diff --git a/.gitignore b/.gitignore index c5df1db2..9240575c 100644 --- a/.gitignore +++ b/.gitignore @@ -1,2 +1,3 @@ target *.wasm +tpke-python/py-benches/inputs/ \ No newline at end of file diff --git a/Cargo.lock b/Cargo.lock index e3c7a41c..6d6161a3 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -1084,6 +1084,12 @@ dependencies = [ "serde", ] +[[package]] +name = "indoc" +version = "1.0.7" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "adab1eaa3408fb7f0c777a73e7465fd5656136fc93b670eb6df3c88c2c1344e3" + [[package]] name = "inferno" version = "0.10.12" @@ -1539,6 +1545,75 @@ dependencies = [ "unicode-ident", ] +[[package]] +name = "pyo3" +version = "0.16.6" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "0220c44442c9b239dd4357aa856ac468a4f5e1f0df19ddb89b2522952eb4c6ca" +dependencies = [ + "cfg-if 1.0.0", + "indoc", + "libc", + "parking_lot", + "pyo3-build-config 0.16.6", + "pyo3-ffi", + "pyo3-macros", + "unindent", +] + +[[package]] +name = "pyo3-build-config" +version = "0.16.6" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "9c819d397859445928609d0ec5afc2da5204e0d0f73d6bf9e153b04e83c9cdc2" +dependencies = [ + "once_cell", + "target-lexicon", +] + +[[package]] +name = "pyo3-build-config" +version = "0.17.3" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "28fcd1e73f06ec85bf3280c48c67e731d8290ad3d730f8be9dc07946923005c8" +dependencies = [ + "once_cell", + "target-lexicon", +] + +[[package]] +name = "pyo3-ffi" +version = "0.16.6" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "ca882703ab55f54702d7bfe1189b41b0af10272389f04cae38fe4cd56c65f75f" +dependencies = [ + "libc", + "pyo3-build-config 0.16.6", +] + +[[package]] +name = "pyo3-macros" +version = "0.16.6" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "568749402955ad7be7bad9a09b8593851cd36e549ac90bfd44079cea500f3f21" +dependencies = [ + "proc-macro2", + "pyo3-macros-backend", + "quote", + "syn", +] + +[[package]] +name = "pyo3-macros-backend" +version = "0.16.6" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "611f64e82d98f447787e82b8e7b0ebc681e1eb78fc1252668b2c605ffb4e1eb8" +dependencies = [ + "proc-macro2", + "quote", + "syn", +] + [[package]] name = "quick-xml" version = "0.22.0" @@ -1952,6 +2027,12 @@ dependencies = [ "unicode-xid", ] +[[package]] +name = "target-lexicon" +version = "0.12.5" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "9410d0f6853b1d94f0e519fb95df60f29d2c1eff2d921ffdf01a4c8a3b54f12d" + [[package]] name = "tempfile" version = "3.3.0" @@ -2056,6 +2137,15 @@ dependencies = [ "serde", ] +[[package]] +name = "tpke-python" +version = "0.1.0" +dependencies = [ + "group-threshold-cryptography", + "pyo3", + "pyo3-build-config 0.17.3", +] + [[package]] name = "tpke-wasm" version = "0.1.0" @@ -2110,6 +2200,12 @@ version = "0.2.3" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "957e51f3646910546462e67d5f7599b9e4fb8acdd304b087a6494730f9eebf04" +[[package]] +name = "unindent" +version = "0.1.10" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "58ee9362deb4a96cef4d437d1ad49cffc9b9e92d202b6995674e928ce684f112" + [[package]] name = "universal-hash" version = "0.5.0" diff --git a/Cargo.toml b/Cargo.toml index 8c6c402f..72edf305 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -6,6 +6,7 @@ members = [ "subproductdomain", "tpke", "tpke-wasm", + "tpke-python", ] [profile.bench] diff --git a/tpke-python/.gitignore b/tpke-python/.gitignore new file mode 100644 index 00000000..b2417b63 --- /dev/null +++ b/tpke-python/.gitignore @@ -0,0 +1,7 @@ +__pycache__ +*.egg-info +*.so +build/ +dist/ +docs/_build + diff --git a/tpke-python/BENCHMARK.md b/tpke-python/BENCHMARK.md new file mode 100644 index 00000000..6115eaff --- /dev/null +++ b/tpke-python/BENCHMARK.md @@ -0,0 +1,52 @@ +# Benchmarks + +## Hardware + +Benchmarks produced on: + +- Intel® Core™ i7-10875H CPU @ 2.30GHz × 16 (single-threaded), +- Version 107.0.5304.110 (Official Build) (64-bit), +- Pop!