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"l=J*e8p@ţ h4:52  l=J*e8p@)F 0   h input:b0019v0000p0001e0000-e0,1,k74,ramlsfw " lz Jj"Tʂ ^)F | g# # -*- coding: utf-8 -*- # # Cipher/PKCS1-v1_5.py : PKCS#1 v1.5 # # =================================================================== # The contents of this file are dedicated to the public domain. To # the extent that dedication to the public domain is not available, # everyone is granted a worldwide, perpetual, royalty-free, # non-exclusive license to exercise all rights associated with the # contents of this file for any purpose whatsoever. # No rights are reserved. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS # BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN # ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN # CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE # SOFTWARE. # =================================================================== """RSA encryption protocol according to PKCS#1 v1.5 See RFC3447__ or the `original RSA Labs specification`__ . This scheme is more properly called ``RSAES-PKCS1-v1_5``. **If you are designing a new protocol, consider using the more robust PKCS#1 OAEP.** As an example, a sender may encrypt a message in this way: >>> from Crypto.Cipher import PKCS1_v1_5 >>> from Crypto.PublicKey import RSA >>> from Crypto.Hash import SHA >>> >>> message = 'To be encrypted' >>> h = SHA.new(message) >>> >>> key = RSA.importKey(open('pubkey.der').read()) >>> cipher = PKCS1_v1_5.new(key) >>> ciphertext = cipher.encrypt(message+h.digest()) At the receiver side, decryption can be done using the private part of the RSA key: >>> From Crypto.Hash import SHA >>> from Crypto import Random >>> >>> key = RSA.importKey(open('privkey.der').read()) >>> >>> dsize = SHA.digest_size >>> sentinel = Random.new().read(15+dsize) # Let's assume that average data length is 15 >>> >>> cipher = PKCS1_v1_5.new(key) >>> message = cipher.decrypt(ciphertext, sentinel) >>> >>> digest = SHA.new(message[:-dsize]).digest() >>> if digest==message[-dsize:]: # Note how we DO NOT look for the sentinel >>> print "Encryption was correct." >>> else: >>> print "Encryption was not correct." :undocumented: __revision__, __package__ .. __: http://www.ietf.org/rfc/rfc3447.txt .. __: http://www.rsa.com/rsalabs/node.asp?id=2125. """ __revision__ = "$Id$" __all__ = [ 'new', 'PKCS115_Cipher' ] from Crypto.Util.number import ceil_div from Crypto.Util.py3compat import * import Crypto.Util.number class PKCS115_Cipher: """This cipher can perform PKCS#1 v1.5 RSA encryption or decryption.""" def __init__(self, key): """Initialize this PKCS#1 v1.5 cipher object. :Parameters: key : an RSA key object