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SD-JWT lib as a separate module (#369)
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* SD-JWT lib as a separate module

* Readme with explanation and make it readable.

* No ptr.

* Fixing the build

---------

Co-authored-by: Gabe <[email protected]>
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andresuribe87 and decentralgabe authored May 10, 2023
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6 changes: 6 additions & 0 deletions go.work
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go 1.20

use (
./sd-jwt
.
)
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gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
nhooyr.io/websocket v1.8.3/go.mod h1:LiqdCg1Cu7TPWxEvPjPa0TGYxCsy4pHNTN9gGluwBpQ=
60 changes: 60 additions & 0 deletions sd-jwt/README.md
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[![godoc ssi-sdk](https://img.shields.io/badge/godoc-ssi--sdk-blue)](https://pkg.go.dev/github.com/TBD54566975/ssi-sdk/sd-jwt)
[![go version 1.20.3](https://img.shields.io/badge/go_version-1.20.4-brightgreen)](https://golang.org/)
[![Go Report Card A+](https://goreportcard.com/badge/github.com/TBD54566975/ssi-sdk/sd-jwt)](https://goreportcard.com/report/github.com/TBD54566975/ssi-sdk/sd-jwt)
[![license Apache 2](https://img.shields.io/badge/license-Apache%202-black)](https://github.com/TBD54566975/ssi-sdk/blob/main/LICENSE)

# SD-JWT support in golang

`sd-jwt` is a library that implements the IETF draft for [Selective Disclosure for JWTs](https://www.ietf.org/archive/id/draft-ietf-oauth-selective-disclosure-jwt-04.html).
This library facilitates creating combined formats for issuance and presentation with arbitrary payloads, and performing
verification from the holder or from the verifiers perspective.

## Table of Contents
- [Installation](#installation)
- [Quick Start](#quick-start)
- [Usage](#usage)
- [API Reference](#api-reference)
- [Configuration](#configuration)
- [Contributing](#contributing)
- [Building](#building)

## Installation

To install `sd-jwt`, use `go get`:

```bash
go get github.com/TBD54566975/ssi-sdk/sd-jwt
```

## Quick Start
See [this example](example/main.go).

You can run it by cloning this repo, changing directory into this directory, and running a go application.
See the terminal command below.

```shell
git clone github.com/TBD54566975/ssi-sdk.git
cd ssi-sdk/sd-jwt
go run example.main.go
```

## Usage
The best usage examples can be found in the [sd_jwt_test.go](sd_jwt_test.go) file.

## API Reference
See our [oficial godocs](https://pkg.go.dev/github.com/TBD54566975/ssi-sdk/sd-jwt).

## Configuration
Configuration is done via dependency injection on the `SDJWTSigner` struct.

If you want to inject your own implementation of JWT signatures, you can pass it by implementing a struct that satisfies
the `Signer` interface.

If you want to inject your own random number generator, you can pass it by implementation the `SaltGenerator` interface.
We provide a default one which relies on `crypto/rand`, which you can instantiate by calling `NewSaltGenerator`.

## Building
See the [SDK Building](../README.md#building) section.

## Contributing
See the general [CONTRIBUTING](../CONTRIBUTING.md) guide.
65 changes: 65 additions & 0 deletions sd-jwt/example/main.go
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package main

import (
"fmt"

sdjwt "ssi-sdk/sd-jwt"

"github.com/TBD54566975/ssi-sdk/crypto"
"github.com/TBD54566975/ssi-sdk/crypto/jwx"
"github.com/TBD54566975/ssi-sdk/did/key"
"github.com/lestrrat-go/jwx/v2/jwa"
"github.com/lestrrat-go/jwx/v2/jwt"
)

// Create a struct that implements sd_jwt.Signer. Here we use the lestrat-go/jwx library to sign arbitrary payloads.
type lestratSigner struct {
signer jwx.Signer
}

func (s lestratSigner) Sign(blindedClaimsData []byte) ([]byte, error) {
insecureSDJWT, err := jwt.ParseInsecure(blindedClaimsData)
if err != nil {
return nil, err
}

signed, err := jwt.Sign(insecureSDJWT, jwt.WithKey(jwa.KeyAlgorithmFrom(s.signer.ALG), s.signer.PrivateKey))
if err != nil {
return nil, err
}
return signed, nil
}

func main() {
issuerPrivKey, issuerDID, _ := key.GenerateDIDKey(crypto.P256)
expandedIssuerDID, _ := issuerDID.Expand()
issuerKID := expandedIssuerDID.VerificationMethod[0].ID

issuerSigner, _ := jwx.NewJWXSigner(issuerDID.String(), issuerKID, issuerPrivKey)
signer := sdjwt.NewSDJWTSigner(&lestratSigner{
*issuerSigner,
}, sdjwt.NewSaltGenerator(16))
issuanceFormat, _ := signer.BlindAndSign([]byte(`{"firstName":"Alice"}`), map[string]sdjwt.BlindOption{
"firstName": sdjwt.RecursiveBlindOption{},
})

