210 lines
8.8 KiB
Markdown
210 lines
8.8 KiB
Markdown
# Go JOSE
|
|
|
|
[](https://godoc.org/gopkg.in/square/go-jose.v1) [](https://raw.githubusercontent.com/square/go-jose/master/LICENSE) [](https://travis-ci.org/square/go-jose) [](https://coveralls.io/r/square/go-jose)
|
|
|
|
Package jose aims to provide an implementation of the Javascript Object Signing
|
|
and Encryption set of standards. For the moment, it mainly focuses on encryption
|
|
and signing based on the JSON Web Encryption and JSON Web Signature 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)
|
|
standard (RFC 7516) and
|
|
[JSON Web Signature](http://dx.doi.org/10.17487/RFC7515)
|
|
standard (RFC 7515). 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/master/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. If you do not like this behavior, you can use the
|
|
`std_json` build tag to disable it (though we do not recommend doing so).
|
|
|
|
### Versions
|
|
|
|
We use [gopkg.in](https://gopkg.in) for versioning.
|
|
|
|
[Version 1](https://gopkg.in/square/go-jose.v1) is the current stable version:
|
|
|
|
import "gopkg.in/square/go-jose.v1"
|
|
|
|
The interface for [go-jose.v1](https://gopkg.in/square/go-jose.v1) will remain
|
|
backwards compatible. We're currently sketching out ideas for a new version, to
|
|
clean up the interface a bit. If you have ideas or feature requests [please let
|
|
us know](https://github.com/square/go-jose/issues/64)!
|
|
|
|
### 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](https://godoc.org/github.com/square/go-jose#pkg-constants)
|
|
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`. Note that if you are creating a new encrypter or signer with a
|
|
JsonWebKey, the key id of the JsonWebKey (if present) will be added to any
|
|
resulting messages.
|
|
|
|
Algorithm(s) | Corresponding types
|
|
:------------------------- | -------------------------------
|
|
RSA | *[rsa.PublicKey](http://golang.org/pkg/crypto/rsa/#PublicKey), *[rsa.PrivateKey](http://golang.org/pkg/crypto/rsa/#PrivateKey), *[jose.JsonWebKey](https://godoc.org/github.com/square/go-jose#JsonWebKey)
|
|
ECDH, ECDSA | *[ecdsa.PublicKey](http://golang.org/pkg/crypto/ecdsa/#PublicKey), *[ecdsa.PrivateKey](http://golang.org/pkg/crypto/ecdsa/#PrivateKey), *[jose.JsonWebKey](https://godoc.org/github.com/square/go-jose#JsonWebKey)
|
|
AES, HMAC | []byte, *[jose.JsonWebKey](https://godoc.org/github.com/square/go-jose#JsonWebKey)
|
|
|
|
## Examples
|
|
|
|
Encryption/decryption example using RSA:
|
|
|
|
```Go
|
|
// Generate a public/private key pair to use for this example. The library
|
|
// also provides two utility functions (LoadPublicKey and LoadPrivateKey)
|
|
// that can be used to load keys from PEM/DER-encoded data.
|
|
privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
// Instantiate an encrypter using RSA-OAEP with AES128-GCM. An error would
|
|
// indicate that the selected algorithm(s) are not currently supported.
|
|
publicKey := &privateKey.PublicKey
|
|
encrypter, err := NewEncrypter(RSA_OAEP, A128GCM, publicKey)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
// Encrypt a sample plaintext. Calling the encrypter returns an encrypted
|
|
// JWE object, which can then be serialized for output afterwards. An error
|
|
// would indicate a problem in an underlying cryptographic primitive.
|
|
var plaintext = []byte("Lorem ipsum dolor sit amet")
|
|
object, err := encrypter.Encrypt(plaintext)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
// Serialize the encrypted object using the full serialization format.
|
|
// Alternatively you can also use the compact format here by calling
|
|
// object.CompactSerialize() instead.
|
|
serialized := object.FullSerialize()
|
|
|
|
// Parse the serialized, encrypted JWE object. An error would indicate that
|
|
// the given input did not represent a valid message.
|
|
object, err = ParseEncrypted(serialized)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
// Now we can decrypt and get back our original plaintext. An error here
|
|
// would indicate the the message failed to decrypt, e.g. because the auth
|
|
// tag was broken or the message was tampered with.
|
|
decrypted, err := object.Decrypt(privateKey)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
fmt.Printf(string(decrypted))
|
|
// output: Lorem ipsum dolor sit amet
|
|
```
|
|
|
|
Signing/verification example using RSA:
|
|
|
|
```Go
|
|
// Generate a public/private key pair to use for this example. The library
|
|
// also provides two utility functions (LoadPublicKey and LoadPrivateKey)
|
|
// that can be used to load keys from PEM/DER-encoded data.
|
|
privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
// Instantiate a signer using RSASSA-PSS (SHA512) with the given private key.
|
|
signer, err := NewSigner(PS512, privateKey)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
// Sign a sample payload. Calling the signer returns a protected JWS object,
|
|
// which can then be serialized for output afterwards. An error would
|
|
// indicate a problem in an underlying cryptographic primitive.
|
|
var payload = []byte("Lorem ipsum dolor sit amet")
|
|
object, err := signer.Sign(payload)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
// Serialize the encrypted object using the full serialization format.
|
|
// Alternatively you can also use the compact format here by calling
|
|
// object.CompactSerialize() instead.
|
|
serialized := object.FullSerialize()
|
|
|
|
// Parse the serialized, protected JWS object. An error would indicate that
|
|
// the given input did not represent a valid message.
|
|
object, err = ParseSigned(serialized)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
// Now we can verify the signature on the payload. An error here would
|
|
// indicate the the message failed to verify, e.g. because the signature was
|
|
// broken or the message was tampered with.
|
|
output, err := object.Verify(&privateKey.PublicKey)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
fmt.Printf(string(output))
|
|
// output: Lorem ipsum dolor sit amet
|
|
```
|
|
|
|
More examples can be found in the [Godoc
|
|
reference](https://godoc.org/github.com/square/go-jose) for this package. The
|
|
[`jose-util`](https://github.com/square/go-jose/tree/master/jose-util)
|
|
subdirectory also contains a small command-line utility which might
|
|
be useful as an example.
|