Leighton-Micali Hash-Based Signatures
LMS implementation in Rust according to the IETF RFC 8554. This implementation is binary compatible with the reference implementation found here: hash-sigs.
This crate does not require the standard library (i.e. no_std capable) and can be easily used for bare-metal programming.
Demo
A demo application is located in the examples folder to demonstrate the use of the library. This demo application can be used in the console as follows:
# Key generation
# Generates `mykey.priv`, `mykey.pub` with merkle tree height 10 and winternitz parameter 2
cargo run --release --example lms-demo -- genkey mykey 10/2
# Signing
# Generates `message.txt.sig`
cargo run --release --example lms-demo -- sign mykey message.txt
# Verification
# Verifies `message.txt` with `message.txt.sig` against `mykey.pub`
cargo run --release --example lms-demo -- verify mykey message.txt
Naming conventions wrt to the IETF RFC
The naming in the RFC is done by using a single character. To allow for a better understanding of the implementation, we have decided to use more descriptive designations. The following table shows the mapping between the RFC and the library naming including a short description.
| RFC Naming | Library Naming | Meaning |
|---|---|---|
| I | lms_tree_identifier | 16-byte random value to identify a single LMS tree |
| q | lms_leaf_identifier | 4-byte value to identify all leafs in a single LMS tree |
| C | signature_randomizer | 32-byte random value added to every signature |
| Q | message_hash | Output of hashed message together with I, q, D_MESG and C |
| y | signature_data | The actual data of the signature |
| p | max_hash_iterations | The maximum value of hash iterations |
| ls | checksum_left_shift | How many bits the checksum is shifted into the coef-value |
| n | hash_function_output_size | Number of bytes that the lm_ots hash functions generates |
| m | hash_function_output_size | Number of bytes that the lms hash functions generates |
Minimum Supported Rust Version
The crate in this repository supports Rust 1.53 or higher.
Minimum supported Rust version can be changed in the future, but it will be done with a minor version bump.
Licensing
This work is licensed under terms of the Apache-2.0 license (see LICENSE file).
Contribution
Any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be licensed as above, without any additional terms or conditions.
10 Mar 31, 2023
64 Dec 17, 2022
300 Jan 8, 2023
3 Nov 30, 2022
6 Oct 21, 2023
8 Feb 26, 2024
1.2k Dec 27, 2022
611 Dec 25, 2022
31 Dec 12, 2022
13 Dec 20, 2022
137 Dec 29, 2022
7 Jun 29, 2022
73 Jan 1, 2023
476 Dec 22, 2022
34 Apr 13, 2022