From 3aabdda31855e224a9e299c623ee7845df065296 Mon Sep 17 00:00:00 2001
From: Alexandr Kitaev <makavity231@gmail.com>
Date: Wed, 22 Oct 2025 13:52:14 +0300
Subject: [PATCH 01/16] Implement STB 34.101.77-2020

---
 .github/workflows/belt-bash.yml |  92 +++++++++
 Cargo.lock                      |   4 +
 Cargo.toml                      |   1 +
 belt-bash/CHANGELOG.md          |   8 +
 belt-bash/Cargo.toml            |  16 ++
 belt-bash/LICENSE-APACHE        | 201 +++++++++++++++++++
 belt-bash/LICENSE-MIT           |  25 +++
 belt-bash/README.md             |  50 +++++
 belt-bash/src/lib.rs            | 337 ++++++++++++++++++++++++++++++++
 9 files changed, 734 insertions(+)
 create mode 100644 .github/workflows/belt-bash.yml
 create mode 100644 belt-bash/CHANGELOG.md
 create mode 100644 belt-bash/Cargo.toml
 create mode 100644 belt-bash/LICENSE-APACHE
 create mode 100644 belt-bash/LICENSE-MIT
 create mode 100644 belt-bash/README.md
 create mode 100644 belt-bash/src/lib.rs

diff --git a/.github/workflows/belt-bash.yml b/.github/workflows/belt-bash.yml
new file mode 100644
index 0000000..2ad851f
--- /dev/null
+++ b/.github/workflows/belt-bash.yml
@@ -0,0 +1,92 @@
+name: belt-bash
+
+on:
+  pull_request:
+    paths:
+      - ".github/workflows/belt-bash.yml"
+      - "belt-bash/**"
+      - "Cargo.*"
+  push:
+    branches: master
+
+defaults:
+  run:
+    working-directory: belt-bash
+
+env:
+  RUSTFLAGS: "-Dwarnings"
+  CARGO_INCREMENTAL: 0
+
+jobs:
+  set-msrv:
+    uses: RustCrypto/actions/.github/workflows/set-msrv.yml@master
+    with:
+      msrv: 1.85.0
+
+  build:
+    needs: set-msrv
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - ${{needs.set-msrv.outputs.msrv}}
+          - stable
+        target:
+          - thumbv7em-none-eabi
+          - wasm32-unknown-unknown
+    steps:
+      - uses: actions/checkout@v4
+      - uses: RustCrypto/actions/cargo-cache@master
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ matrix.rust }}
+          targets: ${{ matrix.target }}
+      - run: cargo build --no-default-features --target ${{ matrix.target }}
+
+  minimal-versions:
+    uses: RustCrypto/actions/.github/workflows/minimal-versions.yml@master
+    with:
+      working-directory: ${{ github.workflow }}
+
+  test:
+    needs: set-msrv
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - ${{needs.set-msrv.outputs.msrv}}
+          - stable
+    steps:
+      - uses: actions/checkout@v4
+      - uses: RustCrypto/actions/cargo-cache@master
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ matrix.rust }}
+      - run: cargo test --no-default-features
+      - run: cargo test
+      - run: cargo test --all-features
+
+  miri:
+    runs-on: ubuntu-latest
+    env:
+      MIRIFLAGS: "-Zmiri-symbolic-alignment-check -Zmiri-strict-provenance"
+    strategy:
+      matrix:
+        target:
+          - x86_64-unknown-linux-gnu
+          - s390x-unknown-linux-gnu
+    steps:
+      - uses: actions/checkout@v4
+      - uses: RustCrypto/actions/cargo-cache@master
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: nightly
+      - name: Install Miri
+        run: |
+          rustup component add miri
+          cargo miri setup
+      - name: Test with Miri
+        run: |
+          cargo miri test --target ${{ matrix.target }} --no-default-features
+          cargo miri test --target ${{ matrix.target }}
+          cargo miri test --target ${{ matrix.target }} --all-features
diff --git a/Cargo.lock b/Cargo.lock
index 3d67e6f..b49f700 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -9,6 +9,10 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "bash"
+version = "0.1.0-rc.0"
+
 [[package]]
 name = "cpufeatures"
 version = "0.2.17"
diff --git a/Cargo.toml b/Cargo.toml
index cf8ac35..66c9f59 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,5 +2,6 @@
