- Addressed issues from Cure53's audit:
- MON-01-001: Clarified which CSPRNG to use on Darwin.
- MON-01-002: Won't fix (nonce handling is a core design decision).
- MON-01-004: Compared with Kleshni's implementation.
- MON-01-005: Split a dedicated "advanced" folder in the manual.
- Quality assurance for 2^255-19 arithmetic (elliptic curves):
- Documented carry propagation.
- Enforced slightly safer invariants.
- Improved the speed of EdDSA signature generation.
- Made the vectors.h header more compact and easier to modify.
- TIS-CI integration.
- Added speed benchmark for ed25519-donna.
- Documented lengths limits of
- Various documentation fixes.
- Fixed various compiler warnings.
- Fixed some integer overflows (16-bit platforms only).
- Added Elligator 2 mappings (hash to curve, curve to hash).
- Added OPRF support (with scalar inversion).
- Added Edwards25519 -> Curve25519 conversions
- Deprecated the incremental AEAD interface.
- Deprecated the incremental Chacha20, added a direct interface.
- Added IETF Chacha20 (96-bit nonce), as described in RFC 8439.
- Moved deprecated interfaces to a separate
- Removed the
- Added a custom hash interface to EdDSA. Several instances of EdDSA can share the same binary.
- Added optional support for HMAC SHA-512
- Moved all SHA-512 operations to
- Optional support for Ed25519 no longer requires a preprocessor flag.
src/optional/monocypher-ed25519.(h|c)to your project instead.
- Added the
BLAKE2_NO_UNROLLINGpreprocessor definition. Activating it makes the binary about 5KB smaller, and speeds up processing times on many embedded processors.
- Reduced the stack usage of signature verification by about 40%. Signature verification now fits in smaller machines.
- Fixed many implicit casts warnings.
- Fixed the manual here and there.
- Lots of small nitpicks.
- Faster EdDSA signatures and verification. Like, 4 times as fast.
- Corrected a critical vulnerability in EdDSA, where crypto_check() was accepting invalid signatures. (Found by Mike Pechkin.) The current fix removes a buggy optimisation, effectively halving the performance of EdDSA.
- The test suite no longer tries to allocate zero bytes (some platforms fail such an allocation).
- Corrected undefined behaviour in Blake2b
- Improved the test suite (faster, better coverage)
- Corrected a couple failures to wipe secret buffers.
- Corrected a bug that prevented compilation in Ed25519 mode.
- Adjusted the number of test vectors in the test suite.
- Improved tests for incremental interfaces.
- Replaced the GNU all permissive licence by a public domain dedication (Creative Commons CC-0). The BSD licence remains as a fallback.
- Followed a systematic pattern for the loading code of symmetric crypto. It is now easier to review.
- Tweaked Poly1305 code to make it easier to prove correct.
- Changed the authenticated encryption format. It now conforms to
RFC 7539, with one exception: it uses XChacha20 initialisation instead
of the IETF version of Chacha20. This new format conforms to
The format change facilitates optimisation by aligning data to block boundaries. The API changes increase consistency.
- Rewrote the manual into proper man pages.
- Added incremental interfaces for authenticated encryption and signatures.
- A couple breaking API changes, easily fixed by renaming the affected functions.
- Optimised the loading and unloading code of the symmetric crypto (Blake2b, sha512, Chacha20, and Poly1305).
- Fused self contained tests together for easier analysis with Frama-C and the TIS interpreter.
crypto_chacha20_x_init, for consistency reasons (snake case everywhere).
- Fixed signed integer overflow detected by UBSan.
- Doubled the speed of EdDSA by performing the scalar product in Montgomery space.
- Added about a hundred lines of code to improve performance of public key cryptography. Diffie-Hellman is now 20% faster than before. (The effects are less pronounces for EdDSA).
- Added random self-consistency tests.
- Added a speed benchmark against libsodium.
- Slightly changed the authenticated encryption API. Functions are now all in "detached" mode. The reason is better support for authenticated encryption without additional data.
- Rewrote Blake2b from spec, so it can use the same licence as everything else.
- Added random tests that compare Monocypher with libsodium and ed25519-donna.
- Added explicit support for Frama-C analysis (this doesn't affect the source code)
- Fixed incorrect poly1305 output on empty messages. (Found by Mike Pechkin.)
- Fixed many undefined behaviours in curve25519, that occur whenever we perform a left shift on a signed negative integer. It doesn't affect the generated code, but you never know. (Found with Frama-C by André Maroneze.)
Fun fact: TweetNaCl and ref10 have the same bug. Libsodium have corrected the issue, though.
For those who don't comprehend the magnitude of this madness, the
-1 << 3 is undefined in C. This is explained in
section 6.5.7(§4) of the C11 standard.
- Fixed critical bug causing Argon2i to fail whenever it uses more than 512 blocks. It was reading uninitialised memory, and the results were incorrect. (Found by Mike Pechkin.)
- Fixed an undefined behaviour in curve25519 (
fe_tobytes()). It was accessing uninitialised memory, before throwing it away. It didn't affect the compiled code nor the results, but you never know. (Found with Frama-C by André Maroneze.)
- Got the invariants of poly1305 right, put them in the comments. There was no bug, but that was lucky (turned out the IETF test vectors were designed to trigger the bugs I was afraid of).
- Simplified poly1305 finalisation (replaced conditional subtraction by a carry propagation).
- Made a few cosmetic changes here and there.
- Public interface significantly reworked. Removed redundant, hard to mess up constructions.
- Added AEAD.
- Sped up curve25519 by a factor of more than 6 (switched to ref10 arithmetic)
- Added various test vectors, completed the consistency tests.