\_OS 22.04 LTS (64-bit), + +### Setup + +First, build the WASM target and make inputs for Python benchmarks: + +```bash +cd tpke-wasm +wasm-pack build --release --target nodejs # Notice the target +node scripts/make-python-bench-inputs.js +``` + +Then, build and install the Python package: + +```bash +cd tpke-python +pip install -e . +``` + +### Running + +```bash +cd tpke-python +python py-benches/benchmark.py + +``` + +## Results + +Using fixed values, such that `shares=num_entities=threshold`. + +Rounding to nearest ms. + +### Python Results + +Filename refers to the number of shares. + +``` +participant-payloads-8.json: 2 ms +participant-payloads-16.json: 3 ms +participant-payloads-32.json: 6 ms +participant-payloads-64.json: 12 ms +participant-payloads-128.json: 25 ms +``` diff --git a/tpke-python/Cargo.toml b/tpke-python/Cargo.toml new file mode 100644 index 00000000..4387875e --- /dev/null +++ b/tpke-python/Cargo.toml @@ -0,0 +1,15 @@ +[package] +name = "tpke-python" +authors = ["Piotr Roslaniec "] +version = "0.1.0" +edition = "2018" + +[lib] +crate-type = ["cdylib"] + +[dependencies] +pyo3 = "0.16" +group-threshold-cryptography = { path = "../tpke"} + +[build-dependencies] +pyo3-build-config = "*" diff --git a/tpke-python/LICENSE b/tpke-python/LICENSE new file mode 100755 index 00000000..2fb2e74d --- /dev/null +++ b/tpke-python/LICENSE @@ -0,0 +1,675 @@ +### GNU GENERAL PUBLIC LICENSE + +Version 3, 29 June 2007 + +Copyright (C) 2007 Free Software Foundation, Inc. + + +Everyone is permitted to copy and distribute verbatim copies of this +license document, but changing it is not allowed. + +### Preamble + +The GNU General Public License is a free, copyleft license for +software and other kinds of works. + +The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If not, see . + +Also add information on how to contact you by electronic and paper +mail. + +If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands \`show w' and \`show c' should show the +appropriate parts of the General Public License. Of course, your +program's commands might be different; for a GUI interface, you would +use an "about box". + +You should also get your employer (if you work as a programmer) or +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. For more information on this, and how to apply and follow +the GNU GPL, see . + +The GNU General Public License does not permit incorporating your +program into proprietary programs. If your program is a subroutine +library, you may consider it more useful to permit linking proprietary +applications with the library. If this is what you want to do, use the +GNU Lesser General Public License instead of this License. But first, +please read . diff --git a/tpke-python/MANIFEST.in b/tpke-python/MANIFEST.in new file mode 100644 index 00000000..2dff285a --- /dev/null +++ b/tpke-python/MANIFEST.in @@ -0,0 +1,4 @@ +include Cargo.toml +include README.md +include LICENSE +recursive-include src * diff --git a/tpke-python/README.md b/tpke-python/README.md new file mode 100644 index 00000000..5bc58a51 --- /dev/null +++ b/tpke-python/README.md @@ -0,0 +1,5 @@ +# Python bindings for `tpke` + +## Build + +You will need to have `setuptools-rust` installed. Then, for development, you can just do `pip install -e .