Convert encrypt and decrypt C# function to PHP function

Question

I would like to convert C# function to PHP function. Here is link to Function in C# : https://stackoverflow.com/a/19441805/3581428

public static string Encrypt(string clearText)
{
    string EncryptionKey = "MAKV2SPBNI99212";
    byte[] clearBytes = Encoding.Unicode.GetBytes(clearText);
    using (Aes encryptor = Aes.Create())
    {
        Rfc2898DeriveBytes pdb = new 
            Rfc2898DeriveBytes(EncryptionKey, new byte[] 
            { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
        encryptor.Key = pdb.GetBytes(32);
        encryptor.IV = pdb.GetBytes(16);
        using (MemoryStream ms = new MemoryStream())
        {
            using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateEncryptor(), CryptoStreamMode.Write))
            {
                cs.Write(clearBytes, 0, clearBytes.Length);
                cs.Close();
            }
            clearText = Convert.ToBase64String(ms.ToArray());
        }
    }
    return clearText;
}

public static string Decrypt(string cipherText)
{
    string EncryptionKey = "MAKV2SPBNI99212";
    byte[] cipherBytes = Convert.FromBase64String(cipherText);
    using (Aes encryptor = Aes.Create())
    {
        Rfc2898DeriveBytes pdb = new 
            Rfc2898DeriveBytes(EncryptionKey, new byte[] 
            { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
        encryptor.Key = pdb.GetBytes(32);
        encryptor.IV = pdb.GetBytes(16);
        using (MemoryStream ms = new MemoryStream())
        {
            using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateDecryptor(), CryptoStreamMode.Write))
            {
                cs.Write(cipherBytes, 0, cipherBytes.Length);
                cs.Close();
            }
            cipherText = Encoding.Unicode.GetString(ms.ToArray());
        }
    }
    return cipherText;
}

I have tried in function below but It created different Encrypted string:

function encrypt_decrypt($action, $string) {
    $output = false;

$encrypt_method = "AES-256-CBC";
$secret_key = '3sc3RLrpd17';

$secret_iv=chr(0x49).chr(0x76).chr(0x61).chr(0x6e).chr(0x20).chr(0x4d).chr(0x65).chr(0x64).chr(0x76).chr(0x65).chr(0x64).chr(0x65).chr(0x76);


$key = substr(hash('sha1', $secret_key), 0, 32);;
//echo "key: ".$key."
";

$iv = substr(hash('sha1', $secret_iv), 0, 16);
//echo "iv key: ".$iv."
";
if( $action == 'encrypt' ) {
    $output = openssl_encrypt($string, $encrypt_method, $key, 0, $iv);
    $output = base64_encode($output);
}
else if( $action == 'decrypt' ){
    $output = openssl_decrypt(base64_decode($string), $encrypt_method, $key, 0, $iv);
}

return $output;
}

$plain_txt = "1122334411223344";
echo "Plain Text = $plain_txt
"."
";

$encrypted_txt = encrypt_decrypt('encrypt', $plain_txt);
echo "Encrypted Text = $encrypted_txt
"."
";

$decrypted_txt = encrypt_decrypt('decrypt', $encrypted_txt);
echo "Decrypted Text = $decrypted_txt
"."
";

if( $plain_txt === $decrypted_txt ) echo "SUCCESS"."
";
else echo "FAILED"."
";

echo "
"."
";
exit;

Encrypted String using C# method :

thkTvpUmSWV9lKAOfWNIIu9n7jHcku7C6WDD/hsvll+xjqOWdk3fyI+eRhBbvJlX

Length is 64

Encrypted String Using PHP method :

OTlIYXJDcTl0SVpKRlhaV0l3dFk1ZjFYM3FPcHB3ckdTRERITGhHVEVoTT0=

Length is 60

How can I generate same Encrypted string as C# function ? How can I replicate C# function for PHP?

