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* raise ValueError on zero length GCM IV (#4348)Paul Kehrer2018-07-171-0/+2
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* disallow implicit tag truncation with finalize_with_tag (#4342)Paul Kehrer2018-07-171-0/+1
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* Change the exception we raise in keywrap unwrapping on invalid length (#4337)Alex Gaynor2018-07-161-3/+3
| | | I believe this can reasonably be considered backwards compatible since other invalid inputs already lead to InvalidUnwrap, and clients shouldn't be distinguishing between these two conditions, and ValueError wasn't documented anyways.
* document one shot AEAD length restrictions (#4322)Paul Kehrer2018-07-141-0/+24
| | | | | | | | | | | | | | * document one shot AEAD length restrictions * write a test that won't consume infinity ram continue to raise OverflowError since that's what cffi did. * this applies to associated_data too * remove unneeded arg * review feedback on docs
* since the generator order is 570 bits this should be 570 (#4307)Paul Kehrer2018-07-041-1/+1
| | | but key_size is nonsense and we'll deprecate it next
* Add clearer message when key type is not bytes (#4289)Vladyslav Moisieienkov2018-06-201-0/+3
| | | | | | | | | | | | * Add clearer message in Cipher when key is not bytes * Change location of key type check to verify_key_size function * Replace formated error message with static * Add key type check tests to all ciphers constructors * Change key type error message to lowercase
* deprecate pythons without hmac.compare_digest (#4261)Paul Kehrer2018-05-241-0/+9
| | | | | | * deprecate the constant time bytes comparison path old python 2.7.x uses * pep8
* remove block size as a required part of HashAlgorithm (#4249)Paul Kehrer2018-05-161-6/+0
| | | | | | Internal block size isn't a particularly useful piece of information and constructions like SHA3 make it even harder to determine what that really means. Accordingly, we're removing it from the interface (but leaving it on all existing hashes)
* fix bug with n % 8 length wrapping on AESKWP (#4160)Paul Kehrer2018-03-201-2/+7
| | | | | | * fix bug with n % 8 length wrapping on AESKWP * review feedback
* implement AES KW with padding (RFC 5649) (#3880)Paul Kehrer2018-03-181-0/+57
| | | | | | | | | | | | | | | | | | * implement AES KW with padding (RFC 5649) fixes #3791 * oops, 2.2 * make sure this is the right valueerror * more match * make key padding easier to read * review feedback * review feedback
* Allow DSA q=224 (#4147)Paul Kehrer2018-03-181-2/+2
| | | | | | | | * load Q=224 vectors * DSA parameters should support 224 for q length * oxford comma
* Brainpool curves (#4129)Paul Kehrer2018-03-151-0/+22
| | | | | | | | | | | | | | | | | | * added brainpool ec-curves key_length >= 256bit * limit brainpool curves to the set that appear required + docs * oops * typos all around me * add brainpool ECDH kex tests * switch to using rfc 7027 vectors * review feedback * empty commits are the best
* The HKDF limit is actually 255 * digest_length_in_bytes (#4037)Paul Kehrer2018-01-061-1/+1
| | | | | | | | | | | * The HKDF limit is actually 255 * digest_length_in_bytes Previously we had a bug where we divided digest_size by 8...but HashAlgorithm.digest_size is already in bytes. * test longer output * changelog
* Pass the right length of null bytes when no salt is provided to HKDF (#4036)Paul Kehrer2017-12-011-1/+1
| | | | | | This bug looks bad but ends up being benign because HMAC is specified to pad null bytes if a key is too short. So we passed too few bytes and then OpenSSL obligingly padded it out to the correct length. However, we should still do the right thing obviously.
* Latest flake8 has some rules about variable names (#3996)Alex Gaynor2017-10-232-4/+4
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* Inline calls to bit_length now that it's trivial (#3966)Alex Gaynor2017-10-121-2/+2
| | | | | | | | * Inline calls to bit_length now that it's trivial * unused imports * An comment
* Add support for AES XTS (#3900)Paul Kehrer2017-10-012-8/+54
| | | | | | | | | | | | | | | | | | | | | | | | * Add support for AES XTS We drop the non-byte aligned test vectors because according to NIST http://csrc.nist.gov/groups/STM/cavp/documents/aes/XTSVS.pdf "An implementation may support a data unit length that is not a multiple of 8 bits." OpenSSL does not support this, so we can't use those test vectors. * fix docs and pep8 * docs fix * the spellchecker is so frustrating * add note about AES 192 for XTS (it's not supported) * docs work * enforce key length on ECB mode in AES as well (thanks XTS) * a few more words about why we exclude some test vectors for XTS
* add ChaCha20 support (#3919)Paul Kehrer2017-09-281-0/+24
| | | | | | | | | | * add ChaCha20 support * review feedback * 256 divided by 8 is what again? * ...
