ss

main.go

package main
import (
  "crypto/rand"
  "crypto/rsa"
  "encoding/json"
  "fmt"
  "log"
  jose "gopkg.in/square/go-jose.v2"
)
func main() {
  // For testing create the RSA key pair in the code
  privKey, err := rsa.GenerateKey(rand.Reader, 2048)
  if err != nil {
    log.Fatalf("generating random key: %v", err)
  }
  jwk := jose.JSONWebKey{
    Key:       &privKey.PublicKey,
    KeyID:     "myKeyID",
    Algorithm: "RS256",
  }
  b, err := json.Marshal(jwk)
  if err != nil {
    panic("error marshal " + err.Error())
  }
  fmt.Printf("%s\n\n", b)
  // create Square.jose signing key
  key := jose.SigningKey{Algorithm: jose.RS256, Key: privKey}
  // create a Square.jose RSA signer, used to sign the JWT
  var signerOpts = jose.SignerOptions{}
  signerOpts.WithType("JWT")
  signerOpts.WithHeader("KeyID", "myKeyID")
  rsaSigner, err := jose.NewSigner(key, &signerOpts)
  if err != nil {
    log.Fatalf("failed to create signer:%+v", err)
  }
  signature, err := rsaSigner.Sign([]byte("magic"))
  if err != nil {
    log.Fatal(err)
  }
  compactserialize, err := signature.CompactSerialize()
  if err != nil {
    log.Fatal(err)
  }
  fmt.Printf("signature %+v\n", compactserialize)
}