Node.js

RSA Hash Binary Data and Sign (and Verify)

See more RSA Examples

Demonstrates how to sign the hash of binary data. Also demonstrates how to verify the RSA signature. Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

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

    // Load an RSA private key for signing.
    var privKey = new chilkat.PrivateKey();
    success = privKey.LoadEncryptedPemFile("qa_data/pem/rsa_passwd.pem","passwd");
    if (success == false) {
        console.log(privKey.LastErrorText);
        return;
    }

    var rsa = new chilkat.Rsa();
    rsa.UsePrivateKey(privKey);

    // We have some binary data (in hex) to sign
    var originalData = "0102030405060708090A";
    var bdData = new chilkat.BinData();
    bdData.AppendEncoded(originalData,"hex");

    // Hash (SHA-256) and sign the hash:
    var bdSignature = new chilkat.BinData();
    success = rsa.SignBd(bdData,"sha256",bdSignature);
    if (success == false) {
        console.log(rsa.LastErrorText);
        return;
    }

    // Show the RSA signature in base64
    console.log(bdSignature.GetEncoded("base64"));

    // ------------------------------------------
    // Get the public key from the private key
    var pubKey = new chilkat.PublicKey();
    privKey.ToPublicKey(pubKey);

    // Verify the signature..
    var rsa2 = new chilkat.Rsa();
    rsa2.UsePublicKey(pubKey);

    var bVerified = rsa2.VerifyBd(bdData,"sha256",bdSignature);
    console.log("signature verified: " + bVerified);

}

chilkatExample();