Node.js

Verfies an RSA Signature

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Verifies an RSA signature against the original data. Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    // The following data was signed by the following example:
    // RSA Sign using a Private Key on a USB Token or Smartcard
    var bd = new chilkat.BinData();
    var i;
    for (i = 0; i <= 100; i++) {
        bd.AppendEncoded("000102030405060708090A0B0C0D0E0F","hex");
    }

    // Load the signature
    var bdSig = new chilkat.BinData();
    success = bdSig.LoadFile("rsaSignatures/test1.sig");
    if (success == false) {
        console.log("Failed to load the RSA signature");
        return;
    }

    // Get the public key to be used for signature verification.
    var pubKey = new chilkat.PublicKey();
    success = pubKey.LoadFromFile("rsaKeys/chilkat-rsa-2048.pem");
    if (success == false) {
        console.log(pubKey.LastErrorText);
        return;
    }

    var rsa = new chilkat.Rsa();
    success = rsa.UsePublicKey(pubKey);
    if (success == false) {
        console.log(rsa.LastErrorText);
        return;
    }

    // Verify the hash of the data against the signature.
    // We pass in the original data.  Internally, the hash is generated
    // and used to validate the signature.
    // Validating the RSA signature means two things:  
    // (1) the original data is exactly what was signed, and 
    // (2) it was signed by the owner of the RSA private key.
    success = rsa.VerifyBd(bd,"sha256",bdSig);

    if (success == false) {
        console.log(rsa.LastErrorText);
        console.log("Signature invalid.");
    }
    else {
        console.log("Signature valid.");
    }


}

chilkatExample();