Scope the ECDSA constant sizes to CPubKey / CKey classes

src/key.h

@@ -16,16 +16,6 @@
 #include <vector>
 
 
-/**
- * secp256k1:
- */
-const unsigned int PRIVATE_KEY_SIZE            = 279;
-const unsigned int COMPRESSED_PRIVATE_KEY_SIZE = 214;
-/**
- * see www.keylength.com
- * script supports up to 75 for single byte push
- */
-
 /**
  * secure_allocator is defined in allocators.h
  * CPrivKey is a serialized private key, with all parameters included
@@ -36,6 +26,20 @@ typedef std::vector<unsigned char, secure_allocator<unsigned char> > CPrivKey;
 /** An encapsulated private key. */
 class CKey
 {
+public:
+    /**
+     * secp256k1:
+     */
+    static const unsigned int PRIVATE_KEY_SIZE            = 279;
+    static const unsigned int COMPRESSED_PRIVATE_KEY_SIZE = 214;
+    /**
+     * see www.keylength.com
+     * script supports up to 75 for single byte push
+     */
+    static_assert(
+        PRIVATE_KEY_SIZE >= COMPRESSED_PRIVATE_KEY_SIZE,
+        "COMPRESSED_PRIVATE_KEY_SIZE is larger than PRIVATE_KEY_SIZE");
+
 private:
     //! Whether this private key is valid. We check for correctness when modifying the key
     //! data, so fValid should always correspond to the actual state.