Snap for 5067452 from a5a1b7544a to qt-release

Change-Id: Id9d95f3280a427b0e5527348c726207347fba09c

fsck_unshare_blocks.cpp

@@ -40,6 +40,7 @@
 
 static constexpr const char* SYSTEM_E2FSCK_BIN = "/system/bin/e2fsck_static";
 static constexpr const char* TMP_E2FSCK_BIN = "/tmp/e2fsck.bin";
+static constexpr const char* SYSTEM_ROOT = "/system";
 
 static bool copy_file(const char* source, const char* dest) {
   android::base::unique_fd source_fd(open(source, O_RDONLY));
@@ -121,12 +122,12 @@ bool do_fsck_unshare_blocks() {
 
   // Temporarily mount system so we can copy e2fsck_static.
   bool mounted = false;
-  if (android::base::GetBoolProperty("ro.build.system_root_image", false)) {
+  if (volume_for_mount_point(SYSTEM_ROOT) == nullptr) {
     mounted = ensure_path_mounted_at("/", "/mnt/system") != -1;
     partitions.push_back("/");
   } else {
-    mounted = ensure_path_mounted_at("/system", "/mnt/system") != -1;
-    partitions.push_back("/system");
+    mounted = ensure_path_mounted_at(SYSTEM_ROOT, "/mnt/system") != -1;
+    partitions.push_back(SYSTEM_ROOT);
   }
   if (!mounted) {
     LOG(ERROR) << "Failed to mount system image.";

recovery.cpp

@@ -78,6 +78,7 @@ static constexpr const char* CACHE_ROOT = "/cache";
 static constexpr const char* DATA_ROOT = "/data";
 static constexpr const char* METADATA_ROOT = "/metadata";
 static constexpr const char* SDCARD_ROOT = "/sdcard";
+static constexpr const char* SYSTEM_ROOT = "/system";
 
 // We define RECOVERY_API_VERSION in Android.mk, which will be picked up by build system and packed
 // into target_files.zip. Assert the version defined in code and in Android.mk are consistent.
@@ -852,12 +853,12 @@ static Device::BuiltinAction prompt_and_wait(Device* device, int status) {
       }
       case Device::MOUNT_SYSTEM:
         // the system partition is mounted at /mnt/system
-        if (android::base::GetBoolProperty("ro.build.system_root_image", false)) {
+        if (volume_for_mount_point(SYSTEM_ROOT) == nullptr) {
           if (ensure_path_mounted_at("/", "/mnt/system") != -1) {
             ui->Print("Mounted /system.\n");
           }
         } else {
-          if (ensure_path_mounted_at("/system", "/mnt/system") != -1) {
+          if (ensure_path_mounted_at(SYSTEM_ROOT, "/mnt/system") != -1) {
             ui->Print("Mounted /system.\n");
           }
         }

tests/component/verifier_test.cpp

@@ -27,6 +27,7 @@
 #include <android-base/file.h>
 #include <android-base/stringprintf.h>
 #include <android-base/test_utils.h>
+#include <android-base/unique_fd.h>
 #include <gtest/gtest.h>
 
 #include "common/test_constants.h"
@@ -35,6 +36,89 @@
 
 using namespace std::string_literals;
 
