code: def validatepubkey(pub):
      '''
      Returns input key if it's a valid hex public key, or False
      otherwise.
  
      Input must be hex string, not bytes or integer/long or anything
      else.
      '''
  
      try:
          pub = hexstrlify(unhexlify(pub))
      except:
          return False
      if len(pub) == 130:
          if pub[:2] != '04':
              return False
          if uncompress(compress(pub)) != pub:
              return False
      elif len(pub) == 66:
          if pub[:2] != '02' and pub[:2] != '03':
              return False
      else:
          return False
      return puf validatepubkey(pub):
      '''
      Returns input key if it's a valid hex public key, or False
      otherwise.
  
      Input must be hex string, not bytes or integer/long or anything
      else.
      '''
  
      try:
          pub = hexstrlify(unhexlify(pub))
      except:
          return False
      if len(pub) == 130:
          if pub[:2] != '04':
              return False
          if uncompress(compress(pub)) != pub:
              return False
      elif len(pub) == 66:
          if pub[:2] != '02' and pub[:2] != '03':
              return False
      else:
          return False
      return pub
docs: Returns input key if it's a valid hex public key, or False
      otherwise.
  
      Input must be hex string, not bytes or integer/long or anything
      else.