Node.js

Duplicate openssl dgst -sha256 -verify pubKey.pem -signature signature.sig in.dat

See more OpenSSL Examples

Demonstrates how to duplicate this OpenSSL command:

openssl dgst -sha256 -verify pubKey.pem -signature signature.sig in.dat

The in.dat file contains the original data that was signed, and can contain text or binary data of any type. The above OpenSSL command does the following:

1. Creates a SHA256 digest of the contents of the input file.
2. Verifies the SHA256 digest using the public key.

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.

    var pubKey = new chilkat.PublicKey();

    // Load the public key from an PEM file:
    success = pubKey.LoadFromFile("pubKey.pem");
    if (success == false) {
        console.log(pubKey.LastErrorText);
        return;
    }

    // Load the data of the original file that was signed.
    var bdFileData = new chilkat.BinData();
    success = bdFileData.LoadFile("in.dat");

    // Load the signature.
    var bdSig = new chilkat.BinData();
    success = bdSig.LoadFile("signature.sig");

    var rsa = new chilkat.Rsa();

    // Import the public key into the RSA component:
    success = rsa.UsePublicKey(pubKey);
    if (success == false) {
        console.log(rsa.LastErrorText);
        return;
    }

    // OpenSSL uses big-endian.
    rsa.LittleEndian = false;

    success = rsa.VerifyBd(bdFileData,"sha256",bdSig);
    if (success !== true) {
        console.log(rsa.LastErrorText);
        console.log("The signature was invalid.");
        return;
    }

    console.log("The signature was verified.");

}

chilkatExample();