(PHP 5 >= 5.3.0, PHP 7, PHP 8)
openssl_get_cipher_methods — Obtém métodos de criptografia disponíveis
Obtém uma lista de métodos de criptografia disponíveis.
Um array de métodos de cifra disponíveis. Observe que antes do OpenSSL 1.1.1, os métodos de criptografia eram retornados em letras maiúsculas e minúsculas; a partir do OpenSSL 1.1.1, apenas as variantes em minúsculas são retornadas.
Exemplo #1 Exemplo de openssl_get_cipher_methods()
Mostra a aparência dos métodos de criptografia disponíveis e também quais sinônimos podem estar disponíveis.
<?php
$ciphers = openssl_get_cipher_methods();
$ciphers_and_aliases = openssl_get_cipher_methods(true);
$cipher_aliases = array_diff($ciphers_and_aliases, $ciphers);
// O modo ECB deve ser evitado
$ciphers = array_filter( $ciphers, function($n) { return stripos($n,"ecb")===FALSE; } );
// Pelo menos já em agosto de 2016, Openssl declarou os seguintes como fracos: baseados em RC2, RC4, DES, 3DES e MD5
$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);
?>O exemplo acima produzirá algo semelhante a:
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
)