Avg Release Cycle
3172 days ago
v2.7a1October 21, 2013
* Experimental release. This introduces a new API for AEAD modes, and makes a few other minor API changes. These APIs should be considered experimental, and may be changed before the final release. * New API for authenticated encryption with associated data (AEAD): - New block cipher modes: - MODE_CCM - MODE_EAX - MODE_GCM - MODE_SIV - New methods: - .encrypt_and_digest() - .decrypt_and_verify() - .digest() - .verify() - New MAC algorithm: - Crypto.Cipher.CMAC - New .verify() and .hexverify() methods also added to Hash and HMAC/CMAC objects, providing constant-time hash comparison. (Thanks: Legrandin, Lucas Garron) * LP#1132550: Fix MODE_OPENPGP not accepting uppercase 'IV' kwarg. * LP#1119552: Fix PKCS#1v1.5 not accepting signatures without the optional NULL parameter * Add support for import/export of DSA keys. (Thanks: Legrandin) * Add support for PKCS#8-encrypted private keys. (Thanks: Legrandin) * LP#996193: Fix MODE_OFB requiring padding (it now behaves as a stream cipher) * Improve C extension autodocs * Remove pointless 'error' attribute from stream ciphers. * Deprecate the disable_shortcut option to Crypto.Util.Counter; Remove __PCT_CTR_SHORTCUT__ entirely. * Fix small MODE_CTR memory leak under Python 3. * Fix error importing winrandom on Python 3. (Thanks: Jason R. Coombs) * FortunaAccumulator: Use time.monotonic for rate-limiting if available (i.e. Python 3.3 and later) * AES-NI support (Thanks: Sebastian Ramacher) * setup.py: Fix compilation on HP-UX 11.31. (Thanks: Adam Woodbeck) * ElGamal: Add blinding to ElGamal decryption. (Thanks: Legrandin) * Hash: Remove pure-Python wrappers (speeds up hash init 4x-7x) * Hash: Add generic Crypto.Hash.new(algo, [data]) function (like hashlib.new) * Hash: Remove 'oid' attributes; Add 'name' attributes for compatibility with hashlib. * Hash: Rename SHA -> SHA1 and RIPEMD -> RIPEMD160, since the original names are frequently used as the names of other algorithms. * setup.py: Use autoconf to generate compiler options; Fix OpenBSD build issues. * Fix RSA object serialization (i.e. pickle) * LP#1061217: random.shuffle takes O(n^2) time. (Thanks: Sujay Jayakar, Andrew Cooke) * _fastmath: Fix leaks when errors occur. (Thanks: Sebastian Ramacher, Andreas Stührk) * SHA256/224/384/512: Don't export symbol 'add_length' * setup.py: Use os.chmod instead of os.system("chmod ..."). (Thanks: Sebastian Ramacher) * setup.py: The 'test' command now runs the 'build' command first. (Thanks: Sebastian Ramacher) * New tools/create-pythons.sh and tools/test-all.sh scripts for testing against multiple versions of Python. * getStrongProne: Fix error handling (Thanks: Sebastian Ramacher) * ARC4: Add ARC4-drop[n] cipher support. (Thanks: Legrandin) * RSA.importKey: Properly catch IndexError. (Thanks: Sebastian Ramacher) * RSA.exportKey: Raise ValueError as documented when key format is unknown. (Thanks: Sebastian Ramacher) * RSA.exportKey: Always return bytes (Thanks: Sebastian Ramacher) * Fix & re-enable some broken tests (Thanks: Sebastian Ramacher) * Improve Python 3 compatibility * Various documentation fixes and improvements (Thanks: Anton Rieder, Legrandin, Sebastian Ramacher, Stefano Rivera) * Various cleanups, especially for Python 3.
* [CVE-2013-1445] Fix PRNG not correctly reseeded in some situations. In previous versions of PyCrypto, the Crypto.Random PRNG exhibits a race condition that may cause forked processes to generate identical sequences of 'random' numbers. This is a fairly obscure bug that will (hopefully) not affect many applications, but the failure scenario is pretty bad. Here is some sample code that illustrates the problem: from binascii import hexlify import multiprocessing, pprint, time import Crypto.Random def task_main(arg): a = Crypto.Random.get_random_bytes(8) time.sleep(0.1) b = Crypto.Random.get_random_bytes(8) rdy, ack = arg rdy.set() ack.wait() return "%s,%s" % (hexlify(a).decode(), hexlify(b).decode()) n_procs = 4 manager = multiprocessing.Manager() rdys = [manager.Event() for i in range(n_procs)] acks = [manager.Event() for i in range(n_procs)] Crypto.Random.get_random_bytes(1) pool = multiprocessing.Pool(processes=n_procs, initializer=Crypto.Random.atfork) res_async = pool.map_async(task_main, zip(rdys, acks)) pool.close() [rdy.wait() for rdy in rdys] [ack.set() for ack in acks] res = res_async.get() pprint.pprint(sorted(res)) pool.join() The output should be random, but it looked like this: ['c607803ae01aa8c0,2e4de6457a304b34', 'c607803ae01aa8c0,af80d08942b4c987', 'c607803ae01aa8c0,b0e4c0853de927c4', 'c607803ae01aa8c0,f0362585b3fceba4'] This release fixes the problem by resetting the rate-limiter when Crypto.Random.atfork() is invoked. It also adds some tests and a few related comments.
