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Changelog

X.X.X (X XXX 2021)

Resolved issues

  • GH#376: Fixed symbol conflict between different versions of libgmp.

New features

  • Added support for SHA-3 hash functions to HMAC.

3.10.1 (9 February 2021)

Other changes

  • Python 3 wheels use abi3 ABI tag.
  • Remove Appveyor CI.

3.10.0 (6 February 2021)

Resolved issues

  • Fixed a potential memory leak when initializing block ciphers.
  • GH#466: Crypto.Math.miller_rabin_test() was still using the system random source and not the one provided as parameter.
  • GH#469: RSA objects have the method public_key() like ECC objects. The old method publickey() is still available for backward compatibility.
  • GH#476: Crypto.Util.Padding.unpad() was raising an incorrect exception in case of zero-length inputs. Thanks to Captainowie.
  • GH#491: better exception message when Counter.new() is called with an integer initial_value than doesn't fit into nbits bits.
  • GH#496: added missing block_size member for ECB cipher objects. Thanks to willem.
  • GH#500: nonce member of an XChaCha20 cipher object was not matching the original nonce. Thanks to Charles Machalow.

Other changes

  • The bulk of the test vectors have been moved to the separate package pycryptodome-test-vectors. As result, packages pycryptodome and pycryptodomex become significantly smaller (from 14MB to 3MB).
  • Moved CI tests and build service from Travis CI to GitHub Actions.

Breaks in compatibility

  • Drop support for Python 2.6 and 3.4.

3.9.9 (2 November 2020)

Resolved issues

  • GH#435: Fixed Crypto.Util.number.size for negative numbers.

New features

  • Build Python 3.9 wheels on Windows.

3.9.8 (23 June 2020)

Resolved issues

  • GH#426: The Shamir's secret sharing implementation is not actually compatible with ssss. Added an optional parameter to enable interoperability.
  • GH#427: Skip altogether loading of gmp.dll on Windows.
  • GH#420: Fix incorrect CFB decryption when the input and the output are the same buffer.

New features

  • Speed up Shamir's secret sharing routines. Thanks to ncarve.

3.9.7 (20 February 2020)

Resolved issues

  • GH#381: Make notarization possible again on OS X when using wheels. Thanks to Colin Atkinson.

3.9.6 (2 February 2020)

Resolved issues

  • Fix building of wheels for OS X by explicitly setting sysroot location.

3.9.5 (1 February 2020)

Resolved issues

  • RSA OAEP decryption was not verifying that all PS bytes are zero.
  • GH#372: fixed memory leak for operations that use memoryviews when cffi is not installed.
  • Fixed wrong ASN.1 OID for HMAC-SHA512 in PBE2.

New features

  • Updated Wycheproof test vectors to version 0.8r12.

3.9.4 (18 November 2019)

Resolved issues

  • GH#341: Prevent key_to_english from creating invalid data when fed with keys of length not multiple of 8. Thanks to vstoykovbg.
  • GH#347: Fix blocking RSA signing/decryption when key has very small factor. Thanks to Martijn Pieters.

3.9.3 (12 November 2019)

Resolved issues

  • GH#308: Align stack of functions using SSE2 intrinsics to avoid crashes, when compiled with gcc on 32-bit x86 platforms.

3.9.2 (10 November 2019)

New features

  • Add Python 3.8 wheels for Mac.

Resolved issues

  • GH#308: Avoid allocating arrays of __m128i on the stack, to cope with buggy compilers.
  • GH#322: Remove blanket -O3 optimization for gcc and clang, to cope with buggy compilers.
  • GH#337: Fix typing stubs for signatures.
  • GH#338: Deal with gcc installations that don't have x86intrin.h.

3.9.1 (1 November 2019)

New features

  • Add Python 3.8 wheels for Linux and Windows.

Resolved issues

  • GH#328: minor speed-up when importing RSA.

