Node.js

RSA Sign an Encoded Hash

See more RSA Examples

Demonstrates signing a hash (e.g., SHA256) provided as an encoded string (e.g., base64 or hex). Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    //  Assuming the smartcard/USB token is installed with the correct drivers from the manufacturer,
    //  this code can work on multiple platforms including Windows, MacOS, Linux, and iOS.

    //  Chilkat automatically detects and determines the way in which the HSM is used,
    //  which can be by PKCS11, Apple Keychain, Microsoft CNG / Crypto API, or ScMinidriver.

    var cert = new chilkat.Cert();

    //  Set the token/smartcard PIN prior to loading.
    cert.SmartCardPin = "123456";

    //  Specify the certificate by its common name.
    success = cert.LoadFromSmartcard("cn=chilkat-rsa-2048");
    if (success == false) {
        console.log(cert.LastErrorText);
        return;
    }

    console.log("Signing with the private key for this cert: " + cert.SubjectCN);

    //  Create data to be hashed and signed.
    var bd = new chilkat.BinData();
    var i;
    for (i = 0; i <= 100; i++) {
        bd.AppendEncoded("000102030405060708090A0B0C0D0E0F","hex");
    }

    var rsa = new chilkat.Rsa();

    //  Use the certificate's private key for signing.
    success = rsa.SetX509Cert(cert,true);
    if (success == false) {
        console.log(rsa.LastErrorText);
        return;
    }

    //  We'll first compute the hash and then pass the encoded hash to be signed.
    var sha256_base64 = bd.GetHash("sha256","base64");
    console.log("sha256 hash in base64 format: " + sha256_base64);

    //  Pass in the base64 hash and return a base64 signature.
    rsa.EncodingMode = "base64";
    var rsaSig_base64 = rsa.SignHashENC(sha256_base64,"sha256");
    if (success == false) {
        console.log(rsa.LastErrorText);
        return;
    }

    console.log("RSA signature as base64: " + rsaSig_base64);

}

chilkatExample();