title: Python Crypto, RSA Public/Private key, with large file
body: <p>I now know that RSA Public/Private key can only encrypt very short input at once, but can anyone provide a way to encrypt any type of file(.txt, .phf, .exe, etc) with only the public/private key? I do not want to have additional AES key. </p>
  
  <p>Here is my code, I am not getting the original content back after my encryption and decryption with the pair of public &amp; private key. I do not care about how safe is my encryption or decryption, I just want the simple encrypt decrypt working on any input that it might take, no matter how long or large it is. </p>
  
  <pre><code>from Crypto.PublicKey import RSA
  from Crypto import Random
  
  
  random_generator = Random.new().read
  key = RSA.generate(1024, random_generator)
  public_key = key.publickey()
  
  f = open('C:\Users\Administrator\Desktop\jack.txt','r').read()
  
  print 'original content: '+ f
  
  enc_data = public_key.encrypt(f, 32)
  print 'encrypted data: '
  print enc_data
  
  dec_data = key.decrypt(enc_data)
  print 'decrypted data: '+ dec_data
  </code></pre>
  
  <p>Here is the output: </p>
  
  <pre><code>original content: Python Cryptography Toolkit
  
  A collection of cryptographic modules implementing various algorithms and protocols.
  
  Subpackages:
  
  Crypto.Cipher
  Secret-key (AES, DES, ARC4) and public-key encryption (RSA PKCS#1) algorithms
  Crypto.Hash
  Hashing algorithms (MD5, SHA, HMAC)
  Crypto.Protocol
  Cryptographic protocols (Chaffing, all-or-nothing transform, key derivation functions). This package does not contain any network protocols.
  Crypto.PublicKey
  Public-key encryption and signature algorithms (RSA, DSA)
  Crypto.Signature
  Public-key signature algorithms (RSA PKCS#1)
  Crypto.Util
  Various useful modules and functions (long-to-string conversion, random number generation, number theoretic functions)
  encrypted data: 
  ('\x08\xe3\x9d\x03\x1e\xe9(\xe2\xc7\xc6e\x0b5\x02\xc0\xd8G\x1f\xf5\xb8\x9cMC\x93Z\x982\xa5\x97\xec\xab4\x18\xc2\xc8\xd9\xd3\x99aX\xd96b\x19\x96\xdc\x1d|F\xe0\xa9\xa9\xea\x03\x10&gt;0g\x83\xdb\xeb\xdb\x13\x91\xc6\xd8\xf6\x95\xedE@A\x0bc\xae\xbe\xbe\xf0\xde\xcc\xcexk\x10\xb3\x86\xd3\xdd\xd0\xca@T2\x9a\x8a6ut\xb1\xaf\x07\x1f\xa2M\r\xf0D\xa2`h\xc3\x89\x18\x0e\xd4\xca\xee\xf5\xfc\x01\xed\x95}X\x1f\x13 1',)
  decrypted data: ���J�rPX �����ju�a,�xm�'�]��ٟ�?y;�)��tĹ�,�D4^�ba�8����9q
  +�i��l �q]Kd�Y���u��S�B���Ϲ�^�A3
  .7��j��m�
  �6�dl� qU
  </code></pre>