3.9.0 (27 August 2019)

New features

  • Add support for loading PEM files encrypted with AES256-CBC.
  • Add support for XChaCha20 and XChaCha20-Poly1305 ciphers.
  • Add support for bcrypt key derivation function (Crypto.Protocol.KDF.bcrypt).
  • Add support for left multiplication of an EC point by a scalar.
  • Add support for importing ECC and RSA keys in the new OpenSSH format.

Resolved issues

  • GH#312: it was not possible to invert an EC point anymore.
  • GH#316: fix printing of DSA keys.
  • GH#317: DSA.generate() was not always using the randfunc input.
  • GH#285: the MD2 hash had block size of 64 bytes instead of 16; as result the HMAC construction gave incorrect results.

3.8.2 (30 May 2019)

Resolved issues

  • GH#291: fix strict aliasing problem, emerged with GCC 9.1.

3.8.1 (4 April 2019)

New features

  • Add support for loading PEM files encrypted with AES192-CBC and AES256-GCM.
  • When importing ECC keys in PEM format, ignore the redundant EC PARAMS section that was included by certain openssl commands.

Resolved issues

  • repr() did not work for ECC.EccKey objects.
  • Fix installation in development mode (setup install develop or pip install -e .).
  • Minimal length for Blowfish cipher is 32 bits, not 40 bits.
  • Various updates to docs.

3.8.0 (23 March 2019)

New features

  • Speed-up ECC performance. ECDSA is 33 times faster on the NIST P-256 curve.
  • Added support for NIST P-384 and P-521 curves.
  • EccKey has new methods size_in_bits() and size_in_bytes().
  • Support HMAC-SHA224, HMAC-SHA256, HMAC-SHA384, and HMAC-SHA512 in PBE2/PBKDF2.

Resolved issues

  • DER objects were not rejected if their length field had a leading zero.
  • Allow legacy RC2 ciphers to have 40-bit keys.
  • ASN.1 Object IDs did not allow the value 0 in the path.

Breaks in compatibility

  • point_at_infinity() becomes an instance method for Crypto.PublicKey.ECC.EccKey, from a static one.

3.7.3 (19 January 2019)

Resolved issues

  • GH#258: False positive on PSS signatures when externally provided salt is too long.
  • Include type stub files for Crypto.IO and Crypto.Util.

3.7.2 (26 November 2018)

Resolved issues

  • GH#242: Fixed compilation problem on ARM platforms.

3.7.1 (25 November 2018)

New features

  • Added type stubs to enable static type checking with mypy. Thanks to Michael Nix.
  • New update_after_digest flag for CMAC.

Resolved issues

  • GH#232: Fixed problem with gcc 4.x when compiling ghash_clmul.c.
  • GH#238: Incorrect digest value produced by CMAC after cloning the object.
  • Method update() of an EAX cipher object was returning the underlying CMAC object, instead of the EAX object itself.
  • Method update() of a CMAC object was not throwing an exception after the digest was computed (with digest() or verify()).

3.7.0 (27 October 2018)

New features

  • Added support for Poly1305 MAC (with AES and ChaCha20 ciphers for key derivation).
  • Added support for ChaCha20-Poly1305 AEAD cipher.
  • New parameter output for Crypto.Util.strxor.strxor, Crypto.Util.strxor.strxor_c, encrypt and decrypt methods in symmetric ciphers (Crypto.Cipher package). output is a pre-allocated buffer (a bytearray or a writeable memoryview) where the result must be stored. This requires less memory for very large payloads; it is also more efficient when encrypting (or decrypting) several small payloads.

Resolved issues

  • GH#266: AES-GCM hangs when processing more than 4GB at a time on x86 with PCLMULQDQ instruction.

Breaks in compatibility

  • Drop support for Python 3.3.
  • Remove Crypto.Util.py3compat.unhexlify and Crypto.Util.py3compat.hexlify.
  • With the old Python 2.6, use only ctypes (and not cffi) to interface to native code.

3.6.6 (17 August 2018)

Resolved issues

  • GH#198: Fix vulnerability on AESNI ECB with payloads smaller than 16 bytes (CVE-2018-15560).

