diff --git a/tools/releasetools/common.py b/tools/releasetools/common.py
index 664a7d3..95aeb62 100644
--- a/tools/releasetools/common.py
+++ b/tools/releasetools/common.py
@@ -592,46 +592,7 @@
   return key_passwords
 
 
-def GetMinSdkVersion(apk_name):
-  """Get the minSdkVersion delared in the APK. This can be both a decimal number
-  (API Level) or a codename.
-  """
-
-  p = Run(["aapt", "dump", "badging", apk_name], stdout=subprocess.PIPE)
-  output, err = p.communicate()
-  if err:
-    raise ExternalError("Failed to obtain minSdkVersion: aapt return code %s"
-        % (p.returncode,))
-
-  for line in output.split("\n"):
-    # Looking for lines such as sdkVersion:'23' or sdkVersion:'M'
-    m = re.match(r'sdkVersion:\'([^\']*)\'', line)
-    if m:
-      return m.group(1)
-  raise ExternalError("No minSdkVersion returned by aapt")
-
-
-def GetMinSdkVersionInt(apk_name, codename_to_api_level_map):
-  """Get the minSdkVersion declared in the APK as a number (API Level). If
-  minSdkVersion is set to a codename, it is translated to a number using the
-  provided map.
-  """
-
-  version = GetMinSdkVersion(apk_name)
-  try:
-    return int(version)
-  except ValueError:
-    # Not a decimal number. Codename?
-    if version in codename_to_api_level_map:
-      return codename_to_api_level_map[version]
-    else:
-      raise ExternalError("Unknown minSdkVersion: '%s'. Known codenames: %s"
-                          % (version, codename_to_api_level_map))
-
-
-def SignFile(input_name, output_name, key, password, min_api_level=None,
-    codename_to_api_level_map=dict(),
-    whole_file=False):
+def SignFile(input_name, output_name, key, password, whole_file=False):
   """Sign the input_name zip/jar/apk, producing output_name.  Use the
   given key and password (the latter may be None if the key does not
   have a password.
@@ -639,13 +600,6 @@
   If whole_file is true, use the "-w" option to SignApk to embed a
   signature that covers the whole file in the archive comment of the
   zip file.
-
-  min_api_level is the API Level (int) of the oldest platform this file may end
-  up on. If not specified for an APK, the API Level is obtained by interpreting
-  the minSdkVersion attribute of the APK's AndroidManifest.xml.
-
-  codename_to_api_level_map is needed to translate the codename which may be
-  encountered as the APK's minSdkVersion.
   """
 
   java_library_path = os.path.join(
@@ -658,15 +612,6 @@
   cmd.extend(OPTIONS.extra_signapk_args)
   if whole_file:
     cmd.append("-w")
-
-  min_sdk_version = min_api_level
-  if min_sdk_version is None:
-    if not whole_file:
-      min_sdk_version = GetMinSdkVersionInt(
-          input_name, codename_to_api_level_map)
-  if min_sdk_version is not None:
-    cmd.extend(["--min-sdk-version", str(min_sdk_version)])
-
   cmd.extend([key + OPTIONS.public_key_suffix,
               key + OPTIONS.private_key_suffix,
               input_name, output_name])
diff --git a/tools/releasetools/sign_target_files_apks.py b/tools/releasetools/sign_target_files_apks.py
index 8941e35..baf60f5 100755
--- a/tools/releasetools/sign_target_files_apks.py
+++ b/tools/releasetools/sign_target_files_apks.py
@@ -127,34 +127,14 @@
     sys.exit(1)
 
 
-def SignApk(data, keyname, pw, platform_api_level, codename_to_api_level_map):
+def SignApk(data, keyname, pw):
   unsigned = tempfile.NamedTemporaryFile()
   unsigned.write(data)
   unsigned.flush()
 
   signed = tempfile.NamedTemporaryFile()
 
