Update keyFinder.js

a sub-function is used to assist the keyfinder to find the key

Author: winsonrich

Ciphers/keyFinder.js

@@ -24,3 +24,118 @@ function keyFinder(str){ // str is used to get the input of encrypted string
 }
 return 0; // return 0 if found nothing
 }
+
+/* this sub-function is used to assist the keyfinder to find the key */
+function caesarCipherEncodeAndDecodeEngine(inStr, numShifted)
+{
+let shiftNum = numShifted; 
+let charCode = 0;
+let outStr = "";
+let shftedcharCode = 0;
+let result = 0;
+
+for (let i=0; i<inStr.length; i++){
+
+charCode = inStr[i].charCodeAt();
+shftedcharCode = charCode + shiftNum;
+result = charCode;
+
+if ( (charCode>=48 && charCode<=57))
+{
+if ( shftedcharCode < 48 ){
+
+ let diff = Math.abs(48-1-shftedcharCode)%10;
+
+while( diff >= 10){
+ diff = diff%10;
+}
+document.getElementById("diffID").innerHTML = diff;
+
+shftedcharCode = 57-diff;
+
+result = shftedcharCode;
+}
+
+ else if ( shftedcharCode>=48 && shftedcharCode<=57 ){
+result = shftedcharCode;
+}
+
+else if ( shftedcharCode > 57 ){
+
+ let diff = Math.abs(57+1-shftedcharCode)%10;
+
+while( diff >= 10){
+ diff = diff%10;
+}
+document.getElementById("diffID").innerHTML = diff;
+
+shftedcharCode = 48+diff;
+
+result = shftedcharCode;
+}
+
+
+}
+
+else if ( (charCode>=65 && charCode<=90) )
+{
+
+ if (shftedcharCode <=64 ){
+
+ let diff = Math.abs(65-1-shftedcharCode)%26;
+
+while( (diff%26) >= 26){
+ diff = diff%26;
+}
+shftedcharCode = 90-diff;
+result = shftedcharCode;
+}
+
+ else if ( shftedcharCode>=65 && shftedcharCode<=90 ){
+result = shftedcharCode;
+}
+
+else if (shftedcharCode>90 ){
+let diff = Math.abs(shftedcharCode-1-90)%26;
+
+while( (diff%26) >= 26){
+ diff = diff%26;
+}
+shftedcharCode = 65+diff;
+result = shftedcharCode;
+}
+
+}
+
+else if ( (charCode>=97 && charCode<=122))
+{
+ if ( shftedcharCode<=96 ){
+
+ let diff = Math.abs(97-1-shftedcharCode)%26;
+
+while( (diff%26) >= 26){
+ diff = diff%26;
+}
+shftedcharCode = 122-diff;
+result = shftedcharCode;
+}
+
+ else if ( shftedcharCode>=97 && shftedcharCode<=122 ){
+result = shftedcharCode;
+}
+
+else if (shftedcharCode>122 ){
+let diff = Math.abs(shftedcharCode-1-122)%26;
+
+while( (diff%26) >= 26){
+ diff = diff%26;
+}
+shftedcharCode = 97+diff;
+result = shftedcharCode;
+}
+
+}
+outStr = outStr + String.fromCharCode(parseInt(result));
+}
+return outStr;
+}