convert byte[] to hex value

gunjan.sh · January 23rd, 2008, 09:43 AM

Hi,
I have a function to encrypt the password which returns a byte[].
When saving to a text file it does not return the hex value but displays System.Byte[].After encrypting the password, i need the value in the file to be displayed as 0x0100CE6EE7655EC6B23C78209BADE0556A6F457E0B7CAA4B 67.

Following is the function used to Encrypt the password.

public static byte[] EncryptPwd(string password)
        {
            MD5CryptoServiceProvider md5Hasher = new MD5CryptoServiceProvider();
            UTF8Encoding encoder = new UTF8Encoding();
            try
            {
                return (md5Hasher.ComputeHash(encoder.GetBytes(password)) );
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

Gunjan

samjudson · January 23rd, 2008, 10:08 AM

0x0100CE6EE7655EC6B23C78209BADE0556A6F457E0B7CAA4B 67 reads like one (very large) number, so if it has to be this exact format you'll probably have to do it yourself. The key is probably the ToString("X") method of the byte.

Something like this:

Code:

System.Text.StringBuilder sb = new System.Text.StringBuilder();
sb.Append("0x");
foreach (byte b in bytes)
{
  sb.AppendFormat("{0:X2}", b);
}
Console.WriteLine(sb.ToString());

/- Sam Judson : Wrox Technical Editor -/

samjudson · January 23rd, 2008, 11:30 AM

Actually on second thoughts you might be after this:

BitConverter.ToString(hashedBytes);

/- Sam Judson : Wrox Technical Editor -/

gunjan.sh · January 24th, 2008, 02:38 AM

But using string.Format("{0:X2}",b) or BitConverter i get different values for the same data ....
Why is it ??

Gunjan

samjudson · January 24th, 2008, 05:15 AM

BitConverter does insert hyphens in it, but other than that should return the same hexadecimal values. If not then please show us your example code.

/- Sam Judson : Wrox Technical Editor -/