Replace hardcoded parameters

common/signer_public_key.h

@@ -0,0 +1,40 @@
+////////////////////////////////////////////////////////////////////////////////
+// Copyright 2019 Google LLC.
+//
+// This software is licensed under the terms defined in the Widevine Master
+// License Agreement. For a copy of this agreement, please contact
+// widevine-licensing@google.com.
+////////////////////////////////////////////////////////////////////////////////
+
+#ifndef COMMON_SIGNER_PUBLIC_KEY_H_
+#define COMMON_SIGNER_PUBLIC_KEY_H_
+
+#include <string>
+
+#include "protos/public/drm_certificate.pb.h"
+
+namespace widevine {
+
+// SignerPublicKey is implemented for each provisioning key type that are
+// defined in video/widevine/proto/public.drm_certificate.proto.
+class SignerPublicKey {
+ public:
+  SignerPublicKey() = default;
+  virtual ~SignerPublicKey() = default;
+  SignerPublicKey(const SignerPublicKey&) = delete;
+  SignerPublicKey& operator=(const SignerPublicKey&) = delete;
+
+  // Verify message using |signer_public_key_|.
+  virtual bool VerifySignature(const std::string& message,
+                               const std::string& signature) const = 0;
+
+  // A factory method to create a SignerPublicKey. The |algorithm| is used to
+  // create an appropriate SignerPublicKey for the key type.
+  // The returned pointer is a nullptr if the key cannot be deserialized.
+  static std::unique_ptr<SignerPublicKey> Create(
+      const std::string& signer_public_key,
+      DrmCertificate::Algorithm algorithm);
+};
+
+}  // namespace widevine
+#endif  // COMMON_SIGNER_PUBLIC_KEY_H_