 resolver = "2"
 members = [
     "ascon",
+    "belt-bash",
     "keccak",
 ]
diff --git a/belt-bash/CHANGELOG.md b/belt-bash/CHANGELOG.md
new file mode 100644
index 0000000..1bc6963
--- /dev/null
+++ b/belt-bash/CHANGELOG.md
@@ -0,0 +1,8 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## 0.1.0 (UNRELEASED)
diff --git a/belt-bash/Cargo.toml b/belt-bash/Cargo.toml
new file mode 100644
index 0000000..388c4a4
--- /dev/null
+++ b/belt-bash/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "bash"
+version = "0.1.0-rc.0"
+description = "Pure Rust implementation of the BASH algorithms defined in STB 34.101.77-2020"
+license = "Apache-2.0 OR MIT"
+authors = ["RustCrypto Developers"]
+documentation = "https://docs.rs/bash"
+homepage = "https://github.com/RustCrypto/sponges/tree/master/bash"
+repository = "https://github.com/RustCrypto/sponges"
+keywords = ["Bash", "belt", "permutation"]
+categories = ["cryptography", "no-std"]
+readme = "README.md"
+edition = "2024"
+rust-version = "1.85"
+
+[dependencies]
diff --git a/belt-bash/LICENSE-APACHE b/belt-bash/LICENSE-APACHE
new file mode 100644
index 0000000..59aa0f4
--- /dev/null
+++ b/belt-bash/LICENSE-APACHE
@@ -0,0 +1,201 @@
+                              Apache License
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+                     http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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+5. Submission of Contributions. Unless You explicitly state otherwise,
+   any Contribution intentionally submitted for inclusion in the Work
+   by You to the Licensor shall be under the terms and conditions of
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+   Notwithstanding the above, nothing herein shall supersede or modify
+   the terms of any separate license agreement you may have executed
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+6. Trademarks. This License does not grant permission to use the trade
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+   of your accepting any such warranty or additional liability.
+
+END OF TERMS AND CONDITIONS
+
+APPENDIX: How to apply the Apache License to your work.
+
+   To apply the Apache License to your work, attach the following
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+Unless required by applicable law or agreed to in writing, software
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\ No newline at end of file
diff --git a/belt-bash/LICENSE-MIT b/belt-bash/LICENSE-MIT
new file mode 100644
index 0000000..3b2f02c
--- /dev/null
+++ b/belt-bash/LICENSE-MIT
@@ -0,0 +1,25 @@
+Copyright (c) 2025 The RustCrypto Project Developers
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
\ No newline at end of file
diff --git a/belt-bash/README.md b/belt-bash/README.md
new file mode 100644
index 0000000..f101e01
--- /dev/null
+++ b/belt-bash/README.md
@@ -0,0 +1,50 @@
+# RustCrypto: BeltBash
+
+[![crate][crate-image]][crate-link]
+[![Docs][docs-image]][docs-link]
+![Apache2/MIT licensed][license-image]
+![Rust Version][rustc-image]
+[![Project Chat][chat-image]][chat-link]
+[![Build Status][build-image]][build-link]
+
+Pure Rust implementation of the `bash` sponge algorithms
+specified in the republic of Belarus standard [STB 34.101.77-2020].
+
+## Security Notes
+
+No security audits of this crate have ever been performed, and it has not been thoroughly assessed to ensure its operation is constant-time on common CPU architectures.
+
+USE AT YOUR OWN RISK!
+
+## License
+
+Licensed under either of:
+
+* [Apache License, Version 2.0](https://www.apache.org/licenses/LICENSE-2.0)
+* [MIT license](https://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
+dual licensed as above, without any additional terms or conditions.
