node-webcrypto-ossl

We wanted to be able to write Javascript that used crypto on both the client and the server but we did not want to rely on Javascript implementations of crypto. The only native cryptography availible in browser is Web Crypto, this resulted in us creating a node-webcrypto-ossl a native polyfil for WebCrypto based on Openssl.

Table Of Contents

• WARNING
• Installing
  • Clone Repo
  • Install Dependencies
  • Install
  • Test
• Threat Model
  • Assumptions
  • Threats From Weak Cryptography
  • Threats From Improper Use Of Cryptography
• Bug Reporting
• Related

WARNING

At this time this solution should be considered suitable for research and experimentation, further code and security review is needed before utilization in a production application.

Installation

Clone Repo

git clone https://github.com/PeculiarVentures/node-webcrypto-ossl
cd node-webcrypto-ossl

Install Dependencies

npm install node-gyp -g
npm install typescript -g
npm install tsd -g
npm install mocha -g

Install

npm install

Test

mocha

KeyStorage

To use KeyStorage you shoud init WebCrypto with directory option. If directory option is missing then keyStorage is null

var WebCrypto = require("node-webcrypto-ossl");

var webcrypto = new WebCrypto({
  directory: "key_storage"
})

KeyStorage implements interface of W3 Storage

var keyStorage = webcrypto.keyStorage;

// generating RSA key
webcrypto.subtle.generateKey({
    name: "RSASSA-PKCS1-v1_5",
    modulusLength: 1024,
    publicExponent: new Uint8Array([1, 0, 1]),
    hash: {
      name: "SHA-1"
    }
  },
    false,
    ["sign", "verify"]
  )
  .then(function(keyPairs){
    /** 
     * saving private RSA key to KeyStorage
     * creates file ./key_storage/prvRSA-1024.json
     */
    keyStorage.setItem("prvRSA-1024", keyPairs.privateKey);
  })

To get key from KeyStorage

var rsaKey = webcrypto.getItem("prvRSA-1024");

Threat Model

The threat model is defined in terms of what each possible attacker can achieve.

Assumptions

TODO: ADD ASSUMPTIONS

Threats From A node-webcrypto-ossl Defect

TODO: ADD THREATS FROM HANCOCK SERVICE COMPROMISE

Threats From Weak Cryptography

TODO: ADD THREATS FROM WEAK CRYPTOGRAPHY

Threats From Improper Use Of Cryptography

TODO: ADD THREATS FOR IMPROPER USE OF CRYPTOGRAPHY

Bug Reporting

Please report bugs either as pull requests or as issues in the issue tracker. node-webcrypto-ossl has a full disclosure vulnerability policy. Please do NOT attempt to report any security vulnerability in this code privately to anybody.

Related

• node-webcrypto-p11
• MSR WebCrypto Polyfill
• OpenSSL
• WebCrypto Examples
• OpenSSL AES GCM encrypt/decrypt