diff --git a/gmail/snippets/src/main/java/CreateSmimeInfo.java b/gmail/snippets/src/main/java/CreateSmimeInfo.java
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+++ b/gmail/snippets/src/main/java/CreateSmimeInfo.java
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+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+
+// [START gmail_create_smime_info]
+import com.google.api.services.gmail.model.SmimeInfo;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Base64;
+
+/* Class to demonstrate the use of Gmail Create SmimeInfo API */
+public class CreateSmimeInfo {
+    /**
+     * Create an SmimeInfo resource for a certificate from file.
+     *
+     * @param filename Name of the file containing the S/MIME certificate.
+     * @param password Password for the certificate file, or null if the file is not
+     *     password-protected.
+     * @return An SmimeInfo object with the specified certificate.
+     */
+    public static SmimeInfo createSmimeInfo(String filename, String password) {
+        SmimeInfo smimeInfo = null;
+        InputStream in = null;
+
+        try {
+            File file = new File(filename);
+            in = new FileInputStream(file);
+            byte[] fileContent = new byte[(int) file.length()];
+            in.read(fileContent);
+
+            smimeInfo = new SmimeInfo();
+            smimeInfo.setPkcs12(Base64.getUrlEncoder().encodeToString(fileContent));
+            if (password != null && password.length() > 0) {
+                smimeInfo.setEncryptedKeyPassword(password);
+            }
+        } catch (Exception e) {
+            System.out.printf("An error occured while reading the certificate file: %s\n", e);
+        } finally {
+            try {
+                if (in != null) {
+                    in.close();
+                }
+            } catch (IOException ioe) {
+                System.out.printf("An error occured while closing the input stream: %s\n", ioe);
+            }
+        }
+        return smimeInfo;
+    }
+}
+// [END gmail_create_smime_info]
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