Chilkat Examples

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Node.js Examples


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(Node.js) AES Encrypt and Decrypt a File

Node.js demonstrates how to AES encrypt a file of any size, and then decrypt.

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() {

    var crypt = new chilkat.Crypt2();

    //  Any string argument automatically begins the 30-day trial.
    var success = crypt.UnlockComponent("30-day trial");
    if (success !== true) {
        console.log(crypt.LastErrorText);
        return;
    }

    crypt.CryptAlgorithm = "aes";

    //  CipherMode may be "ecb" or "cbc"
    crypt.CipherMode = "cbc";

    //  KeyLength may be 128, 192, 256
    crypt.KeyLength = 256;

    //  The padding scheme determines the contents of the bytes
    //  that are added to pad the result to a multiple of the
    //  encryption algorithm's block size.  AES has a block
    //  size of 16 bytes, so encrypted output is always
    //  a multiple of 16.
    crypt.PaddingScheme = 0;

    //  An initialization vector is required if using CBC mode.
    //  ECB mode does not use an IV.
    //  The length of the IV is equal to the algorithm's block size.
    //  It is NOT equal to the length of the key.
    var ivHex = "000102030405060708090A0B0C0D0E0F";
    crypt.SetEncodedIV(ivHex,"hex");

    //  The secret key must equal the size of the key.  For
    //  256-bit encryption, the binary secret key is 32 bytes.
    //  For 128-bit encryption, the binary secret key is 16 bytes.
    var keyHex = "000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F";
    crypt.SetEncodedKey(keyHex,"hex");

    //  Encrypt a file, producing the .aes as output.
    //  The input file is unchanged, the output .aes contains the encrypted
    //  contents of the input file.

    //  Note: The .aes output file has no file format.  It is simply a stream
    //  of bytes that resembles random binary data.
    var inFile = "/Users/chilkat/testData/pdf/sample.pdf";
    var outFile = "/Users/chilkat/testData/p7m/sample.pdf.aes";
    success = crypt.CkEncryptFile(inFile,outFile);
    if (success !== true) {
        console.log(crypt.LastErrorText);
        return;
    }

    //  For demonstration purposes, a different instance of the object will be used
    //  for decryption.
    var decrypt = new chilkat.Crypt2();

    //  All settings must match to be able to decrypt:
    decrypt.CryptAlgorithm = "aes";
    decrypt.CipherMode = "cbc";
    decrypt.KeyLength = 256;
    decrypt.PaddingScheme = 0;
    decrypt.SetEncodedIV(ivHex,"hex");
    decrypt.SetEncodedKey(keyHex,"hex");

    //  Decrypt the .aes
    inFile = "/Users/chilkat/testData/p7m/sample.pdf.aes";
    outFile = "/Users/chilkat/testData/pdf/recovered.pdf";
    success = decrypt.CkDecryptFile(inFile,outFile);
    if (success == false) {
        console.log(decrypt.LastErrorText);
        return;
    }

    console.log("Success!");

}

chilkatExample();

 

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