+static void LoadKeyFromFile(const std::string& file_name, Certificate* cert) {
+  std::string testkey_string;
+  ASSERT_TRUE(android::base::ReadFileToString(file_name, &testkey_string));
+  ASSERT_TRUE(LoadCertificateFromBuffer(
+      std::vector<uint8_t>(testkey_string.begin(), testkey_string.end()), cert));
+}
+
+static void VerifyPackageWithCertificate(const std::string& name, Certificate&& cert) {
+  std::string package = from_testdata_base(name);
+  MemMapping memmap;
+  if (!memmap.MapFile(package)) {
+    FAIL() << "Failed to mmap " << package << ": " << strerror(errno) << "\n";
+  }
+
+  std::vector<Certificate> certs;
+  certs.emplace_back(std::move(cert));
+  ASSERT_EQ(VERIFY_SUCCESS, verify_file(memmap.addr, memmap.length, certs));
+}
+
+TEST(VerifierTest, LoadCertificateFromBuffer_failure) {
+  Certificate cert(0, Certificate::KEY_TYPE_RSA, nullptr, nullptr);
+  std::string testkey_string;
+  ASSERT_TRUE(
+      android::base::ReadFileToString(from_testdata_base("testkey_v1.txt"), &testkey_string));
+  ASSERT_FALSE(LoadCertificateFromBuffer(
+      std::vector<uint8_t>(testkey_string.begin(), testkey_string.end()), &cert));
+}
+
+TEST(VerifierTest, LoadCertificateFromBuffer_sha1_exponent3) {
+  Certificate cert(0, Certificate::KEY_TYPE_RSA, nullptr, nullptr);
+  LoadKeyFromFile(from_testdata_base("testkey_v1.x509.pem"), &cert);
+
+  ASSERT_EQ(SHA_DIGEST_LENGTH, cert.hash_len);
+  ASSERT_EQ(Certificate::KEY_TYPE_RSA, cert.key_type);
+  ASSERT_EQ(nullptr, cert.ec);
+
+  VerifyPackageWithCertificate("otasigned_v1.zip", std::move(cert));
+}
+
+TEST(VerifierTest, LoadCertificateFromBuffer_sha1_exponent65537) {
+  Certificate cert(0, Certificate::KEY_TYPE_RSA, nullptr, nullptr);
+  LoadKeyFromFile(from_testdata_base("testkey_v2.x509.pem"), &cert);
+
+  ASSERT_EQ(SHA_DIGEST_LENGTH, cert.hash_len);
+  ASSERT_EQ(Certificate::KEY_TYPE_RSA, cert.key_type);
+  ASSERT_EQ(nullptr, cert.ec);
+
+  VerifyPackageWithCertificate("otasigned_v2.zip", std::move(cert));
+}
+
+TEST(VerifierTest, LoadCertificateFromBuffer_sha256_exponent3) {
+  Certificate cert(0, Certificate::KEY_TYPE_RSA, nullptr, nullptr);
+  LoadKeyFromFile(from_testdata_base("testkey_v3.x509.pem"), &cert);
+
+  ASSERT_EQ(SHA256_DIGEST_LENGTH, cert.hash_len);
+  ASSERT_EQ(Certificate::KEY_TYPE_RSA, cert.key_type);
+  ASSERT_EQ(nullptr, cert.ec);
+
+  VerifyPackageWithCertificate("otasigned_v3.zip", std::move(cert));
+}
+
+TEST(VerifierTest, LoadCertificateFromBuffer_sha256_exponent65537) {
+  Certificate cert(0, Certificate::KEY_TYPE_RSA, nullptr, nullptr);
+  LoadKeyFromFile(from_testdata_base("testkey_v4.x509.pem"), &cert);
+
+  ASSERT_EQ(SHA256_DIGEST_LENGTH, cert.hash_len);
+  ASSERT_EQ(Certificate::KEY_TYPE_RSA, cert.key_type);
+  ASSERT_EQ(nullptr, cert.ec);
+
+  VerifyPackageWithCertificate("otasigned_v4.zip", std::move(cert));
+}
+
+TEST(VerifierTest, LoadCertificateFromBuffer_sha256_ec256bits) {
+  Certificate cert(0, Certificate::KEY_TYPE_RSA, nullptr, nullptr);
+  LoadKeyFromFile(from_testdata_base("testkey_v5.x509.pem"), &cert);
+
+  ASSERT_EQ(SHA256_DIGEST_LENGTH, cert.hash_len);
+  ASSERT_EQ(Certificate::KEY_TYPE_EC, cert.key_type);
+  ASSERT_EQ(nullptr, cert.rsa);
+
+  VerifyPackageWithCertificate("otasigned_v5.zip", std::move(cert));
+}
+
 class VerifierTest : public testing::TestWithParam<std::vector<std::string>> {
  protected:
   void SetUp() override {

tools/image_generator/Android.bp

@@ -0,0 +1,23 @@
+// Copyright (C) 2018 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.
+
+java_library_host {
+    name: "RecoveryImageGenerator",
+
+    manifest: "ImageGenerator.mf",
+
+    srcs: [
+        "ImageGenerator.java",
+    ],
+}

