diff --git a/tools/releasetools/blockimgdiff.py b/tools/releasetools/blockimgdiff.py
index d33c2f7..211182a 100644
--- a/tools/releasetools/blockimgdiff.py
+++ b/tools/releasetools/blockimgdiff.py
@@ -537,14 +537,6 @@
 
     self.touched_src_sha1 = self.src.RangeSha1(self.touched_src_ranges)
 
-    if self.tgt.hashtree_info:
-      out.append("compute_hash_tree {} {} {} {} {}\n".format(
-          self.tgt.hashtree_info.hashtree_range.to_string_raw(),
-          self.tgt.hashtree_info.filesystem_range.to_string_raw(),
-          self.tgt.hashtree_info.hash_algorithm,
-          self.tgt.hashtree_info.salt,
-          self.tgt.hashtree_info.root_hash))
-
     # Zero out extended blocks as a workaround for bug 20881595.
     if self.tgt.extended:
       assert (WriteSplitTransfers(out, "zero", self.tgt.extended) ==
@@ -830,12 +822,6 @@
           assert touched[i] == 0
           touched[i] = 1
 
-    if self.tgt.hashtree_info:
-      for s, e in self.tgt.hashtree_info.hashtree_range:
-        for i in range(s, e):
-          assert touched[i] == 0
-          touched[i] = 1
-
     # Check that we've written every target block.
     for s, e in self.tgt.care_map:
       for i in range(s, e):
diff --git a/tools/releasetools/common.py b/tools/releasetools/common.py
index ac6c46f..fef6662 100644
--- a/tools/releasetools/common.py
+++ b/tools/releasetools/common.py
@@ -2055,7 +2055,6 @@
 def GetUserImage(which, tmpdir, input_zip,
                  info_dict=None,
                  allow_shared_blocks=None,
-                 hashtree_info_generator=None,
                  reset_file_map=False):
   """Returns an Image object suitable for passing to BlockImageDiff.
 
@@ -2072,8 +2071,6 @@
     info_dict: The dict to be looked up for relevant info.
     allow_shared_blocks: If image is sparse, whether having shared blocks is
         allowed. If none, it is looked up from info_dict.
-    hashtree_info_generator: If present and image is sparse, generates the
-        hashtree_info for this sparse image.
     reset_file_map: If true and image is sparse, reset file map before returning
         the image.
   Returns:
@@ -2095,15 +2092,14 @@
     allow_shared_blocks = info_dict.get("ext4_share_dup_blocks") == "true"
 
   if is_sparse:
-    img = GetSparseImage(which, tmpdir, input_zip, allow_shared_blocks,
-                         hashtree_info_generator)
+    img = GetSparseImage(which, tmpdir, input_zip, allow_shared_blocks)
     if reset_file_map:
       img.ResetFileMap()
     return img
-  return GetNonSparseImage(which, tmpdir, hashtree_info_generator)
+  return GetNonSparseImage(which, tmpdir)
 
 
-def GetNonSparseImage(which, tmpdir, hashtree_info_generator=None):
+def GetNonSparseImage(which, tmpdir):
   """Returns a Image object suitable for passing to BlockImageDiff.
 
   This function loads the specified non-sparse image from the given path.
@@ -2121,11 +2117,10 @@
   # ota_from_target_files.py (since LMP).
   assert os.path.exists(path) and os.path.exists(mappath)
 
-  return images.FileImage(path, hashtree_info_generator=hashtree_info_generator)
+  return images.FileImage(path)
 
 
-def GetSparseImage(which, tmpdir, input_zip, allow_shared_blocks,
-                   hashtree_info_generator=None):
+def GetSparseImage(which, tmpdir, input_zip, allow_shared_blocks):
   """Returns a SparseImage object suitable for passing to BlockImageDiff.
 
