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var bignum = require('bignum');

var rsa = require('./modules/rsa.js');

var bitslength = 256; // It must be more than 1028 o equal at least

var keys = rsa.generateKeys(bitslength);

var message = "Message to encrypt";

var m=bignum.fromBuffer(Buffer.from(message));

console.log("My message is: " +message+ " en bignum "+ m.toString());

console.log("Bignum of message: "+ m.toString());

//Encrypt and Decrypt

console.log("\n################ Encrypt and Decrypt a NUMBER ################");

var c = keys.publicKey.encrypt(m);

console.log("Encrypted c: "+ c.toString());

//Decrypt the message

var d = keys.privateKey.decrypt(c);

console.log("Decrypted d :" + d.toString());

console.log(bignum.toBuffer(d).toString());

if (message == bignum.toBuffer(d)){

console.log("All works!!");

}

console.log("\n");

var m = bignum(2);

console.log("My message is: " + m.toString());

//Encrypt and Decrypt

console.log("\n################ Encrypt and Decrypt ################");

//Encrypt the message

var c = keys.publicKey.encrypt(m);

console.log("Encrypted c: "+ c.toString());

//Decrypt the message

var d = keys.privateKey.decrypt(c);

console.log("Decrypted d :" + d.toString());

if (m.toString() == d.toString()){

console.log("All works!!");

}

// Blind and Verify

console.log("\n################ Blind and Verfy ################");

// Create a rundom number while the randome isn't a 1

do {

r = bignum.rand(keys.publicKey.n);

} while(r <= 1)

//Blind the message

var bm = m.mul(r.powm(keys.publicKey.e, keys.publicKey.n)).mod(keys.publicKey.n);

console.log("Blind message bm: "+ bm.toString());

//Sing the message

var bs = keys.privateKey.sign(bm);

console.log("Blind signature bs: "+ bs.toString());

//Do the revers of the message (This only can be did it by the user who write the message)

var s = bs.mul(r.invertm(keys.publicKey.n)).mod(keys.publicKey.n);

console.log("Message without blind: " + s.toString());

// Verify the signed message to see

if (m == keys.publicKey.verify(s).toString() ){

console.log("Verify corretly: My Message: " + keys.publicKey.verify(s).toString());

}