How to encrypt a string with a key using symmetric key encryption in C#?

Question

0.00/5 (No votes)

See more:

I want to encrypt a string with a key. i have tried this code. I got this error. Please help me.
Any Symmetric Key Algorithm.

C#

Error	1	'string' does not contain a definition for 'CreateEncryptor' and no extension method 'CreateEncryptor' accepting a first argument of type 'string' could be found (are you missing a using directive or an assembly reference?)	G:\2nd Sem\Web Services\My WebService Projects in .NET\RecordProtocol\RecordProtocol\Form1.cs	68	64	RecordProtocol

What I have tried:

private void button4_Click(object sender, EventArgs e)//Encrypt
{
            string PlainText = textBox6.Text;
            string key = textBox10.Text;
            textBox7.Text = Encrypt(PlainText,key);
}
public static string Encrypt(string PlainText, string key)
{
            MemoryStream ms = new MemoryStream();
            CryptoStream crypstream = new CryptoStream(ms, key.CreateEncryptor(), CryptoStreamMode.Write);
            StreamWriter sw = new StreamWriter(crypstream);
            sw.WriteLine(PlainText);
            sw.Close();
            crypstream.Close();
            byte[] buffer = ms.ToArray();
            ms.Close();
            string output;
            output = Encoding.ASCII.GetString(buffer);
            return output;           
}

Posted 26-Apr-16 20:12pm

dipankarnalui

Updated 26-Apr-16 20:28pm

v2

Add a Solution

2 solutions

Solution 2

As the error says, CreateEncryptor is not a string function - it's a method which is called on the selected encryption algorithm. For example: SymmetricAlgorithm.CreateEncryptor Method (System.Security.Cryptography)[^] or
SymmetricAlgorithm.CreateEncryptor Method (Byte[], Byte[]) (System.Security.Cryptography)[^]
If you want encryption to work reliably - and unreliable encryption is no use to anyone - I'd suggest you start reading up on symmetric encryption: Encrypting Data[^]
The link includes working examples.

Posted 26-Apr-16 20:28pm

OriginalGriff

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

yaswanth kumar kapa · Accepted Answer · 2016-04-26T20:21:00

C#

public string Md5AddSecret(string pass)
    {
        string hashKey = "kuiygHJG564qwertynbv";
        string terminalId = "99999999";
        string reference = "0000008765";

        string x = Convert.ToBase64String(
            new SHA1CryptoServiceProvider().ComputeHash(Encoding.UTF8.GetBytes(
                string.Concat(hashKey, terminalId, reference, pass))));

        return x;
    }