Allow access to public and private keys

interfaces.go

@@ -1,6 +1,7 @@
 package mjwt
 
 import (
+	"crypto/rsa"
 	"github.com/golang-jwt/jwt/v4"
 	"time"
 )
@@ -12,9 +13,11 @@ type Signer interface {
 	GenerateJwt(sub, id string, aud jwt.ClaimStrings, dur time.Duration, claims Claims) (string, error)
 	SignJwt(claims jwt.Claims) (string, error)
 	Issuer() string
+	PrivateKey() *rsa.PrivateKey
 }
 
 // Verifier is used to verify the validity MJWT tokens and extract the claim values.
 type Verifier interface {
 	VerifyJwt(token string, claims baseTypeClaim) (*jwt.Token, error)
+	PublicKey() *rsa.PublicKey
 }

signer.go

@@ -18,6 +18,7 @@ type defaultMJwtSigner struct {
 }
 
 var _ Signer = &defaultMJwtSigner{}
+var _ Verifier = &defaultMJwtSigner{}
 
 // NewMJwtSigner creates a new defaultMJwtSigner using the issuer name and rsa.PrivateKey
 func NewMJwtSigner(issuer string, key *rsa.PrivateKey) Signer {
@@ -73,6 +74,9 @@ func (d *defaultMJwtSigner) VerifyJwt(token string, claims baseTypeClaim) (*jwt.
 	return d.verify.VerifyJwt(token, claims)
 }
 
+func (d *defaultMJwtSigner) PrivateKey() *rsa.PrivateKey { return d.key }
+func (d *defaultMJwtSigner) PublicKey() *rsa.PublicKey   { return d.verify.pub }
+
 // readOrCreatePrivateKey returns the private key it the file already exists,
 // generates a new private key and saves it to the file, or returns an error if
 // reading or generating failed.

verifier.go

@@ -57,3 +57,5 @@ func (d *defaultMJwtVerifier) VerifyJwt(token string, claims baseTypeClaim) (*jw
 	}
 	return withClaims, claims.Valid()
 }
+
+func (d *defaultMJwtVerifier) PublicKey() *rsa.PublicKey { return d.pub }