Adding encryption decryption feature

Signed-off-by: Tarun1 Gupta <gupttaru@deshaw.com>

test/utils/common_function_test.go

@@ -151,4 +151,20 @@ var _ = Describe("Common functions test", func() {
 		Entry("Docker not in cgroup file", "/tmp/cgroup.test", false, true, false),
 	)
 
+	It("Test WriteRSAKeyPair", func() {
+		fileName := "/tmp/test_key"
+		bitSize := 1024
+
+		publicKeyFileName, privateKeyFileName, err := WriteRSAKeyPair(fileName, bitSize)
+		Expect(err).To(BeNil(), "Failed to write RSA key pair to files.")
+
+		read, err := os.Open(publicKeyFileName)
+		Expect(err).To(BeNil(), "Cannot find the public key file after we write it.")
+		defer read.Close()
+
+		read, err = os.Open(privateKeyFileName)
+		Expect(err).To(BeNil(), "Cannot find the private key file after we write it.")
+		defer read.Close()
+	})
+
 })