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https://github.com/juhoen/hybrid-crypto-js

RSA+AES hybrid encryption implementation for JavaScript. Works with Node.js, React Native and modern browsers.
https://github.com/juhoen/hybrid-crypto-js

aes aes-256 decrypt decryption encrypt encryption hybrid hybrid-crypto-js node nodejs react-native rsa rsa-aes web webpack

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RSA+AES hybrid encryption implementation for JavaScript. Works with Node.js, React Native and modern browsers.

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# Hybrid Crypto JS



[![NPM](https://nodei.co/npm/hybrid-crypto-js.png)](https://nodei.co/npm/hybrid-crypto-js/)



## Introduction






_Hybrid Crypto JS_ is a hybrid (RSA+AES) encryption and decryption toolkit for JavaScript. _Hybrid Crypto JS_ combines RSA and AES encryption algorithms, making it possible to encrypt and decrypt large messages efficiently. This cross-platform library is based on [Forge](https://github.com/digitalbazaar/forge). _Hybrid Crypto JS_ can be used in browsers, Node.js, or React Native.



## Documentation






**Getting started**



-   [Introduction](#introduction)

-   [Documentation](#documentation)

-   [Installation](#installation)



**Features**



-   [Initialization](#initialization)

-   [Encryption](#encryption)

-   [Decryption](#decryption)

-   [Signatures](#signatures)

-   [Verifying](#verifying)

-   [RSA key pairs](#rsa-key-pairs)



### Installation






```

npm install hybrid-crypto-js

```



### Importing



**Node.js**



```js

var RSA = require('hybrid-crypto-js').RSA;

var Crypt = require('hybrid-crypto-js').Crypt;

```



**React Native**



```js

import { Crypt, RSA } from 'hybrid-crypto-js';

```



**Web**



Download minified _hybrid-crypto.min.js_ file [here](https://raw.githubusercontent.com/juhoen/hybrid-crypto-js/master/web/hybrid-crypto.min.js).



```html



```



## Features



### Initialization






```js

// Basic initialization

var crypt = new Crypt();

var rsa = new RSA();



// Increase amount of entropy

var entropy = 'Random string, integer or float';

var crypt = new Crypt({ entropy: entropy });

var rsa = new RSA({ entropy: entropy });



// Select default message digest

var crypt = new Crypt({ md: 'sha512' });



// Select AES or RSA standard

var crypt = new Crypt({

    // Default AES standard is AES-CBC. Options are:

    // AES-ECB, AES-CBC, AES-CFB, AES-OFB, AES-CTR, AES-GCM, 3DES-ECB, 3DES-CBC, DES-ECB, DES-CBC

    aesStandard: 'AES-CBC',

    // Default RSA standard is RSA-OAEP. Options are:

    // RSA-OAEP, RSAES-PKCS1-V1_5

    rsaStandard: 'RSA-OAEP',

});



// Alternate AES keysize (some AES algorithms requires specific key size)

var crypt = new Crypt({

    aesKeySize: 192, // Defaults to 256

});

```



### Encryption






_Hybrid Crypto JS_ provides basic encryption function that also supports multiple RSA keys, with or without [signature](#signatures). An encrypted message is a JSON formatted string.



```js

var message = 'Hello world!';



// Encryption with one public RSA key

var encrypted = crypt.encrypt(publicKey, message);



// Function also supports encryption with multiple RSA public keys

var encrypted = crypt.encrypt([publicKey1, publicKey2, publicKey3], message);



// Encryption with signature

var encrypted = crypt.encrypt(publicKey, message, signature);

```



**Pretty-printed sample output**



```js

{

    "v": "hybrid-crypto-js_0.1.2",        // Current package version

    "iv": "CmtyaZTyzoAp1mTNUTztic0v1...", // Initialization vector

    "keys": {                             // Encrypted AES keys by RSA fingerprints

        "85:3d:10:e1:56...": "bHaTF9...",

        "d3:48:6a:e9:13...": "t9eds3..."

    },

    "cipher": "+iwVFsC2dECBQvwcm9DND..."  // Actual encrypted message

    "signature": "sdL93kfdm12feds3C2..."  // Signature (optional)

}



```



### Decryption






Decrypting message with _Hybrid Crypto JS_ is as easy as encrypting. Decrypt function can decrypt any message which has been encrypted with key pair's public key. The decrypted message is a JSON object containing a message and an optional signature.



```js

var encrypted = '{"v":"hybrid-crypto-js_0.1.0","iv":"CmtyaZTyzoAp1mTN...';



// Decrypt encryped message with private RSA key

var decrypted = crypt.decrypt(privateKey, encrypted);



// Get decrypted message

var message = decrypted.message;

```



**Sample output**



```js

{

    message: "Hello world!",            // Actual decrypted message

    signature: "sdL93kfdm12feds3C2..."  // Signature (optional)

}

```



### Signatures






_Hybrid Crypto JS_ provides simple message signing. The encrypted message can be signed with the issuer's private key.



```js

var message = 'Hello world!';



// Create a signature with ISSUER's private RSA key

var signature = crypt.signature(issuerPrivateKey, message);



// Encrypt message with RECEIVERS public RSA key and attach the signature

var encrypted = crypt.encrypt(receiverPublicKey, message, signature);



// Select default message digest

var crypt = new Crypt({

    md: 'sha512', // Options: sha1, sha256, sha384, sha512, and md5

});

```



### Verifying






The message receiver needs to have a message issuer's public RSA key in order to verify the message issuer.



```js

// Encrypted message with signature

var encrypted = '{"v":"hybri... ..."signature":"sdL93kfd...';



// Decrypt message with own (RECEIVER) private key

var decrypted = crypt.decrypt(receiverPrivateKey, encrypted);



// Verify message with ISSUER's public key

var verified = crypt.verify(

    issuerPublicKey,

    decrypted.signature,

    decrypted.message,

);

```



Verification function returns _true_ or _false_ depending on whether the verification was successful.



### RSA key pairs






_Hybrid Crypto JS_ RSA key generation function is based in [Forge](https://github.com/digitalbazaar/forge#rsa) key pair generation function. As a difference, _Hybrid Crypto JS_ returns key pair in PEM format.



```js

// Initialize RSA-class

var rsa = new RSA();



// Generate RSA key pair, default key size is 4096 bit

rsa.generateKeyPair(function(keyPair) {

    // Callback function receives new key pair as a first argument

    var publicKey = keyPair.publicKey;

    var privateKey = keyPair.privateKey;

});



// ... or:

rsa.generateKeyPairAsync().then(keyPair => {

    var publicKey = keyPair.publicKey;

    var privateKey = keyPair.privateKey;

});



// Generate 1024 bit RSA key pair

rsa.generateKeyPair(function(keyPair) {

    // Callback function receives new 1024 bit key pair as a first argument

    var publicKey = keyPair.publicKey;

    var privateKey = keyPair.privateKey;

}, 1024); // Key size



// RSA can be also initialized with options

var rsa = new RSA({

    keySize: 4096,

});

```