Node.js

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. Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

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

    var rsa = new chilkat.Rsa();

    //  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 chilkat.PrivateKey();
    success = rsa.GenKey(2048,privKey);
    if (success == false) {
        console.log(rsa.LastErrorText);
        return;
    }

    var pubKey = new chilkat.PublicKey();
    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 chilkat.Rsa();

    //  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 chilkat.Rsa();

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

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

    console.log(decryptedStr);

}

chilkatExample();