JavaScript Requires Chilkat v11.0.0+

RSA Encrypt and Decrypt Credit Card Numbers

See more RSA Examples

_LANGUAGE_ sample code to RSA public-key encrypt and decrypt credit card numbers. The RSA key is loaded from an unencrypted PKCS8 file. Chilkat provides many ways of setting the key -- loading from both encrypted and unencrypted PEM, PKCS8, DER, PVK, etc. Keys may be loaded from files or in-memory representations. (The RSA component also provides the ability to generate RSA 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();

var privKey = new CkPrivateKey();

//  Load an RSA private key from a file:
success = privKey.LoadAnyFormatFile("rsaPrivateKey.key","");
if (success == false) {
    console.log(privKey.LastErrorText);
    return;
}

//  Get the public part of the private key.
var pubKey = new CkPublicKey();
privKey.ToPublicKey(pubKey);

success = rsa.UsePublicKey(pubKey);
if (success == false) {
    console.log(rsa.LastErrorText);
    return;
}

//  Encrypt a VISA credit card number:
//  1234-5678-0000-9999
var ccNumber = "1234567800009999";

var usePrivateKey = false;
rsa.EncodingMode = "base64";
var encryptedStr = rsa.EncryptStringENC(ccNumber,usePrivateKey);
console.log("Encrypted:");
console.log(encryptedStr);

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

rsaDecryptor.EncodingMode = "base64";
rsaDecryptor.UsePrivateKey(privKey);

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

console.log("Decrypted:");
console.log(decryptedStr);

//  Important: RSA encryption should only be used to encrypt small amounts of data.
//  It is typically used for encrypting symmetric encryption
//  keys such that a symmetric encryption algorithm, such as 
//  AES is then used to encrypt/decrypt bulk data.