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.
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.prv`, `mykey.pub` with merkle tree height 10 and winternitz parameter 2
cargo run --release --example lms-demo -- genkey mykey 10/2 --seed 0123456701234567012345670123456701234567012345670123456701234567
# Signing
# Generates `message.txt.sig`
cargo run --release --example lms-demo -- sign mykey message.txt
# Signing (fast_verification)
# Generates `message.txt_mut`, `message.txt_mut.sig`
HBS_LMS_MAX_HASH_OPTIMIZATIONS=1000 HBS_LMS_THREADS=2 cargo run --release --example lms-demo \
--features fast_verify -- sign_mut mykey message.txt
# Verification
# Verifies `message.txt` with `message.txt.sig` against `mykey.pub`
cargo run --release --example lms-demo -- verify mykey message.txt
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 | hash_chain_count | The number of hash chains for a certain W parameter |
| 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 |
The crate in this repository supports Rust 1.63 or higher.
Minimum supported Rust version can be changed in the future, but it will be done with a minor version bump.
This work is licensed under terms of the Apache-2.0 license (see LICENSE file).
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.