diff --git a/cleanspec.mk b/cleanspec.mk
index 22d9fe1..a3d84fa 100644
--- a/cleanspec.mk
+++ b/cleanspec.mk
@@ -75,6 +75,7 @@
 $(call add-clean-step, rm -rf $(OUT_DIR)/target/common/obj/APPS/PinyinIMEGoogleService_intermediates)
 $(call add-clean-step, rm -rf $(OUT_DIR)/target/common/obj/JAVA_LIBRARIES/com.android.inputmethod.pinyin.lib_intermediates)
 $(call add-clean-step, rm -rf $(OUT_DIR)/target/common/obj/APPS/PinyinIMEGoogleService_intermediates)
+$(call add-clean-step, rm -rf $(OUT_DIR)/target/common/obj/JAVA_LIBRARIES/framework_intermediates/src/telephony)
 
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
diff --git a/core/Makefile b/core/Makefile
index 58a9695..d4f9e18 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -62,9 +62,6 @@
 # Apps are always signed with test keys, and may be re-signed in a post-build
 # step.  If that happens, the "test-keys" tag will be removed by that step.
 BUILD_VERSION_TAGS += test-keys
-ifndef INCLUDE_TEST_OTA_KEYS
-  BUILD_VERSION_TAGS += ota-rel-keys
-endif
 BUILD_VERSION_TAGS := $(subst $(space),$(comma),$(sort $(BUILD_VERSION_TAGS)))
 
 # A human-readable string that descibes this build in detail.
@@ -645,13 +642,31 @@
   INTERNAL_RECOVERYIMAGE_ARGS += --cmdline "$(BOARD_KERNEL_CMDLINE)"
 endif
 
+# Keys authorized to sign OTA packages this build will accept.  The
+# build always uses test-keys for this; release packaging tools will
+# substitute other keys for this one.
+OTA_PUBLIC_KEYS := $(SRC_TARGET_DIR)/product/security/testkey.x509.pem
+
+# Generate a file containing the keys that will be read by the
+# recovery binary.
+RECOVERY_INSTALL_OTA_KEYS := \
+	$(call intermediates-dir-for,PACKAGING,ota_keys)/keys
+DUMPKEY_JAR := $(HOST_OUT_JAVA_LIBRARIES)/dumpkey.jar
+$(RECOVERY_INSTALL_OTA_KEYS): PRIVATE_OTA_PUBLIC_KEYS := $(OTA_PUBLIC_KEYS)
+$(RECOVERY_INSTALL_OTA_KEYS): $(OTA_PUBLIC_KEYS) $(DUMPKEY_JAR)
+	@echo "DumpPublicKey: $@ <= $(PRIVATE_OTA_PUBLIC_KEYS)"
+	@rm -rf $@
+	@mkdir -p $(dir $@)
+	java -jar $(DUMPKEY_JAR) $(PRIVATE_OTA_PUBLIC_KEYS) > $@
+
 $(INSTALLED_RECOVERYIMAGE_TARGET): $(MKBOOTFS) $(MKBOOTIMG) \
 		$(INSTALLED_RAMDISK_TARGET) \
 		$(INSTALLED_BOOTIMAGE_TARGET) \
 		$(recovery_binary) \
 		$(recovery_initrc) $(recovery_kernel) \
 		$(INSTALLED_2NDBOOTLOADER_TARGET) \
-		$(recovery_build_prop) $(recovery_resource_deps)
+		$(recovery_build_prop) $(recovery_resource_deps) \
+		$(RECOVERY_INSTALL_OTA_KEYS)
 	@echo ----- Making recovery image ------
 	rm -rf $(TARGET_RECOVERY_OUT)
 	mkdir -p $(TARGET_RECOVERY_OUT)
@@ -666,6 +681,7 @@
 	cp -rf $(recovery_resources_common) $(TARGET_RECOVERY_ROOT_OUT)/
 	$(foreach item,$(recovery_resources_private), \
 	  cp -rf $(item) $(TARGET_RECOVERY_ROOT_OUT)/)
+	cp $(RECOVERY_INSTALL_OTA_KEYS) $(TARGET_RECOVERY_ROOT_OUT)/res/keys
 	cat $(INSTALLED_DEFAULT_PROP_TARGET) $(recovery_build_prop) \
 	        > $(TARGET_RECOVERY_ROOT_OUT)/default.prop
 	$(MKBOOTFS) $(TARGET_RECOVERY_ROOT_OUT) | gzip > $(recovery_ramdisk)
@@ -765,15 +781,10 @@
 .PHONY: otapackage
 otapackage: $(INTERNAL_OTA_PACKAGE_TARGET)
 
