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I suggest to just change MD5 to SHA1. It's not that important to provide multiple choices of hash algorithms.
(1) The hash function is used internally and not exposed to end-users.
(2) A stable and secure hash algorithm can deal with the situation very well.

According to the security and performance, SHA1 is the promisinig trade-
off algorithm and it is also widely used in thousands of production-
ready systems.

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https://bugs.launchpad.net/bugs/1174499

Title:
  Keystone token hashing is MD5

Status in OpenStack Identity (Keystone):
  In Progress

Bug description:
  https://github.com/openstack/python-
  keystoneclient/blob/master/keystoneclient/common/cms.py

  def cms_hash_token(token_id):
      """
  return: for ans1_token, returns the hash of the passed in token
  otherwise, returns what it was passed in.
  """
      if token_id is None:
          return None
      if is_ans1_token(token_id):
          hasher = hashlib.md5()
          hasher.update(token_id)
          return hasher.hexdigest()
      else:
          return token_id

  
  MD5 is a deprecated mechanism, it should be replaces with at least SHA1, if not SHA256.
  Keystone should be able to support multiple Hash types, and the auth_token middleware should query Keystone to find out which type is in use.

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