* refactor AES keywrap into a wrap core and unwrap core (#3901)Paul Kehrer2017-09-111-23/+30
| | | | | | | | * refactor AES keywrap into a wrap core and unwrap core This refactor makes adding AES keywrap with padding much simpler. * remove an unneeded arg
* remove deprecated items (#3794)Paul Kehrer2017-07-202-47/+0
| | | | | | | | | | * remove deprecated items whirlpool, ripemd160, unsupportedextension, and the old interfaces * flake8 and remove a test generator we no longe use * make it clear we warned you about these things
* Remove DH generator size constraint (#3364)mtury2017-07-171-2/+2
| | | | | | * Remove DH generator size constraint * Check that g > 1
* add AESGCM AEAD support (#3785)Paul Kehrer2017-07-171-0/+42
| | | | | | | | * add AESGCM AEAD support * remove stray newline * move AESGCM docs above CCM
* move tag_length to the AESCCM constructor (#3783)Paul Kehrer2017-07-161-14/+16
| | | | | | * move tag_length to the AESCCM constructor * review feedback
* AESCCM support (#3700)Paul Kehrer2017-07-161-0/+63
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* use an instance in aead_cipher_supported (#3772)Paul Kehrer2017-07-091-3/+3
| | | | | | | | * use an instance in aead_cipher_supported * test for chacha20poly1305 compatibility via init exception * pep8
* stop using backend methods for chacha (#3765)Paul Kehrer2017-07-081-4/+5
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* change chacha20poly1305_supported to aead_cipher_supported (#3762)Paul Kehrer2017-07-081-1/+1
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* Reorganize DHParameters and DHPublicKey *WithSerialization (#3722)Paul Kehrer2017-06-241-6/+6
| | | | | | | | * Reorganize DHParameters and DHPublicKey *WithSerialization fixes #3720 * fix up the changelog
* add missing methods to DH interfaces (#3719)Paul Kehrer2017-06-241-0/+18
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* Dh parameters serialization (#3504)Aviv Palivoda2017-06-241-0/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * Support DH parameter serizalization - no X9.42 * Support X9.42 serialization - DER not working * Fix dhp_rfc5114_2.der Changing the DER parameters serialization after the fix in openssl commit a292c9f1b835 * DH parameters X9.42 DER serialization fixed * fix _skip_dhx_unsupported * document DH parameter_bytes * PEP8 fixes * Document load_pem_parameters * Document load_der_parameters * document ParameterFormat * Increase test coverage * Increase test covrage * Remove unneeded check * Fix typo * Fix error in load_der_parameters * Add load_pem_parameters and load_der_parameters to interfaces * CR fixes * Removed unverified phrase * Update version to 2.0 * Fix pep8 * Rename ParameterFormat.ASN1 to ParameterFormat.DHParameter * link pkcs3 * Add new line at end of file to serialization.rst * Rename DHparameters to PKCS3 * doc CR fix
* X25519 Support (#3686)Paul Kehrer2017-06-091-0/+54
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * early days * sort of working * more things * remove private_bytes * public bytes, interface fix * load public keys * x25519 support basically done now * private_bytes is gone * some reminders * doctest this too * remove a thing that doesn't matter * x25519 supported checks * libressl has the NID, but a different API, so check for OpenSSL * pep8 * add missing coverage * update to use reasons * expand test a little * add changelog entry * review feedback
* ChaCha20Poly1305 support (#3680)Paul Kehrer2017-06-081-0/+54
