diff --git a/go.mod b/go.mod
index e7c4ac7..c56b831 100644
--- a/go.mod
+++ b/go.mod
@@ -5,7 +5,7 @@ go 1.16
 require (
 	github.com/anatol/vmtest v0.0.0-20210225191124-26540db15d49
 	github.com/fatih/color v1.12.0
-	github.com/foxboron/go-uefi v0.0.0-20210602193603-8589bbab9380
+	github.com/foxboron/go-uefi v0.0.0-20210611230104-7a6a29e36155
 	github.com/google/uuid v1.2.0
 	github.com/mattn/go-isatty v0.0.13 // indirect
 	github.com/spf13/cobra v1.1.3
diff --git a/go.sum b/go.sum
index 98e203d..45c8d24 100644
--- a/go.sum
+++ b/go.sum
@@ -43,6 +43,8 @@ github.com/fatih/color v1.12.0 h1:mRhaKNwANqRgUBGKmnI5ZxEk7QXmjQeCcuYFMX2bfcc=
 github.com/fatih/color v1.12.0/go.mod h1:ELkj/draVOlAH/xkhN6mQ50Qd0MPOk5AAr3maGEBuJM=
 github.com/foxboron/go-uefi v0.0.0-20210602193603-8589bbab9380 h1:D8hRHRCC/jFjOg0alhvQo2unG/HU/qZFbhLvRJPo21I=
 github.com/foxboron/go-uefi v0.0.0-20210602193603-8589bbab9380/go.mod h1:bLcrn48nYQOkijhTK2iQw1MjXbBqJTG0k8RP6ww+CGQ=
+github.com/foxboron/go-uefi v0.0.0-20210611230104-7a6a29e36155 h1:9RnTC3NVUwcFpHGGzDYd2LqED59D929P9rl+bq8JL2c=
+github.com/foxboron/go-uefi v0.0.0-20210611230104-7a6a29e36155/go.mod h1:bLcrn48nYQOkijhTK2iQw1MjXbBqJTG0k8RP6ww+CGQ=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
 github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
diff --git a/keys.go b/keys.go
index af2d14c..574d18f 100644
--- a/keys.go
+++ b/keys.go
@@ -99,7 +99,18 @@ func Enroll(uuid util.EFIGUID, cert, signerKey, signerPem []byte, efivar string)
 	c.AppendBytes(uuid, cert)
 	buf := new(bytes.Buffer)
 	signature.WriteSignatureList(buf, *c)
-	signedBuf := efi.SignEFIVariable(util.ReadKey(signerKey), util.ReadCert(signerPem), efivar, buf.Bytes())
+	key, err := util.ReadKey(signerKey)
+	if err != nil {
+		return nil
+	}
+	crt, err := util.ReadCert(signerPem)
+	if err != nil {
+		return nil
+	}
+	signedBuf, err := efi.SignEFIVariable(key, crt, efivar, buf.Bytes())
+	if err != nil {
+		return err
+	}
 	return efi.WriteEFIVariable(efivar, signedBuf)
 }
 
@@ -131,7 +142,10 @@ func VerifyFile(cert, file string) (bool, error) {
 		return false, err
 	}
 
-	x509Cert := util.ReadCertFromFile(cert)
+	x509Cert, err := util.ReadCertFromFile(cert)
+	if err != nil {
+		return false, err
+	}
 	sigs, err := pecoff.GetSignatures(peFile)
 	if err != nil {
 		return false, err
@@ -190,14 +204,26 @@ func SignFile(key, cert, file, output, checksum string) error {
 		return err
 	}
 
-	Cert := util.ReadCertFromFile(cert)
-	Key := util.ReadKeyFromFile(key)
+	Cert, err := util.ReadCertFromFile(cert)
+	if err != nil {
+		return err
+	}
+	Key, err := util.ReadKeyFromFile(key)
+	if err != nil {
+		return err
+	}
 
 	ctx := pecoff.PECOFFChecksum(peFile)
 
-	sig := pecoff.CreateSignature(ctx, Cert, Key)
+	sig, err := pecoff.CreateSignature(ctx, Cert, Key)
+	if err != nil {
+		return err
+	}
 
-	b := pecoff.AppendToBinary(ctx, sig)
+	b, err := pecoff.AppendToBinary(ctx, sig)
+	if err != nil {
+		return err
+	}
 	if err = os.WriteFile(file, b, si.Mode()); err != nil {
 		return err
 	}