   This function loads the specified sparse image from the given path, and
@@ -2138,8 +2133,6 @@
     tmpdir: The directory that contains the prebuilt image and block map file.
     input_zip: The target-files ZIP archive.
     allow_shared_blocks: Whether having shared blocks is allowed.
-    hashtree_info_generator: If present, generates the hashtree_info for this
-        sparse image.
   Returns:
     A SparseImage object, with file_map info loaded.
   """
@@ -2156,8 +2149,7 @@
   clobbered_blocks = "0"
 
   image = sparse_img.SparseImage(
-      path, mappath, clobbered_blocks, allow_shared_blocks=allow_shared_blocks,
-      hashtree_info_generator=hashtree_info_generator)
+      path, mappath, clobbered_blocks, allow_shared_blocks=allow_shared_blocks)
 
   # block.map may contain less blocks, because mke2fs may skip allocating blocks
   # if they contain all zeros. We can't reconstruct such a file from its block
diff --git a/tools/releasetools/images.py b/tools/releasetools/images.py
index a24148a..d06b979 100644
--- a/tools/releasetools/images.py
+++ b/tools/releasetools/images.py
@@ -149,7 +149,7 @@
 class FileImage(Image):
   """An image wrapped around a raw image file."""
 
-  def __init__(self, path, hashtree_info_generator=None):
+  def __init__(self, path):
     self.path = path
     self.blocksize = 4096
     self._file_size = os.path.getsize(self.path)
@@ -166,10 +166,6 @@
 
     self.generator_lock = threading.Lock()
 
-    self.hashtree_info = None
-    if hashtree_info_generator:
-      self.hashtree_info = hashtree_info_generator.Generate(self)
-
     zero_blocks = []
     nonzero_blocks = []
     reference = '\0' * self.blocksize
@@ -190,8 +186,6 @@
       self.file_map["__ZERO"] = RangeSet(data=zero_blocks)
     if nonzero_blocks:
       self.file_map["__NONZERO"] = RangeSet(data=nonzero_blocks)
-    if self.hashtree_info:
-      self.file_map["__HASHTREE"] = self.hashtree_info.hashtree_range
 
   def __del__(self):
     self._file.close()
diff --git a/tools/releasetools/non_ab_ota.py b/tools/releasetools/non_ab_ota.py
index 9732cda..6c927ec 100644
--- a/tools/releasetools/non_ab_ota.py
+++ b/tools/releasetools/non_ab_ota.py
@@ -40,12 +40,9 @@
                                         info_dict=source_info,
                                         allow_shared_blocks=allow_shared_blocks)
 
-    hashtree_info_generator = verity_utils.CreateHashtreeInfoGenerator(
-        name, 4096, target_info)
     partition_tgt = common.GetUserImage(name, OPTIONS.target_tmp, target_zip,
                                         info_dict=target_info,
-                                        allow_shared_blocks=allow_shared_blocks,
-                                        hashtree_info_generator=hashtree_info_generator)
+                                        allow_shared_blocks=allow_shared_blocks)
 
     # Check the first block of the source system partition for remount R/W only
     # if the filesystem is ext4.
diff --git a/tools/releasetools/sparse_img.py b/tools/releasetools/sparse_img.py
index 524c0f2..e824a64 100644
--- a/tools/releasetools/sparse_img.py
+++ b/tools/releasetools/sparse_img.py
@@ -41,8 +41,7 @@
   """
 
   def __init__(self, simg_fn, file_map_fn=None, clobbered_blocks=None,
-               mode="rb", build_map=True, allow_shared_blocks=False,
-               hashtree_info_generator=None):
+               mode="rb", build_map=True, allow_shared_blocks=False):
     self.simg_f = f = open(simg_fn, mode)
 
     header_bin = f.read(28)
@@ -74,8 +73,6 @@
         blk_sz, total_chunks)
 
     if not build_map:
-      assert not hashtree_info_generator, \
-        "Cannot generate the hashtree info without building the offset map."
       return
 
