public key JWK -> bytes

[mistermoe]

Overview

• added function to convert secp256k1 public key jwk -> bytes
• added function to convert ed25519 public key jwk -> bytes
• added functions to convert public key jwk -> bytes to ecdsa, eddsa, and dsa

[!IMPORTANT] Adding this functionality for upcoming did:dht creation PR

Usage

High Level API

package main

import (
    "encoding/hex"
    "fmt"

    "github.com/tbd54566975/web5-go/crypto/dsa"
    "github.com/tbd54566975/web5-go/crypto/dsa/ecdsa"
    "github.com/tbd54566975/web5-go/jwk"
)

func main() {
    jwk := jwk.JWK{
        KTY: "EC",
        CRV: ecdsa.SECP256K1JWACurve,
        X:   "eb5mfvncu6xVoGKVzocLBwKb_NstzijZWfKBWxb4F5g",
        Y:   "SDradyajxGVdpPv8DhEIqP0XtEimhVQZnEfQj_sQ1Lg",
    }

    pubKeyBytes, err := dsa.PublicKeyToBytes(jwk)
    if err != nil {
        panic(err)
    }

    fmt.Println(hex.EncodeToString(pubKeyBytes))
}

Internal Dialogue

I really want to restructure the crypto package to be a bit cleaner. Specifically,

• pull secp256k1 and ed25519 up and into their own packages. These key types are applicable beyond DSA (e.g. ECDH)
• Potentially implement a registration pattern for the higher level APIs

[mistermoe]

@mihai-chiorean this should help convert JWKs to the format expected in did:dht DNS records