3.6.5 (12 August 2018)

Resolved issues

  • GH#187: Fixed incorrect AES encryption/decryption with AES acceleration on x86 due to gcc's optimization and strict aliasing rules.
  • GH#188: More prime number candidates than necessary where discarded as composite due to the limited way D values were searched in the Lucas test.
  • Fixed ResouceWarnings and DeprecationWarnings.
  • Workaround for Python 3.7.0 bug on Windows (https://bugs.python.org/issue34108).

3.6.4 (10 July 2018)

New features

  • Build Python 3.7 wheels on Linux, Windows and Mac.

Resolved issues

  • GH#178: Rename _cpuid module to make upgrades more robust.
  • More meaningful exceptions in case of mismatch in IV length (CBC/OFB/CFB modes).
  • Fix compilation issues on Solaris 10/11.

3.6.3 (21 June 2018)

Resolved issues

  • GH#175: Fixed incorrect results for CTR encryption/decryption with more than 8 blocks.

3.6.2 (19 June 2018)

New features

  • ChaCha20 accepts 96 bit nonces (in addition to 64 bit nonces) as defined in RFC7539.
  • Accelerate AES-GCM on x86 using PCLMULQDQ instruction.
  • Accelerate AES-ECB and AES-CTR on x86 by pipelining AESNI instructions.
  • As result of the two improvements above, on x86 (Broadwell):
    • AES-ECB and AES-CTR are 3x faster
    • AES-GCM is 9x faster

Resolved issues

  • On Windows, MPIR library was stilled pulled in if renamed to gmp.dll.

Breaks in compatibility

  • In Crypto.Util.number, functions floor_div and exact_div have been removed. Also, ceil_div is limited to non-negative terms only.

3.6.1 (15 April 2018)

New features

Resolved issues

  • In certain circumstances (at counter wrapping, which happens on average after 32 GB) AES GCM produced wrong ciphertexts.
  • Method encrypt() of AES SIV cipher could be still called, whereas only encrypt_and_digest() is allowed.

3.6.0 (8 April 2018)

New features

  • Introduced export_key and deprecated exportKey for DSA and RSA key objects.
  • Ciphers and hash functions accept memoryview objects in input.
  • Added support for SHA-512/224 and SHA-512/256.

Resolved issues

  • Reintroduced Crypto.__version__ variable as in PyCrypto.
  • Fixed compilation problem with MinGW.

3.5.1 (8 March 2018)

Resolved issues

  • GH#142. Fix mismatch with declaration and definition of addmul128.

3.5.0 (7 March 2018)

New features

  • Import and export of ECC curves in compressed form.
  • The initial counter for a cipher in CTR mode can be a byte string (in addition to an integer).
  • Faster PBKDF2 for HMAC-based PRFs (at least 20x for short passwords, more for longer passwords). Thanks to Christian Heimes for pointing out the implementation was under-optimized.
  • The salt for PBKDF2 can be either a string or bytes (GH#67).
  • Ciphers and hash functions accept data as bytearray, not just binary strings.
  • The old SHA-1 and MD5 hash functions are available even when Python's own hashlib does not include them.

Resolved issues

  • Without libgmp, modular exponentiation (since v3.4.8) crashed on 32-bit big-endian systems.

Breaks in compatibility

  • Removed support for Python < 2.6.

3.4.12 (5 February 2018)

Resolved issues

  • GH#129. pycryptodomex could only be installed via wheels.

3.4.11 (5 February 2018)

Resolved issues

  • GH#121. the record list was still not correct due to PEP3147 and __pycache__ directories. Thanks again to John O'Brien.

3.4.10 (2 February 2018)

Resolved issues

  • When creating ElGamal keys, the generator wasn't a square residue: ElGamal encryption done with those keys cannot be secure under the DDH assumption. Thanks to Weikeng Chen.

3.4.9 (1 February 2018)

New features

  • More meaningful error messages while importing an ECC key.