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * chacha20poly1305 support * add chacha20poly1305 backend and some fixes * refactor * forgot to remove this * pep8 * review feedback and a lot of type/value checking * review feedback * raise unsupportedalgorithm when creating a ChaCha20Poly1305 object if it's not supported. * switch to ciphertext||tag * typo * remove a branch we don't need * review feedback * decrypts is *also* a word * use reasons
* move MACContext to mac.py and eliminate interfaces.py (#3631)Paul Kehrer2017-05-294-4/+21
| | | | | | | | | | | | | * move MACContext to mac.py and eliminate interfaces.py finally * improve title * re-add and deprecate interfaces.MACContext * use pytest.warns instead of deprecated_call The pytest docs insist that deprecation warnings are handled differently and that you should use deprecated_call, but this works so okay then
* Put the exchange method on the correct interface (#3591)Alex Gaynor2017-05-241-7/+7
| | | | | | * Put the exchange method on the correct interface * fixed links in docs
* add convenience methods for key_size on EC{Public,Private}Key (#3587)Paul Kehrer2017-05-231-1/+13
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* Bump the minimum PyPy/cffi version and simplify as a result (#3585)Alex Gaynor2017-05-231-27/+7
| | | | | | | | * Bump the minimum PyPy/cffi version and simplify as a result * unused imports * grumble, fix
* let's deprecate some hashes we should never have exposed (#3584)Paul Kehrer2017-05-231-0/+16
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* Fix deprecation warning (#3574)Alex Gaynor2017-05-231-1/+5
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* Fixed #3533 -- made GCM mode object immutable (#3553)Alex Gaynor2017-05-203-16/+9
| | | | | | | | | | | | | | | | | | | | | | | | * Fixed #3533 -- made GCM mode object immutable * flake8 * Fix for older openssl * fix * fix * sigh, fix * fixed * dropped negation * computers are bad * A test * This implements an interface
* use openssl constants (#3534)Paul Kehrer2017-05-031-2/+5
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* postpone GCM authentication tag requirement until finalization (#3421)Philipp Gesang2017-05-022-17/+34
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * postpone GCM authentication tag requirement until finalization Add a .finalize_with_tag() variant of the .finalize() function of the GCM context. At the same time, do not enforce the requirement of supplying the tag with the mode ctor. This facilitates streamed decryption when the MAC is appended to the ciphertext and cannot be efficiently retrieved ahead of decryption. According to the GCM spec (section 7.2: “Algorithm for the Authenticated Decryption Function”), the tag itself is not needed until the ciphertext has been decrypted. Addresses #3380 Signed-off-by: Philipp Gesang <philipp.gesang@intra2net.com> * disallow delayed GCM tag passing for legacy OpenSSL Old versions of Ubuntu supported by Cryptography ship a v1.0.1 of OpenSSL which is no longer supported by upstream. This library seems to cause erratic test failures with the delayed GCM tag functionality which are not reproducible outside the CI. Unfortunately OpenSSL v1.0.1 does not even document the required API (``EVP_EncryptInit(3)``) so there is no by-the-book fix. For backends of version 1.0.1 and earlier, verify the GCM tag at the same stage as before. Also, indicate to the user that late passing of GCM tags is unsupported by throwing ``NotImplementedError`` for these backend versions if - the method ``finalize_with_tag()`` is invoked, or - the mode ctor is called without passing a tag. Unit tests have been adapted to account for different backend versions.
