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RSA.Cryptography "Incorrect Parameter" thrown C#

I'm trying to set up a messing server for me and my friends and I ran into issues with RSA Decryption.
The correct keys are used
If I enable OAEP padding I get a error that simply states "OAEPpadding"
I'm losing my mind on this bug, I'm posting the script below.
Encryption works fine, its just decryption that's problematic
Please Help
using System;
using System.Net.Sockets;
using System.Net;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using System.Security.Cryptography;
using System.Xml.Serialization;
namespace Server_WIN_
{
class Program
{
public static XmlSerializer xs = new XmlSerializer(typeof(RSAParameters));
public static TcpListener server = new TcpListener(IPAddress.Parse("192.168.1.93"), 78);
public static TcpClient client = null;
public static NetworkStream canwetalk = null;
public static RSACryptoServiceProvider csp = new RSACryptoServiceProvider(4096);
public static RSAParameters publickey;
public static RSAParameters privatekey;
static Program()
{
server.Start();
csp.PersistKeyInCsp = false;
publickey = csp.ExportParameters(false);
privatekey = csp.ExportParameters(true);
client = server.AcceptTcpClient();
canwetalk = client.GetStream();
}
public static void Main(string[] args)
{
string strHostName = "";
strHostName = Dns.GetHostName();
// Then using host name, get the IP address list..
IPHostEntry ipEntry = Dns.GetHostEntry(strHostName);
IPAddress[] addr = ipEntry.AddressList;
Random ran = new Random();
HashAlgorithm sha = SHA256.Create();
string msg = "";
byte[] buffer = new byte[4096];
msg = "test";
msg = Encrypt(msg);
msg = Decrypt(msg);
Console.WriteLine(msg);
}
public static string PublicKeyString()
{
byte[] bytes = new byte[4096];
var sw = new StringWriter();
var xs = new XmlSerializer(typeof(RSAParameters));
xs.Serialize(sw, publickey);
return sw.ToString();
}
public static string PrivateKeyString()
{
byte[] bytes = new byte[4096];
var sw = new StringWriter();
var xs = new XmlSerializer(typeof(RSAParameters));
xs.Serialize(sw, privatekey);
return sw.ToString();
}
public static string Encrypt(string msg)
{
csp.ImportParameters(publickey);
byte[] data = System.Text.Encoding.ASCII.GetBytes(msg);
byte[] cipher = csp.Encrypt(data, false);
return System.Text.Encoding.ASCII.GetString(cipher);
}
public static string Decrypt(string msg)
{
try
{
csp.ImportParameters(privatekey);
byte[] decrypted = csp.Decrypt(System.Text.Encoding.ASCII.GetBytes(msg), false);
return System.Text.Encoding.Unicode.GetString(decrypted);
}
catch(CryptographicException e)
{
string p = e.ToString();
Console.WriteLine(p);
}
return "";
}
public static void ExportPublicKey()
{
string msg = PublicKeyString();
byte[] buffer = new byte[4096];
byte[] msg1 = System.Text.Encoding.ASCII.GetBytes(msg);
canwetalk.Write(msg1, 0, msg1.Length);
}
public static void ToStream(string msg, bool Encryption)
{
if (Encryption)
{
msg = Encrypt(msg);
byte[] msgbytes = System.Text.Encoding.ASCII.GetBytes(msg);
canwetalk.Write(msgbytes, 0, msgbytes.Length);
}
else
{
byte[] msgbytes = System.Text.Encoding.ASCII.GetBytes(msg);
canwetalk.Write(msgbytes, 0, msgbytes.Length);
}
}
public static string ReadStream()
{
byte[] buffer = new byte[4096];
int i = canwetalk.Read(buffer,0,buffer.Length);
return System.Text.Encoding.ASCII.GetString(buffer,0,i);
}
}

You can find this stackoverflow question helpful, but it's quite out of date Error occurred while decoding OAEP padding

Don't use the same provider. Do this instead:
var publicKey = RSA.Create();
publicKey.ImportParameters(PUB_PARAMS);
var privateKey = RSA.Create();
privateKey.ImportParameters(PRIV_PARAMS);

How to use aes_encrypt in C# Windows Form Application

I have been mainly writing in PHP and only know one way to create an aes encryption for a variable:
aes_encrypt(variableName, 'SecretSalt')
I need to encrypt a variable in C# and I have tried a similar approach as in PHP but it is not working (I get an error "The name aes does not exist in current context"
Here is my current code in C#:
var username = txtusername.Text;
var password = txtpassword.Text;
var usernameAES = aes_encrypt(username, 'mySalt');
What is the correct way to use AES_ENCRYPT? I am sending the variable to a PHP Web Service
Update:
More C# code:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net.Http;
using System.Net;
using System.IO;
using System.Threading;
private void Login()
{
if (String.IsNullOrEmpty(txtusername.Text))
{
MessageBox.Show("Please insert username");
}
if (String.IsNullOrEmpty(txtpassword.Text))
{
MessageBox.Show("Please insert password");
}
var Token = "TMMZC 77385 R8G2D6";
var username = txtusername.Text;
var password = txtpassword.Text;
var usernameAES = aes_encrypt(username, 'mySalt');
var url = "https://mydomain.co.za/LoginVerification.php?";
var var = "username=" + username + "&password=" + password + "&Token=" + Token Token;
var URL = url + var;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL);
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream dataStream = response.GetResponseStream();
// Open the stream using a StreamReader for easy access.
StreamReader reader = new StreamReader(dataStream);
// Read the content.
var responseFromServer = reader.ReadToEnd();
//MessageBox.Show(responseFromServer);
// Display the content.
if (responseFromServer == "Allow")
{
//Open Form1
Form1 Form = new Form1();
Form.Show();
//CLose Password Form
Password PasswordForm = new Password();
PasswordForm.Close();
}