tools/image_generator/ImageGenerator.java

@@ -0,0 +1,394 @@
+/*
+ * Copyright (C) 2018 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.
+ */
+
+package com.android.recovery.tools;
+
+import java.awt.Color;
+import java.awt.Font;
+import java.awt.FontFormatException;
+import java.awt.FontMetrics;
+import java.awt.Graphics2D;
+import java.awt.RenderingHints;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.TreeMap;
+import java.util.StringTokenizer;
+
+import javax.imageio.ImageIO;
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.parsers.ParserConfigurationException;
+
+import org.w3c.dom.Document;
+import org.w3c.dom.Node;
+import org.w3c.dom.NodeList;
+
+/**
+ * Command line tool to generate the localized image for recovery mode.
+ */
+public class ImageGenerator {
+  // Initial height of the image to draw.
+  private static final int INITIAL_HEIGHT = 20000;
+
+  private static final float DEFAULT_FONT_SIZE = 40;
+
+  // This is the canvas we used to draw texts.
+  private BufferedImage mBufferedImage;
+
+  // The width in pixels of our image. Once set, its value won't change.
+  private final int mImageWidth;
+
+  // The current height in pixels of our image. We will adjust the value when drawing more texts.
+  private int mImageHeight;
+
+  // The current vertical offset in pixels to draw the top edge of new text strings.
+  private int mVerticalOffset;
+
+  // The font size to draw the texts.
+  private final float mFontSize;
+
+  // The name description of the text to localize. It's used to find the translated strings in the
+  // resource file.
+  private final String mTextName;
+
+  // The directory that contains all the needed font files (e.g. ttf, otf, ttc files).
+  private final String mFontDirPath;
+
+  // An explicit map from language to the font name to use.
+  // The map is extracted from frameworks/base/data/fonts/fonts.xml.
+  // And the language-subtag-registry is found in:
+  // https://www.iana.org/assignments/language-subtag-registry/language-subtag-registry
+  private static final String DEFAULT_FONT_NAME = "Roboto-Regular";
+  private static final Map<String, String> LANGUAGE_TO_FONT_MAP = new TreeMap<String, String>() {{
+    put("am", "NotoSansEthiopic-Regular");
+    put("ar", "NotoNaskhArabicUI-Regular");
+    put("as", "NotoSansBengaliUI-Regular");
+    put("bn", "NotoSansBengaliUI-Regular");
+    put("fa", "NotoNaskhArabicUI-Regular");
+    put("gu", "NotoSansGujaratiUI-Regular");
+    put("hi", "NotoSansDevanagariUI-Regular");
+    put("hy", "NotoSansArmenian-Regular");
+    put("iw", "NotoSansHebrew-Regular");
+    put("ja", "NotoSansCJK-Regular");
+    put("ka", "NotoSansGeorgian-Regular");
+    put("ko", "NotoSansCJK-Regular");
+    put("km", "NotoSansKhmerUI-Regular");
+    put("kn", "NotoSansKannadaUI-Regular");
+    put("lo", "NotoSansLaoUI-Regular");
+    put("ml", "NotoSansMalayalamUI-Regular");
+    put("mr", "NotoSansDevanagariUI-Regular");
+    put("my", "NotoSansMyanmarUI-Regular");
+    put("ne", "NotoSansDevanagariUI-Regular");
+    put("or", "NotoSansOriya-Regular");
+    put("pa", "NotoSansGurmukhiUI-Regular");
+    put("si", "NotoSansSinhala-Regular");
+    put("ta", "NotoSansTamilUI-Regular");
+    put("te", "NotoSansTeluguUI-Regular");
+    put("th", "NotoSansThaiUI-Regular");
+    put("ur", "NotoNaskhArabicUI-Regular");
+    put("zh", "NotoSansCJK-Regular");
+  }};
+
+  /**
+   * Exception to indicate the failure to find the translated text strings.
+   */
+  public static class LocalizedStringNotFoundException extends Exception {
+    public LocalizedStringNotFoundException(String message) {
+      super(message);
+    }
+
+    public LocalizedStringNotFoundException(String message, Throwable cause) {
+      super(message, cause);
+    }
+  }
+
+  /**
+   * Initailizes the fields of the image image.
+   */
+  public ImageGenerator(int imageWidth, String textName, float fontSize, String fontDirPath) {
+    mImageWidth = imageWidth;
+    mImageHeight = INITIAL_HEIGHT;
+    mVerticalOffset = 0;
+
+    // Initialize the canvas with the default height.
+    mBufferedImage = new BufferedImage(mImageWidth, mImageHeight, BufferedImage.TYPE_BYTE_GRAY);
+
+    mTextName = textName;
+    mFontSize = fontSize;
+    mFontDirPath = fontDirPath;
+  }
+
+  /**
+   * Finds the translated text string for the given textName by parsing the resourceFile.
+   * Example of the xml fields:
+   * <resources xmlns:android="http://schemas.android.com/apk/res/android">
+   *   <string name="recovery_installing_security" msgid="9184031299717114342">
+   * "Sicherheitsupdate wird installiert"</string>
+   * </resources>
+   *
+   * @param resourceFile the input resource file in xml format.
+   * @param textName the name description of the text.
+   *
+   * @return the string representation of the translated text.
+   */