Resolved issues

  • GH#123 and #125. The SSE2 command line switch was not always passed on 32-bit x86 platforms.
  • GH#121. The record list (--record) was not always correctly filled for the pycryptodomex package. Thanks to John W. O'Brien.

3.4.8 (27 January 2018)

New features

  • Added a native extension in pure C for modular exponentiation, optimized for SSE2 on x86. In the process, we drop support for the arbitrary arithmetic library MPIR on Windows, which is painful to compile and deploy. The custom modular exponentiation is 130% (160%) slower on an Intel CPU in 32-bit (64-bit) mode, compared to MPIR. Still, that is much faster that CPython's own pow() function which is 900% (855%) slower than MPIR. Support for the GMP library on Unix remains.
  • Added support for manylinux wheels.
  • Support for Python 3.7.

Resolved issues

  • The DSA parameter 'p' prime was created with 255 bits cleared (but still with the correct strength).
  • GH#106. Not all docs were included in the tar ball. Thanks to Christopher Hoskin.
  • GH#109. ECDSA verification failed for DER encoded signatures. Thanks to Alastair Houghton.
  • Human-friendly messages for padding errors with ECB and CBC.

3.4.7 (26 August 2017)

New features

  • API documentation is made with sphinx instead of epydoc.
  • Start using importlib instead of imp where available.

Resolved issues

  • GH#82. Fixed PEM header for RSA/DSA public keys.

3.4.6 (18 May 2017)

Resolved issues

  • GH#65. Keccak, SHA3, SHAKE and the seek functionality for ChaCha20 were not working on big endian machines. Fixed. Thanks to Mike Gilbert.
  • A few fixes in the documentation.

3.4.5 (6 February 2017)

Resolved issues

  • The library can also be compiled using MinGW.

3.4.4 (1 February 2017)

Resolved issues

  • Removed use of alloca().
  • [Security] Removed implementation of deprecated "quick check" feature of PGP block cipher mode.
  • Improved the performance of scrypt by converting some Python to C.

3.4.3 (17 October 2016)

Resolved issues

  • Undefined warning was raised with libgmp version < 5
  • Forgot inclusion of alloca.h
  • Fixed a warning about type mismatch raised by recent versions of cffi

3.4.2 (8 March 2016)

Resolved issues

  • Fix renaming of package for install command.

3.4.1 (21 February 2016)

New features

  • Added option to install the library under the Cryptodome package (instead of Crypto).

3.4 (7 February 2016)

New features

  • Added Crypto.PublicKey.ECC module (NIST P-256 curve only), including export/import of ECC keys.
  • Added support for ECDSA (FIPS 186-3 and RFC6979).
  • For CBC/CFB/OFB/CTR cipher objects, encrypt() and decrypt() cannot be intermixed.
  • CBC/CFB/OFB, the cipher objects have both IV and iv attributes. new() accepts IV as well as iv as parameter.
  • For CFB/OPENPGP cipher object, encrypt() and decrypt() do not require the plaintext or ciphertext pieces to have length multiple of the CFB segment size.
  • Added dedicated tests for all cipher modes, including NIST test vectors
  • CTR/CCM/EAX/GCM/SIV/Salsa20/ChaCha20 objects expose the nonce attribute.
  • For performance reasons, CCM cipher optionally accepted a pre-declaration of the length of the associated data, but never checked if the actual data passed to the cipher really matched that length. Such check is now enforced.
  • CTR cipher objects accept parameter nonce and possibly initial_value in alternative to counter (which is deprecated).
  • All iv/IV and nonce parameters are optional. If not provided, they will be randomly generated (exception: nonce for CTR mode in case of block sizes smaller than 16 bytes).
  • Refactored ARC2 cipher.
  • Added Crypto.Cipher.DES3.adjust_key_parity() function.
  • Added RSA.import_key as an alias to the deprecated RSA.importKey (same for the DSA module).
  • Added size_in_bits() and size_in_bytes() methods to RsaKey.