try this code
using System.Security.Cryptography;
using System.IO;
public string EncryptText(string input, string password)
{
// Get the bytes of the string
byte[] bytesToBeEncrypted = Encoding.UTF8.GetBytes(input);
byte[] passwordBytes = Encoding.UTF8.GetBytes(password);
// Hash the password with SHA256
passwordBytes = SHA256.Create().ComputeHash(passwordBytes);
byte[] bytesEncrypted = AES_Encrypt(bytesToBeEncrypted, passwordBytes);
string result = Convert.ToBase64String(bytesEncrypted);
return result;
}
public byte[] aes_encrypt(byte[] bytesToBeEncrypted, byte[] passwordBytes)
{
byte[] encryptedBytes = null;
// Set your salt here, change it to meet your flavor:
// The salt bytes must be at least 8 bytes.
byte[] saltBytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };
using (MemoryStream ms = new MemoryStream())
{
using (RijndaelManaged AES = new RijndaelManaged())
{
AES.KeySize = 256;
AES.BlockSize = 128;
var key = new Rfc2898DeriveBytes(passwordBytes, saltBytes, 1000);
AES.Key = key.GetBytes(AES.KeySize / 8);
AES.IV = key.GetBytes(AES.BlockSize / 8);
AES.Mode = CipherMode.CBC;
using (var cs = new CryptoStream(ms, AES.CreateEncryptor(), CryptoStreamMode.Write))
{
cs.Write(bytesToBeEncrypted, 0, bytesToBeEncrypted.Length);
cs.Close();
}
encryptedBytes = ms.ToArray();
}
}
return encryptedBytes;
}

Why is this AES code producing the same encrypted output?

While playing with some AES C# wrappers found on SO and msdn (most notable here and here and here) I wrote the following code and I made the mistake of writing the IV to the CryptoStream.
What I noticed is that the output byte array contains the same values when the IV is written to the CryptoStream. If I comment out the line cryptoStream.Write(aes.IV, 0, aes.IV.Length);, it's fine, the output will be different.
My question is why in this case the output is the same? I realize that writing the IV to the CryptoStream is not what I am supposed to do but I find it odd especially given that the IV is different every time the function executes.
TestEncryption.cs:
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
namespace Test
{
public class TestEncryption
{
public static readonly int KeyBitSize = 256;
private static readonly int BlockBitSize = 128;
public static readonly byte[] _salt = new byte[] { 23, 13, 23, 213, 15, 193, 134, 147, 223, 151 };
const int Iterations = 10000;
public static string Encrypt(byte[] inputBytes, string password)
{
using (var aes = new AesManaged
{
KeySize = KeyBitSize,
BlockSize = BlockBitSize,
Mode = CipherMode.CBC,
Padding = PaddingMode.PKCS7,
})
{
var cryptKey = CreateKey(password);
aes.GenerateIV();
Console.WriteLine("IV={0}", string.Join(", ", aes.IV.Select(b => b.ToString())));
using (var encrypter = aes.CreateEncryptor(cryptKey, aes.IV))
using (var output = new MemoryStream())
{
using (var cryptoStream = new CryptoStream(output, encrypter, CryptoStreamMode.Write))
{
cryptoStream.Write(aes.IV, 0, aes.IV.Length);
cryptoStream.Write(inputBytes, 0, inputBytes.Length);
cryptoStream.FlushFinalBlock();
}
Console.WriteLine("Output={0}", string.Join(", ", output.ToArray().Select(b => b.ToString())));
return Convert.ToBase64String(output.ToArray());
}
}
}
public static string Encrypt(string input, string password)
{
return Encrypt(Encoding.UTF8.GetBytes(input), password);
}
public static byte[] CreateKey(string password)
{
using (var rfc2898DeriveBytes = new Rfc2898DeriveBytes(password, _salt, Iterations))
return rfc2898DeriveBytes.GetBytes(32);
}
}
}
Program.cs
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
namespace Test
{
class Program
{
static void Main(string[] args)
{
//Test1();
Test2();
Console.ReadLine();
}
private static void Test2()
{
string text = "some longer text";
string pwd = "test2";
String encrypt1 = TestEncryption.Encrypt(text, pwd);
String encrypt2 = TestEncryption.Encrypt(text, pwd);
Console.WriteLine(encrypt1 == encrypt2);
}
}
}

