webcrypto-liner
Advanced tools
A WebCrypto pollyfill that "smooths out" the rough-edges in existing User Agent implementations.
A polyfill for WebCrypto that "smooths out" the rough-edges in existing User Agent implementations.
Though WebCrypto is well supported across browsers, several browsers still have prefixed and buggy implementations. Additionally, they do not always support the same algorithms, for example, Edge does not support SHA1 or ECC while both Firefox and Chrome do.
NOTE: If you are not familiar with how to use the various capabilities of WebCrypto see this great example page.
webcrypto-liner is a wrapper for WebCrypto designed to address these issues, at the same time it was designed to be modular so that it can also be used for testing the addition of new algorithms to WebCrypto in the future.
Intentionally webcrypto-liner does not implement any cryptography though it does consume libraries that do. We strongly recommend you read "What’s wrong with in-browser cryptography?" before using this library.
The libraries webcrypto-liner relies on include:
| Package | Description | Size | Optional |
|---|---|---|---|
| asmcrypto.js | A performant JavaScript implementation of popular cryptographic utilities with performance in mind. | 131 KB | Yes |
| elliptic | Fast Elliptic Curve Cryptography in plain javascript | 130 KB | Yes |
| webcrypto-core | A input validation layer for WebCrypto polyfills 1 | 25 KB | No |
1 This library is compiled into webcrypto-liner.
webcrypto-liner will always try to use a native implementation of webcrypto, or a prefixed version of webcrypto, before it falls back to a Javascript implementation of a given algorithm. We have no control over the corresponding implementation and what it does, for example, it may not use window.crypto.getRandomValues even if it is available and the mechanism it uses to gather randomness may be both insecure and weak.
We have done no security review or take a position on the security of these third-party libraries. YOU HAVE BEEN WARNED.
To keep webcrypto-liner as small as possible (right now it is ~11kb without dependencies) it was designed to be modular, so if you do not need ECC support, do not include elliptic as a dependency and it will not be loaded.
If you do not load any of the dependencies that provide cryptographic implementations webcrypto-liner will work as an interoperability layer, very similar to webcrypto-shim.
webcrypto-liner supports the following algorithms and key lengths:
| Capability | Details |
|---|---|
| Encryption/Decryption | RSA-OAEP, AES-CBC, and AES-GCM |
| Sign/Verify | RSA-PSS, RSASSA_PKCS1-v1_5 and ECDSA |
| Hash | SHA-1, and SHA-224 |
| Derive Key/Bits | ECDH |
| Keywrap | AES-GCM, AES-CBC, AES-ECB 2 |
| ECC Curves | P-256, P-384, and P-512 |
| RSA Key Lengths | 1024, 2048, 3072, and 4096 |
| AES Key Lengths | 128, 192 and 256 |
2 ECB support is not defined by the WebCrypto specifications. Use of EBC in a safe way is hard, it was added for the purpose of enabling interoperability with an existing system. We recommend against its use unless needed for interoperability.
You can see the webcrypto-liner in use in the pv-webcrypto-tests page.
<head>
<!-- ... -->
<!-- ... -->
<!-- promise.js is needed for IE Promise implementation -->
<script src="https://www.promisejs.org/polyfills/promise-7.0.4.min.js"></script>
<script src="src/webcrypto-liner.js"></script>
</head>
<body>
<script>
crypto.subtle.generateKey({name: "AES-GCM", length: 192}, true, ["encrypt", "decrypt"])
.then(function(key){
return crypto.subtle.encrypt({
name: "AES-GCM",
iv: new Uint8Array([1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16]),
tagLength: 128
}, key, new Uint8Array([1,2,3,4,5]))
})
.then(function(enc){
console.log(new Uint8Array(enc));
})
.catch(function(err){
console.log(err.message); // Chrome throws: 192-bit AES keys are not supported
})
</script>
</body>
typescript
npm install typescript --global
The module has been designed to be useful in ES6 and ES5 projects. The default is ES5 with commonjs, to install and build you would run:
npm install
npm run build
The package also supports rollup and webpack, if you want a ES5 build with Webpack you would use the following commands:
npm install
npm run build:webpack
If you want a ES2015 build for rollup you would use the following commands:
npm install
npm run build:es2015
asymcrypto also has a fallback mechanism where it generates its own random numbers if not present.webcrypto-liner as just an interopability shim and do not use any of the optional third-party libraries it will be under 44 KB in size.window object so it wont work in Node at this time. With some minor changes it should also be able to work in Node also but you really should be using node-webcrypto-ossl on Node instead.FAQs
A WebCrypto polyfill that "smooths out" the rough-edges in existing User Agent implementations.
The npm package webcrypto-liner receives a total of 4,209 weekly downloads. As such, webcrypto-liner popularity was classified as popular.
We found that webcrypto-liner demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 2 open source maintainers collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
Security News
PyPI confirms no security flaws were exploited in the Ultralytics supply chain attack and highlights improvements for safer package publishing.
Security News
Research
The Socket Research Team breaks down a malicious wrapper package that uses obfuscation to harvest credentials and exfiltrate sensitive data.
Research
Security News
Attackers used a malicious npm package typosquatting a popular ESLint plugin to steal sensitive data, execute commands, and exploit developer systems.