Encryption and decryption without special character

Question

2.09/5 (3 votes)

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Hi guys..
I want to encrypt mail id. The encrypted mail id should not contain special characters.
I have used this:

C#

string EncryptedEmailId;
                            string EncryptionKey = "MAKV2SPBNI99212";
                            byte[] EmailIdEncrypt = Encoding.Unicode.GetBytes(InvEmail);

                            using (Aes encryptor = Aes.Create())
                            {
                                Rfc2898DeriveBytes pdbEncrypt = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
                                encryptor.Key = pdbEncrypt.GetBytes(32);
                                encryptor.IV = pdbEncrypt.GetBytes(16);
                                using (MemoryStream msEncrypt = new MemoryStream())
                                {
                                    using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor.CreateEncryptor(), CryptoStreamMode.Write))
                                    {
                                        csEncrypt.Write(EmailIdEncrypt, 0, EmailIdEncrypt.Length);
                                        csEncrypt.Close();
                                    }
                                    EncryptedEmailId = Convert.ToBase64String(msEncrypt.ToArray());
                                }
                            }
                            individualContent = individualContent.Replace("[MailId]", EncryptedEmailId);

This is producing mail id with special characters.

Please help me.

Posted 21-Apr-14 2:53am

Ami_Modi

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2 solutions

Solution 1

Encryption always produces "special characters" because it converts the input (from text or whatever it was) to a collection of bytes - which aren't characters, they are eight bit values which may contain valid characters but are more likely not to.

Try converting the byte array to Base64[^] - that will contain only "readable" characters.

Posted 21-Apr-14 3:04am

OriginalGriff

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Ami_Modi · Accepted Answer · 2014-04-23T19:40:00

I got my ans from here:http://www.nullskull.com/faq/834/convert-string-to-hex-and-hex-to-string-in-net.aspx[^]

a) Convert String to Hex

C#

public static string ConvertStringToHex(String input, System.Text.Encoding encoding)
    {
         Byte[] stringBytes = encoding.GetBytes(input);
        StringBuilder sbBytes = new StringBuilder(stringBytes.Length * 2);
        foreach (byte b in stringBytes)
         {
             sbBytes.AppendFormat("{0:X2}", b);
        }
        return sbBytes.ToString();
    }

b) Convert Hex to String

C#

public static string ConvertHexToString(String hexInput, System.Text.Encoding encoding)
    {
         int numberChars = hexInput.Length;
        byte[] bytes = new byte[numberChars / 2];
         for (int i = 0; i < numberChars; i += 2)
        {
            bytes[i / 2] = Convert.ToByte(hexInput.Substring(i, 2), 16);
         }
         return encoding.GetString(bytes);
    }

Sample usage code

C#

string testString = "MIKA@?&^";
    string hex = ConvertStringToHex(testString, System.Text.Encoding.Unicode);
    string normal = ConvertHexToString(hex, System.Text.Encoding.Unicode);
    Debug.Assert(testString.CompareTo(normal) == 0, "They are not identical");