-# Keys authorized to sign OTA packages this build will accept.
-ifeq ($(INCLUDE_TEST_OTA_KEYS),true)
-  OTA_PUBLIC_KEYS := \
-  	$(sort $(SRC_TARGET_DIR)/product/security/testkey.x509.pem $(OTA_PUBLIC_KEYS))
-endif
-
-ifeq ($(OTA_PUBLIC_KEYS),)
-  $(error No OTA_PUBLIC_KEYS defined)
-endif
+# Keys authorized to sign OTA packages this build will accept.  The
+# build always uses test-keys for this; release packaging tools will
+# substitute other keys for this one.
+OTA_PUBLIC_KEYS := $(SRC_TARGET_DIR)/product/security/testkey.x509.pem
 
 # Build a keystore with the authorized keys in it.
 # java/android/android/server/checkin/UpdateVerifier.java uses this.
@@ -790,21 +801,6 @@
 #           -import -file $$f -alias $(notdir $$f) || exit 1; \
 # done
 
-ifdef RECOVERY_INSTALL_OTA_KEYS_INC
-# Generate a C-includable file containing the keys.
-# RECOVERY_INSTALL_OTA_KEYS_INC is defined by recovery/Android.mk.
-# *** THIS IS A TOTAL HACK; EXECUTABLES MUST NOT CHANGE BETWEEN DIFFERENT
-#     PRODUCTS/BUILD TYPES. ***
-# TODO: make recovery read the keys from an external file.
-DUMPKEY_JAR := $(HOST_OUT_JAVA_LIBRARIES)/dumpkey.jar
-$(RECOVERY_INSTALL_OTA_KEYS_INC): PRIVATE_OTA_PUBLIC_KEYS := $(OTA_PUBLIC_KEYS)
-$(RECOVERY_INSTALL_OTA_KEYS_INC): $(OTA_PUBLIC_KEYS) $(DUMPKEY_JAR)
-	@echo "DumpPublicKey: $@ <= $(PRIVATE_OTA_PUBLIC_KEYS)"
-	@rm -rf $@
-	@mkdir -p $(dir $@)
-	$(hide) java -jar $(DUMPKEY_JAR) $(PRIVATE_OTA_PUBLIC_KEYS) > $@
-endif
-
 # -----------------------------------------------------------------
 # A zip of the directories that map to the target filesystem.
 # This zip can be used to create an OTA package or filesystem image
@@ -833,7 +829,7 @@
 endef
 
 built_ota_tools := \
- 	$(call intermediates-dir-for,EXECUTABLES,applypatch)/applypatch \
+	$(call intermediates-dir-for,EXECUTABLES,applypatch)/applypatch \
 	$(call intermediates-dir-for,EXECUTABLES,check_prereq)/check_prereq
 $(BUILT_TARGET_FILES_PACKAGE): PRIVATE_OTA_TOOLS := $(built_ota_tools)
 
@@ -903,6 +899,7 @@
 	@# build them.
 	$(hide) mkdir -p $(zip_root)/META
 	$(hide) $(ACP) $(APKCERTS_FILE) $(zip_root)/META/apkcerts.txt
+	$(hide)	echo "$(PRODUCT_OTA_PUBLIC_KEYS)" > $(zip_root)/META/otakeys.txt
 	@# Zip everything up, preserving symlinks
 	$(hide) (cd $(zip_root) && zip -qry ../$(notdir $@) .)
 
diff --git a/core/build_id.mk b/core/build_id.mk
index cb18bc4..9163cdf 100644
--- a/core/build_id.mk
+++ b/core/build_id.mk
@@ -23,7 +23,7 @@
 # (like "TC1-RC5").  It must be a single word, and is
 # capitalized by convention.
 #
-BUILD_ID := CUPCAKE
+BUILD_ID := DONUT-BURGER
 
