2.6
===
* [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)
Upstream changes:
2.5
===
* 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).
upstream Changelog:
2.4.1
=====
* Fix "error: Setup script exited with error: src/config.h: No such file or
directory" when installing via easy_install. (Sebastian Ramacher)
2.4
===
* 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.
pkgsrc changes:
- add a patch to fix an hardcoded interpreter path
- add a patch to actually find gmp library.
- add CONFLICTS with py-amkCrypto, both have files in common.
upstream changes:
2.3
===
* 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.
2.2
===
* 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.
