diff --git a/install.c b/install.c
new file mode 100644
index 0000000..0691120
--- /dev/null
+++ b/install.c
@@ -0,0 +1,186 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * 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
+ *
+ *      http://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.
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <sys/stat.h>
+
+#include "amend/amend.h"
+#include "common.h"
+#include "install.h"
+#include "mincrypt/rsa.h"
+#include "minui/minui.h"
+#include "minzip/SysUtil.h"
+#include "minzip/Zip.h"
+#include "mtdutils/mounts.h"
+#include "mtdutils/mtdutils.h"
+#include "roots.h"
+#include "verifier.h"
+
+/* List of public keys */
+static const RSAPublicKey keys[] = {
+#include "keys.inc"
+};
+
+#define ASSUMED_UPDATE_SCRIPT_NAME  "META-INF/com/google/android/update-script"
+
+static const ZipEntry *
+find_update_script(ZipArchive *zip)
+{
+//TODO: Get the location of this script from the MANIFEST.MF file
+    return mzFindZipEntry(zip, ASSUMED_UPDATE_SCRIPT_NAME);
+}
+
+static int read_data(ZipArchive *zip, const ZipEntry *entry,
+        char** ppData, int* pLength) {
+    int len = (int)mzGetZipEntryUncompLen(entry);
+    if (len <= 0) {
+        LOGE("Bad data length %d\n", len);
+        return -1;
+    }
+    char *data = malloc(len + 1);
+    if (data == NULL) {
+        LOGE("Can't allocate %d bytes for data\n", len + 1);
+        return -2;
+    }
+    bool ok = mzReadZipEntry(zip, entry, data, len);
+    if (!ok) {
+        LOGE("Error while reading data\n");
+        free(data);
+        return -3;
+    }
+    data[len] = '\0';     // not necessary, but just to be safe
+    *ppData = data;
+    if (pLength) {
+        *pLength = len;
+    }
+    return 0;
+}
+
+static int
+handle_update_script(ZipArchive *zip, const ZipEntry *update_script_entry)
+{
+    /* Read the entire script into a buffer.
+     */
+    int script_len;
+    char* script_data;
+    if (read_data(zip, update_script_entry, &script_data, &script_len) < 0) {
+        LOGE("Can't read update script\n");
+        return INSTALL_ERROR;
+    }
+
+    /* Parse the script.  Note that the script and parse tree are never freed.
+     */
+    const AmCommandList *commands = parseAmendScript(script_data, script_len);
+    if (commands == NULL) {
+        LOGE("Syntax error in update script\n");
+        return INSTALL_ERROR;
+    } else {
+        UnterminatedString name = mzGetZipEntryFileName(update_script_entry);
+        LOGI("Parsed %.*s\n", name.len, name.str);
+    }
+
+    /* Execute the script.
+     */
+    int ret = execCommandList((ExecContext *)1, commands);
+    if (ret != 0) {
+        int num = ret;
+        char *line, *next = script_data;
+        while (next != NULL && ret-- > 0) {
+            line = next;
+            next = memchr(line, '\n', script_data + script_len - line);
+            if (next != NULL) *next++ = '\0';
+        }
+        LOGE("Failure at line %d:\n%s\n", num, next ? line : "(not found)");
+        return INSTALL_ERROR;
+    }
+
+    ui_print("Installation complete.\n");
+    return INSTALL_SUCCESS;
+}
+
+static int
+handle_update_package(const char *path, ZipArchive *zip)
+{
+    // Give verification half the progress bar...
+    ui_print("Verifying update package...\n");
+    ui_show_progress(
+            VERIFICATION_PROGRESS_FRACTION,
+            VERIFICATION_PROGRESS_TIME);
+
+    if (!verify_jar_signature(zip, keys, sizeof(keys) / sizeof(keys[0]))) {
+        LOGE("Verification failed\n");
+        return INSTALL_CORRUPT;
+    }
+
+    // Update should take the rest of the progress bar.
+    ui_print("Installing update...\n");
+
+    const ZipEntry *script_entry;
+    script_entry = find_update_script(zip);
+    if (script_entry == NULL) {
+        LOGE("Can't find update script\n");
+        return INSTALL_CORRUPT;
+    }
+
+    if (register_package_root(zip, path) < 0) {
+        LOGE("Can't register package root\n");
+        return INSTALL_ERROR;
+    }
+
+    int ret = handle_update_script(zip, script_entry);
+    register_package_root(NULL, NULL);  // Unregister package root
+    return ret;
+}
+
+int
+install_package(const char *root_path)
+{
+    ui_set_background(BACKGROUND_ICON_INSTALLING);
+    ui_print("Finding update package...\n");
+    ui_show_indeterminate_progress();
+    LOGI("Update location: %s\n", root_path);
+
+    if (ensure_root_path_mounted(root_path) != 0) {
+        LOGE("Can't mount %s\n", root_path);
+        return INSTALL_CORRUPT;
+    }
+
+    char path[PATH_MAX] = "";
+    if (translate_root_path(root_path, path, sizeof(path)) == NULL) {
+        LOGE("Bad path %s\n", root_path);
+        return INSTALL_CORRUPT;
+    }
+
+    ui_print("Opening update package...\n");
+    LOGI("Update file path: %s\n", path);
+
+    /* Try to open the package.
+     */
+    ZipArchive zip;
+    int err = mzOpenZipArchive(path, &zip);
+    if (err != 0) {
+        LOGE("Can't open %s\n(%s)\n", path, err != -1 ? strerror(err) : "bad");
+        return INSTALL_CORRUPT;
+    }
+
+    /* Verify and install the contents of the package.
+     */
+    int status = handle_update_package(path, &zip);
+    mzCloseZipArchive(&zip);
+    return status;
+}