 # DISPLAY_BUILD_NUMBER should only be set for development branches,
 # If set, the BUILD_NUMBER (cl) is appended to the BUILD_ID for
diff --git a/core/main.mk b/core/main.mk
index fdf2567..ebd2b9d 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -301,7 +301,6 @@
 	dalvik/tools/dmtracedump \
 	dalvik/tools/hprof-conv \
 	development/emulator/mksdcard \
-	development/tools/activitycreator \
 	development/tools/line_endings \
 	development/host \
 	external/expat \
diff --git a/core/product_config.mk b/core/product_config.mk
index 64488d8..17cb413 100644
--- a/core/product_config.mk
+++ b/core/product_config.mk
@@ -110,11 +110,11 @@
   TARGET_BUILD_VARIANT := $(word 2,$(product_goals))
 
   # The build server wants to do make PRODUCT-dream-installclean
-  # which really means TARGET_PRODUCT=dream make installclean.  
+  # which really means TARGET_PRODUCT=dream make installclean.
   ifneq ($(filter-out $(INTERNAL_VALID_VARIANTS),$(TARGET_BUILD_VARIANT)),)
 	MAKECMDGOALS := $(MAKECMDGOALS) $(TARGET_BUILD_VARIANT)
 	TARGET_BUILD_VARIANT := eng
-    default_goal_substitution := 
+    default_goal_substitution :=
   else
     default_goal_substitution := $(DEFAULT_GOAL)
   endif
@@ -135,7 +135,7 @@
   #
   # Note that modifying this will not affect the goals that make will
   # attempt to build, but it's important because we inspect this value
-  # in certain situations (like for "make sdk").  
+  # in certain situations (like for "make sdk").
   #
   MAKECMDGOALS := $(patsubst $(goal_name),$(default_goal_substitution),$(MAKECMDGOALS))
 
@@ -185,7 +185,10 @@
 # in PRODUCT_LOCALES, add them to PRODUCT_LOCALES.
 extra_locales := $(filter-out $(PRODUCT_LOCALES),$(CUSTOM_LOCALES))
 ifneq (,$(extra_locales))
-  $(info Adding CUSTOM_LOCALES [$(extra_locales)] to PRODUCT_LOCALES [$(PRODUCT_LOCALES)])
+  ifneq ($(CALLED_FROM_SETUP),true)
+    # Don't spam stdout, because envsetup.sh may be scraping values from it.
+    $(info Adding CUSTOM_LOCALES [$(extra_locales)] to PRODUCT_LOCALES [$(PRODUCT_LOCALES)])
+  endif
   PRODUCT_LOCALES += $(extra_locales)
   extra_locales :=
 endif
@@ -202,7 +205,7 @@
 
 PRODUCT_MODEL := $(strip $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_MODEL))
 ifndef PRODUCT_MODEL
-  PRODUCT_MODEL := $(strip $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_NAME)) 
+  PRODUCT_MODEL := $(strip $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_NAME))
 endif
 
 PRODUCT_MANUFACTURER := \
@@ -245,23 +248,12 @@
 	$(ADDITIONAL_BUILD_PROPERTIES) \
 	$(PRODUCT_PROPERTY_OVERRIDES)
 
-# Get the list of OTA public keys for the product.
-OTA_PUBLIC_KEYS := \
-	$(sort \
-	    $(OTA_PUBLIC_KEYS) \
-	    $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_OTA_PUBLIC_KEYS) \
-	 )
-
-# HACK: Not all products define OTA keys yet, and the -user build
-# will fail if no keys are defined.
-# TODO: Let a product opt out of needing OTA keys, and stop defaulting to
-#       the test key as soon as possible.
-ifeq (,$(strip $(OTA_PUBLIC_KEYS)))
-  ifeq (,$(CALLED_FROM_SETUP))
-    $(warning WARNING: adding test OTA key)
-  endif
-  OTA_PUBLIC_KEYS := $(SRC_TARGET_DIR)/product/security/testkey.x509.pem
-endif
+# The OTA key(s) specified by the product config, if any.  The names
+# of these keys are stored in the target-files zip so that post-build
+# signing tools can substitute them for the test key embedded by
+# default.
+PRODUCT_OTA_PUBLIC_KEYS := $(sort \
+    $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_OTA_PUBLIC_KEYS))
 
