HTTP Digest authentication in Objective -C using byte array as password

Question

Hi,

i am using asynchronous URL connection to access a resource from server which uses HTTP digest authentication. In my

• (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge

delegate method i have the following code

newCredential=[NSURLCredential credentialWithUser: username password: pass persistence:NSURLCredentialPersistenceNone];

    [[challenge sender] useCredential:newCredential
           forAuthenticationChallenge:challenge];

The default password parameter in NSURLCredential is in NSString format. However, i have a password which is in byte array format. How can i use byte array password in string format. I am having difficulty in which encoding format should i use when converting byte array to NSString format in this particular case.