Chilkat Examples

ChilkatHOMEAndroid™Classic ASPCC++C#Mono C#.NET Core C#C# UWP/WinRTDataFlexDelphi ActiveXDelphi DLLVisual FoxProJavaLianjaMFCObjective-CPerlPHP ActiveXPHP ExtensionPowerBuilderPowerShellPureBasicPythonRubySQL ServerSwiftTclUnicode CUnicode C++Visual Basic 6.0VB.NETVB.NET UWP/WinRTVBScriptXojo PluginNode.jsExcel

Node.js Examples


ASN.1
Amazon S3
Amazon S3 (new)
Amazon SES
Amazon SNS
Amazon SQS
Async
Azure Cloud Storage
Azure Service Bus
Bounced Email
Box
CSR
CSV
Certificates
Compression
DKIM / DomainKey
DSA
Diffie-Hellman
Digital Signatures
Dropbox
Dynamics CRM
ECC
Email Object
Encryption
FTP
Facebook
Firebase
GeoOp
Google APIs
Google Calendar
Google Cloud Storage
Google Drive
Gzip
HTML-to-XML/Text
HTTP
HTTP Misc
IMAP
JSON
JSON Web Encryption (JWE)
JSON Web Signatures (JWS)
JSON Web Token (JWT)
Java KeyStore (JKS)

Jira
MHT / HTML Email
MIME
Microsoft Graph
NTLM
OAuth1
OAuth2
OneDrive
OpenSSL
Outlook
PEM
PFX/P12
POP3
PRNG
PayPal
Peoplevox
QuickBooks
REST
REST Misc
RSA Encryption
SCP
SFTP
SMTP
SSH
SSH Key
SSH Tunnel
SharePoint
Shopify
Socket/SSL/TLS
Spider
Stream
Stripe
SugarCRM
Tar Archive
Twitter
VoiceBase
Walmart
WebSocket
XAdES
XML
XML Digital Signatures
XMP
Xero
Zip
curl
eBay

 

 

 

(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') {  
    var chilkat = require('chilkat_node10_win32'); 
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('chilkat_node10_arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('chilkat_node10_linux32');
    } else {
        var chilkat = require('chilkat_node10_linux64');
    }
} else if (os.platform() == 'darwin') {
    var chilkat = require('chilkat_node10_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;
    }

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

    //  Now 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();

 

© 2000-2016 Chilkat Software, Inc. All Rights Reserved.