Use low-security scrypt KDF parameters for testing

src/cmds/restic/integration_test.go

@@ -40,6 +40,8 @@ func parseIDsFromReader(t testing.TB, rd io.Reader) backend.IDs {
 }
 
 func cmdInit(t testing.TB, global GlobalOptions) {
+	repository.TestUseLowSecurityKDFParameters(t)
+
 	cmd := &CmdInit{global: &global}
 	OK(t, cmd.Execute(nil))
 

src/restic/checker/checker_test.go

@@ -239,6 +239,8 @@ func induceError(data []byte) {
 func TestCheckerModifiedData(t *testing.T) {
 	be := mem.New()
 
+	repository.TestUseLowSecurityKDFParameters(t)
+
 	repo := repository.New(be)
 	OK(t, repo.Init(TestPassword))
 

src/restic/repository/testing.go

@@ -5,11 +5,25 @@ import (
 	"restic/backend"
 	"restic/backend/local"
 	"restic/backend/mem"
+	"restic/crypto"
 	"testing"
 
 	"github.com/restic/chunker"
 )
 
+// testKDFParams are the parameters for the KDF to be used during testing.
+var testKDFParams = crypto.KDFParams{
+	N: 128,
+	R: 1,
+	P: 1,
+}
+
+// TestUseLowSecurityKDFParameters configures low-security KDF parameters for testing.
+func TestUseLowSecurityKDFParameters(t testing.TB) {
+	t.Logf("using low-security KDF parameters for test")
+	KDFParams = &testKDFParams
+}
+
 // TestBackend returns a fully configured in-memory backend.
 func TestBackend(t testing.TB) (be backend.Backend, cleanup func()) {
 	return mem.New(), func() {}
@@ -22,8 +36,10 @@ const testChunkerPol = chunker.Pol(0x3DA3358B4DC173)
 
 // TestRepositoryWithBackend returns a repository initialized with a test
 // password. If be is nil, an in-memory backend is used. A constant polynomial
-// is used for the chunker.
+// is used for the chunker and low-security test parameters.
 func TestRepositoryWithBackend(t testing.TB, be backend.Backend) (r *Repository, cleanup func()) {
+	TestUseLowSecurityKDFParameters(t)
+
 	var beCleanup func()
 	if be == nil {
 		be, beCleanup = TestBackend(t)