// Prints something like the following
// eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCJ9.eyJfc2QiOlsiNzZRT2p6M3FackdsaUpBSEN2RmR5M1E3dFNuVnU5bEZRU0syejJZQVg3dyIsIm5LZWlQSUdTSkd1cG1TM09rckM2M2pVbkVYMml5R1JxV1VnNklJeUc1TEEiXSwiX3NkX2FsZyI6InNoYS0yNTYifQ.tBVz1_ilURbGQxqpEqKTlJb25-i6VbdBdy_7dqmLAU1Z8Rl98UgYTQfaTgaGNRyv-lIWj5uk57mWz-qkwndurw~WyJqQjZIN2QxdnVGWFp1NTFLZ1ZWQjdRIiwgImZpcnN0TmFtZSIsICJBbGljZSJd
//
// The payload of the JWT piece is similar to the one below.
// {
// "_sd": [
// "76QOjz3qZrGliJAHCvFdy3Q7tSnVu9lFQSK2z2YAX7w",
// "nKeiPIGSJGupmS3OkrC63jUnEX2iyGRqWUg6IIyG5LA"
// ],
// "_sd_alg": "sha-256"
// }
//
// The base64url decoded value of the disclosure is similar to the one below
// [
// "jB6H7d1vuFXZu51KgVVB7Q",
// "firstName",
// "Alice"
// ]
fmt.Println(string(issuanceFormat)) // Prints an SD-JWT with a single disclosure.
}
50 changes: 50 additions & 0 deletions sd-jwt/go.mod
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module ssi-sdk/sd-jwt

go 1.20

replace github.com/TBD54566975/ssi-sdk v0.0.3-alpha => ../../ssi-sdk

require (
github.com/TBD54566975/ssi-sdk v0.0.3-alpha
github.com/goccy/go-json v0.10.2
github.com/lestrrat-go/jwx/v2 v2.0.9-0.20230429214153-5090ec1bd2cd
github.com/pkg/errors v0.9.1
github.com/stretchr/testify v1.8.2
)

require (
github.com/btcsuite/btcd/btcec/v2 v2.3.2 // indirect
github.com/cloudflare/circl v1.3.3 // indirect
github.com/davecgh/go-spew v1.1.1 // indirect
github.com/decred/dcrd/dcrec/secp256k1/v4 v4.2.0 // indirect
github.com/go-playground/locales v0.14.1 // indirect
github.com/go-playground/universal-translator v0.18.1 // indirect
github.com/go-playground/validator/v10 v10.13.0 // indirect
github.com/google/uuid v1.3.0 // indirect
github.com/hyperledger/aries-framework-go v0.3.1 // indirect
github.com/hyperledger/aries-framework-go/component/kmscrypto v0.0.0-20230427134832-0c9969493bd3 // indirect
github.com/hyperledger/aries-framework-go/component/log v0.0.0-20230427134832-0c9969493bd3 // indirect
github.com/hyperledger/aries-framework-go/component/models v0.0.0-20230501135648-a9a7ad029347 // indirect
github.com/hyperledger/aries-framework-go/spi v0.0.0-20230427134832-0c9969493bd3 // indirect
github.com/kilic/bls12-381 v0.1.1-0.20210503002446-7b7597926c69 // indirect
github.com/leodido/go-urn v1.2.3 // indirect
github.com/lestrrat-go/blackmagic v1.0.1 // indirect
github.com/lestrrat-go/httpcc v1.0.1 // indirect
github.com/lestrrat-go/httprc v1.0.4 // indirect
github.com/lestrrat-go/iter v1.0.2 // indirect
github.com/lestrrat-go/option v1.0.1 // indirect
github.com/mr-tron/base58 v1.2.0 // indirect
github.com/multiformats/go-base32 v0.1.0 // indirect
github.com/multiformats/go-base36 v0.1.0 // indirect
github.com/multiformats/go-multibase v0.2.0 // indirect
github.com/multiformats/go-multicodec v0.9.0 // indirect
github.com/multiformats/go-varint v0.0.7 // indirect
github.com/piprate/json-gold v0.5.0 // indirect
github.com/pmezard/go-difflib v1.0.0 // indirect
github.com/pquerna/cachecontrol v0.1.0 // indirect
github.com/sirupsen/logrus v1.9.0 // indirect
golang.org/x/crypto v0.8.0 // indirect
golang.org/x/sys v0.8.0 // indirect
golang.org/x/text v0.9.0 // indirect
gopkg.in/yaml.v3 v3.0.1 // indirect
)
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