Address pull request comments

* Allocate with composite literal instead of new
* Remove check of number of bytes read from rand

crypto/key_store_passphrase.go

@@ -89,8 +89,9 @@ type keyStorePassphrase struct {
 }
 
 func NewKeyStorePassphrase(path string) KeyStore2 {
-	ks := new(keyStorePassphrase)
-	ks.keysDirPath = path
+	ks := &keyStorePassphrase{
+		keysDirPath : path,
+	}
 	return ks
 }
 
@@ -103,9 +104,10 @@ func (ks keyStorePassphrase) GetKey(keyId *uuid.UUID, auth string) (key *Key, er
 	if err != nil {
 		return nil, err
 	}
-	key = new(Key)
-	key.Id = keyId
-	key.PrivateKey = ToECDSA(keyBytes)
+	key = &Key{
+		Id : keyId,
+		PrivateKey : ToECDSA(keyBytes),
+	}
 	return key, err
 }