Estou tentando criptografar e descriptografar com as seguintes funções, no entanto, isso resulta em um erro de preenchimento incorreto.

Se eu definirPaddingMode paraNone retorna alguns caracteres alfa e símbolos aleatórios no log.

Possivelmente estou perdendo alguma coisa ao definir a estrutura correta, que é a seguinte:

Cipher Rijndael (AES)Tamanho do bloco 128 bits (16 bytes)Tecla CBC do modo (encadeamento de blocos de criptografia)Senha de hash MD5IV Igual à chaveCaractere Base64 da codificação de dadosCodificação UTF-8

Qualquer ajuda para corrigir esse erro e qualquer assistência para garantir o cumprimento da estrutura acima serão muito apreciadas! obrigado

Erro

CryptographicException: Bad PKCS7 padding. Invalid length 106.
Mono.Security.Cryptography.SymmetricTransform.ThrowBadPaddingException (PaddingMode padding, Int32 length, Int32 position) (at /Users/builduser/buildslave/monoAndRuntimeClassLibs/build/mcs/class/corlib/Mono.Security.Cryptography/SymmetricTransform.cs:363)
Mono.Security.Cryptography.SymmetricTransform.FinalDecrypt (System.Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount) (at /Users/builduser/buildslave/monoAndRuntimeClassLibs/build/mcs/class/corlib/Mono.Security.Cryptography/SymmetricTransform.cs:515)
Mono.Security.Cryptography.SymmetricTransform.TransformFinalBlock (System.Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount) (at /Users/builduser/buildslave/monoAndRuntimeClassLibs/build/mcs/class/corlib/Mono.Security.Cryptography/SymmetricTransform.cs:554)
System.Security.Cryptography.RijndaelManagedTransform.TransformFinalBlock (System.Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount) (at /Users/builduser/buildslave/monoAndRuntimeClassLibs/build/mcs/class/corlib/System.Security.Cryptography/RijndaelManagedTransform.cs:94)
APIConnector.Decrypt (System.String toDecrypt) (at Assets/APIConnector.cs:85)

Meu código

using UnityEngine;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Security.Cryptography;
using System.Text;
using System.Xml;
using System.IO;

public class APIConnector : MonoBehaviour {

    // Use this for initialization
    void Start () {

        Debug.Log ("Starting API connector");


    }

    // Update is called once per frame
    void Update () {



    }

    static string data;
    string firstName="";
    string password="";

    void OnGUI() {

        firstName = GUILayout.TextField (firstName, GUILayout.Width(300));
        password = GUILayout.TextField (password, GUILayout.Width(300));

        if (GUILayout.Button ("Submit"))
                        submit ();

    }

    //Our functions

    void submit(){

        Debug.Log ("Name is: " + firstName + " encrypted is: " + Encrypt(firstName));
        Debug.Log ("Name is: " + firstName + " decrypted is: " + Decrypt(firstName));

    }


            public static string Encrypt (string toEncrypt)
            {
        byte[] keyArray = UTF8Encoding.UTF8.GetBytes ("SecretPassphrase");
                // 256-AES key
        int numBytes = System.Text.Encoding.UTF8.GetBytes(toEncrypt).Length;
        Debug.Log ("Bytes: " + numBytes);
                byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes (toEncrypt);
                RijndaelManaged rDel = new RijndaelManaged ();
                rDel.Key = keyArray;
                rDel.BlockSize = 128;
                rDel.Mode = CipherMode.CBC;
                // http://msdn.microsoft.com/en-us/library/system.security.cryptography.ciphermode.aspx
                rDel.Padding = PaddingMode.PKCS7;
                // better lang support
                ICryptoTransform cTransform = rDel.CreateEncryptor ();
                byte[] resultArray = cTransform.TransformFinalBlock (toEncryptArray, 0, toEncryptArray.Length);
                return Convert.ToBase64String (resultArray, 0, resultArray.Length);
            }

            public static string Decrypt (string toDecrypt)
            {
        byte[] keyArray = UTF8Encoding.UTF8.GetBytes ("SecretPassphrase");
                // AES-256 key
        byte[] encryptedData = System.Convert.FromBase64String(toDecrypt);
                //byte[] toEncryptArray = Convert.FromBase64String (toDecrypt);
                RijndaelManaged rDel = new RijndaelManaged ();
                rDel.Key = keyArray;
                rDel.BlockSize = 128;
                rDel.Mode = CipherMode.CBC;
                rDel.IV = rDel.Key;
                // http://msdn.microsoft.com/en-us/library/system.security.cryptography.ciphermode.aspx
                rDel.Padding = PaddingMode.PKCS7;
                // better lang support
                ICryptoTransform cTransform = rDel.CreateDecryptor ();
        byte[] resultArray = cTransform.TransformFinalBlock (encryptedData, 0, encryptedData.Length);
                return UTF8Encoding.UTF8.GetString (resultArray);
            }


}