 # ---------------------------------------------------------------
 # Force the simulator to be the simulator, and make BUILD_TYPE
diff --git a/core/tasks/cts.mk b/core/tasks/cts.mk
index 9444377..f804813 100644
--- a/core/tasks/cts.mk
+++ b/core/tasks/cts.mk
@@ -102,7 +102,7 @@
 $(hide) java $(PRIVATE_JAVAOPTS) \
 	-classpath $(PRIVATE_CLASSPATH) \
 	$(PRIVATE_PARAMS) CollectAllTests $(1) \
-	$(2) $(3) $(4)
+	$(2) $(3)
 endef
 
 CORE_INTERMEDIATES :=$(call intermediates-dir-for,JAVA_LIBRARIES,core,,COMMON)
diff --git a/target/product/core.mk b/target/product/core.mk
index d79b1e1..7c1ca00 100644
--- a/target/product/core.mk
+++ b/target/product/core.mk
@@ -12,6 +12,7 @@
     Launcher \
     HTMLViewer \
     Phone \
+    ApplicationsProvider \
     ContactsProvider \
     DownloadProvider \
     GoogleSearch \
diff --git a/tools/releasetools/common.py b/tools/releasetools/common.py
index 705ed84..a512ff8 100644
--- a/tools/releasetools/common.py
+++ b/tools/releasetools/common.py
@@ -28,6 +28,7 @@
 class Options(object): pass
 OPTIONS = Options()
 OPTIONS.signapk_jar = "out/host/linux-x86/framework/signapk.jar"
+OPTIONS.dumpkey_jar = "out/host/linux-x86/framework/dumpkey.jar"
 OPTIONS.max_image_size = {}
 OPTIONS.verbose = False
 OPTIONS.tempfiles = []
@@ -134,6 +135,12 @@
   key_passwords = {}
   devnull = open("/dev/null", "w+b")
   for k in sorted(keylist):
+    # An empty-string key is used to mean don't re-sign this package.
+    # Obviously we don't need a password for this non-key.
+    if not k:
+      key_passwords[k] = None
+      continue
+
     p = subprocess.Popen(["openssl", "pkcs8", "-in", k+".pk8",
                           "-inform", "DER", "-nocrypt"],
                          stdin=devnull.fileno(),
diff --git a/tools/releasetools/ota_from_target_files b/tools/releasetools/ota_from_target_files
index dbac03d..c1e377a 100755
--- a/tools/releasetools/ota_from_target_files
+++ b/tools/releasetools/ota_from_target_files
@@ -33,6 +33,15 @@
       Generate an incremental OTA using the given target-files zip as
       the starting build.
 
+  -w  (--wipe_user_data)
+      Generate an OTA package that will wipe the user data partition
+      when installed.
+
+  -n  (--no_prereq)
+      Omit the timestamp prereq check normally included at the top of
+      the build scripts (used for developer OTA packages which
+      legitimately need to go back and forth).
+
 """
 
 import sys
@@ -58,6 +67,8 @@
 OPTIONS.require_verbatim = set()
 OPTIONS.prohibit_verbatim = set(("system/build.prop",))
 OPTIONS.patch_threshold = 0.95
+OPTIONS.wipe_user_data = False
+OPTIONS.omit_prereq = False
 
 def MostPopularKey(d, default):
   """Given a dict, return the key corresponding to the largest
@@ -318,9 +329,10 @@
 def WriteFullOTAPackage(input_zip, output_zip):
   script = []
 
-  ts = GetBuildProp("ro.build.date.utc", input_zip)
-  script.append("run_program PACKAGE:check_prereq %s" % (ts,))
-  IncludeBinary("check_prereq", input_zip, output_zip)
+  if not OPTIONS.omit_prereq:
+    ts = GetBuildProp("ro.build.date.utc", input_zip)
+    script.append("run_program PACKAGE:check_prereq %s" % (ts,))
+    IncludeBinary("check_prereq", input_zip, output_zip)
 
   AppendAssertions(script, input_zip)
 
@@ -331,6 +343,9 @@
   script.append("write_radio_image PACKAGE:radio.img")
   script.append("show_progress 0.5 0")
 
+  if OPTIONS.wipe_user_data:
+    script.append("format DATA:")
+
   script.append("format SYSTEM:")
   script.append("copy_dir PACKAGE:system SYSTEM:")
 
@@ -511,6 +526,9 @@
 
   script.append("\n# ---- start making changes here\n")
 
