.

vendor/github.com/MicahParks/keyfunc/v2/eddsa.go

@@ -0,0 +1,29 @@
+package keyfunc
+
+import (
+	"crypto/ed25519"
+	"fmt"
+)
+
+const (
+	// ktyEC is the key type (kty) in the JWT header for EdDSA.
+	ktyOKP = "OKP"
+)
+
+// EdDSA parses a jsonWebKey and turns it into a EdDSA public key.
+func (j *jsonWebKey) EdDSA() (publicKey ed25519.PublicKey, err error) {
+	if j.X == "" {
+		return nil, fmt.Errorf("%w: %s", ErrMissingAssets, ktyOKP)
+	}
+
+	// Decode the public key from Base64.
+	//
+	// According to RFC 8037, this is from Base64 URL bytes.
+	// https://datatracker.ietf.org/doc/html/rfc8037#appendix-A.2
+	publicBytes, err := base64urlTrailingPadding(j.X)
+	if err != nil {
+		return nil, err
+	}
+
+	return publicBytes, nil
+}