+  private String getTextString(File resourceFile, String textName) throws IOException,
+      ParserConfigurationException, org.xml.sax.SAXException, LocalizedStringNotFoundException {
+    DocumentBuilderFactory builder = DocumentBuilderFactory.newInstance();
+    DocumentBuilder db = builder.newDocumentBuilder();
+
+    Document doc = db.parse(resourceFile);
+    doc.getDocumentElement().normalize();
+
+    NodeList nodeList = doc.getElementsByTagName("string");
+    for (int i = 0; i < nodeList.getLength(); i++) {
+      Node node = nodeList.item(i);
+      String name = node.getAttributes().getNamedItem("name").getNodeValue();
+      if (name.equals(textName)) {
+        return node.getTextContent();
+      }
+    }
+
+    throw new LocalizedStringNotFoundException(textName + " not found in "
+        + resourceFile.getName());
+  }
+
+  /**
+   * Constructs the locale from the name of the resource file.
+   */
+  private Locale getLocaleFromFilename(String filename) throws IOException {
+    // Gets the locale string by trimming the top "values-".
+    String localeString = filename.substring(7);
+    if (localeString.matches("[A-Za-z]+")) {
+      return Locale.forLanguageTag(localeString);
+    }
+    if (localeString.matches("[A-Za-z]+-r[A-Za-z]+")) {
+      // "${Language}-r${Region}". e.g. en-rGB
+      String[] tokens = localeString.split("-r");
+      return Locale.forLanguageTag(String.join("-", tokens));
+    }
+    if (localeString.startsWith("b+")) {
+      // The special case of b+sr+Latn, which has the form "b+${Language}+${ScriptName}"
+      String[] tokens = localeString.substring(2).split("\\+");
+      return Locale.forLanguageTag(String.join("-", tokens));
+    }
+
+    throw new IOException("Unrecognized locale string " + localeString);
+  }
+
+  /**
+   * Iterates over the xml files in the format of values-$LOCALE/strings.xml under the resource
+   * directory and collect the translated text.
+   *
+   * @param resourcePath the path to the resource directory
+   *
+   * @return a map with the locale as key, and translated text as value
+   *
+   * @throws LocalizedStringNotFoundException if we cannot find the translated text for the given
+   *    locale
+   **/
+  public Map<Locale, String> readLocalizedStringFromXmls(String resourcePath) throws
+      IOException, LocalizedStringNotFoundException {
+    File resourceDir = new File(resourcePath);
+    if (!resourceDir.isDirectory()) {
+      throw new LocalizedStringNotFoundException(resourcePath + " is not a directory.");
+    }
+
+    Map<Locale, String> result =
+        new TreeMap<Locale, String>(Comparator.comparing(Locale::toLanguageTag));
+
+    // Find all the localized resource subdirectories in the format of values-$LOCALE
+    String[] nameList = resourceDir.list(
+        (File file, String name) -> name.startsWith("values-"));
+    for (String name : nameList) {
+      File textFile = new File(resourcePath, name + "/strings.xml");
+      String localizedText;
+      try {
+        localizedText = getTextString(textFile, mTextName);
+      } catch (IOException | ParserConfigurationException | org.xml.sax.SAXException e) {
+        throw new LocalizedStringNotFoundException(
+            "Failed to read the translated text for locale " + name, e);
+      }
+
+      Locale locale = getLocaleFromFilename(name);
+      // Removes the double quotation mark from the text.
+      result.put(locale, localizedText.substring(1, localizedText.length() - 1));
+    }
+
+    return result;
+  }
+
+  /**
+   * Returns a font object associated given the given locale
+   *
+   * @throws IOException if the font file fails to open
+   * @throws FontFormatException if the font file doesn't have the expected format
+   */
+  private Font loadFontsByLocale(String language) throws IOException, FontFormatException {
+    String fontName = LANGUAGE_TO_FONT_MAP.getOrDefault(language, DEFAULT_FONT_NAME);
+    String[] suffixes = {".otf", ".ttf", ".ttc"};
+    for (String suffix : suffixes ) {
+      File fontFile = new File(mFontDirPath, fontName + suffix);
+      if (fontFile.isFile()) {
+        return Font.createFont(Font.TRUETYPE_FONT, fontFile).deriveFont(mFontSize);
+      }
+    }
+
+    throw new IOException("Can not find the font file " + fontName + " for language " + language);
+  }
+
+  /**
+   * Separates the text string by spaces and wraps it by words.
+  **/
+  private List<String> wrapTextByWords(String text, FontMetrics metrics) {
+    List<String> wrappedText = new ArrayList<>();
+    StringTokenizer st = new StringTokenizer(text, " \n");
+
+    StringBuilder line = new StringBuilder();
+    while (st.hasMoreTokens()) {
+      String token = st.nextToken();
+      if (metrics.stringWidth(line + token + " ") > mImageWidth) {
+        wrappedText.add(line.toString());
+        line = new StringBuilder();
+      }
