] => aria-256-cfb8 [59] => aria-256-ctr [61] => aria-256-gcm [62] => aria-256-ofb [63] => bf-cbc [64] => bf-cfb [66] => bf-ofb [67] => camellia-128-cbc [68] => camellia-128-cfb [69] => camellia-128-cfb1 [70] => camellia-128-cfb8 [71] => camellia-128-ctr [73] => camellia-128-ofb [74] => camellia-192-cbc [75] => camellia-192-cfb [76] => camellia-192-cfb1 [77] => camellia-192-cfb8 [78] => camellia-192-ctr [80] => camellia-192-ofb [81] => camellia-256-cbc [82] => camellia-256-cfb [83] => camellia-256-cfb1 [84] => camellia-256-cfb8 [85] => camellia-256-ctr [87] => camellia-256-ofb [88] => cast5-cbc [89] => cast5-cfb [91] => cast5-ofb [92] => chacha20 [93] => chacha20-poly1305 [111] => id-aes128-CCM [112] => id-aes128-GCM [113] => id-aes128-wrap [114] => id-aes128-wrap-pad [115] => id-aes192-CCM [116] => id-aes192-GCM [117] => id-aes192-wrap [118] => id-aes192-wrap-pad [119] => id-aes256-CCM [120] => id-aes256-GCM [121] => id-aes256-wrap [122] => id-aes256-wrap-pad [124] => idea-cbc [125] => idea-cfb [127] => idea-ofb [137] => seed-cbc [138] => seed-cfb [140] => seed-ofb [141] => sm4-cbc [142] => sm4-cfb [143] => sm4-ctr [145] => sm4-ofb ) Array ( [36] => aes128 [37] => aes128-wrap [38] => aes192 [39] => aes192-wrap [40] => aes256 [41] => aes256-wrap [69] => aria128 [70] => aria192 [71] => aria256 [72] => bf [77] => blowfish [99] => camellia128 [100] => camellia192 [101] => camellia256 [102] => cast [103] => cast-cbc [146] => idea [164] => seed [169] => sm4 )