Algorithms-In-JavaScript/doubleTransposition.js at master · shams-nahid/Algorithms-In-JavaScript · GitHub

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// let message = 'DEPARTMENTOFCOMPUTERSCIENCEANDENGINEERING';
letmessage='abcdefghijklmn';
letsector=3;

lettransposition=(myString,column,cb)=>{

createMatrix(myString,column,(err,matrix,row)=>{
lettransposedMessage='';
letdecryptMessage='';

if(err){

}else{
for(letj=0;j<column;j++){
for(leti=0;i<row;i++){
if(matrix[i][j]==null){
decryptMessage+='$';
}else{
transposedMessage+=matrix[i][j];
decryptMessage+=matrix[i][j];
}
}
}
returncb(null,transposedMessage,decryptMessage,row);
}
});
};

letcreateMatrix=(myString,column,cb)=>{
myString=myString.split('');
letrow,
length=myString.length,
tempRowF=length/column,
tempRowR=parseInt(length/column),
matrix=newArray();

if(tempRowR==tempRowF){
row=tempRowR;
}else{
row=tempRowR+1;
}

letindex=0;

for(leti=0;i<row;i++){
matrix[i]=newArray();
}

for(leti=0;i<row;i++){
for(letj=0;j<column;j++){
if(myString[index]==' '){
matrix[i][j]='-';
}elseif(index>=length){
matrix[i][j]=null;
}else{
matrix[i][j]=myString[index];
}
index++;
}
}

returncb(null,matrix,row);
};

letdecryptMessage=(encryptedMessage,column,cb)=>{
encryptedMessage=encryptedMessage.split('');
letdecryptMessage='';
letreservedMessage='';
letlength=encryptedMessage.length-1;
letindex=0;
for(leti=0;i<=length;i++){
if(encryptedMessage[index]=='$'){
reservedMessage+=encryptedMessage[index];
}else{
decryptMessage+=encryptedMessage[index];
reservedMessage+=encryptedMessage[index];
}

index+=column;

if(index>=length){
index=index-length;
}
}

console.log('--------------------------');
console.log('Decrypt: '+decryptMessage);
console.log('Reserved: '+reservedMessage);

cb(null,decryptMessage,reservedMessage);
};

transposition(message,sector,(err,encryptMessage,reservedMessage,row)=>{
console.log('MESSAGE: '+message+'\n');

if(err){

}else{
transposition(encryptMessage,sector,(err,encryptMessage,reservedMessage,row)=>{
if(err){

}else{
console.log('AFTER ENCRYPTION');
console.log(' Encrypted message: '+encryptMessage);
console.log(' Reserved message:'+reservedMessage);
}
decryptMessage(reservedMessage,row,(err,decryptedMessage,reservedMessage)=>{
if(err){

}else{
console.log('First Dec: '+decryptedMessage);
console.log('First Res: '+reservedMessage);
decryptMessage(reservedMessage,row,(err,decryptedMessage,reservedMessage)=>{
if(err){

}else{
console.log('AFTER DECRYPTION');
console.log(' Decrypted message: '+decryptedMessage);
console.log(' Reserved message: '+reservedMessage);
}
});
}
});
});
}
});