* [CVE-2012-2417] Fix LP#985164: insecure ElGamal key generation. (thanks: Legrandin) In the ElGamal schemes (for both encryption and signatures), g is supposed to be the generator of the entire Z^*_p group. However, in PyCrypto 2.5 and earlier, g is more simply the generator of a random sub-group of Z^*_p. The result is that the signature space (when the key is used for signing) or the public key space (when the key is used for encryption) may be greatly reduced from its expected size of log(p) bits, possibly down to 1 bit (the worst case if the order of g is 2). While it has not been confirmed, it has also been suggested that an attacker might be able to use this fact to determine the private key. Anyone using ElGamal keys should generate new keys as soon as practical. Any additional information about this bug will be tracked at https://bugs.launchpad.net/pycrypto/+bug/985164 * Huge documentation cleanup (thanks: Legrandin). * Added more tests, including test vectors from NIST 800-38A (thanks: Legrandin) * Remove broken MODE_PGP, which never actually worked properly. A new mode, MODE_OPENPGP, has been added for people wishing to write OpenPGP implementations. Note that this does not implement the full OpenPGP specification, only the "OpenPGP CFB mode" part of that specification. https://bugs.launchpad.net/pycrypto/+bug/996814 * Fix: getPrime with invalid input causes Python to abort with fatal error https://bugs.launchpad.net/pycrypto/+bug/988431 * Fix: Segfaults within error-handling paths (thanks: Paul Howarth & Dave Malcolm) https://bugs.launchpad.net/pycrypto/+bug/934294 * Fix: Block ciphers allow empty string as IV https://bugs.launchpad.net/pycrypto/+bug/997464 * Fix DevURandomRNG to work with Python3's new I/O stack. (thanks: Sebastian Ramacher) * Remove automagic dependencies on libgmp and libmpir, let the caller disable them using args. * Many other minor bug fixes and improvements (mostly thanks to Legrandin)
* Added PKCS#1 encryption schemes (v1.5 and OAEP). We now have a decent, easy-to-use non-textbook RSA implementation. Yay! * Added PKCS#1 signature schemes (v1.5 and PSS). v1.5 required some extensive changes to Hash modules to contain the algorithm specific ASN.1 OID. To that end, we now always have a (thin) Python module to hide the one in pure C. * Added 2 standard Key Derivation Functions (PBKDF1 and PBKDF2). * Added export/import of RSA keys in OpenSSH and PKCS#8 formats. * Added password-protected export/import of RSA keys (one old method for PKCS#8 PEM only). * Added ability to generate RSA key pairs with configurable public exponent e. * Added ability to construct an RSA key pair even if only the private exponent d is known, and not p and q. * Added SHA-2 C source code (fully from Lorenz Quack). * Unit tests for all the above. * Updates to documentation (both inline and in Doc/pycrypt.rst) * All of the above changes were put together by Legrandin (Thanks!) * Minor bug fixes (setup.py and tests).
v2.6May 24, 2012
v2.5January 13, 2012
* Fix "error: Setup script exited with error: src/config.h: No such file or directory" when installing via easy_install. (Sebastian Ramacher)
* Python 3 support! (Thorsten E. Behrens, Anders Sundman) PyCrypto now supports every version of Python from 2.1 through 3.2. * Timing-attack countermeasures in _fastmath: When built against libgmp version 5 or later, we use mpz_powm_sec instead of mpz_powm. This should prevent the timing attack described by Geremy Condra at PyCon 2011: http://blip.tv/pycon-us-videos-2009-2010-2011/pycon-2011-through-the-side-channel-timing-and-implementation-attacks-in-python-4897955 * New hash modules (for Python >= 2.5 only): SHA224, SHA384, and SHA512 (Frédéric Bertolus) * Configuration using GNU autoconf. This should help fix a bunch of build issues. * Support using MPIR as an alternative to GMP. * Improve the test command in setup.py, by allowing tests to be performed on a single sub-package or module only. (Legrandin) You can now do something like this: python setup.py test -m Hash.SHA256 --skip-slow-tests * Fix double-decref of "counter" when Cipher object initialisation fails (Ryan Kelly) * Apply patches from Debian's python-crypto 2.3-3 package (Jan Dittberner, Sebastian Ramacher): - fix-RSA-generate-exception.patch - epydoc-exclude-introspect.patch - no-usr-local.patch * Fix launchpad bug #702835: "Import key code is not compatible with GMP library" (Legrandin) * More tests, better documentation, various bugfixes.
* Fix NameError when attempting to use deprecated getRandomNumber() function. * _slowmath: Compute RSA u parameter when it's not given to RSA.construct. This makes _slowmath behave the same as _fastmath in this regard. * Make RSA.generate raise a more user-friendly exception message when the user tries to generate a bogus-length key.
* Deprecated Crypto.Util.number.getRandomNumber(), which had confusing semantics. It's been replaced by getRandomNBitInteger and getRandomInteger. (Thanks: Lorenz Quack) * Better isPrime() and getPrime() implementations that do a real Rabin-Miller probabilistic primality test (not the phony test we did before with fixed bases). (Thanks: Lorenz Quack) * getStrongPrime() implementation for generating RSA primes. (Thanks: Lorenz Quack) * Support for importing and exporting RSA keys in DER and PEM format. (Thanks: Legrandin) * Fix PyCrypto when floor division (python -Qnew) is enabled. * When building using gcc, use -std=c99 for compilation. This should fix building on FreeBSD and NetBSD.
v2.4October 22, 2011
v2.3August 27, 2010
v2.2August 27, 2010
* Fix building PyCrypto on Win64 using MS Visual Studio 9. (Thanks: Nevins Bartolomeo.)