gistfile1.m

- (NSString *) MD5Hash {
  const char *cStr = [self UTF8String];
	unsigned char result[CC_MD5_DIGEST_LENGTH];
	
	CC_MD5( cStr, (CC_LONG)strlen(cStr), result );
	
	NSMutableString *hash = [[NSMutableString alloc] initWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
	for (int i = 0; i < 16; i++) {
		[hash appendFormat: @"%02x", result[i]];
	}
	
	return hash;
}