+      line.append(token).append(" ");
+    }
+    wrappedText.add(line.toString());
+
+    return wrappedText;
+  }
+
+  /**
+   * Wraps the text with a maximum of mImageWidth pixels per line.
+   *
+   * @param text the string representation of text to wrap
+   * @param metrics the metrics of the Font used to draw the text; it gives the width in pixels of
+   *    the text given its string representation
+   *
+   * @return a list of strings with their width smaller than mImageWidth pixels
+   */
+  private List<String> wrapText(String text, FontMetrics metrics) {
+    // TODO(xunchang) handle other cases of text wrapping
+    // 1. RTL languages: "ar"(Arabic), "fa"(Persian), "he"(Hebrew), "iw"(Hebrew), "ur"(Urdu)
+    // 2. Language uses characters: CJK, "lo"(lao), "km"(khmer)
+
+    return wrapTextByWords(text, metrics);
+  }
+
+  /**
+   * Draws the text string on the canvas for given locale.
+   *
+   * @param text the string to draw on canvas
+   * @param locale the current locale tag of the string to draw
+   *
+   * @throws IOException if we cannot find the corresponding font file for the given locale.
+   * @throws FontFormatException if we failed to load the font file for the given locale.
+   */
+  private void drawText(String text, Locale locale) throws IOException, FontFormatException  {
+    Graphics2D graphics = mBufferedImage.createGraphics();
+    graphics.setColor(Color.WHITE);
+    graphics.setRenderingHint(
+        RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_GASP);
+    graphics.setFont(loadFontsByLocale(locale.getLanguage()));
+
+    System.out.println("Drawing text for locale " + locale + " text " + text);
+
+    FontMetrics fontMetrics = graphics.getFontMetrics();
+    List<String> wrappedText = wrapTextByWords(text, fontMetrics);
+    for (String line : wrappedText) {
+      int lineHeight = fontMetrics.getHeight();
+      // Doubles the height of the image if we are short of space.
+      if (mVerticalOffset + lineHeight >= mImageHeight) {
+        resizeHeight(mImageHeight * 2);
+      }
+
+      // Draws the text at mVerticalOffset and increments the offset with line space.
+      int baseLine = mVerticalOffset + lineHeight - fontMetrics.getDescent();
+      graphics.drawString(line, 0, baseLine);
+      mVerticalOffset += lineHeight;
+    }
+  }
+
+  /**
+   * Redraws the image with the new height.
+   *
+   * @param height the new height of the image in pixels.
+   */
+  private void resizeHeight(int height) {
+    BufferedImage resizedImage =
+        new BufferedImage(mImageWidth, height, BufferedImage.TYPE_BYTE_GRAY);
+    Graphics2D graphic = resizedImage.createGraphics();
+    graphic.drawImage(mBufferedImage, 0, 0, null);
+    graphic.dispose();
+
+    mBufferedImage = resizedImage;
+    mImageHeight = height;
+  }
+
+  /**
+   *  This function draws the font characters and saves the result to outputPath.
+   *
+   * @param localizedTextMap a map from locale to its translated text string
+   * @param outputPath the path to write the generated image file.
+   *
+   * @throws FontFormatException if there's a format error in one of the font file
+   * @throws IOException if we cannot find the font file for one of the locale, or we failed to
+   *    write the image file.
+   */
+  public void generateImage(Map<Locale, String> localizedTextMap, String outputPath) throws
+      FontFormatException, IOException {
+    for (Locale locale : localizedTextMap.keySet()) {
+      // TODO(xunchang) reprocess the locales for the same language and make the last locale the
+      // catch-all type. e.g. "zh-CN, zh-HK, zh-TW" will become "zh-CN, zh-HK, zh"
+      // Or maybe we don't need to support these variants?
+      drawText(localizedTextMap.get(locale), locale);
+    }
+
+    // TODO(xunchang) adjust the width to save some space if all texts are smaller than imageWidth.
+    resizeHeight(mVerticalOffset);
+    ImageIO.write(mBufferedImage, "png", new File(outputPath));
+  }
+
+  public static void printUsage() {
+    System.out.println("Usage: java -jar path_to_jar imageWidth textName fontDirectory"
+        + " resourceDirectory outputFilename");
+  }
+
+  public static void main(String[] args) throws NumberFormatException, IOException,
+      FontFormatException, LocalizedStringNotFoundException {
+    if (args.length != 5) {
+      printUsage();
+      System.err.println("We expect 5 arguments, get " + args.length);
+      System.exit(1);
+    }
+
+    // TODO(xunchang) switch to commandline parser
+    int imageWidth = Integer.parseUnsignedInt(args[0]);
+
+    ImageGenerator imageGenerator =
+        new ImageGenerator(imageWidth, args[1], DEFAULT_FONT_SIZE, args[2]);
+
+    Map<Locale, String> localizedStringMap =
+        imageGenerator.readLocalizedStringFromXmls(args[3]);
+    imageGenerator.generateImage(localizedStringMap, args[4]);
+  }
+}
+

