6 releases (3 breaking)

0.4.1 Aug 8, 2023
0.4.0 Aug 8, 2023
0.3.0 Mar 21, 2023
0.2.0 Mar 16, 2023
0.1.1 Oct 29, 2022

#632 in Cryptography

Download history 26/week @ 2024-02-17 31/week @ 2024-02-24 15/week @ 2024-03-02 22/week @ 2024-03-09 15/week @ 2024-03-16 13/week @ 2024-03-23 40/week @ 2024-03-30 20/week @ 2024-04-06 34/week @ 2024-04-13 16/week @ 2024-04-20

111 downloads per month
Used in 10 crates (8 directly)

MIT license

941 lines


Ciphersuites for elliptic curves premised on ff/group.

This library, except for the not recommended Ed448 ciphersuite, was audited by Cypher Stack in March 2023, culminating in commit 669d2dbffc1dafb82a09d9419ea182667115df06. Any subsequent changes have not undergone auditing.

This library is usable under no_std. The alloc and std features enable reading from the io::Read trait, shimmed by std-shims under alloc.


Secp256k1 and P-256 are offered via k256 and p256, two libraries maintained by RustCrypto.

Their hash_to_F is the IETF's hash to curve, yet applied to their scalar field.


Ed25519/Ristretto are offered via dalek-ff-group, an ff/group wrapper around curve25519-dalek.

Their hash_to_F is the wide reduction of SHA2-512, as used in RFC-8032. This is also compliant with the draft RFC-RISTRETTO. The domain-separation tag is naively prefixed to the message.


Ed448 is offered via minimal-ed448, an explicitly not recommended, unaudited, incomplete Ed448 implementation, limited to its prime-order subgroup.

Its hash_to_F is the wide reduction of SHAKE256, with a 114-byte output, as used in RFC-8032. The domain-separation tag is naively prefixed to the message.


~64K SLoC