dex/vendor/gopkg.in/square/go-jose.v2/README.md

# Go JOSE 

[![godoc](http://img.shields.io/badge/godoc-version_1-blue.svg?style=flat)](https://godoc.org/gopkg.in/square/go-jose.v1)
[![godoc](http://img.shields.io/badge/godoc-version_2-blue.svg?style=flat)](https://godoc.org/gopkg.in/square/go-jose.v2)
[![license](http://img.shields.io/badge/license-apache_2.0-blue.svg?style=flat)](https://raw.githubusercontent.com/square/go-jose/master/LICENSE)
[![build](https://travis-ci.org/square/go-jose.svg?branch=master)](https://travis-ci.org/square/go-jose)
[![coverage](https://coveralls.io/repos/github/square/go-jose/badge.svg?branch=master)](https://coveralls.io/r/square/go-jose)

Package jose aims to provide an implementation of the Javascript Object Signing
and Encryption set of standards. This includes support for JSON Web Encryption,
JSON Web Signature, and JSON Web Token standards.

**Disclaimer**: This library contains encryption software that is subject to
the U.S. Export Administration Regulations. You may not export, re-export,
transfer or download this code or any part of it in violation of any United
States law, directive or regulation. In particular this software may not be
exported or re-exported in any form or on any media to Iran, North Sudan,
Syria, Cuba, or North Korea, or to denied persons or entities mentioned on any
US maintained blocked list.

## Overview

The implementation follows the
[JSON Web Encryption](http://dx.doi.org/10.17487/RFC7516) (RFC 7516),
[JSON Web Signature](http://dx.doi.org/10.17487/RFC7515) (RFC 7515), and
[JSON Web Token](http://dx.doi.org/10.17487/RFC7519) (RFC 7519).
Tables of supported algorithms are shown below. The library supports both
the compact and full serialization formats, and has optional support for
multiple recipients. It also comes with a small command-line utility
([`jose-util`](https://github.com/square/go-jose/tree/v2/jose-util))
for dealing with JOSE messages in a shell.

**Note**: We use a forked version of the `encoding/json` package from the Go
standard library which uses case-sensitive matching for member names (instead
of [case-insensitive matching](https://www.ietf.org/mail-archive/web/json/current/msg03763.html)).
This is to avoid differences in interpretation of messages between go-jose and
libraries in other languages.

### Versions

We use [gopkg.in](https://gopkg.in) for versioning.

[Version 1](https://gopkg.in/square/go-jose.v1) is the old stable version:

    import "gopkg.in/square/go-jose.v1"

[Version 2](https://gopkg.in/square/go-jose.v2) is for new development:

    import "gopkg.in/square/go-jose.v2"

The interface for [go-jose.v1](https://gopkg.in/square/go-jose.v1) will remain
backwards compatible. No new feature development will take place on the `v1` branch,
however bug fixes and security fixes will be backported.

The interface for [go-jose.v2](https://gopkg.in/square/go-jose.v2) is mostly 
stable, but we suggest pinning to a particular revision for now as we still reserve
the right to make changes. New feature development happens on this branch.

New in [go-jose.v2](https://gopkg.in/square/go-jose.v2) is a
[jwt](https://godoc.org/gopkg.in/square/go-jose.v2/jwt) sub-package
contributed by [@shaxbee](https://github.com/shaxbee).

### Supported algorithms

See below for a table of supported algorithms. Algorithm identifiers match
the names in the [JSON Web Algorithms](http://dx.doi.org/10.17487/RFC7518)
standard where possible. The Godoc reference has a list of constants.

 Key encryption             | Algorithm identifier(s)
 :------------------------- | :------------------------------
 RSA-PKCS#1v1.5             | RSA1_5
 RSA-OAEP                   | RSA-OAEP, RSA-OAEP-256
 AES key wrap               | A128KW, A192KW, A256KW
 AES-GCM key wrap           | A128GCMKW, A192GCMKW, A256GCMKW
 ECDH-ES + AES key wrap     | ECDH-ES+A128KW, ECDH-ES+A192KW, ECDH-ES+A256KW
 ECDH-ES (direct)           | ECDH-ES<sup>1</sup>
 Direct encryption          | dir<sup>1</sup>

<sup>1. Not supported in multi-recipient mode</sup>

 Signing / MAC              | Algorithm identifier(s)
 :------------------------- | :------------------------------
 RSASSA-PKCS#1v1.5          | RS256, RS384, RS512
 RSASSA-PSS                 | PS256, PS384, PS512
 HMAC                       | HS256, HS384, HS512
 ECDSA                      | ES256, ES384, ES512

 Content encryption         | Algorithm identifier(s)
 :------------------------- | :------------------------------
 AES-CBC+HMAC               | A128CBC-HS256, A192CBC-HS384, A256CBC-HS512
 AES-GCM                    | A128GCM, A192GCM, A256GCM 

 Compression                | Algorithm identifiers(s)
 :------------------------- | -------------------------------
 DEFLATE (RFC 1951)         | DEF

### Supported key types

See below for a table of supported key types. These are understood by the
library, and can be passed to corresponding functions such as `NewEncrypter` or
`NewSigner`. Each of these keys can also be wrapped in a JWK if desired, which
allows attaching a key id.

 Algorithm(s)               | Corresponding types
 :------------------------- | -------------------------------
 RSA                        | *[rsa.PublicKey](http://golang.org/pkg/crypto/rsa/#PublicKey), *[rsa.PrivateKey](http://golang.org/pkg/crypto/rsa/#PrivateKey)
 ECDH, ECDSA                | *[ecdsa.PublicKey](http://golang.org/pkg/crypto/ecdsa/#PublicKey), *[ecdsa.PrivateKey](http://golang.org/pkg/crypto/ecdsa/#PrivateKey)
 AES, HMAC                  | []byte

## Examples

[![godoc](http://img.shields.io/badge/godoc-version_1-blue.svg?style=flat)](https://godoc.org/gopkg.in/square/go-jose.v1)
[![godoc](http://img.shields.io/badge/godoc-version_2-blue.svg?style=flat)](https://godoc.org/gopkg.in/square/go-jose.v2)

Examples can be found in the Godoc
reference for this package. The
[`jose-util`](https://github.com/square/go-jose/tree/v2/jose-util)
subdirectory also contains a small command-line utility which might be useful
as an example.