Length of the data to decrypt is invalid when using AES encryption in ASP.NET C#

Hi guys please help me out with this, I keep getting this error:
Length of the data to decrypt is invalid.
What am I doing wrong?
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Security.Cryptography;
using System.IO;
namespace inChargeAES
{
public class inChargeCrypto : IinChargeAES
{
public inChargeCrypto() {}
public String inChargeEncrypt(String plaintext, byte[] encryptionKey, byte[] initializationVector)
{
if (plaintext == null || plaintext.Length <= 0)
{
throw new ArgumentNullException("plaintext");
}
if(encryptionKey == null || encryptionKey.Length <= 0){
throw new ArgumentNullException("encryptionKey");
}
if(initializationVector == null || initializationVector.Length <= 0){
throw new ArgumentNullException("initializationVector");
}
byte[] encryptedText;
using(RijndaelManaged rjManage = new RijndaelManaged())
{
rjManage.Key = encryptionKey;
rjManage.IV = initializationVector;
rjManage.Mode = CipherMode.CBC;
//rjManage.Padding = PaddingMode.None;
ICryptoTransform iTransformer = rjManage.CreateEncryptor(rjManage.Key, rjManage.IV);
using(MemoryStream memStream = new MemoryStream())
{
using(CryptoStream cEncryptStream = new CryptoStream(memStream, iTransformer, CryptoStreamMode.Write))
{
using(StreamWriter encryptStreamWriter = new StreamWriter(cEncryptStream))
{
encryptStreamWriter.Write(plaintext);
}
encryptedText = memStream.ToArray();
}
}
}
return Convert.ToBase64String(encryptedText);
}
public String inChargeDecrypt(byte[] cipher, byte[] encryptionKey, byte[] initializationVector)
{
if (cipher == null || cipher.Length <= 0){
throw new ArgumentNullException("cipher");
}
if (encryptionKey == null || encryptionKey.Length <= 0){
throw new ArgumentNullException("encryptionKey");
}
if (initializationVector == null || initializationVector.Length <= 0){
throw new ArgumentNullException("initializationVector");
}
String decryptedText = null;
using (RijndaelManaged rijManage = new RijndaelManaged())
{
rijManage.Key = encryptionKey;
rijManage.IV = initializationVector;
rijManage.Mode = CipherMode.CBC;
rijManage.Padding = PaddingMode.None;
ICryptoTransform iTranformation = rijManage.CreateDecryptor(rijManage.Key, rijManage.IV);
using(MemoryStream memStream = new MemoryStream(cipher))
{
using(CryptoStream cDecryptorStream = new CryptoStream(memStream, iTranformation, CryptoStreamMode.Read))
{
using (StreamReader decryptReader = new StreamReader(cDecryptorStream))
{
decryptedText = decryptReader.ReadToEnd(); //Exception Is Thrown
}
//memStream.Read(cipher, 0, cipher.Length);
}
}
}
return decryptedText;
}
}
}

You've already commented out the padding mode on the encrypt function.
When i Comment it out on the decrypt function everything works as expected.
Assuming you haven't made a mistake converting your base64 string back to byte[]

How generate correct oauth_signature for Vimeo api?

I get error invalid oauth_signature:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Net;
using System.Security.Cryptography;
using System.Web;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
var time_stamp = (DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0)).TotalSeconds;
string consumer_key = "MyConsumerKey";
string signature_method = "HMAC-SHA1";
string nonce = RandomString(32);
string signature;
string key = "MyConsumerSecret&";
System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();
//hm.Key = key;
//HMACSHA1.Create().Initialize();
byte[] keyByte = encoding.GetBytes(key);
string baseUrl = String.Format("method=vimeo.people.search&oauth_consumer_key={0}&oauth_signature_method=HMAC-SHA1&oauth_timestamp={1}&oauth_version=1.0", consumer_key, time_stamp);
byte[] baseMessage = encoding.GetBytes(baseUrl);
HMACSHA1 hmacsha1 = new HMACSHA1(keyByte);
byte[] hashmessage = hmacsha1.ComputeHash(baseMessage);
byte[] encode = System.Text.ASCIIEncoding.ASCII.GetBytes(hashmessage.ToString());
signature = System.Convert.ToBase64String(encode);
Console.WriteLine("signature: " + signature);
string url = String.Format("http://vimeo.com/api/rest/v2?method=vimeo.videos.search&query=ssaa&api_key=API_KEY&oauth_consumer_key={0}&oauth_version=1.0&oauth_signature_method={1}&oauth_timestamp={2}&oauth_nonce={3}&oauth_token=478fa9c8bc5834e60a4fae7688aa0c8e&oauth_signature={4}", consumer_key, signature_method, time_stamp, nonce,signature);
HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url);
HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
StreamReader stream = new StreamReader(resp.GetResponseStream());
string html = stream.ReadToEnd();
Console.WriteLine(html);
}
private static string RandomString(int size)
{
StringBuilder builder = new StringBuilder();
Random random = new Random();
char ch;
for (int i = 0; i < size; i++)
{
ch = Convert.ToChar(Convert.ToInt32(Math.Floor(26 * random.NextDouble() + 65)));
builder.Append(ch);
}
return builder.ToString();
}
}
}