diff --git a/pkg/tlsutil/tls.go b/pkg/tlsutil/tls.go
index c2cb284a6b1..5480cf1db64 100644
--- a/pkg/tlsutil/tls.go
+++ b/pkg/tlsutil/tls.go
@@ -152,7 +152,8 @@ func (scg *SDKCertGenerator) GenerateCert(cr runtime.Object, service *v1.Service
 	if err != nil {
 		return nil, nil, nil, err
 	}
-	appSecret, err := getAppSecretInCluster(scg.KubeClient, ToAppSecretName(k, n, config.CertName), ns)
+	appSecretName := ToAppSecretName(k, n, config.CertName)
+	appSecret, err := getAppSecretInCluster(scg.KubeClient, appSecretName, ns)
 	if err != nil {
 		return nil, nil, nil, err
 	}
@@ -169,9 +170,29 @@ func (scg *SDKCertGenerator) GenerateCert(cr runtime.Object, service *v1.Service
 	} else if hasAppSecret && !hasCASecretAndConfigMap {
 		return nil, nil, nil, ErrCANotFound
 	} else if !hasAppSecret && hasCASecretAndConfigMap {
-		// TODO
+		caKey, err := parsePEMEncodedPrivateKey(caSecret.Data[TLSPrivateCAKeyKey])
+		if err != nil {
+			return nil, nil, nil, err
+		}
+		caCert, err := parsePEMEncodedCert([]byte(caConfigMap.Data[TLSCACertKey]))
+		if err != nil {
+			return nil, nil, nil, err
+		}
+		key, err := newPrivateKey()
+		if err != nil {
+			return nil, nil, nil, err
+		}
+		cert, err := newSignedCertificate(config, service, key, caCert, caKey)
+		if err != nil {
+			return nil, nil, nil, err
+		}
+		appSecret, err := scg.KubeClient.CoreV1().Secrets(ns).Create(toTLSSecret(key, cert, appSecretName, ns))
+		if err != nil {
+			return nil, nil, nil, err
+		}
+		return appSecret, caConfigMap, caSecret, nil
 	} else {
-		// TODO
+		// TODO: handle the case where both CA and Application TLS assets don't exist.
 	}
 	return nil, nil, nil, nil
 }
diff --git a/test/e2e/testdata/ca-csr.json b/test/e2e/testdata/ca-csr.json
new file mode 100644
index 00000000000..6f13ed8d334
--- /dev/null
+++ b/test/e2e/testdata/ca-csr.json
@@ -0,0 +1,17 @@
+{
+    "key": {
+      "algo": "rsa",
+      "size": 2048
+    },
+    "names": [
+      {
+        "L": "San Francisco",
+        "ST": "California",
+        "C": "USA"
+      }
+    ],
+    "CN": "ca",
+    "ca": {
+      "expiry": "87600h"
+    }
+  }
diff --git a/test/e2e/testdata/ca.crt b/test/e2e/testdata/ca.crt
new file mode 100644
index 00000000000..015172df5dc
--- /dev/null
+++ b/test/e2e/testdata/ca.crt
@@ -0,0 +1,21 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/test/e2e/testdata/ca.csr b/test/e2e/testdata/ca.csr
new file mode 100644
index 00000000000..0a1c4abe607
--- /dev/null
+++ b/test/e2e/testdata/ca.csr
@@ -0,0 +1,16 @@
+-----BEGIN CERTIFICATE REQUEST-----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+-----END CERTIFICATE REQUEST-----
diff --git a/test/e2e/testdata/ca.key b/test/e2e/testdata/ca.key
new file mode 100644
index 00000000000..d170af1699e
--- /dev/null
+++ b/test/e2e/testdata/ca.key
@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEpAIBAAKCAQEA8Ep08kuesb00QTW5DTaGAXziTRs0jQrRf7tja2FEFvWDggnH