tools/image_generator/ImageGenerator.mf

@@ -0,0 +1 @@
+Main-Class: com.android.recovery.tools.ImageGenerator

tools/image_generator/README.md

@@ -0,0 +1,20 @@
+Recovery Image Generator
+-------------------------
+
+This program uses java.awt.Graphics2D to generate the background text files used
+under recovery mode. And thus we don't need to do the manual work by running
+emulators with different dpi.
+
+# Usage:
+  `java -jar path_to_jar imageWidth textName fontDirectory resourceDirectory outputFilename`
+
+# Description of the parameters:
+1. `imageWidth`: The number of pixels per line; and the text strings will be
+   wrapped accordingly.
+2. `textName`: The description of the text string, e.g. "recovery_erasing",
+   "recovery_installing_security"
+3. `fontDirectory`: The directory that contains all the support .ttf | .ttc
+   files, e.g. $OUT/system/fonts/
+4. `resourceDirectory`: The resource directory that contains all the translated
+   strings in xml format, e.g. bootable/recovery/tools/recovery_l10n/res/
+5. `outputFilename`: Path to the generated image.

verifier.cpp

@@ -27,9 +27,13 @@
 #include <vector>
 
 #include <android-base/logging.h>
+#include <openssl/bio.h>
 #include <openssl/bn.h>
 #include <openssl/ecdsa.h>
+#include <openssl/evp.h>
 #include <openssl/obj_mac.h>
+#include <openssl/pem.h>
+#include <openssl/rsa.h>
 