Able to Create Encrypted Text Length of 64 using this example Link : AES ENCRYPTION 64 length encrypted string

user_1889825 · Answer

As @odan given , minor changes for those how needed PHP, openssl_encrypt with AES-128-CBC , key and IV, below PHP code

$plaintext = 'My secret message 1234';
$key = '3d756227f8be6f85';
// CBC has an IV and thus needs randomness every time a message is encrypted
$method = 'AES-128-CBC';
$iv = 'ba7e0bb79b61f82d';

$cipher  =   openssl_encrypt($plaintext, $method, $key, $options=OPENSSL_RAW_DATA,$iv );
$body=       base64_encode($cipher);
echo $body;
$decrypted = openssl_decrypt($cipher, $method, $key, OPENSSL_RAW_DATA, $iv);
echo ' decrypted to: ' . $decrypted . "

";

and C# code link in fiddle also : https://dotnetfiddle.net/LE8lTx

using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;

public class Program
{
    public static void Main()
    {
        string message = "My secret message 1234";
        string password = "3d756227f8be6f85";
        string ivstr = "ba7e0bb79b61f82d";  
        
        Program p=new Program();

        string encrypted = p.EncryptString(message, password, ivstr);
        string decrypted = p.DecryptString(encrypted, password, ivstr);
                

        Console.WriteLine(encrypted);
        Console.WriteLine(decrypted);
        
    }
    
    public  string EncryptString(string plainText, string password,string ivstr)
    {
         byte[] key = Encoding.UTF8.GetBytes(password);
         byte[] iv = Encoding.UTF8.GetBytes(ivstr);
        // Instantiate a new Aes object to perform string symmetric encryption
        Aes encryptor = Aes.Create();

        encryptor.Mode = CipherMode.CBC;

        // Set key and IV
        byte[] aesKey = new byte[16];
        Array.Copy(key, 0, aesKey, 0, 16);
        encryptor.Key = aesKey;
        encryptor.IV = iv;

        // Instantiate a new MemoryStream object to contain the encrypted bytes
        MemoryStream memoryStream = new MemoryStream();

        // Instantiate a new encryptor from our Aes object
        ICryptoTransform aesEncryptor = encryptor.CreateEncryptor();

        // Instantiate a new CryptoStream object to process the data and write it to the 
        // memory stream
        CryptoStream cryptoStream = new CryptoStream(memoryStream, aesEncryptor, CryptoStreamMode.Write);

        // Convert the plainText string into a byte array
        byte[] plainBytes = Encoding.ASCII.GetBytes(plainText);

        // Encrypt the input plaintext string
        cryptoStream.Write(plainBytes, 0, plainBytes.Length);

        // Complete the encryption process
        cryptoStream.FlushFinalBlock();

        // Convert the encrypted data from a MemoryStream to a byte array
        byte[] cipherBytes = memoryStream.ToArray();

        // Close both the MemoryStream and the CryptoStream
        memoryStream.Close();
        cryptoStream.Close();

        // Convert the encrypted byte array to a base64 encoded string
        string cipherText = Convert.ToBase64String(cipherBytes, 0, cipherBytes.Length);

        // Return the encrypted data as a string
        return cipherText;
    }

    public  string DecryptString(string cipherText,  string password,string ivstr)
    {
         byte[] key = Encoding.UTF8.GetBytes(password);
         byte[] iv = Encoding.UTF8.GetBytes(ivstr);
        
        // Instantiate a new Aes object to perform string symmetric encryption
        Aes encryptor = Aes.Create();

        encryptor.Mode = CipherMode.CBC;

        // Set key and IV
        byte[] aesKey = new byte[16];
        Array.Copy(key, 0, aesKey, 0, 16);
        encryptor.Key = aesKey;
        encryptor.IV = iv;

        // Instantiate a new MemoryStream object to contain the encrypted bytes
        MemoryStream memoryStream = new MemoryStream();

        // Instantiate a new encryptor from our Aes object
        ICryptoTransform aesDecryptor = encryptor.CreateDecryptor();

        // Instantiate a new CryptoStream object to process the data and write it to the 
        // memory stream
        CryptoStream cryptoStream = new CryptoStream(memoryStream, aesDecryptor, CryptoStreamMode.Write);

        // Will contain decrypted plaintext
        string plainText = String.Empty;

        try
        {
            // Convert the ciphertext string into a byte array
            byte[] cipherBytes = Convert.FromBase64String(cipherText);

            // Decrypt the input ciphertext string
            cryptoStream.Write(cipherBytes, 0, cipherBytes.Length);

            // Complete the decryption process
            cryptoStream.FlushFinalBlock();

            // Convert the decrypted data from a MemoryStream to a byte array
            byte[] plainBytes = memoryStream.ToArray();

            // Convert the decrypted byte array to string
            plainText = Encoding.ASCII.GetString(plainBytes, 0, plainBytes.Length);
        }
        finally
        {
            // Close both the MemoryStream and the CryptoStream
            memoryStream.Close();
            cryptoStream.Close();
        }

        // Return the decrypted data as a string
        return plainText;
    }
}

Convert encrypt and decrypt C# function to PHP function

2 Answers