(Node.js) Hash Binary Data (SHA256 and other hash algorithms)

Demonstrates how to hash binary bytes using SHA256, SHA384, SHA512, MD2, MD5, HAVAL, RIPEMD, etc.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOS

var os = require('os');
if (os.platform() == 'win32') {  
  var chilkat = require('@chilkat/ck-node23-win64'); 
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node23-linux-arm');
    } else if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node23-linux-arm64');
    } else {
        var chilkat = require('@chilkat/ck-node23-linux-x64');
    }
} else if (os.platform() == 'darwin') {
  var chilkat = require('@chilkat/ck-node23-mac-universal');
}

function chilkatExample() {

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

    // Let's load a binary file to get the bytes..
    var jpgData = new chilkat.BinData();
    var success = jpgData.LoadFile("qa_data/jpg/starfish.jpg");
    if (success !== true) {
        console.log("Failed to load file.");
        return;
    }

    jpgBytes = jpgData.GetBinary();

    var crypt = new chilkat.Crypt2();

    // Choose the hash algorithm.
    // Can be  "sha1", "sha256", "sha384", "sha512", "md2", "md5", "haval", "ripemd128", "ripemd160","ripemd256", or "ripemd320".
    crypt.HashAlgorithm = "sha256";

    hashBytes = crypt.HashBytes(jpgBytes);

    // Let's examine the hash as a hex string.
    var sb = new chilkat.StringBuilder();
    sb.AppendEncoded(hashBytes,"hex");
    console.log("SHA256 hash = " + sb.GetAsString());

    // We could alternatively hash the bytes and receive the hex result directly:
    crypt.EncodingMode = "hex";
    var hashHexStr = crypt.HashBytesENC(jpgBytes);
    console.log("SHA256 hash = " + hashHexStr);

}

chilkatExample();