* Don't compare cffi version using strings (#3524)Alex Gaynor2017-04-291-2/+2
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* Remove API deprecated in 1.6, clean up the legacy deprecations (#3468)Alex Gaynor2017-03-211-2/+2
| | | | | | * Remove API deprecated in 1.6, clean up the legacy deprecations * flake8, unused import
* DH subgroup order (q) (#3369)Aviv Palivoda2017-03-051-3/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * Support DH q (subgroup order) * Change RFC5114.txt to NIST format * Add tests for DH q * Update docs for DH q * Fix pep8 * Improve test covergae for DH q * Create _dh_params_dup that copy q if DHparams_dup don't On OpenSSL < 1.0.2 DHparams_dup don't copy q. _dh_params_dup call DHparams_dup and if the version is smaller than 1.0.2 copy q manually * Copy q manually on libressl * Add to test vectors serialized RFC5114 2048 bit DH parameters with 224 bit subgroup * Support serialization of DH with q * Add tests for serialization of DH with q * Support DH serialization with q only if Cryptography_HAS_EVP_PKEY_DHX is true * Raise exception when trying to serialize DH X9.42 when not supported * raise unsupported key type when deserilizing DH X9.42 if not supported * pep8 fixes * Fix test_serialization * Add dhx_serialization_supported method to DHBacked * document q in dh_parameters_supported * Rename dhx_serialization_supported to dh_x942_serialization_supported
* add support for update_into on CipherContext (#3190)Paul Kehrer2017-02-161-2/+40
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * add support for update_into on CipherContext This allows you to provide your own buffer (like recv_into) to improve performance when repeatedly calling encrypt/decrypt on large payloads. * another skip_if * more skip_if complexity * maybe do this right * correct number of args * coverage for the coverage gods * add a cffi minimum test tox target and travis builder This tests against macOS so we capture some commoncrypto branches * extra arg * need to actually install py35 * fix * coverage for GCM decrypt in CC * no longer relevant * 1.8 now * pep8 * dramatically simplify * update docs * remove unneeded test * changelog entry * test improvements * coverage fix * add some comments to example * move the comments to their own line * fix and move comment
* replace pyasn1 with asn1crypto (#3361)Ofek Lev2017-02-081-27/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | * replace pyasn1 with asn1crypto * allow trailing bytes * fix x509 test * update CHANGELOG.rst * fix assert * make asn1crypto code more idiomatic * find tag * final clean-up * leave trailing byte logic unchanged * document dependency change * spelling * fix spelling
* add memory limit check for scrypt (#3328)Paul Kehrer2017-01-051-0/+7
| | | | | | | | | | * add memory limit check for scrypt fixes #3323 * test a pass * move _MEM_LIMIT to the scrypt module
* OpenSSL DH backend implementation [Second attempt] (#2914)Aviv Palivoda2016-11-261-0/+23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * Start of OpenSSL DH backend implementation * Supporting DH in MultiBackend * DHBackend has dh_parameters_supported method * Removed DHParametersWithNumbers and DHPrivateKeyWithNumbers from documentation * Removed ExchangeContext. exchange is a method of DHPrivateKeyWithSerialization * PEP8 fixes * Fixed TestDH.test_bad_tls_exchange * Fixed generate_private_key reference in dh documentation * test DH multibackend support * testing DH coversion to serialized * Validating that we receive serialized class in test_generate_dh * Testing DH exchange symmetric key padding * struct DH is now opaqued * PEP8 fixes * Testing load_dh_private_numbers throws ValueError when DH_check fails * Using openssl_assert * Passing keywords arguments in DH key exchange example * test_dh::test_bad_tls_exchange now uses pre calculated parameters * TestDH - Add test that the computed secret is equivalent to the definition by comparing with secret computed in pure python * Add missing generator parameter to DHBackend interface docs. * Include parameter type in DHBackend abc docs. * Add docs for dh.generate_parameters function * Remove the dh Numbers section, and move the DHNumbers class docs to where they are first used. * Add note of big endian byte packing to DH exchange method. * DH documentation updates. Add single sentence overview with wikipedia link. Add paragraph on assembling using Numbers objects. Add link to backend interface docs. First section was all indented, I think by mistake. * Add exchange method to DHPrivateKey abstract base class. * Small tweaks to DH documentation - remove Provider. * Add endian to dictionary * Use utils.int_from_bytes in test_tls_exchange_algorithm * Removed duplicate line * Change dh.rst exchange algorithm from doctest to code-block The example in the Diffie-Hellman exhange algorithm is using 2048 bits key. Generating the parameters of 2048 takes long time. This caused the automated tests to fail. In order to pass the tests we change the example to code-block so it will not run in the doc tests. * Fix dh docs * Document the generator in DHBackend relevant methods * Fix dh tests * use DHparams_dup * Fix key type to unsigned char as expected by DH_compute_key * Validate that DH generator is 2 or 5 * test dh exchange using botan vectors * group all numbers classes * Simplify _DHPrivateKey * Rename test with serialized to numbers * Move bad exchange params to external vector file * update exchange versionadded to 1.7 * Make key_size bit accurate * Change botan link * Added CHANGELOG entry
* error if private_value is <= 0 in ec.derive_private_key (#3273)Paul Kehrer2016-11-211-0/+3
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* support prehashing in RSA sign (#3238)Paul Kehrer2016-11-201-0/+12
| | | | | | | | * support prehashing in RSA sign * check to make sure digest size matches prehashed data provided * move doctest for prehashed
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