Encrypted And Decrypted

static byte[] Encrypt(string simpletext, byte[] key, byte[] iv)
{
    byte[] cipheredtext;
    using (Aes rijAlg = Aes.Create())
    {
        rijAlg.KeySize = 256;
        rijAlg.BlockSize = 128;
        rijAlg.FeedbackSize = 128;
        rijAlg.Padding = PaddingMode.Zeros;
        rijAlg.Key = key;
        rijAlg.IV = iv;

        ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);
        //ICryptoTransform encryptor = rijAlg.CreateEncryptor(key, iv);
        using (MemoryStream memoryStream = new MemoryStream())
        {
            using (CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
            {
                using (StreamWriter streamWriter = new StreamWriter(cryptoStream))
                {
                    streamWriter.Write(simpletext);
                }

                cipheredtext = memoryStream.ToArray();
            }
        }
    }
    return cipheredtext;
}
static string Decrypt(byte[] cipheredtext, byte[] key, byte[] iv)
{
    string simpletext = String.Empty;
    using (Aes rijAlg = Aes.Create())
    {
        rijAlg.KeySize = 256;
        rijAlg.BlockSize = 128;
        rijAlg.FeedbackSize = 128;
        rijAlg.Padding = PaddingMode.Zeros;
        rijAlg.Key = key;
        rijAlg.IV = iv;


        ICryptoTransform decryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);
        //ICryptoTransform decryptor = rijAlg.CreateDecryptor(key, iv);
        using (MemoryStream memoryStream = new MemoryStream(cipheredtext))
        {
            using (CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read))
            {
                using (StreamReader streamReader = new StreamReader(cryptoStream))
                {
                    simpletext = streamReader.ReadToEnd();
                }
            }
        }
    }
    return simpletext;
}

Here My Class Encrypt And Decrypt

Encypted Code

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

If I Decrypeted then show output

I?¦????????????????????????????????????""??????".???????????????????????"??"????????"???????????"???????????????????????????"???????????"????????????????????????????????"????????????????????????????????????????????????"??????????????????????u"?????????????"???????????????????????????????????????????????????????????????????????"???????????????????²?"????????????????????????????????????????????????????"????????????∗???????????????????l???????????????"????????????????????????????????????????????????????????????????????????"???????????????????????????????????h???""???????????"?????????????????????????????????????????????"?????????????????????????????????????????????????????????????????
??????????????????????"?"C????????????+???????????"??????????????????????????????"????????????????????????????????????????????????????????????????????????????????????????????????????????????[??????"????????????"???????????????????y???????????"?????????????????????????????????

Please any suggestions how decrypted code. Please

Thanks & Regards,

Rajesh Kumar

Try this

public static byte[] EncryptString(string plainText, byte[] key, byte[] iv)
{
    Aes encryptor = Aes.Create();
    encryptor.Mode = CipherMode.CBC;
    byte[] aesKey = new byte[32];
    Array.Copy(key, 0, aesKey, 0, 32);
    encryptor.Key = aesKey;
    encryptor.IV = iv;

    MemoryStream memoryStream = new MemoryStream();
    ICryptoTransform aesEncryptor = encryptor.CreateEncryptor();
    CryptoStream cryptoStream = new CryptoStream(memoryStream, aesEncryptor, CryptoStreamMode.Write);
    byte[] plainBytes = Encoding.ASCII.GetBytes(plainText);
    cryptoStream.Write(plainBytes, 0, plainBytes.Length);
    cryptoStream.FlushFinalBlock();
    byte[] cipherBytes = memoryStream.ToArray();
    memoryStream.Close();
    cryptoStream.Close();
    return cipherBytes;
}

public static string DecryptString(byte[] cipherBytes, byte[] key, byte[] iv)
{
    Aes encryptor = Aes.Create();
    encryptor.Mode = CipherMode.CBC;
    byte[] aesKey = new byte[32];
    Array.Copy(key, 0, aesKey, 0, 32);
    encryptor.Key = aesKey;
    encryptor.IV = iv;

    MemoryStream memoryStream = new MemoryStream();
    ICryptoTransform aesDecryptor = encryptor.CreateDecryptor();
    CryptoStream cryptoStream = new CryptoStream(memoryStream, aesDecryptor, CryptoStreamMode.Write);
    string plainText = String.Empty;

    try
    {
        cryptoStream.Write(cipherBytes, 0, cipherBytes.Length);
        cryptoStream.FlushFinalBlock();
        byte[] plainBytes = memoryStream.ToArray();
        plainText = Encoding.ASCII.GetString(plainBytes, 0, plainBytes.Length);
    }
    finally
    {
        memoryStream.Close();
        cryptoStream.Close();
    }

    return plainText;
}

2 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vishal Joshi3y ago

Hello Rajesh

Please try below code for encryption and decryption.

public static string DecryptString(string encrString)
{
    byte[] b;
    string decrypted;
    try
    {
        b = Convert.FromBase64String(encrString);
        decrypted = System.Text.ASCIIEncoding.ASCII.GetString(b);
    }
    catch (FormatException fe)
    {
        decrypted = "";
    }
    return decrypted;
}

public static string EnryptString(string strEncrypted)
{
    byte[] b = System.Text.ASCIIEncoding.ASCII.GetBytes(strEncrypted);
    string encrypted = Convert.ToBase64String(b);
    return encrypted;
}

check below article for refrence

https://www.c-sharpcorner.com/blogs/encrypt-and-decrypt-a-string-in-asp-net1

Thanks Vishal

Amit Mohanty3y ago