bootenv: move scope tests from secboot to bootenv

the mockPlatformHandler was copied over to the bootenv package and
all the test logic related to the new scope functionality was decoupled
from the outside keydata_test.go file.

bootenv/export_test.go

@@ -24,6 +24,7 @@ import (
 	"crypto"
 	"crypto/ecdsa"
 	"crypto/elliptic"
+	"crypto/rand"
 	"crypto/x509"
 	"errors"
 
@@ -146,3 +147,13 @@ func NewEcdsaPublicKey(rand []byte) (ecdsaPublicKey, error) {
 
 	return pk, nil
 }
+
+func NewPrimaryKey(sz1 int) (secboot.PrimaryKey, error) {
+	primaryKey := make(secboot.PrimaryKey, sz1)
+	_, err := rand.Read(primaryKey)
+	if err != nil {
+		return nil, err
+	}
+
+	return primaryKey, nil
+}