+  if OPTIONS.wipe_user_data:
+    script.append("format DATA:")
+
   DeleteFiles(script, [SubstituteRoot(i[0]) for i in verbatim_targets])
 
   if updating_boot:
@@ -602,21 +620,25 @@
   def option_handler(o, a):
     if o in ("-b", "--board_config"):
       common.LoadBoardConfig(a)
-      return True
     elif o in ("-k", "--package_key"):
       OPTIONS.package_key = a
-      return True
     elif o in ("-i", "--incremental_from"):
       OPTIONS.incremental_source = a
-      return True
+    elif o in ("-w", "--wipe_user_data"):
+      OPTIONS.wipe_user_data = True
+    elif o in ("-n", "--no_prereq"):
+      OPTIONS.omit_prereq = True
     else:
       return False
+    return True
 
   args = common.ParseOptions(argv, __doc__,
-                             extra_opts="b:k:i:d:",
+                             extra_opts="b:k:i:d:wn",
                              extra_long_opts=["board_config=",
                                               "package_key=",
-                                              "incremental_from="],
+                                              "incremental_from=",
+                                              "wipe_user_data",
+                                              "no_prereq"],
                              extra_option_handler=option_handler)
 
   if len(args) != 2:
diff --git a/tools/releasetools/sign_target_files_apks b/tools/releasetools/sign_target_files_apks
index b632924..b3bfaee 100755
--- a/tools/releasetools/sign_target_files_apks
+++ b/tools/releasetools/sign_target_files_apks
@@ -47,6 +47,20 @@
 
       -d and -k options are added to the set of mappings in the order
       in which they appear on the command line.
+
+  -o  (--replace_ota_keys)
+      Replace the certificate (public key) used by OTA package
+      verification with the one specified in the input target_files
+      zip (in the META/otakeys.txt file).  Key remapping (-k and -d)
+      is performed on this key.
+
+  -t  (--tag_changes)  <+tag>,<-tag>,...
+      Comma-separated list of changes to make to the set of tags (in
+      the last component of the build fingerprint).  Prefix each with
+      '+' or '-' to indicate whether that tag should be added or
+      removed.  Changes are processed in the order they appear.
+      Default value is "-test-keys,+ota-rel-keys,+release-keys".
+
 """
 
 import sys
@@ -55,6 +69,8 @@
   print >> sys.stderr, "Python 2.4 or newer is required."
   sys.exit(1)
 
+import cStringIO
+import copy
 import os
 import re
 import subprocess
@@ -67,7 +83,8 @@
 
 OPTIONS.extra_apks = {}
 OPTIONS.key_map = {}
-
+OPTIONS.replace_ota_keys = False
+OPTIONS.tag_changes = ("-test-keys", "+ota-rel-keys", "+release-keys")
 
 def GetApkCerts(tf_zip):
   certmap = {}
@@ -103,41 +120,122 @@
 def SignApks(input_tf_zip, output_tf_zip):
   apk_key_map = GetApkCerts(input_tf_zip)
 
-  key_passwords = common.GetKeyPasswords(set(apk_key_map.values()))
-
   maxsize = max([len(os.path.basename(i.filename))
                  for i in input_tf_zip.infolist()
                  if i.filename.endswith('.apk')])
 