Resolved issues

  • RSA key size is now returned correctly in RsaKey.__repr__() method (kudos to hannesv).
  • CTR mode does not modify anymore counter parameter passed to new() method.
  • CTR raises OverflowError instead of ValueError when the counter wraps around.
  • PEM files with Windows newlines could not be imported.
  • Crypto.IO.PEM and Crypto.IO.PKCS8 used to accept empty passphrases.
  • GH#6: NotImplementedError now raised for unsupported methods sign, verify, encrypt, decrypt, blind, unblind and size in objects RsaKey, DsaKey, ElGamalKey.

Breaks in compatibility

  • Parameter segment_size cannot be 0 for the CFB mode.
  • For OCB ciphers, a final call without parameters to encrypt must end a sequence of calls to encrypt with data (similarly for decrypt).
  • Key size for ARC2, ARC4 and Blowfish must be at least 40 bits long (still very weak).
  • DES3 (Triple DES module) does not allow keys that degenerate to Single DES.
  • Removed method getRandomNumber in Crypto.Util.number.
  • Removed module Crypto.pct_warnings.
  • Removed attribute Crypto.PublicKey.RSA.algorithmIdentifier.

3.3.1 (1 November 2015)

New features

  • Opt-in for update() after digest() for SHA-3, keccak, BLAKE2 hashes

Resolved issues

  • Removed unused SHA-3 and keccak test vectors, therefore significantly reducing the package from 13MB to 3MB.

Breaks in compatibility

  • Removed method copy() from BLAKE2 hashes
  • Removed ability to update() a BLAKE2 hash after the first call to (hex)digest()

3.3 (29 October 2015)

New features

  • Windows wheels bundle the MPIR library
  • Detection of faults occurring during secret RSA operations
  • Detection of non-prime (weak) q value in DSA domain parameters
  • Added original Keccak hash family (b=1600 only). In the process, simplified the C code base for SHA-3.
  • Added SHAKE128 and SHAKE256 (of SHA-3 family)

Resolved issues

  • GH#3: gcc 4.4.7 unhappy about double typedef

Breaks in compatibility

  • Removed method copy() from all SHA-3 hashes
  • Removed ability to update() a SHA-3 hash after the first call to (hex)digest()

3.2.1 (9 September 2015)

New features

  • Windows wheels are automatically built on Appveyor

3.2 (6 September 2015)

New features

  • Added hash functions BLAKE2b and BLAKE2s.
  • Added stream cipher ChaCha20.
  • Added OCB cipher mode.
  • CMAC raises an exception whenever the message length is found to be too large and the chance of collisions not negligeable.
  • New attribute oid for Hash objects with ASN.1 Object ID
  • Added Crypto.Signature.pss and Crypto.Signature.pkcs1_15
  • Added NIST test vectors (roughly 1200) for PKCS#1 v1.5 and PSS signatures.

Resolved issues

  • tomcrypt_macros.h asm error #1

Breaks in compatibility

  • Removed keyword verify_x509_cert from module method importKey (RSA and DSA).
  • Reverted to original PyCrypto behavior of method verify in PKCS1_v1_5 and PKCS1_PSS.

3.1 (15 March 2015)

New features

  • Speed up execution of Public Key algorithms on PyPy, when backed by the Gnu Multiprecision (GMP) library.
  • GMP headers and static libraries are not required anymore at the time PyCryptodome is built. Instead, the code will automatically use the GMP dynamic library (.so/.DLL) if found in the system at runtime.
  • Reduced the amount of C code by almost 40% (4700 lines). Modularized and simplified all code (C and Python) related to block ciphers. Pycryptodome is now free of CPython extensions.
  • Add support for CI in Windows via Appveyor.
  • RSA and DSA key generation more closely follows FIPS 186-4 (though it is not 100% compliant).

