C# aes encrypt/decrypt

gistfile1.cs

public const int KEY_SIZE = 16;

public byte[] Encrypt (string password, string input)
{
    var sha256CryptoServiceProvider = new SHA256CryptoServiceProvider();
    var hash = sha256CryptoServiceProvider.ComputeHash(Encoding.UTF8.GetBytes(password));
    var key = new byte[KEY_SIZE];
    var iv = new byte[KEY_SIZE];

    Buffer.BlockCopy(hash, 0, key, 0, KEY_SIZE);
    Buffer.BlockCopy(hash, KEY_SIZE, iv, 0, KEY_SIZE);

    using (var cipher = new AesCryptoServiceProvider().CreateEncryptor(key, iv))
    using (var output = new MemoryStream())                
    {                
        using (var cryptoStream = new CryptoStream(output, cipher, CryptoStreamMode.Write))
        {
            var inputBytes = Encoding.UTF8.GetBytes(input);   
            cryptoStream.Write(inputBytes, 0, inputBytes.Length);
        }
        return output.ToArray();
    }
}

public string Decrypt(string password, byte[] encryptedBytes)
{
        
    var sha256CryptoServiceProvider = new SHA256CryptoServiceProvider();
    var hash = sha256CryptoServiceProvider.ComputeHash(Encoding.UTF8.GetBytes(password));
    var key = new byte[KEY_SIZE];
    var iv = new byte[KEY_SIZE];

    Buffer.BlockCopy(hash, 0, key, 0, KEY_SIZE);
    Buffer.BlockCopy(hash, KEY_SIZE, iv, 0, KEY_SIZE);

    using (var cipher = new AesCryptoServiceProvider().CreateDecryptor(key, iv))
    using (var source = new MemoryStream(encryptedBytes))
    using (var output = new MemoryStream())
    {
        using (var cryptoStream = new CryptoStream(source, cipher, CryptoStreamMode.Read))
        {
            cryptoStream.CopyTo(output);                    
        }                
        return Encoding.UTF8.GetString(output.ToArray());
    }
}

Thanks.

Thank you as well!