+  # Check that all the APKs we want to sign have keys specified, and
+  # error out if they don't.  Do this before prompting for key
+  # passwords in case we're going to fail anyway.
+  unknown_apks = []
   for info in input_tf_zip.infolist():
-    data = input_tf_zip.read(info.filename)
     if info.filename.endswith(".apk"):
       name = os.path.basename(info.filename)
-      key = apk_key_map.get(name, None)
-      if key is not None:
-        print "signing: %-*s (%s)" % (maxsize, name, key)
+      if name not in apk_key_map:
+        unknown_apks.append(name)
+  if unknown_apks:
+    print "ERROR: no key specified for:\n\n ",
+    print "\n  ".join(unknown_apks)
+    print "\nUse '-e <apkname>=' to specify a key (which may be an"
+    print "empty string to not sign this apk)."
+    sys.exit(1)
+
+  key_passwords = common.GetKeyPasswords(set(apk_key_map.values()))
+
+  for info in input_tf_zip.infolist():
+    data = input_tf_zip.read(info.filename)
+    out_info = copy.copy(info)
+    if info.filename.endswith(".apk"):
+      name = os.path.basename(info.filename)
+      key = apk_key_map[name]
+      if key:
+        print "    signing: %-*s (%s)" % (maxsize, name, key)
         signed_data = SignApk(data, key, key_passwords[key])
-        output_tf_zip.writestr(info, signed_data)
+        output_tf_zip.writestr(out_info, signed_data)
       else:
         # an APK we're not supposed to sign.
-        print "skipping: %s" % (name,)
-        output_tf_zip.writestr(info, data)
-    elif info.filename == "SYSTEM/build.prop":
-      # Change build fingerprint to reflect the fact that apps are signed.
-      m = re.search(r"ro\.build\.fingerprint=.*\b(test-keys)\b.*", data)
-      if not m:
-        print 'WARNING: ro.build.fingerprint does not contain "test-keys"'
-      else:
-        data = data[:m.start(1)] + "release-keys" + data[m.end(1):]
-      m = re.search(r"ro\.build\.description=.*\b(test-keys)\b.*", data)
-      if not m:
-        print 'WARNING: ro.build.description does not contain "test-keys"'
-      else:
-        data = data[:m.start(1)] + "release-keys" + data[m.end(1):]
-      output_tf_zip.writestr(info, data)
+        print "NOT signing: %s" % (name,)
+        output_tf_zip.writestr(out_info, data)
+    elif info.filename in ("SYSTEM/build.prop",
+                           "RECOVERY/RAMDISK/default.prop"):
+      print "rewriting %s:" % (info.filename,)
+      new_data = RewriteProps(data)
+      output_tf_zip.writestr(out_info, new_data)
     else:
       # a non-APK file; copy it verbatim
-      output_tf_zip.writestr(info, data)
+      output_tf_zip.writestr(out_info, data)
+
+
+def RewriteProps(data):
+  output = []
+  for line in data.split("\n"):
+    line = line.strip()
+    original_line = line
+    if line and line[0] != '#':
+      key, value = line.split("=", 1)
+      if key == "ro.build.fingerprint":
+        pieces = line.split("/")
+        tags = set(pieces[-1].split(","))
+        for ch in OPTIONS.tag_changes:
+          if ch[0] == "-":
+            tags.discard(ch[1:])
+          elif ch[0] == "+":
+            tags.add(ch[1:])
+        line = "/".join(pieces[:-1] + [",".join(sorted(tags))])
+      elif key == "ro.build.description":
+        pieces = line.split(" ")
+        assert len(pieces) == 5
+        tags = set(pieces[-1].split(","))
+        for ch in OPTIONS.tag_changes:
+          if ch[0] == "-":
+            tags.discard(ch[1:])
+          elif ch[0] == "+":
+            tags.add(ch[1:])
+        line = " ".join(pieces[:-1] + [",".join(sorted(tags))])
+    if line != original_line:
+      print "  replace: ", original_line
+      print "     with: ", line
+    output.append(line)
+  return "\n".join(output) + "\n"
+
+
+def ReplaceOtaKeys(input_tf_zip, output_tf_zip):
+  try:
+    keylist = input_tf_zip.read("META/otakeys.txt").split()
+  except KeyError:
+    raise ExternalError("can't read META/otakeys.txt from input")
+
+  mapped_keys = []
+  for k in keylist:
+    m = re.match(r"^(.*)\.x509\.pem$", k)
+    if not m:
+      raise ExternalError("can't parse \"%s\" from META/otakeys.txt" % (k,))
+    k = m.group(1)
+    mapped_keys.append(OPTIONS.key_map.get(k, k) + ".x509.pem")
+
+  print "using:\n   ", "\n   ".join(mapped_keys)
+  print "for OTA package verification"
+
+  # recovery uses a version of the key that has been slightly
+  # predigested (by DumpPublicKey.java) and put in res/keys.
+
+  p = common.Run(["java", "-jar", OPTIONS.dumpkey_jar] + mapped_keys,
+                 stdout=subprocess.PIPE)
+  data, _ = p.communicate()
+  if p.returncode != 0:
+    raise ExternalError("failed to run dumpkeys")
+  output_tf_zip.writestr("RECOVERY/RAMDISK/res/keys", data)
+
+  # SystemUpdateActivity uses the x509.pem version of the keys, but
+  # put into a zipfile system/etc/security/otacerts.zip.
+
+  tempfile = cStringIO.StringIO()
+  certs_zip = zipfile.ZipFile(tempfile, "w")
+  for k in mapped_keys:
+    certs_zip.write(k)
+  certs_zip.close()
+  output_tf_zip.writestr("SYSTEM/etc/security/otacerts.zip",
+                         tempfile.getvalue())
 
