JavaScript Requires Chilkat v11.0.0+

RSA Encrypt and Decrypt Strings

See more RSA Examples

_LANGUAGE_ sample code to RSA public-key encrypt and decrypt strings using public and private keys. JavaScript

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();

//  This example also generates the public and private
//  keys to be used in the RSA encryption.
//  Normally, you would generate a key pair once,
//  and distribute the public key to your partner.
//  Anything encrypted with the public key can be
//  decrypted with the private key.  The reverse is 
//  also true: anything encrypted using the private
//  key can be decrypted using the public key.

//  Generate a 2048-bit key.  Chilkat RSA supports
//  key sizes ranging from 512 bits to 4096 bits.
var privKey = new CkPrivateKey();
success = rsa.GenKey(2048,privKey);
if (success == false) {
    console.log(rsa.LastErrorText);
    return;
}

var pubKey = new CkPublicKey();
privKey.ToPublicKey(pubKey);

var plainText = "Encrypting and decrypting should be easy!";

//  Start with a new RSA object to demonstrate that all we
//  need are the keys previously exported:
var rsaEncryptor = new CkRsa();

//  Encrypted output is always binary.  In this case, we want
//  to encode the encrypted bytes in a printable string.
//  Our choices are "hex", "base64", "url", "quoted-printable".
rsaEncryptor.EncodingMode = "hex";

//  We'll encrypt with the public key and decrypt with the private
//  key.
success = rsaEncryptor.UsePublicKey(pubKey);

var usePrivateKey = false;
var encryptedStr = rsaEncryptor.EncryptStringENC(plainText,usePrivateKey);
console.log(encryptedStr);

//  Now decrypt:
var rsaDecryptor = new CkRsa();

rsaDecryptor.EncodingMode = "hex";
success = rsaDecryptor.UsePrivateKey(privKey);

usePrivateKey = true;
var decryptedStr = rsaDecryptor.DecryptStringENC(encryptedStr,usePrivateKey);

console.log(decryptedStr);