(JavaScript) 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.

Note: This example requires Chilkat v11.0.0 or greater.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

var success = false;

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

var rsa = new CkRsa();

// First load a public key object with a public key.
// In this case, we'll load it from a file.
var pubkey = new CkPublicKey();
success = pubkey.LoadFromFile("qa_data/pem/rsa_public.pem");
if (success == false) {
    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.UsePublicKey(pubkey);

// To get OAEP padding, set the PkcsPadding property equal to false
rsa.PkcsPadding = false;
rsa.OaepHash = "sha256";

// 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 CkRsa();

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

success = rsa2.UsePrivateKey(privKey);

// Make sure we have the same settings used for encryption.
rsa2.PkcsPadding = false;
rsa2.EncodingMode = "hex";
rsa2.OaepHash = "sha256";

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

console.log(originalStr);