Chilkat Examples

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Node.js Examples

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(Node.js) Encrypt File in Chunks using AES CBC

Demonstrates how to use the FirstChunk/LastChunk properties to encrypt a file chunk-by-chunk.

Important This example requires Chilkat v9.5.0.68 or later.

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() {

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

    var crypt = new chilkat.Crypt2();

    crypt.CryptAlgorithm = "aes";
    crypt.CipherMode = "cbc";
    crypt.KeyLength = 128;

    crypt.SetEncodedKey("000102030405060708090A0B0C0D0E0F","hex");
    crypt.SetEncodedIV("000102030405060708090A0B0C0D0E0F","hex");

    var fileToEncrypt = "qa_data/hamlet.xml";
    var facIn = new chilkat.FileAccess();
    var success = facIn.OpenForRead(fileToEncrypt);
    if (success !== true) {
        console.log("Failed to open file that is to be encrytped.");
        return;
    }

    var outputEncryptedFile = "qa_output/hamlet.enc";
    var facOutEnc = new chilkat.FileAccess();
    success = facOutEnc.OpenForWrite(outputEncryptedFile);
    if (success !== true) {
        console.log("Failed to encrypted output file.");
        return;
    }

    // Let's encrypt in 10000 byte chunks.
    var chunkSize = 10000;
    var numChunks = facIn.GetNumBlocks(chunkSize);

    crypt.FirstChunk = true;
    crypt.LastChunk = false;

    var bd = new chilkat.BinData();

    var i = 0;
    while (i < numChunks) {
        i = i+1;
        if (i == numChunks) {
            crypt.LastChunk = true;
        }

        // Read the next chunk from the file.
        // The last chunk will be whatever amount remains in the file..
        bd.Clear();
        facIn.FileReadBd(chunkSize,bd);

        // Encrypt.
        crypt.EncryptBd(bd);

        // Write the encrypted chunk to the output file.
        facOutEnc.FileWriteBd(bd,0,0);

        crypt.FirstChunk = false;
    }

    // Make sure both FirstChunk and LastChunk are restored to true after
    // encrypting or decrypting in chunks.  Otherwise subsequent encryptions/decryptions
    // will produce unexpected results.
    crypt.FirstChunk = true;
    crypt.LastChunk = true;

    facIn.FileClose();
    facOutEnc.FileClose();

    // Decrypt the encrypted output file in a single call using CBC mode:
    var decryptedFile = "qa_output/hamlet_dec.xml";
    success = crypt.CkDecryptFile(outputEncryptedFile,decryptedFile);
    // Assume success for the example..

    // Compare the contents of the decrypted file with the original file:
    var bSame = facIn.FileContentsEqual(fileToEncrypt,decryptedFile);
    console.log("bSame = " + bSame);

}

chilkatExample();

 

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