Changelog

4.0.2

2023/08/24

• Fixed multiple-lanes Argon2.
• Improved Poly1305 performance.
• Improved Argon2 performance.
• Makefiles no longer override standard environment variables.

4.0.1

2023/03/06

• Fixed Ed25519 secret key size in function prototype.
• Fixed soname (should have been changed in 4.0.0)
• Added convenience sub-targets to makefile.
• Briefly specified wire format of Elligator and incremental AEAD.

4.0.0

2023/02/20

• Fixed unsafe signature API.
• Simpler, more flexible low-level signature API.
• Fully specified, consensus-friendly signatures.
• Added Argon2d and Argon2id, support multiple lanes.
• Added safe and fast streaming AEAD.
• Added HKDF-SHA-512 and documented BLAKE2b KDF.
• More consistent and memorable function names.
• POSIX makefile.

3.1.3

2022/04/25

• Fixed many typos in the documentation.
• Fixed buffer overflow in speed benchmarks.
• Fixed some MSVC warnings.
• Fixed a minor violation of the Elligator2 reverse map specs.
• Added change-prefix.sh to help changing the crypto_ prefix.
• Added the MONOCYPHER_CPP_NAMESPACE preprocessor definition to support namespaces for C++.
• Deprecated crypto_key_exchange()
• Use GitHub actions to automate the regular test suite.

3.1.2

2020/12/27

• 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 crypto_ietf_chacha20()

3.1.1

2020/06/15

• Various documentation fixes.
• Fixed various compiler warnings.
• Fixed some integer overflows (16-bit platforms only).

3.1.0

2020/04/03

• Added Elligator 2 mappings (hash to curve, curve to hash).
• Added OPRF support (with scalar inversion).
• Added Edwards25519 -> Curve25519 conversions.

3.0.0

2020/01/19

• 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 src/deprecated folder.
• Removed the ED25519_SHA512 preprocessor flag.
• crypto_x25519() and crypto_key_exchange() now return void.
• Added a custom hash interface to EdDSA. Several instances of EdDSA can share the same binary.
• Added optional support for HMAC SHA-512.
• Moved SHA-512 operations to src/optional/monocypher-ed25519.(h|c).
• Optional support for Ed25519 no longer requires a preprocessor flag. Add src/optional/monocypher-ed25519.(h|c) to your project instead.

2.0.6

2019/10/21

• Added the BLAKE2_NO_UNROLLING preprocessor 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.

2.0.5

2018/08/23

• Faster EdDSA signatures and verification. Like, 4 times as fast.

2.0.4

2018/06/24

• Corrected a critical vulnerability found by Mike Pechkin in EdDSA, where crypto_check() was accepting invalid signatures. 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).

2.0.3

2018/06/16

• Corrected undefined behaviour in BLAKE2b.
• Improved the test suite (faster, better coverage).

2.0.2

2018/04/23

• 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.

2.0.1

2018/03/07

• 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.

2.0.0

2018/02/14

• 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 libsodium’s crypto_aead_xchacha20poly1305_ietf_encrypt.
• Removed crypto_lock_encrypt() and crypto_lock_auth().
• Renamed crypto_lock_aead_auth() to crypto_lock_auth_ad().
• Renamed crypto_unlock_aead_auth() to crypto_unlock_auth_ad().
• Added crypto_lock_auth_message() and crypto_unlock_auth_message().
• Renamed crypto_aead_lock to crypto_lock_aead.
• Renamed crypto_aead_unlock to crypto_unlock_aead.

The format change facilitates optimisation by aligning data to block boundaries. The API changes increase consistency.

1.1.0

2018/02/06

• Rewrote the manual into proper man pages.
• Added incremental interfaces for authenticated encryption and signatures.
• Replaced crypto_memcmp() by 3 fixed size buffer comparisons (16, 32, and 64 bytes), to make sure the generated code remains constant time.
• A couple breaking API changes, easily fixed by renaming the affected functions.

1.0.1

2017/07/23

• Optimised the loading and unloading code of the symmetric crypto (BLAKE2b, SHA-512, Chacha20, and Poly1305).
• Fused self-contained tests together for easier analysis with Frama-C and the TIS interpreter.

1.0

2017/07/18

• Renamed crypto_chacha20_Xinit to 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.

0.8

2017/07/06

• 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 pronounced for EdDSA.
• Added random self-consistency tests.
• Added a speed benchmark against libsodium.

0.7

2017/06/07

• 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).

0.6

2017/03/17

• Fixed incorrect Poly1305 output on empty messages. (Found by Mike Pechkin.)

0.5

2017/03/10

• 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 has corrected the issue, though.

For those who don’t comprehend the magnitude of this madness, the expression -1 << 3 is undefined in C. This is explained in section 6.5.7(§4) of the C11 standard.

0.4

2017/03/09

• 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.)

0.3

2017/02/27

• Got the invariants of Poly1305 right and 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.

0.2

????/??/??

• 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 and completed the consistency tests.

0.1

2016/??/??