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# ecdsa-sig-formatter
[](https://travis-ci.org/Brightspace/node-ecdsa-sig-formatter) [](https://coveralls.io/r/Brightspace/node-ecdsa-sig-formatter)
Translate between JOSE and ASN.1/DER encodings for ECDSA signatures
## Install
```sh
npm install ecdsa-sig-formatter --save
```
## Usage
```js
var format = require('ecdsa-sig-formatter');
var derSignature = '..'; // asn.1/DER encoded ecdsa signature
var joseSignature = format.derToJose(derSignature);
```
### API
---
#### `.derToJose(Buffer|String signature, String alg)` -> `String`
Convert the ASN.1/DER encoded signature to a JOSE-style concatenated signature.
Returns a _base64 url_ encoded `String`.
* If _signature_ is a `String`, it should be _base64_ encoded
* _alg_ must be one of _ES256_, _ES384_ or _ES512_
---
#### `.joseToDer(Buffer|String signature, String alg)` -> `Buffer`
Convert the JOSE-style concatenated signature to an ASN.1/DER encoded
signature. Returns a `Buffer`
* If _signature_ is a `String`, it should be _base64 url_ encoded
* _alg_ must be one of _ES256_, _ES384_ or _ES512_
## Contributing
1. **Fork** the repository. Committing directly against this repository is
highly discouraged.
2. Make your modifications in a branch, updating and writing new unit tests
as necessary in the `spec` directory.
3. Ensure that all tests pass with `npm test`
4. `rebase` your changes against master. *Do not merge*.
5. Submit a pull request to this repository. Wait for tests to run and someone
to chime in.
### Code Style
This repository is configured with [EditorConfig][EditorConfig] and
[ESLint][ESLint] rules.
[EditorConfig]: http://editorconfig.org/
[ESLint]: http://eslint.org
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