Update to support OEMCrypto v16 with ODK

common/ec_key_source.h

@@ -0,0 +1,43 @@
+////////////////////////////////////////////////////////////////////////////////
+// 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.
+////////////////////////////////////////////////////////////////////////////////
+//
+// Description:
+//   Declaration for abstract EC key generation class.
+
+#ifndef COMMON_EC_KEY_SOURCE_H_
+#define COMMON_EC_KEY_SOURCE_H_
+
+#include <string>
+
+#include "common/ec_key.h"
+
+namespace widevine {
+
+class ECKeySource {
+ public:
+  ECKeySource() = default;
+  virtual ~ECKeySource() = default;
+
+  // Get an EC key pair given a specific curve defined by EllipticCurve.
+  // Parameter |curve| is a standard curve which defines the parameters of the
+  // key generation.
+  // Parameter |private_key| is the serialized EC private key.
+  // Parameter |public_key| is the serialized EC public key.
+  // Caller retains ownership of all pointers and they cannot be nullptr.
+  // Returns true if successful, false otherwise.
+  virtual bool GetECKey(ECPrivateKey::EllipticCurve curve,
+                        std::string* private_key, std::string* public_key) = 0;
+
+ private:
+  ECKeySource(const ECKeySource&) = delete;
+  ECKeySource& operator=(const ECKeySource&) = delete;
+};
+
+}  // namespace widevine
+
+#endif  // COMMON_EC_KEY_SOURCE_H_