Resolved issues

  • None

Breaks in compatibility

  • New dependency on ctypes with Python 2.4.
  • The counter parameter of a CTR mode cipher must be generated via Crypto.Util.Counter. It cannot be a generic callable anymore.
  • Removed the Crypto.Random.Fortuna package (due to lack of test vectors).
  • Removed the Crypto.Hash.new function.
  • The allow_wraparound parameter of Crypto.Util.Counter is ignored. An exception is always generated if the counter is reused.
  • DSA.generate, RSA.generate and ElGamal.generate do not accept the progress_func parameter anymore.
  • Removed Crypto.PublicKey.RSA.RSAImplementation.
  • Removed Crypto.PublicKey.DSA.DSAImplementation.
  • Removed ambiguous method size() from RSA, DSA and ElGamal keys.

3.0 (24 June 2014)

New features

  • Initial support for PyPy.
  • SHA-3 hash family based on the April 2014 draft of FIPS 202. See modules Crypto.Hash.SHA3_224/256/384/512. Initial Keccak patch by Fabrizio Tarizzo.
  • Salsa20 stream cipher. See module Crypto.Cipher.Salsa20. Patch by Fabrizio Tarizzo.
  • Colin Percival's scrypt key derivation function (Crypto.Protocol.KDF.scrypt).
  • Proper interface to FIPS 186-3 DSA. See module Crypto.Signature.DSS.
  • Deterministic DSA (RFC6979). Again, see Crypto.Signature.DSS.
  • HMAC-based Extract-and-Expand key derivation function (Crypto.Protocol.KDF.HKDF, RFC5869).
  • Shamir's Secret Sharing protocol, compatible with ssss (128 bits only). See module Crypto.Protocol.SecretSharing.
  • Ability to generate a DSA key given the domain parameters.
  • Ability to test installation with a simple python -m Crypto.SelfTest.

Resolved issues

  • LP#1193521: mpz_powm_sec() (and Python) crashed when modulus was odd.
  • Benchmarks work again (they broke when ECB stopped working if an IV was passed. Patch by Richard Mitchell.
  • LP#1178485: removed some catch-all exception handlers. Patch by Richard Mitchell.
  • LP#1209399: Removal of Python wrappers caused HMAC to silently produce the wrong data with SHA-2 algorithms.
  • LP#1279231: remove dead code that does nothing in SHA-2 hashes. Patch by Richard Mitchell.
  • LP#1327081: AESNI code accesses memory beyond buffer end.
  • Stricter checks on ciphertext and plaintext size for textbook RSA (kudos to sharego).

Breaks in compatibility

  • Removed support for Python < 2.4.

  • Removed the following methods from all 3 public key object types (RSA, DSA, ElGamal):

    • sign
    • verify
    • encrypt
    • decrypt
    • blind
    • unblind

    Code that uses such methods is doomed anyway. It should be fixed ASAP to use the algorithms available in Crypto.Signature and Crypto.Cipher.

  • The 3 public key object types (RSA, DSA, ElGamal) are now unpickable.

  • Symmetric ciphers do not have a default mode anymore (used to be ECB). An expression like AES.new(key) will now fail. If ECB is the desired mode, one has to explicitly use AES.new(key, AES.MODE_ECB).

  • Unsuccessful verification of a signature will now raise an exception [reverted in 3.2].

  • Removed the Crypto.Random.OSRNG package.

  • Removed the Crypto.Util.winrandom module.

  • Removed the Crypto.Random.randpool module.

  • Removed the Crypto.Cipher.XOR module.

  • Removed the Crypto.Protocol.AllOrNothing module.

  • Removed the Crypto.Protocol.Chaffing module.

  • Removed the parameters disabled_shortcut and overflow from Crypto.Util.Counter.new.

Other changes

  • Crypto.Random stops being a userspace CSPRNG. It is now a pure wrapper over os.urandom.
  • Added certain resistance against side-channel attacks for GHASH (GCM) and DSA.
  • More test vectors for HMAC-RIPEMD-160.
  • Update libtomcrypt headers and code to v1.17 (kudos to Richard Mitchell).
  • RSA and DSA keys are checked for consistency as they are imported.
  • Simplified build process by removing autoconf.
  • Speed optimization to PBKDF2.
  • Add support for MSVC.
  • Replaced HMAC code with a BSD implementation. Clarified that starting from the fork, all contributions are released under the BSD license.