Use correct methods when raising error during signing/verification wi…

…th EdDSA

lib/jwt/jwa/eddsa.rb

@@ -11,15 +11,15 @@ def initialize(alg)
 
       def sign(data:, signing_key:)
         unless signing_key.is_a?(RbNaCl::Signatures::Ed25519::SigningKey)
-          raise_encode_error!("Key given is a #{signing_key.class} but has to be an RbNaCl::Signatures::Ed25519::SigningKey")
+          raise_sign_error!("Key given is a #{signing_key.class} but has to be an RbNaCl::Signatures::Ed25519::SigningKey")
         end
 
         signing_key.sign(data)
       end
 
       def verify(data:, signature:, verification_key:)
         unless verification_key.is_a?(RbNaCl::Signatures::Ed25519::VerifyKey)
-          raise_decode_error!("key given is a #{verification_key.class} but has to be a RbNaCl::Signatures::Ed25519::VerifyKey")
+          raise_verify_error!("key given is a #{verification_key.class} but has to be a RbNaCl::Signatures::Ed25519::VerifyKey")
         end
 
         verification_key.verify(signature, data)

spec/jwt/jwa/eddsa_spec.rb

@@ -13,4 +13,20 @@
       expect(JWT::JWA::Eddsa.verify('RS256', key.verify_key, 'data', signature)).to be(true)
     end
   end
+
+  context 'when when signing with invalid RbNaCl::Signatures::Ed25519::SigningKey' do
+    it 'raises an error' do
+      expect do
+        JWT::JWA::Eddsa.sign('RS256', 'data', 'key')
+      end.to raise_error(JWT::EncodeError, 'Key given is a String but has to be an RbNaCl::Signatures::Ed25519::SigningKey')
+    end
+  end
+
+  context 'when when verifying with invalid RbNaCl::Signatures::Ed25519::VerifyKey' do
+    it 'raises an error' do
+      expect do
+        JWT::JWA::Eddsa.verify('RS256', 'key', 'data', 'signature')
+      end.to raise_error(JWT::DecodeError, 'key given is a String but has to be a RbNaCl::Signatures::Ed25519::VerifyKey')
+    end
+  end
 end