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/** location of the password file on disk */ private static String dPwdFile; /** chooses a salt for the user, computes the salted hash of the user's password, and adds a new entry into the userMap hashtable for the user. */ public static void add(String username, String password) throws Exception { int salt = chooseNewSalt(); HashedPasswordTuple ur = new HashedPasswordTuple(getSaltedHash(password, salt), salt); dUserMap.put(username,ur); } /** computes a new, random 12-bit salt */ public static int chooseNewSalt() throws NoSuchAlgorithmException { return getSecureRandom((int)Math.pow(2,12)); } /** returns a cryptographically random number in the range [0,max) */ private static int getSecureRandom(int max) throws NoSuchAlgorithmException { SecureRandom sr = SecureRandom.getInstance("SHA1PRNG"); return Math.abs(sr.nextInt()); } /** returns a salted, SHA hash of the password */ public static String getSaltedHash(String pwd, int salt) throws Exception { return computeSHA(pwd + "|" + salt); } /** returns the SHA-256 hash of the provided preimage as a String */ private static String computeSHA(String preimage) throws Exception { MessageDigest md = null; md = MessageDigest.getInstance("SHA-256"); md.update(preimage.getBytes("UTF-8")); byte raw[] = md.digest(); return (new sun.misc.BASE64Encoder().encode(raw)); } /** returns true if the username and password combo is in the database */ public static boolean checkPassword(String username, String password) { try { HashedPasswordTuple t = (HashedPasswordTuple)dUserMap.get(username); return (t == null) false : t.getHashedPassword().equals(getSaltedHash(password, t.getSalt())); } catch (Exception e) {

string[] result = AddNumbers(new string[] { "The Jazz Devil", "Jitterbugs" });

This inline array technique can occasionally be useful if you need to call a method that demands to be passed an array, and you happen not to have one handy. The String class s Split method illustrates an interesting twist on this.

You can obtain a contiguous range of characters within a string by using the Substring method. There are a couple of overloads of this method, and Example 10-52 shows them in action.

string myString = "This is the silliest stuff that ere I heard."; string subString = myString.Substring(5); string anotherSubString = myString.Substring(12, 8); Console.WriteLine(subString); Console.WriteLine(anotherSubString);

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Notice that both of these overloads return a new string, containing the relevant portion of the original string. The first overload starts with the character at the specified index, and returns the rest of the string (regardless of how long it might be). The second starts at the specified index, and returns as many characters as are requested. A very common requirement is to get the last few characters from a string. Many platforms have this as a built-in function, or feature of their strings, but the .NET Framework leaves you to do it yourself. To do so depends on us knowing how many characters there are in the string, subtracting the offset from the end, and using that as our starting index, as Example 10-53 shows.

} return false; } /** Password file management operations follow **/ public static void init(String pwdFile) throws Exception { dUserMap = HashedSaltedPasswordFile.load(pwdFile); dPwdFile = pwdFile; } /** forces a write of the password file to disk */ public static void flush() throws Exception { HashedSaltedPasswordFile.store (dPwdFile, dUserMap); } /** adds a new username/password combination to the database, or replaces an existing one. */ public static void main(String argv[]) { String pwdFile = null; String userName = null; try { pwdFile = argv[0]; userName = argv[1]; init(pwdFile); System.out.print("Enter new password for " + userName + ": "); BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); String password = br.readLine(); add(userName, password); flush(); } catch (Exception e) { if ((pwdFile != null) && (userName != null)) { System.err.println("Error: Could not read or write " + pwdFile); } else { System.err.println("Usage: java " + "com.learnsecurity.MiniPasswordManager" + " <pwdfile> <username>"); } } } } /** This class is a simple container that stores a salt, and a salted, hashed password */ class HashedPasswordTuple { private String dHpwd; private int dSalt;

static string Right(string s, int length) { int startIndex = s.Length - length; return s.Substring(startIndex); }

Notice how we re using the Length property on the string to determine the total number of characters in the string, and then returning the substring from that offset (to the end). We could then use this method to take the last six characters of our string, as Example 10-54 does.

string myString = "This is the silliest stuff that ere I heard."; string subString = Right(myString, 6); Console.WriteLine(subString);

If you build and run this sample, you ll see the following output:

You will probably build up an armory of useful methods for dealing with strings. It can be helpful to aggregate them together into a set of extension methods. Here s an example implementing the Right method that we ve used as an example in this chapter, but modifying it to work as an extension method, and also providing an equivalent to the version of Substring that takes both a start position and a length:

The rest of the code combines several string variables (apikey, callingAPI, apiKey) in the variable reqUrl to form the URL required by the search operation (i.e., http:// api.technorati.com/search key=[your_apikey]&query=[search_variable]).

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