snapshot of https://github.com/ory/keto.git (master, 2026-09-16; blobs > 131072B omitted)

oryx/josex/public.go

@@ -0,0 +1,29 @@
+package josex
+
+import (
+	"crypto"
+
+	"github.com/go-jose/go-jose/v3"
+)
+
+// ToPublicKey returns the public key of the given private key.
+func ToPublicKey(k *jose.JSONWebKey) jose.JSONWebKey {
+	if key := k.Public(); key.Key != nil {
+		return key
+	}
+
+	// HSM workaround - jose does not understand crypto.Signer / HSM so we need to manually
+	// extract the public key.
+	switch key := k.Key.(type) {
+	case crypto.Signer:
+		newKey := *k
+		newKey.Key = key.Public()
+		return newKey
+	case jose.OpaqueSigner:
+		newKey := *k
+		newKey.Key = key.Public().Key
+		return newKey
+	}
+
+	return jose.JSONWebKey{}
+}