Chilkat Examples

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Node.js Examples


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(Node.js) Example for both AES-128 and ChaCha20 to Encrypt Binary Data

Demonstrates the use of the new EncryptBd and DecryptBd methods introduced in Chilkat v9.5.0.67 to encrypt/decrypt binary bytes.

Note: This example requires Chilkat v9.5.0.67 or greater.

Install Chilkat for Node.js using npm at

Chilkat npm packages for Node.js and Electron
on Windows, Linux, MacOSX, and ARM

Supports Node.js 4.*, 5.*, 6.*, 7.*, 8.*, and Electron 1.6.* and 1.7.*

var os = require('os');
if (os.platform() == 'win32') {  
    var chilkat = require('chilkat_node6_win32'); 
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('chilkat_node6_arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('chilkat_node6_linux32');
    } else {
        var chilkat = require('chilkat_node6_linux64');
    }
} else if (os.platform() == 'darwin') {
    var chilkat = require('chilkat_node6_macosx');
}

function chilkatExample() {

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

    //  Load a small JPG file to be encrypted/decrypted.
    var jpgBytes = new chilkat.BinData();
    var success = jpgBytes.LoadFile("qa_data/jpg/starfish.jpg");
    if (success !== true) {
        console.log("Failed to load JPG file.");
        return;
    }

    //  Show the unencrypted JPG bytes in Base64 format.
    //  (The "base64_mime" encoding was added in Chilkat v9.5.0.67.
    //  The "base64" encoding emits a single line of base64, whereas
    //  "base64_mime" will emit multi-line base64 as it would appear
    //  in MIME.)
    console.log(jpgBytes.GetEncoded("base64_mime"));

    //  Sample base64_mime JPG data:

    //  	/9j/4AAQSkZJRgABAgEASABIAAD/7Q18UGhvdG9zaG9wIDMuMAA4QklNA+0AAAAAABAASAAAAAEA
    //  	AQBIAAAAAQABOEJJTQPzAAAAAAAIAAAAAAAAAAE4QklNBAoAAAAAAAEAADhCSU0nEAAAAAAACgAB
    //  	AAAAAAAAAAI4QklNA/UAAAAAAEgAL2ZmAAEAbGZmAAYAAAAAAAEAL2ZmAAEAoZmaAAYAAAAAAAEA
    //  	MgAAAAEAWgAAAAYAAAAAAAEANQAAAAEALQAAAAYAAAAAAAE4QklNBBQAAAAAAAQAAAABOEJJTQQM
    //  	...

    var crypt = new chilkat.Crypt2();

    //  Specify the encryption to be used.
    //  First we'll do AES-128 CBC
    crypt.CryptAlgorithm = "aes";
    crypt.CipherMode = "cbc";
    crypt.KeyLength = 128;

    var ivHex = "000102030405060708090A0B0C0D0E0F";
    crypt.SetEncodedIV(ivHex,"hex");

    var keyHex = "000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F";
    crypt.SetEncodedKey(keyHex,"hex");

    //  Do the in-place 128-bit AES CBC encryption.
    //  The contents of jpgBytes are replaced with the encrypted bytes.
    success = crypt.EncryptBd(jpgBytes);
    if (success !== true) {
        console.log(crypt.LastErrorText);
        return;
    }

    //  Examine the JPG bytes again.  The bytes should be different because they are encrypted:
    console.log(jpgBytes.GetEncoded("base64_mime"));

    //  Sample base64_mime encrypted JPG data:

    //  	sbz0babt1WCkQf5xKMdg/baZAcUBO5GVUUDF2BjVqmd+HrqKN+t6hAcqakL/bdo0q9hYmow0Tp1e
    //  	AQ9V9DOiifQUZqWVkR+kL/c45bq8JGFDvgNl0djPt+yYhV789IB/fPH0upx+/ad++WNOlv1IxGMr
    //  	Y1x1oERU/IsiEzafUJdI4kZ6FQo2IPGMF/Rm1h79I7hP1yYUFxvJyz+PzaySAUH1nLsNHyDVY5VY
    //  	O90aH3steRSYbz8C8UF9wQ3qqEIXQNnnixvoNDnmHyY39VoVBI5F6rnPwYDfAk2t8tmuryFqvwAu
    //  	...

    //  Decrypt to restore back to the original:
    success = crypt.DecryptBd(jpgBytes);
    if (success !== true) {
        console.log(crypt.LastErrorText);
        return;
    }

    console.log(jpgBytes.GetEncoded("base64_mime"));

    //  	/9j/4AAQSkZJRgABAgEASABIAAD/7Q18UGhvdG9zaG9wIDMuMAA4QklNA+0AAAAAABAASAAAAAEA
    //  	AQBIAAAAAQABOEJJTQPzAAAAAAAIAAAAAAAAAAE4QklNBAoAAAAAAAEAADhCSU0nEAAAAAAACgAB
    //  	AAAAAAAAAAI4QklNA/UAAAAAAEgAL2ZmAAEAbGZmAAYAAAAAAAEAL2ZmAAEAoZmaAAYAAAAAAAEA
    //  	MgAAAAEAWgAAAAYAAAAAAAEANQAAAAEALQAAAAYAAAAAAAE4QklNBBQAAAAAAAQAAAABOEJJTQQM
    //  	...

    //  ----------------------------------------------------------------------------------
    //  To do chacha20 encryption, just change the settings:

    crypt.CryptAlgorithm = "chacha20";
    crypt.KeyLength = 256;
    //  The initial count is the initial block counter for the chacha20 algorithm.
    //  It can be any integer, but must be set to the same when decrypting.
    crypt.InitialCount = 22;

    success = crypt.EncryptBd(jpgBytes);
    //  jpgBytes now contains chacha20 encrypted bytes.

    success = crypt.DecryptBd(jpgBytes);
    //  jpgBytes is now restored back to the original unencrypted by bytes.

    //  Save the bytes to a file..
    success = jpgBytes.WriteFile("qa_output/starfish.jpg");

    console.log("Success.");

}

chilkatExample();

 

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