Chilkat Examples

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Node.js Examples

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(Node.js) DSA Signature Create and Verify

Shows how to create a DSA (DSS) signature for the contents of a file. The first step is to create an SHA-1 hash of the file contents. The hash is signed using the Digital Signature Algorithm and the signature bytes are retrieved as a hex-encoded string.

The 2nd part of the example loads the signature and verifies it against the hash.

Install Chilkat for Node.js and Electron using npm at

Chilkat npm packages for Node.js

Chilkat npm packages for Electron

on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node11-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node11-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node11-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node11-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node11-linux64');
    }
} else if (os.platform() == 'darwin') {
    var chilkat = require('@chilkat/ck-node11-macosx');
}

function chilkatExample() {

    var success;

    // Use Chilkat Crypt to hash the contents of a file.
    // This unlocks both the crypt and DSA objects..
    var crypt = new chilkat.Crypt2();
    success = crypt.UnlockComponent("Anything for 30-day trial.");
    if (success !== true) {
        console.log(crypt.LastErrorText);
        return;
    }

    crypt.EncodingMode = "hex";
    crypt.HashAlgorithm = "sha-1";

    // Return the SHA-1 hash of a file.  The file may be any size.
    // The Chilkat Crypt component will stream the file when 
    // computing the hash, keeping the memory usage constant
    // and reasonable.
    // The 20-byte SHA-1 hash is returned as a hex-encoded string.
    var hashStr = crypt.HashFileENC("hamlet.xml");

    var dsa = new chilkat.Dsa();

    // Load a DSA private key from a PEM file.  Chilkat DSA
    // provides the ability to load and save DSA public and private
    // keys from encrypted or non-encrypted PEM or DER.
    // The LoadText method is for convenience only.  You may
    // use any means to load the contents of a PEM file into
    // a string.
    var pemPrivateKey;
    pemPrivateKey = dsa.LoadText("dsa_priv.pem");
    success = dsa.FromPem(pemPrivateKey);
    if (success !== true) {
        console.log(dsa.LastErrorText);
        return;
    }

    // You may optionally verify the key to ensure that it is a valid
    // DSA key.
    success = dsa.VerifyKey();
    if (success !== true) {
        console.log(dsa.LastErrorText);
        return;
    }

    // Load the hash to be signed into the DSA object:
    success = dsa.SetEncodedHash("hex",hashStr);
    if (success !== true) {
        console.log(dsa.LastErrorText);
        return;
    }

    // Now that the DSA object contains both the private key and hash,
    // it is ready to create the signature:
    success = dsa.SignHash();
    if (success !== true) {
        console.log(dsa.LastErrorText);
        return;
    }

    // If SignHash is successful, the DSA object contains the
    // signature.  It may be accessed as a hex or base64 encoded
    // string.  (It is also possible to access directly in byte array form via
    // the "Signature" property.)
    var hexSig = dsa.GetEncodedSignature("hex");
    console.log("Signature:");
    console.log(hexSig);

    // -----------------------------------------------------------
    // Step 2: Verify the DSA Signature
    // -----------------------------------------------------------

    var dsa2 = new chilkat.Dsa();

    // Load the DSA public key to be used for verification:
    var pemPublicKey;
    pemPublicKey = dsa2.LoadText("dsa_pub.pem");
    success = dsa2.FromPublicPem(pemPublicKey);
    if (success !== true) {
        console.log(dsa2.LastErrorText);
        return;
    }

    // Load the hash to be verified against the signature.
    success = dsa2.SetEncodedHash("hex",hashStr);
    if (success !== true) {
        console.log(dsa2.LastErrorText);
        return;
    }

    // Load the signature:
    success = dsa2.SetEncodedSignature("hex",hexSig);
    if (success !== true) {
        console.log(dsa2.LastErrorText);
        return;
    }

    // Verify:
    success = dsa2.Verify();
    if (success !== true) {
        console.log(dsa2.LastErrorText);
    }
    else {
        console.log("DSA Signature Verified!");
    }


}

chilkatExample();

 

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