Php<?php
$ciphers
= openssl_get_cipher_methods();
//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;
});
if (
is_array($ciphers)) {
foreach (
$ciphers as $cipher) {
echo
$cipher.': ';
echo
openssl_cipher_iv_length($cipher);
echo
'<br>n';
}
}
?>

Will be...
AES-xxx-xxx is 16
BF-xxx is 8
CAMELLIA-xxx is 16
CAST5-xxx is 8
IDEA-xxx is 8
SEED-xxx is 16
lower case:
aes-xxx-xxx are mixed between 16 and 12.
id-aes-xxx are mixed between 12 and 8.
The values above are tested with PHP 5.5 - 5.6 on Windows. In PHP 7.x is different than this.
Openssl_cipher_iv_length Php<?php
$ciphers
= openssl_get_cipher_methods();
//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;
});
if (
is_array($ciphers)) {
foreach (
$ciphers as $cipher) {
echo
$cipher.': ';
echo
openssl_cipher_iv_length($cipher);
echo
'<br>n';
}
}
?>

Will be...
AES-xxx-xxx is 16
BF-xxx is 8
CAMELLIA-xxx is 16
CAST5-xxx is 8
IDEA-xxx is 8
SEED-xxx is 16
lower case:
aes-xxx-xxx are mixed between 16 and 12.
id-aes-xxx are mixed between 12 and 8.
The values above are tested with PHP 5.5 - 5.6 on Windows. In PHP 7.x is different than this.
Php

First, you will need to generate a pseudo-random string of bytesthat you will use as a 256 bit encryption key. The requested length will be 32 (since 32 bytes = 256 bits). If you echo out the key, you will notice that your browser chokes. In order to avoid possible corruption when storing the key in a file or database, we will base64encode it. The opensslencrypt PHP function can encrypt a data with a encryption key. On the other hand, the openssldecrypt function can decrypt the encrypted data using a decrypted key. Here in this article, I am going to show you how to encrypt and decrypt a string in PHP with examples. Jul 12, 2020 I thought that it might be caused by a bug in PHP, but I’ve tested on different hosts: PHP 7.0.6 and PHP 5.6. I’ve also tried multiple online PHP parsers like phpfidle.org or 3v4l.org. It seems that opensslrandompseudobytes not always returns a string of a proper length, but I have no idea why.

Openssl Cipher Suite List

@maulvi The nonce value must be match or the same because it is the key. If you had run my test files (test-js.php, test-php.php) without any modification and it work properly then it means it is working, the trouble maybe from key changed. In PHP, Encryption and Decryption of a string is possible using one of the Cryptography Extensions called OpenSSL function for encrypt and decrypt. Opensslencrypt Function: The opensslencrypt function is used to encrypt the data.

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