asp.net, encode and decode

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Hello,

Encode:

C#

public static string Base64EncodingMethod(string sData)
   {
       byte[] encodingDataASBytes = System.Text.Encoding.Unicode.GetBytes(sData);
       string sReturnValues = System.Convert.ToBase64String(encodingDataASBytes);
       return sReturnValues;
   }

Decode:

C#

public static string Base64DecodingMethod(string sData)
    {
        byte[] encData = System.Convert.ToBase64String(sData);
        string result = System.Text.ASCIIEncoding.ASCII.GetString(encData);
        return result;
    }

This is my code for encode and decode.
But at decoding time one error is occured.

Error: Invalid character in a Base-64 string.

Thanks,

Posted 15-Jul-12 19:24pm

Pratham4950

Updated 15-Jul-12 20:20pm

Sandeep Mewara

v2

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Nilesh Patil Kolhapur · Answer 1 · 2012-07-16T00:09:00

Hi,

try this for encoding and decoding

C#

public static string GetEncryptedPassword(string password)
    {
        string newPass = string.Empty;
        int num = new Random().Next(1, 10);
        foreach (char ch in password)
        {
            newPass += (char)(ch + num);
        }
        newPass += (char)num;
        return newPass;
    }

C#

public static string GetDecryptedPassword(string password)
   {
       string decryptedPassword = string.Empty;
       int num = (int)password[password.Length - 1];
       password = password.Remove(password.Length - 1, 1);
       foreach (char ch in password)
       {
           decryptedPassword += (char)(ch - num);
       }
       return decryptedPassword;
   }

Best Luck
Happy Coding:)

Sandeep Mewara · Answer 2 · 2012-07-15T20:24:00

While Decoding, try:

C#

string returnValue = System.Text.Encoding.UTF8.GetString(encodedDataAsBytes);

to get back the result instead of ASCII encoding.

Thus, overall:

C#

// Encode:
public static string EncodeTo64UTF8(string m_enc)
{
    byte[] toEncodeAsBytes = System.Text.Encoding.UTF8.GetBytes(m_enc);
    string returnValue = System.Convert.ToBase64String(toEncodeAsBytes);
    return returnValue;
}

// Decode:
public static string DecodeFrom64(string m_enc)
{
    byte[] encodedDataAsBytes = System.Convert.FromBase64String(m_enc);
    string returnValue = System.Text.Encoding.UTF8.GetString(encodedDataAsBytes);
    return returnValue;
}

StianSandberg · Answer 3 · 2012-07-15T20:26:00

Solution 2

I think your decode function is wrong.. Should do FromBase64String

C#

public static string Base64DecodingMethod(string encodedData)
{
    byte[] data = System.Convert.FromBase64String(encodedData);
    return System.Text.Encoding.Unicode.GetString(data);
}

My suggestion:

C#

public class Base64
{
    public static string Encode(string value, Encoding enc = null)
    {
        if (enc == null)
            enc = Encoding.UTF8; // Use UTF8 as default
        return Convert.ToBase64String(enc.GetBytes(value));
    }

    public static string Decode(string data, Encoding enc = null)
    {
        if (enc == null)
            enc = Encoding.UTF8; // Use UTF8 as default
        return enc.GetString(Convert.FromBase64String(data));
    }
}

Posted 15-Jul-12 20:26pm

StianSandberg

Updated 15-Jul-12 23:49pm

v3

Comments

Pratham4950 16-Jul-12 5:14am

I am using your code but one error is occurred.
Error: "Invalid character in a Base-64 string"

StianSandberg 16-Jul-12 5:44am

I tried this:

class Program
{
static void Main(string[] args)
{
var stringToEncode = "Hello world. This string will be encoded and decoded";
Console.WriteLine(stringToEncode);
var encodedString = Base64.Encode(stringToEncode);
Console.WriteLine(encodedString);
var decodedString = Base64.Decode(encodedString);
Console.WriteLine(decodedString);

Console.Read();
}

public class Base64
{
public static string Encode(string value) { return Convert.ToBase64String(Encoding.UTF8.GetBytes(value)); }
public static string Decode(string data) { return Encoding.UTF8.GetString(Convert.FromBase64String(data)); }
}
}

Result:
Hello world. This string will be encoded and decoded
SGVsbG8gd29ybGQuIFRoaXMgc3RyaW5nIHdpbGwgYmUgZW5jb2RlZCBhbmQgZGVjb2RlZA==
Hello world. This string will be encoded and decoded

this works..
What are you trying to encode/decode? Are you sending this base64 encoded text in a querystring or something? Looks like you are changing the encoded value before you try to decode it.

Rajesh Buddaraju · Answer 4 · 2012-07-15T20:47:00

For me your code looks too complex, You can do it in a easy manner.
Plz try below,

C#

public static string Encode(string data) { return Convert.ToBase64String(Encoding.UTF8.GetBytes(data)); }
    public static string Decode(string data) { return Encoding.UTF8.GetString(Convert.FromBase64String(data)); }

:)

asp.net, encode and decode

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