 
 def main(argv):
@@ -160,16 +258,28 @@
     elif o in ("-k", "--key_mapping"):
       s, d = a.split("=")
       OPTIONS.key_map[s] = d
+    elif o in ("-o", "--replace_ota_keys"):
+      OPTIONS.replace_ota_keys = True
+    elif o in ("-t", "--tag_changes"):
+      new = []
+      for i in a.split(","):
+        i = i.strip()
+        if not i or i[0] not in "-+":
+          raise ValueError("Bad tag change '%s'" % (i,))
+        new.append(i[0] + i[1:].strip())
+      OPTIONS.tag_changes = tuple(new)
     else:
       return False
     return True
 
   args = common.ParseOptions(argv, __doc__,
-                             extra_opts="s:e:d:k:",
+                             extra_opts="s:e:d:k:ot:",
                              extra_long_opts=["signapk_jar=",
                                               "extra_apks=",
                                               "default_key_mappings=",
-                                              "key_mapping="],
+                                              "key_mapping=",
+                                              "replace_ota_keys",
+                                              "tag_changes="],
                              extra_option_handler=option_handler)
 
   if len(args) != 2:
@@ -181,6 +291,9 @@
 
   SignApks(input_zip, output_zip)
 
+  if OPTIONS.replace_ota_keys:
+    ReplaceOtaKeys(input_zip, output_zip)
+
   input_zip.close()
   output_zip.close()
 
diff --git a/tools/zipalign/ZipAlign.cpp b/tools/zipalign/ZipAlign.cpp
index 9e3cb66..058f9ed 100644
--- a/tools/zipalign/ZipAlign.cpp
+++ b/tools/zipalign/ZipAlign.cpp
@@ -30,7 +30,8 @@
 {
     fprintf(stderr, "Zip alignment utility\n");
     fprintf(stderr,
-        "Usage: zipalign [-f] [-v] <align> infile.zip outfile.zip\n");
+        "Usage: zipalign [-f] [-v] <align> infile.zip outfile.zip\n"
+        "       zipalign -c [-v] <align> infile.zip\n" );
 }
 
 /*
@@ -152,14 +153,14 @@
         pEntry = zipFile.getEntryByIndex(i);
         if (pEntry->isCompressed()) {
             if (verbose) {
-                printf("%8ld %s (OK - compressed)\n", 
+                printf("%8ld %s (OK - compressed)\n",
                     (long) pEntry->getFileOffset(), pEntry->getFileName());
             }
         } else {
             long offset = pEntry->getFileOffset();
             if ((offset % alignment) != 0) {
                 if (verbose) {
-                    printf("%8ld %s (BAD - %ld)\n", 
+                    printf("%8ld %s (BAD - %ld)\n",
                         (long) offset, pEntry->getFileName(),
                         offset % alignment);
                 }
@@ -185,6 +186,7 @@
 int main(int argc, char* const argv[])
 {
     bool wantUsage = false;
+    bool check = false;
     bool force = false;
     bool verbose = false;
     int result = 1;
@@ -204,6 +206,9 @@
 
         while (*cp != '\0') {
             switch (*cp) {
+            case 'c':
+                check = true;
+                break;
             case 'f':
                 force = true;
                 break;
@@ -223,7 +228,7 @@
         argv++;
     }
 
-    if (argc != 3) {
+    if (!((check && argc == 2) || (!check && argc == 3))) {
         wantUsage = true;
         goto bail;
     }
@@ -235,12 +240,17 @@
         goto bail;
     }
 
-    /* create the new archive */
-    result = process(argv[1], argv[2], alignment, force);
+    if (check) {
+        /* check existing archive for correct alignment */
+        result = verify(argv[1], alignment, verbose);
+    } else {
+        /* create the new archive */
+        result = process(argv[1], argv[2], alignment, force);
 
-    /* trust, but verify */
-    if (result == 0)
-        result = verify(argv[2], alignment, verbose);
+        /* trust, but verify */
+        if (result == 0)
+            result = verify(argv[2], alignment, verbose);
+    }
 
 bail:
     if (wantUsage) {
@@ -250,4 +260,3 @@
 
     return result;
 }
-