+roZfKuIPB+v/h01fUZUYkwGOw0hUmVCvwt8eLhYWNXpl484Kk2dfRShCsJFYaqO1
+0pBq6m9+1NL4HTtnshlqlbdoEudMDYpqOGdx3H7M4g7ahWacW/WbgolphqZ5Mfjb
+h/UKtiwR0nThyPh1sOxP/dWQGk5lv0APVvR78SjQvaZhRQUbXVg4xrx7E5qYD2dj
+3Hv43CekgGjvNilzNJLFuC5miuDk1DzfnNyjgwP4Emru+wzTRm540OgpMiijnyJx
+g1YaRue6fi7iG7e9uGwsZjUZL42MK6/nRC+EqQIDAQABAoIBAAbaSL2ENJFjEPNv
+IcjjriyqsBV82iHPlivrXyl3y6ZP+CEkQEKU6G/jpIQYUeA876P2+Y1vtO+Sx37b
+0zdef5DW5mk+BVvay2hqwUfKnyRD8N6RrqTDo5jt9xMAtTy4LfvhR63fXiNz3zJf
+qSnUoWWlZBhqTgcR5xGkTnwJiS3i0Vk9/xU1zNL7OZpSSSuefXuq2qQtG+Gayrps
+KAp1essnKnNRyiQH2yOn3pXs5Mj+ytWCV7C9eL1TAg0ZSIjuV+S/CNpCHsVLv5p6
+yj/CWjzV7NOhsdHoo5t1FsALhQaov0bb6hv96ZbTwkPoegr1SLQnYx63kOo//AmK
+uCgZgxECgYEA/qmFoBlRNm2AJ/vRp0t6JoERF9LhsUWSYRmcSho2xG5fLwzSxCjR
+YOxFEdZl3hzkH/rhY7+Vg6rOH5rhjL4hBKnrCkZcC88J7WCTI4mJDwTP/iViahAg
+RVEvJ6T51qI8N1wojumuQIhbUmVcWiZA49QRC/5DqIgZ1lRDWycqTeUCgYEA8Y2b
+mCI5zvjPci/1WBbPqA9ZDdbi4MmvO/RG+ik4RZnN7poxg2JU/Ta5RAFB1UY21bo8
+JTiL2pRqLaGLi0HPEJEaS6K5a+9oK5tUtmJp6CgpnNiNmALUyaoXbg3lrv5ajo74
+G94AZEIha0r9ReECvtk/sdsK1IgZaBtCIJ2Lj3UCgYEAjo+4DngdzqpeJAQEyfKm
+3wdB2mRjlCmuWE1OAO3L2wsundg/5TA0hl2+DM5JGJ5z1rNLmduWh68G1QqPWYrW
+URYOTiI1RScSF6EIvcwwvgejqFKlVVrRtfxMuZTRiCYqL5OX4OlQcy/ib63ulUj0
+6pW9NUmR9ra6QBHL4yt5s0ECgYEAsAJpX/+AdAnkzuWXNqrYgTM9xtHP28/aOiuT
+FHG4qS6bWcNNVNjv6NpZQO5RlCBnkHD1poF/lrQSclGGJuC7Cu1QZdCan8WA+FVk
+8sjfNuUc/UbmVd+qQZAJJo5F0K9SORKAQ34Odv+g7ldkGekNYRdYTDa5u4e4S52h
+H7bsnIkCgYAJZRkDWjhPhWX7hv9HcLcyW/yOe9tEys/2UoYBr+j3X0eraKR1+EUr
+Xli+yuPBbRo5+bEzAXI/gbZGu3J6vZm0J9qHc1ybqLvcTcOweTBU7xs4aeJsSK5O
+w0BnNOc/05hLf2Ow02ZlZBELMXpp1Y187+FKEmkwxTrgaGB3rZanVA==
+-----END RSA PRIVATE KEY-----
diff --git a/test/e2e/testdata/gencert.json b/test/e2e/testdata/gencert.json
new file mode 100644
index 00000000000..dcf31054818
--- /dev/null
+++ b/test/e2e/testdata/gencert.json
@@ -0,0 +1,13 @@
+{
+    "signing": {
+        "default": {
+            "usages": [
+            "signing",
+            "key encipherment",
+            "server auth",
+            "client auth"
+            ],
+            "expiry": "87600h"
+        }
+    }
+}
diff --git a/test/e2e/testdata/gencert.sh b/test/e2e/testdata/gencert.sh
new file mode 100755
index 00000000000..c81225618da
--- /dev/null
+++ b/test/e2e/testdata/gencert.sh
@@ -0,0 +1,18 @@
+#!/bin/bash
+
+if ! [[ "$0" =~ "./gencert.sh" ]]; then
+  echo "must be run from 'testdata'"
+  exit 255
+fi
+
+if ! which cfssl; then
+  echo "cfssl is not installed"
+  exit 255
+fi
+
+cfssl gencert --initca=true ./ca-csr.json | cfssljson --bare ca -
+mv ca.pem ca.crt
+mv ca-key.pem ca.key
+if which openssl >/dev/null; then
+  openssl x509 -in ca.crt -noout -text
+fi
diff --git a/test/e2e/tls_util_test.go b/test/e2e/tls_util_test.go
index 8d9584b8e0f..4490e258dcf 100644
--- a/test/e2e/tls_util_test.go
+++ b/test/e2e/tls_util_test.go
@@ -15,6 +15,7 @@
 package e2e
 
