(Node.js) RSA Encrypt RSA/ECB/OAEPWithSHA1AndMGF1Padding

Demonstrates how to RSA encrypt using RSA/ECB/OAEPWithSHA1AndMGF1Padding. Also demonstrates RSA/ECB/OAEPWithSHA-256AndMGF1Padding. Both of these terms are from Java's JCE. Note: In this context, "ECB" doesn't actually mean anything. It's a symmetric cipher mode that doesn't apply (or make sense) in this context.

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-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

function chilkatExample() {

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    var rsa = new chilkat.Rsa();

    // First load a public key object with a public key.
    // In this case, we'll load it from a file.
    var pubkey = new chilkat.PublicKey();
    var success = pubkey.LoadFromFile("qa_data/pem/rsa_public.pem");
    if (success !== true) {
        console.log(pubkey.LastErrorText);
        return;
    }

    // RSA encryption is limited to small amounts of data. The limit
    // is typically a few hundred bytes and is based on the key size and
    // padding (OAEP vs. PKCS1_5).  RSA encryption is typically used for
    // encrypting hashes or symmetric (bulk encryption algorithm) secret keys.
    var plainText = "Time is an illusion. Lunchtime doubly so.";

    // Import the public key to be used for encrypting.
    success = rsa.ImportPublicKeyObj(pubkey);

    // To get OAEP padding, set the OaepPadding property:
    rsa.OaepPadding = true;

    // To use SHA1 or SHA-256, set the OaepHash property
    rsa.OaepHash = "sha256";
    // for SHA1 --
    rsa.OaepHash = "sha1";

    // Indicate we'll want hex output
    rsa.EncodingMode = "hex";

    // Encrypt..
    var usePrivateKey = false;
    var encryptedStr = rsa.EncryptStringENC(plainText,usePrivateKey);
    console.log(encryptedStr);

    // -------------------------------------------------
    // Now decrypt with the matching private key.
    var rsa2 = new chilkat.Rsa();

    var privKey = new chilkat.PrivateKey();
    success = privKey.LoadEncryptedPem("qa_data/pem/rsa_passwd.pem","passwd");
    if (success !== true) {
        console.log(privKey.LastErrorText);
        return;
    }

    success = rsa2.ImportPrivateKeyObj(privKey);

    // Make sure we have the same settings used for encryption.
    rsa2.OaepPadding = true;
    rsa2.EncodingMode = "hex";
    rsa2.OaepHash = "sha1";

    var originalStr = rsa2.DecryptStringENC(encryptedStr,true);

    console.log(originalStr);

}

chilkatExample();