 #include "asn1_decoder.h"
 #include "otautil/print_sha1.h"
@@ -441,6 +445,70 @@ std::unique_ptr<EC_KEY, ECKEYDeleter> parse_ec_key(FILE* file) {
     return key;
 }
 
+bool LoadCertificateFromBuffer(const std::vector<uint8_t>& pem_content, Certificate* cert) {
+  std::unique_ptr<BIO, decltype(&BIO_free)> content(
+      BIO_new_mem_buf(pem_content.data(), pem_content.size()), BIO_free);
+
+  std::unique_ptr<X509, decltype(&X509_free)> x509(
+      PEM_read_bio_X509(content.get(), nullptr, nullptr, nullptr), X509_free);
+  if (!x509) {
+    LOG(ERROR) << "Failed to read x509 certificate";
+    return false;
+  }
+
+  int nid = X509_get_signature_nid(x509.get());
+  switch (nid) {
+    // SignApk has historically accepted md5WithRSA certificates, but treated them as
+    // sha1WithRSA anyway. Continue to do so for backwards compatibility.
+    case NID_md5WithRSA:
+    case NID_md5WithRSAEncryption:
+    case NID_sha1WithRSA:
+    case NID_sha1WithRSAEncryption:
+      cert->hash_len = SHA_DIGEST_LENGTH;
+      break;
+    case NID_sha256WithRSAEncryption:
+    case NID_ecdsa_with_SHA256:
+      cert->hash_len = SHA256_DIGEST_LENGTH;
+      break;
+    default:
+      LOG(ERROR) << "Unrecognized signature nid " << OBJ_nid2ln(nid);
+      return false;
+  }
+
+  std::unique_ptr<EVP_PKEY, decltype(&EVP_PKEY_free)> public_key(X509_get_pubkey(x509.get()),
+                                                                 EVP_PKEY_free);
+  if (!public_key) {
+    LOG(ERROR) << "Failed to extract the public key from x509 certificate";
+    return false;
+  }
+
+  int key_type = EVP_PKEY_id(public_key.get());
+  // TODO(xunchang) check the rsa key has exponent 3 or 65537 with RSA_get0_key; and ec key is
+  // 256 bits.
+  if (key_type == EVP_PKEY_RSA) {
+    cert->key_type = Certificate::KEY_TYPE_RSA;
+    cert->ec.reset();
+    cert->rsa.reset(EVP_PKEY_get1_RSA(public_key.get()));
+    if (!cert->rsa) {
+      LOG(ERROR) << "Failed to get the rsa key info from public key";
+      return false;
+    }
+  } else if (key_type == EVP_PKEY_EC) {
+    cert->key_type = Certificate::KEY_TYPE_EC;
+    cert->rsa.reset();
+    cert->ec.reset(EVP_PKEY_get1_EC_KEY(public_key.get()));
+    if (!cert->ec) {
+      LOG(ERROR) << "Failed to get the ec key info from the public key";
+      return false;
+    }
+  } else {
+    LOG(ERROR) << "Unrecognized public key type " << OBJ_nid2ln(key_type);
+    return false;
+  }
+
+  return true;
+}
+
 // Reads a file containing one or more public keys as produced by
 // DumpPublicKey:  this is an RSAPublicKey struct as it would appear
 // as a C source literal, eg:

verifier.h

@@ -17,6 +17,8 @@
 #ifndef _RECOVERY_VERIFIER_H
 #define _RECOVERY_VERIFIER_H
 
+#include <stdint.h>
+
 #include <functional>
 #include <memory>
 #include <vector>
@@ -70,6 +72,10 @@ int verify_file(const unsigned char* addr, size_t length, const std::vector<Cert
 
 bool load_keys(const char* filename, std::vector<Certificate>& certs);
 
+// Parses a PEM-encoded x509 certificate from the given buffer and saves it into |cert|. Returns
+// false if there is a parsing failure or the signature's encryption algorithm is not supported.
+bool LoadCertificateFromBuffer(const std::vector<uint8_t>& pem_content, Certificate* cert);
+
 #define VERIFY_SUCCESS        0
 #define VERIFY_FAILURE        1