 import (
+	"io/ioutil"
 	"reflect"
 	"testing"
 
@@ -27,32 +28,53 @@ import (
 
 var (
 	// TLS test variables.
-	crKind   = "Pod"
-	crName   = "example-pod"
-	certName = "app-cert"
-
+	crKind                   = "Pod"
+	crName                   = "example-pod"
+	certName                 = "app-cert"
 	caConfigMapAndSecretName = tlsutil.ToCASecretAndConfigMapName(crKind, crName)
-	caConfigMap              = &v1.ConfigMap{
+	appSecretName            = tlsutil.ToAppSecretName(crKind, crName, certName)
+
+	caConfigMap *v1.ConfigMap
+	caSecret    *v1.Secret
+	appSecret   *v1.Secret
+
+	ccfg *tlsutil.CertConfig
+)
+
+// setup test variables.
+func init() {
+	caCertBytes, err := ioutil.ReadFile("./testdata/ca.crt")
+	if err != nil {
+		panic(err)
+	}
+	caConfigMap = &v1.ConfigMap{
 		ObjectMeta: metav1.ObjectMeta{
 			Name: caConfigMapAndSecretName,
 		},
+		Data: map[string]string{tlsutil.TLSCACertKey: string(caCertBytes)},
+	}
+
+	caKeyBytes, err := ioutil.ReadFile("./testdata/ca.key")
+	if err != nil {
+		panic(err)
 	}
 	caSecret = &v1.Secret{
 		ObjectMeta: metav1.ObjectMeta{
 			Name: caConfigMapAndSecretName,
 		},
+		Data: map[string][]byte{tlsutil.TLSPrivateCAKeyKey: caKeyBytes},
 	}
 
 	appSecret = &v1.Secret{
 		ObjectMeta: metav1.ObjectMeta{
-			Name: tlsutil.ToAppSecretName(crKind, crName, certName),
+			Name: appSecretName,
 		},
 	}
 
 	ccfg = &tlsutil.CertConfig{
 		CertName: certName,
 	}
-)
+}
 
 // TestBothAppAndCATLSAssetsExist ensures that when both application
 // and CA TLS assets exist in the k8s cluster for a given cr,
@@ -142,3 +164,73 @@ func TestOnlyAppSecretExist(t *testing.T) {
 		t.Fatalf("expect %v, but got %v", tlsutil.ErrCANotFound.Error(), err.Error())
 	}
 }
+
+// TestOnlyCAExist ensures that at the case where only the CA exists in the cluster;
+// GenerateCert can retrieve the CA and uses it to create a new application secret.
+func TestOnlyCAExist(t *testing.T) {
+	f := framework.Global
+	ctx := f.NewTestCtx(t)
+	defer ctx.Cleanup(t)
+	namespace, err := ctx.GetNamespace()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_, err = f.KubeClient.CoreV1().ConfigMaps(namespace).Create(caConfigMap)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, err = f.KubeClient.CoreV1().Secrets(namespace).Create(caSecret)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	cg := tlsutil.NewSDKCertGenerator(f.KubeClient)
+	// Use Pod as a dummy runtime object for the CR input of GenerateCert().
+	mCR := &v1.Pod{
+		TypeMeta: metav1.TypeMeta{
+			Kind: crKind,
+		},
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      crName,
+			Namespace: namespace,
+		},
+	}
+	appSvc := &v1.Service{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      "app-service",
+			Namespace: namespace,
+		},
+	}
+	appSecret, _, _, err := cg.GenerateCert(mCR, appSvc, ccfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// check if appSecret has the correct fields.
+	if appSecretName != appSecret.Name {
+		t.Fatalf("expect the secret name %v, but got %v", appSecretName, appSecret.Name)
+	}
+	if namespace != appSecret.Namespace {
+		t.Fatalf("expect the secret namespace %v, but got %v", namespace, appSecret.Namespace)
+	}
+	if v1.SecretTypeTLS != appSecret.Type {
+		t.Fatalf("expect the secret type %v, but got %v", v1.SecretTypeTLS, appSecret.Type)
+	}
+	if _, ok := appSecret.Data[v1.TLSCertKey]; !ok {
+		t.Fatalf("expect the secret to have the data field %v, but got none", v1.TLSCertKey)
+	}
+	if _, ok := appSecret.Data[v1.TLSPrivateKeyKey]; !ok {
+		t.Fatalf("expect the secret to have the data field %v, but got none", v1.TLSPrivateKeyKey)
+	}
+
+	// check if appSecret exists in k8s cluster.
+	appSecretFromCluster, err := f.KubeClient.CoreV1().Secrets(namespace).Get(appSecretName, metav1.GetOptions{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	// check if appSecret returned from GenerateCert is the same as the one that exists in the k8s.
+	if !reflect.DeepEqual(appSecret, appSecretFromCluster) {
+		t.Fatalf("expect %+v, but got %+v", appSecret, appSecretFromCluster)
+	}
+}