diff --git a/pkg/kms/aws/service.go b/pkg/kms/aws/service.go
index 6e639d11b..4a84ee9db 100644
--- a/pkg/kms/aws/service.go
+++ b/pkg/kms/aws/service.go
@@ -91,6 +91,9 @@ var kmsKeyTypes = map[types.SigningAlgorithmSpec]arieskms.KeyType{
 // nolint: gochecknoglobals
 var keySpecToCurve = map[types.KeySpec]elliptic.Curve{
 	types.KeySpecEccSecgP256k1: btcec.S256(),
+	types.KeySpecEccNistP256:   elliptic.P256(),
+	types.KeySpecEccNistP384:   elliptic.P384(),
+	types.KeySpecEccNistP521:   elliptic.P521(),
 }
 
 const (
@@ -251,9 +254,10 @@ func (s *Service) Sign(msg []byte, kh interface{}) ([]byte, error) { //nolint: f
 		return nil, err
 	}
 
-	if describeKey.KeyMetadata.KeySpec == types.KeySpecEccSecgP256k1 {
+	if describeKey.KeyMetadata.KeySpec == types.KeySpecEccSecgP256k1 ||
+		describeKey.KeyMetadata.KeySpec == types.KeySpecEccNistP384 ||
+		describeKey.KeyMetadata.KeySpec == types.KeySpecEccNistP256 {
 		signature := ecdsaSignature{}
-
 		_, err = asn1.Unmarshal(result.Signature, &signature)
 		if err != nil {
 			return nil, err
diff --git a/pkg/kms/aws/service_test.go b/pkg/kms/aws/service_test.go
index 4228c6c30..7e64c45c1 100644
--- a/pkg/kms/aws/service_test.go
+++ b/pkg/kms/aws/service_test.go
@@ -63,10 +63,18 @@ func TestSign(t *testing.T) {
 				metric.EXPECT().SignCount()
 				metric.EXPECT().SignTime(gomock.Any())
 
+				sig := ecdsaSignature{
+					R: big.NewInt(12345),
+					S: big.NewInt(54321),
+				}
+
+				asnSig, err := asn1.Marshal(sig)
+				require.NoError(t, err)
+
 				client := NewMockawsClient(gomock.NewController(t))
 				client.EXPECT().Sign(gomock.Any(), gomock.Any(), gomock.Any()).
 					Return(&kms.SignOutput{
-						Signature: []byte("data"),
+						Signature: asnSig,
 					}, nil)
 
 				client.EXPECT().DescribeKey(gomock.Any(), gomock.Any(), gomock.Any()).
@@ -85,7 +93,7 @@ func TestSign(t *testing.T) {
 				signature, err := suiteSigner.Sign([]byte("msg"), wrapKID(
 					"aws-kms://arn:aws:kms:ca-central-1:111122223333:alias/800d5768-3fd7-4edd-a4b8-4c81c3e4c147"))
 				require.NoError(t, err)
-				require.Contains(t, string(signature), "data")
+				require.Contains(t, string(signature), "\xd41")
 			})
 		}
 	})