` as usual. diff --git a/tpke-python/build.rs b/tpke-python/build.rs new file mode 100644 index 00000000..dace4a9b --- /dev/null +++ b/tpke-python/build.rs @@ -0,0 +1,3 @@ +fn main() { + pyo3_build_config::add_extension_module_link_args(); +} diff --git a/tpke-python/py-benches/benchmark.py b/tpke-python/py-benches/benchmark.py new file mode 100644 index 00000000..b2aa3cba --- /dev/null +++ b/tpke-python/py-benches/benchmark.py @@ -0,0 +1,39 @@ +import os +import time +import json +import statistics +from tpke import ParticipantPayload + +# First, load pre-generated data + +inputs_path = 'py-benches/inputs' + +inputs = {} +for file_name in os.listdir(inputs_path): + with open(os.path.join(inputs_path, file_name)) as f: + payloads = [] + for payload_hex in json.load(f): + payload = ParticipantPayload.from_bytes(bytes.fromhex(payload_hex)) + payloads.append(payload) + inputs[file_name] = payloads + + +# Now, benchmark + +def bench_fn(fn, inputs): + BENCHMARK_TRIALS = 25 + + times = [] + for _ in range(BENCHMARK_TRIALS): + start_time = time.perf_counter() + fn(inputs) + end_time = time.perf_counter() + execution_time = (end_time - start_time) + times.append(execution_time) + return statistics.median(times) + + +for file_name, payloads in inputs.items(): + def fn(inputs): return [p.to_decryption_share() for p in inputs] + median_time = bench_fn(fn, payloads) + print(f"{file_name}: {int(median_time * 1000)} ms") # Rounding to ms diff --git a/tpke-python/pyproject.toml b/tpke-python/pyproject.toml new file mode 100644 index 00000000..31ffe048 --- /dev/null +++ b/tpke-python/pyproject.toml @@ -0,0 +1,2 @@ +[build-system] +requires = ["setuptools", "wheel", "setuptools-rust"] diff --git a/tpke-python/setup.py b/tpke-python/setup.py new file mode 100644 index 00000000..dee29136 --- /dev/null +++ b/tpke-python/setup.py @@ -0,0 +1,39 @@ +from setuptools import setup +from setuptools_rust import Binding, RustExtension + +from pathlib import Path +this_directory = Path(__file__).parent +long_description = (this_directory / "README.md").read_text() + +setup( + name="tpke", + description="Ferveo DKG scheme", + long_description=long_description, + long_description_content_type="text/markdown", + version="0.1.0", + author="Piotr Roslaniec", + author_email="p.roslaniec@gmail.com", + url="https://github.com/nucypher/ferveo/tree/master/tpke-python", + rust_extensions=[RustExtension( + "tpke._tpke", binding=Binding.PyO3, debug=False)], + packages=["tpke"], + package_data={ + 'tpke': ['py.typed', '__init__.pyi'], + }, + # rust extensions are not zip safe, just like C-extensions. + zip_safe=False, + classifiers=[ + "Development Status :: 3 - Alpha", + "Intended Audience :: Developers", + "License :: OSI Approved :: GNU General Public License v3 (GPLv3)", + "Natural Language :: English", + "Programming Language :: Rust", + "Programming Language :: Python :: Implementation :: CPython", + "Programming Language :: Python :: 3 :: Only", + "Programming Language :: Python :: 3.7", + "Programming Language :: Python :: 3.8", + "Programming Language :: Python :: 3.9", + "Programming Language :: Python :: 3.10", + "Topic :: Security :: Cryptography", + ], +) diff --git a/tpke-python/src/lib.rs b/tpke-python/src/lib.rs new file mode 100644 index 00000000..0e616760 --- /dev/null +++ b/tpke-python/src/lib.rs @@ -0,0 +1,46 @@ +// Clippy shows false positives in PyO3 methods. +// See https://github.com/rust-lang/rust-clippy/issues/8971 +// Will probably be fixed by Rust 1.65 +#![allow(clippy::borrow_deref_ref)] + +extern crate alloc; + +extern crate group_threshold_cryptography as tpke; + +use pyo3::prelude::*; +use pyo3::types::PyBytes; + +#[pyclass(module = "tpke")] +pub struct DecryptionShare(tpke::api::DecryptionShare); + +impl DecryptionShare { + pub fn to_bytes(&self) -> PyResult { + Ok(Python::with_gil(|py| -> PyObject { + PyBytes::new(py, &self.0.to_bytes()).into() + })) + } +} + +#[pyclass(module = "tpke")] +pub struct ParticipantPayload(tpke::api::ParticipantPayload); + +#[pymethods] +impl ParticipantPayload { + #[staticmethod] + pub fn from_bytes(bytes: &[u8]) -> Self { + Self(tpke::api::ParticipantPayload::from_bytes(bytes)) + } + + pub fn to_decryption_share(&self) -> DecryptionShare { + DecryptionShare(self.0.to_decryption_share()) + } +} + +/// A Python module implemented in Rust. +#[pymodule] +fn _tpke(_py: Python, m: &PyModule) -> PyResult<()> { + m.add_class::()?; + m.add_class::()?; + + Ok(()) +} diff --git a/tpke-python/tpke/__init__.py b/tpke-python/tpke/__init__.py new file mode 100644 index 00000000..b85ea156 --- /dev/null +++ b/tpke-python/tpke/__init__.py @@ -0,0 +1,4 @@ +from ._tpke import ( + DecryptionShare, + ParticipantPayload +) diff --git a/tpke-python/tpke/__init__.pyi b/tpke-python/tpke/__init__.pyi new file mode 100644 index 00000000..413af70c --- /dev/null +++ b/tpke-python/tpke/__init__.pyi @@ -0,0 +1,16 @@ +class DecryptionShare: + + def __bytes__(self) -> bytes: + ... + + +class ParticipantPayload: + + @staticmethod + def from_bytes(data: bytes) -> ParticipantPayload: + ... + + def to_decryption_share(self) -> DecryptionShare: + ... + + diff --git a/tpke-python/tpke/py.typed b/tpke-python/tpke/py.typed new file mode 100644 index 00000000..e69de29b diff --git a/tpke-wasm/BENCHMARK.md b/tpke-wasm/BENCHMARK.md index 15fc3d69..ce51030c 100644 --- a/tpke-wasm/BENCHMARK.md +++ b/tpke-wasm/BENCHMARK.md @@ -1,6 +1,6 @@ # Benchmarks -## Setup +## Hardware Benchmarks produced on: diff --git a/tpke-wasm/js-benches/index.js b/tpke-wasm/js-benches/index.js index 679dd844..0fbda838 100644 --- a/tpke-wasm/js-benches/index.js +++ b/tpke-wasm/js-benches/index.js @@ -35,7 +35,7 @@ function benchmark_combine(setup) { const decryptionShares = []; setup.decrypter_indexes().forEach((index) => { const decryptionContext = setup.private_context_at(index); - const share = new ParticipantPayload( + const share = new ParticipantPayload( decryptionContext, ciphertext ).to_decryption_share(); diff --git a/tpke-wasm/scripts/make-python-bench-inputs.js b/tpke-wasm/scripts/make-python-bench-inputs.js new file mode 100644 index 00000000..893eaa7e --- /dev/null +++ b/tpke-wasm/scripts/make-python-bench-inputs.js @@ -0,0 +1,63 @@ +const { + Setup, + encrypt, + ParticipantPayload, +} = require("../pkg/tpke_wasm.js"); +const fs = require("fs"); + +// Convert a byte array to a hex string +function bytesToHex(bytes) { + for (var hex = [], i = 0; i < bytes.length; i++) { + var current = bytes[i] < 0 ? bytes[i] + 256 : bytes[i]; + hex.push((current >>> 4).toString(16)); + hex.push((current & 0xF).toString(16)); + } + return hex.join(""); +} + +function persist(filePath, data) { + try { + fs.writeFileSync(filePath, data); + } catch (err) { + console.error(err); + } +} + +const makeParticipantPayloads = (setup) => { + const message = Uint8Array.from([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]); + const aad = Uint8Array.from([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]); + const ciphertext = encrypt(message, aad, setup.public_key); + + // Using a push to array here instead of map because somehow map breaks + // DecryptionShare into Uint8Array during iteration + const payloads = []; + setup.decrypter_indexes().forEach((index) => { + const decryptionContext = setup.private_context_at(index); + const payload = new ParticipantPayload( + decryptionContext, + ciphertext + ).to_bytes() + payloads.push(payload); + }); + return payloads; +} + +const makeInputs = async () => { + console.log("Running"); + + const numShares = [8, 16, 32, 64, 128]; + for (const shares of numShares) { + const setup = new Setup(shares, shares, shares); + + const payloads = makeParticipantPayloads(setup).map(bytesToHex); + const filePath = `../tpke-python/py-benches/inputs/participant-payloads-${shares}.json`; + + console.log(`Writing ${filePath}`); + persist(filePath, JSON.stringify(payloads)); + + } + console.log("Done!"); +}; + +makeInputs() + .catch((err) => console.error(err)); diff --git a/tpke-wasm/src/lib.rs b/tpke-wasm/src/lib.rs index a5b80eee..3b3705fb 100644 --- a/tpke-wasm/src/lib.rs +++ b/tpke-wasm/src/lib.rs @@ -2,9 +2,6 @@ mod utils; extern crate group_threshold_cryptography as tpke; -use ark_ec::{AffineCurve, ProjectiveCurve}; -use ark_ff::BigInteger256; -use ark_ff::ToBytes; use ark_serialize::{CanonicalDeserialize, CanonicalSerialize}; use serde::{Deserialize, Serialize}; use serde_with::serde_as; @@ -24,74 +21,27 @@ pub type TpkeSharedSecret = #[wasm_bindgen] #[derive(Clone, Debug)] -pub struct PrivateDecryptionContext { - b_inv: ark_bls12_381::Fr, - decrypter_index: usize, -} - -// Keeping this out of the `PrivateDecryptionContext`, since wasm_bindgen doesn't -// support constant field definitions. -const B_INV_LEN: usize = 32; -const DECRYPTER_INDEX_LEN: usize = 8; - +pub struct PrivateDecryptionContext(tpke::api::PrivateDecryptionContext); #[wasm_bindgen] impl PrivateDecryptionContext { - pub(crate) fn new( - b_inv: &ark_bls12_381::Fr, - decrypter_index: usize, - ) -> Self { - Self { - b_inv: *b_inv, - decrypter_index, - } - } - pub(crate) fn serialized_size() -> usize { - B_INV_LEN + DECRYPTER_INDEX_LEN + tpke::api::PrivateDecryptionContext::serialized_size() } #[wasm_bindgen] pub fn to_bytes(&self) -> Vec { - let mut bytes = Vec::new(); - self.b_inv.0.write(&mut bytes).unwrap(); - - let decrypter_index = - bincode::serialize(&self.decrypter_index).unwrap(); - bytes.extend(decrypter_index); - - bytes + self.0.to_bytes() } #[wasm_bindgen] pub fn from_bytes(bytes: &[u8]) -> Self { - let b_inv_bytes = &bytes[0..B_INV_LEN]; - // Chunking bytes to u64s to construct a BigInteger256. - let b_inv = b_inv_bytes - .chunks(8) - .map(|x| { - let mut bytes = [0u8; 8]; - bytes.copy_from_slice(x); - u64::from_le_bytes(bytes) - }) - .collect::>(); - let b_inv: [u64; 4] = b_inv.try_into().unwrap(); - let b_inv = ark_bls12_381::Fr::new(BigInteger256::new(b_inv)); - - let decrypter_index_bytes = - &bytes[B_INV_LEN..B_INV_LEN + DECRYPTER_INDEX_LEN]; - let decrypter_index = - bincode::deserialize(decrypter_index_bytes).unwrap(); - - Self { - b_inv, - decrypter_index, - } + Self(tpke::api::PrivateDecryptionContext::from_bytes(bytes)) } } #[wasm_bindgen] #[derive(Clone, Debug)] -pub struct DecryptionShare(TpkeDecryptionShare); +pub struct DecryptionShare(tpke::api::DecryptionShare); #[wasm_bindgen] impl DecryptionShare { @@ -102,18 +52,14 @@ impl DecryptionShare { #[wasm_bindgen] pub fn from_bytes(bytes: &[u8]) -> Self { - let share = TpkeDecryptionShare::from_bytes(bytes); + let share = tpke::api::DecryptionShare::from_bytes(bytes); Self(share) } } #[wasm_bindgen] #[derive(Clone, Debug)] -pub struct ParticipantPayload { - decryption_context: PrivateDecryptionContext, - // Using inner type here because `ciphertext` is never accessed from the outside. - ciphertext: TpkeCiphertext, -} +pub struct ParticipantPayload(tpke::api::ParticipantPayload); #[wasm_bindgen] impl ParticipantPayload { @@ -122,16 +68,16 @@ impl ParticipantPayload { decryption_context: &PrivateDecryptionContext, ciphertext: &Ciphertext, ) -> Self { - Self { - decryption_context: decryption_context.clone(), - ciphertext: ciphertext.ciphertext.clone(), - } + Self(tpke::api::ParticipantPayload::new( + &decryption_context.0, + &ciphertext.ciphertext, + )) } #[wasm_bindgen] pub fn to_bytes(&self) -> Vec { - let mut bytes = self.decryption_context.to_bytes(); - bytes.extend(&self.ciphertext.to_bytes()); + let mut bytes = self.0.decryption_context.to_bytes(); + bytes.extend(&self.0.ciphertext.to_bytes()); bytes } @@ -146,25 +92,15 @@ impl ParticipantPayload { bytes[PrivateDecryptionContext::serialized_size()..].to_vec(); let ciphertext = tpke::Ciphertext::from_bytes(&ciphertext_bytes); - Self { - decryption_context, + Self(tpke::api::ParticipantPayload { + decryption_context: decryption_context.0, ciphertext, - } + }) } #[wasm_bindgen] pub fn to_decryption_share(&self) -> DecryptionShare { - // TODO: Add verification steps - let decryption_share = self - .ciphertext - .commitment - .mul(self.decryption_context.b_inv) - .into_affine(); - - DecryptionShare(TpkeDecryptionShare { - decrypter_index: self.decryption_context.decrypter_index, - decryption_share, - }) + DecryptionShare(self.0.to_decryption_share()) } } @@ -240,7 +176,11 @@ impl Setup { let private_contexts = contexts .clone() .into_iter() - .map(|x| PrivateDecryptionContext::new(&x.b_inv, x.index)) + .map(|x| { + PrivateDecryptionContext( + tpke::api::PrivateDecryptionContext::new(&x.b_inv, x.index), + ) + }) .collect(); let public_contexts = contexts[0].public_decryption_contexts.to_vec(); @@ -260,7 +200,7 @@ impl Setup { pub fn private_context_at(&self, index: usize) -> PrivateDecryptionContext { set_panic_hook(); let context = self.private_contexts[index].clone(); - assert_eq!(context.decrypter_index, index); + assert_eq!(context.0.decrypter_index, index); context } @@ -269,7 +209,7 @@ impl Setup { set_panic_hook(); self.private_contexts .iter() - .map(|x| x.decrypter_index) + .map(|x| x.0.decrypter_index) .collect() } @@ -334,7 +274,7 @@ impl SharedSecretBuilder { #[wasm_bindgen] pub fn add_decryption_share(&mut self, share: &DecryptionShare) { - self.shares.push(share.0.clone()); + self.shares.push(share.0 .0.clone()); } #[wasm_bindgen] diff --git a/tpke/BENCHMARK.md b/tpke/BENCHMARK.md index 148d0ddc..1e3c61cc 100644 --- a/tpke/BENCHMARK.md +++ b/tpke/BENCHMARK.md @@ -1,6 +1,6 @@ # Benchmarks -## Setup +## Hardware Benchmarks produced on: diff --git a/tpke/src/api.rs b/tpke/src/api.rs new file mode 100644 index 00000000..6ac420f3 --- /dev/null +++ b/tpke/src/api.rs @@ -0,0 +1,145 @@ +//! Contains the public API of the library. + +// TODO: Refactor this module to deduplicate shared code from tpke-wasm and tpke-wasm. + +use std::convert::TryInto; + +use ark_ec::{AffineCurve, ProjectiveCurve}; +use ark_ff::{BigInteger256, ToBytes}; + +// Fixing some of the types here on our target engine +// TODO: Consider fixing on crate::api level instead of bindings level +type E = ark_bls12_381::Bls12_381; +type TpkePublicKey = ark_bls12_381::G1Affine; +type TpkePrivateKey = ark_bls12_381::G2Affine; +type TpkeCiphertext = crate::Ciphertext; +type TpkeDecryptionShare = crate::DecryptionShare; +type TpkePublicDecryptionContext = crate::PublicDecryptionContext; +type TpkeSharedSecret = + ::Fqk; + +#[derive(Clone, Debug)] +pub struct PrivateDecryptionContext { + pub b_inv: ark_bls12_381::Fr, + pub decrypter_index: usize, +} + +impl PrivateDecryptionContext { + const B_INV_LEN: usize = 32; + const DECRYPTER_INDEX_LEN: usize = 8; + + pub fn new(b_inv: &ark_bls12_381::Fr, decrypter_index: usize) -> Self { + Self { + b_inv: *b_inv, + decrypter_index, + } + } + + pub fn serialized_size() -> usize { + Self::B_INV_LEN + Self::DECRYPTER_INDEX_LEN + } + + pub fn to_bytes(&self) -> Vec { + let mut bytes = Vec::new(); + self.b_inv.0.write(&mut bytes).unwrap(); + + let decrypter_index = + bincode::serialize(&self.decrypter_index).unwrap(); + bytes.extend(decrypter_index); + + bytes + } + + pub fn from_bytes(bytes: &[u8]) -> Self { + let b_inv_bytes = &bytes[0..Self::B_INV_LEN]; + // Chunking bytes to u64s to construct a BigInteger256. + let b_inv = b_inv_bytes + .chunks(8) + .map(|x| { + let mut bytes = [0u8; 8]; + bytes.copy_from_slice(x); + u64::from_le_bytes(bytes) + }) + .collect::>(); + let b_inv: [u64; 4] = b_inv.try_into().unwrap(); + let b_inv = ark_bls12_381::Fr::new(BigInteger256::new(b_inv)); + + let decrypter_index_bytes = &bytes + [Self::B_INV_LEN..Self::B_INV_LEN + Self::DECRYPTER_INDEX_LEN]; + let decrypter_index = + bincode::deserialize(decrypter_index_bytes).unwrap(); + + Self { + b_inv, + decrypter_index, + } + } +} + +#[derive(Clone, Debug)] +pub struct DecryptionShare(pub TpkeDecryptionShare); + +impl DecryptionShare { + pub fn to_bytes(&self) -> Vec { + self.0.to_bytes() + } + + pub fn from_bytes(bytes: &[u8]) -> Self { + let share = TpkeDecryptionShare::from_bytes(bytes); + Self(share) + } +} + +#[derive(Clone, Debug)] +pub struct ParticipantPayload { + pub decryption_context: PrivateDecryptionContext, + pub ciphertext: TpkeCiphertext, +} +impl ParticipantPayload { + pub fn new( + decryption_context: &PrivateDecryptionContext, + ciphertext: &TpkeCiphertext, + ) -> Self { + Self { + decryption_context: decryption_context.clone(), + ciphertext: ciphertext.clone(), + } + } + + pub fn to_bytes(&self) -> Vec { + let mut bytes = self.decryption_context.to_bytes(); + bytes.extend(&self.ciphertext.to_bytes()); + bytes + } + + pub fn from_bytes(bytes: &[u8]) -> Self { + let decryption_context_bytes = + &bytes[0..PrivateDecryptionContext::serialized_size()]; + let decryption_context = + PrivateDecryptionContext::from_bytes(decryption_context_bytes); + + let ciphertext_bytes = + bytes[PrivateDecryptionContext::serialized_size()..].to_vec(); + let ciphertext: crate::Ciphertext = + crate::Ciphertext::from_bytes(&ciphertext_bytes); + + Self { + decryption_context, + ciphertext, + } + } + + pub fn to_decryption_share(&self) -> DecryptionShare { + // TODO: Add verification steps + let decryption_share = self + .ciphertext + .commitment + .mul(self.decryption_context.b_inv) + .into_affine(); + + DecryptionShare(TpkeDecryptionShare { + decrypter_index: self.decryption_context.decrypter_index, + decryption_share, + }) + } +} diff --git a/tpke/src/lib.rs b/tpke/src/lib.rs index d19c6236..d1a1277d 100644 --- a/tpke/src/lib.rs +++ b/tpke/src/lib.rs @@ -24,7 +24,9 @@ mod combine; pub use combine::*; mod context; pub use context::*; -// TODO: Turn into a crate feature + +// TODO: Turn into a crate features +pub mod api; pub mod serialization; pub trait ThresholdEncryptionParameters {