code: def validate_pwhash(_self, params):
      
      pwhash, nonce, aead, key_handle = get_pwhash_bits(params)
      d_aead = aead.decode('hex')
      plaintext_len = len(d_aead) - pyhsm.defines.YSM_AEAD_MAC_SIZE
      pw = pwhash.ljust(plaintext_len, chr(0x0))
      if hsm.validate_aead(nonce.decode('hex'), key_handle, d_aead, pw):
          return "OK pwhash validated"
      return "ERR Could not validate pwhash"
docs: Validate password hash using YubiHSM.