(JavaScript) Generate RSA Key and Sign a String

See more RSA Examples

Note: This example requires Chilkat v11.0.0 or greater.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

var success = false;

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

var rsa = new CkRsa();

// Generate a 2048-bit RSA key.
var privKey = new CkPrivateKey();
success = rsa.GenKey(2048,privKey);

rsa.UsePrivateKey(privKey);

// Return the signature in hex.
rsa.EncodingMode = "hex";

var strData = "This is the string to be signed.";

// Sign the SHA256 hash of the string.
var hexSig = rsa.SignStringENC(strData,"sha256");

console.log(hexSig);

// Now verify the signature:
var pubKey = new CkPublicKey();
privKey.ToPublicKey(pubKey);
rsa.UsePublicKey(pubKey);

success = rsa.VerifyStringENC(strData,"sha256",hexSig);
if (success == true) {
    console.log("Signature verified!");
}
else {
    console.log(rsa.LastErrorText);
}

// Try it with an invalid signature:
success = rsa.VerifyStringENC(strData,"sha256","not a valid sig");
if (success == true) {
    console.log("Signature verified!");
}
else {
    console.log("Signature validation failed!");
}

// Try it with invalid data:
success = rsa.VerifyStringENC("Not the original data","sha256",hexSig);
if (success == true) {
    console.log("Signature verified!");
}
else {
    console.log("Signature validation failed!");
}