Question

We were sent this formula to encrypt a string written in Java:

String        myInput = "test1234";
MessageDigest      md = MessageDigest.getInstance("SHA");
byte[]            myD = md.digest(myInput.getBytes());
BASE64Encoder    en64 = new BASE64Encoder();
String       myOutput = new String ( 
                            Java.net.URLEncoder.encode( en64.encode(myD)));
// myOutput becomes "F009U%2Bx99bVTGwS3cQdHf%2BJcpCo%3D"

Our attempt at writing this in C# is:

System.Security.Cryptography.SHA1 sha1 = 
    new System.Security.Cryptography.SHA1CryptoServiceProvider();
string myOutput = HttpUtility.UrlEncode( 
                      Convert.ToBase64String( 
                          sha1.ComputeHash( 
                              ASCIIEncoding.Default.GetBytes(myInput))));

However the output is no where near the same. It doesn’t even have percent signs in it. Any chance anyone would know where we are going wrong?

Answer 1

In your C# version, I would suggest trying UTF8Encoding, UnicodeEncoding or UTF32Encoding rather than your current ASCIIEncoding.

Java’s String.getBytes method uses the platform’s default encoding if you don’t specify one (and you don’t). The platform’s default encoding is unlikely to be ASCII.