prototype functional

passy.js

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+/*
+ * Given a "text" (i.e. "amazon.com") and a "secret" (i.e. "mypassword") return an
+ * array of four Passy'fied passwords.
+ */
+var passy = function(text,secret)
+{
+	/*
+	 * function to make a password out of a hexadecimal string "0123456789abcdef".
+	 *
+	 * + substitutes symbols for every other digit [0-9]
+	 * + capitalize every other alpha [a-f]
+	 *
+	 */
+	var passify = function(hexstr)
+	{
+		// lookup table to convert a single character to a symbol
+		var symtab = { "1":"!", "2":"@", "3":"#", "4":"$", "5":"%", "6":"^", "7":"&", "8":"*", "9":"(", "0":")" };
+
+		// convert every other numerical character to a symbol
+		var odd = true;
+		for(i=0;i<hexstr.length;++i)
+		{
+			// is this a digit-character?
+			if ( /[0-9]/.test(hexstr[i]) )
+			{
+				if ( odd )
+				{
+					// substitute symbol for odd digit-characters, leave even digit-characters alone!
+					hexstr = hexstr.slice(0,i) + symtab[hexstr[i]] + hexstr.slice(i+1,hexstr.length);
+				}
+
+				// flip odd toggle
+				odd = !odd;
+			}
+		}
+
+		// alternate uppercase/lowercase for alpha characters
+		odd = true;
+		for(i=0;i<hexstr.length;++i)
+		{
+			// is this an alpha-character?
+			if ( /[a-f]/i.test(hexstr[i]) )
+			{
+				// set odd alpha-characters to uppercase, and even alpha-characters to lowercase
+				hexstr = 
+					hexstr.slice(0,i) + 
+					( odd ? hexstr[i].toUpperCase() : hexstr[i].toLowerCase()) + 
+					hexstr.slice(i+1,hexstr.length);
+
+				// flip odd toggle
+				odd = !odd;
+			}
+		}
+
+		// finished
+		return hexstr;
+	}
+
+	// get hmac
+	var hmac = new jsSHA(text.toLowerCase(), "ASCII").getHMAC(secret, "ASCII", "HEX");
+
+	// split into four 10 character strings and "passify", and return the array
+	return [
+		passify(hmac.slice( 0,10)),
+		passify(hmac.slice(10,20)),
+		passify(hmac.slice(20,30)),
+		passify(hmac.slice(30,40))];
+}