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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