-  # For pre-N builds, don't upgrade to SHA-256 JAR signatures based on the APK's
-  # minSdkVersion to avoid increasing incremental OTA update sizes. If an APK
-  # didn't change, we don't want its signature to change due to the switch
-  # from SHA-1 to SHA-256.
-  # By default, APK signer chooses SHA-256 signatures if the APK's minSdkVersion
-  # is 18 or higher. For pre-N builds we disable this mechanism by pretending
-  # that the APK's minSdkVersion is 1.
-  # For N+ builds, we let APK signer rely on the APK's minSdkVersion to
-  # determine whether to use SHA-256.
-  min_api_level = None
-  if platform_api_level > 23:
-    # Let APK signer choose whether to use SHA-1 or SHA-256, based on the APK's
-    # minSdkVersion attribute
-    min_api_level = None
-  else:
-    # Force APK signer to use SHA-1
-    min_api_level = 1
-
-  common.SignFile(unsigned.name, signed.name, keyname, pw,
-      min_api_level=min_api_level,
-      codename_to_api_level_map=codename_to_api_level_map)
+  common.SignFile(unsigned.name, signed.name, keyname, pw)
 
   data = signed.read()
   unsigned.close()
@@ -164,8 +144,7 @@
 
 
 def ProcessTargetFiles(input_tf_zip, output_tf_zip, misc_info,
-                       apk_key_map, key_passwords, platform_api_level,
-                       codename_to_api_level_map):
+                       apk_key_map, key_passwords):
 
   maxsize = max([len(os.path.basename(i.filename))
                  for i in input_tf_zip.infolist()
@@ -221,8 +200,7 @@
       key = apk_key_map[name]
       if key not in common.SPECIAL_CERT_STRINGS:
         print "    signing: %-*s (%s)" % (maxsize, name, key)
-        signed_data = SignApk(data, key, key_passwords[key], platform_api_level,
-            codename_to_api_level_map)
+        signed_data = SignApk(data, key, key_passwords[key])
         common.ZipWriteStr(output_tf_zip, out_info, signed_data)
       else:
         # an APK we're not supposed to sign.
@@ -462,57 +440,6 @@
       OPTIONS.key_map[s] = d
 
 
-def GetApiLevelAndCodename(input_tf_zip):
-  data = input_tf_zip.read("SYSTEM/build.prop")
-  api_level = None
-  codename = None
-  for line in data.split("\n"):
-    line = line.strip()
-    original_line = line
-    if line and line[0] != '#' and "=" in line:
-      key, value = line.split("=", 1)
-      key = key.strip()
-      if key == "ro.build.version.sdk":
-        api_level = int(value.strip())
-      elif key == "ro.build.version.codename":
-        codename = value.strip()
-
-  if api_level is None:
-    raise ValueError("No ro.build.version.sdk in SYSTEM/build.prop")
-  if codename is None:
-    raise ValueError("No ro.build.version.codename in SYSTEM/build.prop")
-
-  return (api_level, codename)
-
-
-def GetCodenameToApiLevelMap(input_tf_zip):
-  data = input_tf_zip.read("SYSTEM/build.prop")
-  api_level = None
-  codenames = None
-  for line in data.split("\n"):
-    line = line.strip()
-    original_line = line
-    if line and line[0] != '#' and "=" in line:
-      key, value = line.split("=", 1)
-      key = key.strip()
-      if key == "ro.build.version.sdk":
-        api_level = int(value.strip())
-      elif key == "ro.build.version.all_codenames":
-        codenames = value.strip().split(",")
-
-  if api_level is None:
-    raise ValueError("No ro.build.version.sdk in SYSTEM/build.prop")
-  if codenames is None:
-    raise ValueError("No ro.build.version.all_codenames in SYSTEM/build.prop")
-
-  result = dict()
-  for codename in codenames:
-    codename = codename.strip()
-    if len(codename) > 0:
-      result[codename] = api_level
-  return result
-
-
 def main(argv):
 
   key_mapping_options = []
@@ -571,17 +498,8 @@
   CheckAllApksSigned(input_zip, apk_key_map)
 
   key_passwords = common.GetKeyPasswords(set(apk_key_map.values()))
-  platform_api_level, platform_codename = GetApiLevelAndCodename(input_zip)
-  codename_to_api_level_map = GetCodenameToApiLevelMap(input_zip)
-  # Android N will be API Level 24, but isn't yet.
-  # TODO: Remove this workaround once Android N is officially API Level 24.
-  if platform_api_level == 23 and platform_codename == "N":
-    platform_api_level = 24
-
   ProcessTargetFiles(input_zip, output_zip, misc_info,
-                     apk_key_map, key_passwords,
-                     platform_api_level,
-                     codename_to_api_level_map)
+                     apk_key_map, key_passwords)
 
   common.ZipClose(input_zip)
   common.ZipClose(output_zip)