     pos = 0   # in blocks
@@ -114,16 +111,6 @@
         if data_sz != 0:
           raise ValueError("Don't care chunk input size is non-zero (%u)" %
                            (data_sz))
-        # Fills the don't care data ranges with zeros.
-        # TODO(xunchang) pass the care_map to hashtree info generator.
-        if hashtree_info_generator:
-          fill_data = '\x00' * 4
-          # In order to compute verity hashtree on device, we need to write
-          # zeros explicitly to the don't care ranges. Because these ranges may
-          # contain non-zero data from the previous build.
-          care_data.append(pos)
-          care_data.append(pos + chunk_sz)
-          offset_map.append((pos, chunk_sz, None, fill_data))
 
         pos += chunk_sz
 
@@ -150,10 +137,6 @@
     extended = extended.intersect(all_blocks).subtract(self.care_map)
     self.extended = extended
 
-    self.hashtree_info = None
-    if hashtree_info_generator:
-      self.hashtree_info = hashtree_info_generator.Generate(self)
-
     if file_map_fn:
       self.LoadFileBlockMap(file_map_fn, self.clobbered_blocks,
                             allow_shared_blocks)
@@ -286,8 +269,6 @@
         remaining = remaining.subtract(ranges)
 
     remaining = remaining.subtract(clobbered_blocks)
-    if self.hashtree_info:
-      remaining = remaining.subtract(self.hashtree_info.hashtree_range)
 
     # For all the remaining blocks in the care_map (ie, those that
     # aren't part of the data for any file nor part of the clobbered_blocks),
@@ -350,8 +331,6 @@
         out["__NONZERO-%d" % i] = rangelib.RangeSet(data=blocks)
     if clobbered_blocks:
       out["__COPY"] = clobbered_blocks
-    if self.hashtree_info:
-      out["__HASHTREE"] = self.hashtree_info.hashtree_range
 
   def ResetFileMap(self):
     """Throw away the file map and treat the entire image as
diff --git a/tools/releasetools/test_verity_utils.py b/tools/releasetools/test_verity_utils.py
index ada70e6..4a0ff09 100644
--- a/tools/releasetools/test_verity_utils.py
+++ b/tools/releasetools/test_verity_utils.py
@@ -27,8 +27,7 @@
 from test_utils import (
     get_testdata_dir, ReleaseToolsTestCase, SkipIfExternalToolsUnavailable)
 from verity_utils import (
-    CalculateVbmetaDigest, CreateHashtreeInfoGenerator,
-    CreateVerityImageBuilder, HashtreeInfo)
+    CalculateVbmetaDigest, CreateVerityImageBuilder)
 
 BLOCK_SIZE = common.BLOCK_SIZE
 
diff --git a/tools/releasetools/verity_utils.py b/tools/releasetools/verity_utils.py
index ee197e0..755241d 100644
--- a/tools/releasetools/verity_utils.py
+++ b/tools/releasetools/verity_utils.py
@@ -282,37 +282,6 @@
       raise BuildVerityImageError("Failed to add AVB footer: {}".format(output))
 
 
-class HashtreeInfoGenerationError(Exception):
-  """An Exception raised during hashtree info generation."""
-
-  def __init__(self, message):
-    Exception.__init__(self, message)
-
-
-class HashtreeInfo(object):
-  def __init__(self):
-    self.hashtree_range = None
-    self.filesystem_range = None
-    self.hash_algorithm = None
-    self.salt = None
-    self.root_hash = None
-
-
-def CreateHashtreeInfoGenerator(partition_name, block_size, info_dict):
-  return None
-
-
-class HashtreeInfoGenerator(object):
-  def Generate(self, image):
-    raise NotImplementedError
-
-  def DecomposeSparseImage(self, image):
-    raise NotImplementedError
-
-  def ValidateHashtree(self):
-    raise NotImplementedError
-
-
 def CreateCustomImageBuilder(info_dict, partition_name, partition_size,
                             key_path, algorithm, signing_args):
   builder = None