NSData to display as a string

Use the NSString initWithData:encoding: method.

NSString *someString = [[NSString alloc] initWithData:hashedData encoding:NSASCIIStringEncoding];

(edit to respond to your comment:)

In that case, Joshua’s answer does help:

NSCharacterSet *charsToRemove = [NSCharacterSet characterSetWithCharactersInString:@"< >"];
NSString *someString = [[hashedData description] stringByTrimmingCharactersInSet:charsToRemove];