PyORAM/examples/encrypted_storage_ram.py

   1 #
   2 # This example measures the performance of encrypted
   3 # storage access through RAM.
   4 #
   5
   6 import os
   7 import random
   8 import time
   9
  10 import pyoram
  11 from pyoram.util.misc import MemorySize
  12 from pyoram.encrypted_storage.encrypted_block_storage import \
  13     EncryptedBlockStorage
  14 from pyoram.storage.block_storage_ram import \
  15     BlockStorageRAM
  16
  17 import tqdm
  18
  19 pyoram.config.SHOW_PROGRESS_BAR = True
  20
  21 # Set the storage location and size
  22 storage_name = "heap.bin"
  23 # 4KB block size
  24 block_size = 4000
  25 # one block per bucket in the
  26 # storage heap of height 8
  27 block_count = 2**(8+1)-1
  28
  29 def main():
  30
  31     print("Storage Name: %s" % (storage_name))
  32     print("Block Count: %s" % (block_count))
  33     print("Block Size: %s" % (MemorySize(block_size)))
  34     print("Total Memory: %s"
  35           % (MemorySize(block_size*block_count)))
  36     print("Actual Storage Required: %s"
  37           % (MemorySize(
  38               EncryptedBlockStorage.compute_storage_size(
  39                   block_size,
  40                   block_count,
  41                   storage_type='ram'))))
  42     print("")
  43
  44     print("Setting Up Encrypted Block Storage")
  45     setup_start = time.time()
  46     with EncryptedBlockStorage.setup(storage_name, # RAM storage ignores this argument
  47                                      block_size,
  48                                      block_count,
  49                                      storage_type='ram',
  50                                      ignore_existing=True) as f:
  51         print("Total Setup Time: %2.f s"
  52               % (time.time()-setup_start))
  53         print("Total Data Transmission: %s"
  54               % (MemorySize(f.bytes_sent + f.bytes_received)))
  55         print("")
  56
  57     # This must be done after closing the file to ensure the lock flag
  58     # is set to False in the saved data. The tofile method only exists
  59     # on BlockStorageRAM
  60     f.raw_storage.tofile(storage_name)
  61
  62     # We close the device and reopen it after
  63     # setup to reset the bytes sent and bytes
  64     # received stats.
  65     with EncryptedBlockStorage(BlockStorageRAM.fromfile(storage_name),
  66                                key=f.key) as f:
  67
  68         test_count = 1000
  69         start_time = time.time()
  70         for t in tqdm.tqdm(list(range(test_count)),
  71                            desc="Running I/O Performance Test"):
  72             f.read_block(random.randint(0,f.block_count-1))
  73         stop_time = time.time()
  74         print("Access Block Avg. Data Transmitted: %s (%.3fx)"
  75               % (MemorySize((f.bytes_sent + f.bytes_received)/float(test_count)),
  76                  (f.bytes_sent + f.bytes_received)/float(test_count)/float(block_size)))
  77         print("Access Block Avg. Latency: %.2f ms"
  78               % ((stop_time-start_time)/float(test_count)*1000))
  79         print("")
  80
  81     # cleanup because this is a test example
  82     os.remove(storage_name)
  83
  84 if __name__ == "__main__":
  85     main()                                             # pragma: no cover