py-lean-pq
Python bindings for leanVM's post-quantum signatures, built on the safe Rust
facade lean-pq:
- leanXMSS: stateful hash-based signatures,
2^32leaf indices per key. - leanSPHINCS: stateless hash-based signatures.
- Aggregation: a recursive proof that every listed public key signed its message. Aggregates can be combined into larger aggregates.
Public keys and messages are 32 bytes. Signatures are plain fixed-length
bytes (2404 for leanXMSS, 4276 for leanSPHINCS). Errors raise
LeanPqError; a seed, message, public key, or signature of the wrong length
raises ValueError. Key generation, signing, verification, aggregation, and
aggregate decoding release the GIL.
Requires Python >= 3.11. Wheels are built for Linux (x86_64, aarch64; glibc + musl) and macOS arm64.
Install
pip install py-lean-pq
The same library is published for Node.js (@kevaundray/lean-pq on npm), Java
(io.github.crate-crypto:lean-pq on Maven Central), and Zig (a zig fetch
package on each GitHub release); see the
repository README.
leanXMSS
import py_lean_pq as lpq
key = lpq.XmssSecretKey.from_seed(b"\x01" * 32) # or XmssSecretKey.generate()
message = b"\x42" * 32
key.prepare(5) # optional: build the bottom tree for leaf 5 ahead of time
signature = key.sign(message, 5)
lpq.xmss_verify(key.public_key, message, signature) # raises LeanPqError if invalid
restored = lpq.XmssSecretKey.from_bytes(key.to_bytes())
leanXMSS keys are stateful: never sign two different messages at the same leaf
index. Persist your own durable high-water leaf index alongside
XmssSecretKey.to_bytes() (the key's seed, secret material) and advance it
before publishing a signature.
leanSPHINCS
A key keeps one subtree of height kept_height (at most 26), trading signing
capacity for key generation time.
key = lpq.SphincsSecretKey.from_seed(b"\x02" * 32, 4) # or SphincsSecretKey.generate(4)
signature = key.sign(message)
lpq.sphincs_verify(key.public_key, message, signature)
restored = lpq.SphincsSecretKey.from_bytes(key.to_bytes())
assert restored.kept_height == 4
Aggregation
aggregate proves raw (public_key, message, signature) tuples of either
scheme together with up to 16 child aggregates. The result's claims are the
union of its inputs' claims. Raw signatures are verified before proving.
xmss_key = lpq.XmssSecretKey.from_seed(b"\x05" * 32)
sphincs_key = lpq.SphincsSecretKey.from_seed(b"\x06" * 32, 4)
first, second = b"\x11" * 32, b"\x22" * 32
left = lpq.aggregate(xmss=[(xmss_key.public_key, first, xmss_key.sign(first, 0))])
right = lpq.aggregate(sphincs=[(sphincs_key.public_key, second, sphincs_key.sign(second))])
root = lpq.aggregate(
children=[left, right],
xmss=[(xmss_key.public_key, second, xmss_key.sign(second, 1))],
)
received = lpq.Aggregate.from_bytes(root.to_bytes()) # decodes and verifies
assert received.sphincs_claims == [(sphincs_key.public_key, second)]
Every Aggregate value has been proven or verified. It attests the claims it
lists, not the claims you wanted: compare xmss_claims and sphincs_claims
(sorted lists of (public_key, message)) against what you expect.
aggregate and Aggregate.from_bytes build the aggregation guest on first
use; call setup() to pay that cost earlier. It is safe to call repeatedly.
Proving is serialized process-wide and takes seconds and over a gigabyte of
memory.
Development
uv run --extra dev maturin develop --release
uv run --extra dev pytest tests/ -v
uv run --extra dev python -m mypy.stubtest py_lean_pq --allowlist stubtest_allowlist.txt
Always build in release: debug builds of leanVM prove roughly 30x slower.
License
MIT OR Apache-2.0
1 maintainer
Metadata
1 maintainer
Release files for py-lean-pq 0.6.2
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