+
+[//]: # (badges)
+
+[crate-image]: https://buildstats.info/crate/belt-bash
+[crate-link]: https://crates.io/crates/belt-bash
+[docs-image]: https://docs.rs/belt-bash/badge.svg
+[docs-link]: https://docs.rs/belt-bash/
+[license-image]: https://img.shields.io/badge/license-Apache2.0/MIT-blue.svg
+[rustc-image]: https://img.shields.io/badge/rustc-1.85+-blue.svg
+[chat-image]: https://img.shields.io/badge/zulip-join_chat-blue.svg
+[chat-link]: https://rustcrypto.zulipchat.com/#narrow/stream/260038-AEADs
+[downloads-image]: https://img.shields.io/crates/d/chacha20poly1305.svg
+[build-image]: https://github.com/RustCrypto/AEADs/workflows/belt-bash/badge.svg?branch=master&event=push
+[build-link]: https://github.com/RustCrypto/AEADs/actions
+
+[//]: # (general links)
+
+[STB 34.101.77-2020]: https://apmi.bsu.by/assets/files/std/bash-spec241.pdf
\ No newline at end of file
diff --git a/belt-bash/src/lib.rs b/belt-bash/src/lib.rs
new file mode 100644
index 0000000..52b1a51
--- /dev/null
+++ b/belt-bash/src/lib.rs
@@ -0,0 +1,337 @@
+//! # BelHash - STB 34.101.77-2020 Sponge-Based Cryptographic Algorithms
+//!
+//! This module implements the cryptographic algorithms defined in the Belarusian
+//! state standard STB 34.101.77-2020 "Sponge-based cryptographic algorithms".
+//!
+//! ## Overview
+//!
+//! The standard defines a family of cryptographic algorithms built on a sponge
+//! construction with the `bash-f` sponge function at its core. The sponge function
+//! operates on 1536-bit (192-byte) states.
+//!
+//! ## Components
+//!
+//! ### Core Primitives
+//!
+//! - **bash-s**: S-box transformation operating on three 64-bit words
+//! - **bash-f**: Sponge permutation function (24 rounds)
+//!
+//! ### High-Level Algorithms
+//!
+//! - Hash functions (128-256 bit security levels)
+//! - Authenticated encryption
+//! - AEAD (Authenticated Encryption with Associated Data)
+//!
+//! ## Security Levels
+//!
+//! The standard supports three security levels:
+//! - ℓ = 128 bits
+//! - ℓ = 192 bits
+//! - ℓ = 256 bits
+//!
+//! ## References
+//!
+//! - STB 34.101.77-2020 specification
+//! - [Official standard](http://apmi.bsu.by/assets/files/std/bash-spec324.pdf)
+//!
+//! ## Note on Byte Order
+//!
+//! The specification uses big-endian representation for test vectors, while
+//! internal computation uses little-endian.
+//! The public API handles byte swapping automatically.
+
+#![no_std]
+#![cfg_attr(docsrs, feature(doc_cfg))]
+#![doc(
+    html_logo_url = "https://raw.githubusercontent.com/RustCrypto/meta/master/logo.svg",
+    html_favicon_url = "https://raw.githubusercontent.com/RustCrypto/meta/master/logo.svg"
+)]
+#![allow(non_upper_case_globals)]
+#![warn(
+    clippy::mod_module_files,
+    clippy::unwrap_used,
+    missing_docs,
+    rust_2018_idioms,
+    unused_lifetimes,
+    unused_qualifications
+)]
+
+/// Number of 64-bit words in the state
+const STATE_WORDS: usize = 24;
+
+/// Internal bash-s transformation.
+///
+/// Implements the S-box transformation defined in Section 6.1 of STB 34.101.77-2020.
+/// This is the core non-linear transformation used in the bash-f sponge function.
+fn bash_s_internal(
+    mut w0: u64,
+    mut w1: u64,
+    mut w2: u64,
+    m1: u32,
+    n1: u32,
+    m2: u32,
+    n2: u32,
+) -> (u64, u64, u64) {
+    // 1. T0 ← RotHi^m1(W0)
+    let t0 = w0.rotate_left(m1);
+
+    // 2. W0 ← W0 ⊕ W1 ⊕ W2
+    w0 ^= w1 ^ w2;
+
+    // 3. T1 ← W1 ⊕ RotHi^n1(W0)
+    let t1 = w1 ^ w0.rotate_left(n1);
+
+    // 4. W1 ← T0 ⊕ T1
+    w1 = t0 ^ t1;
+
+    // 5. W2 ← W2 ⊕ RotHi^m2(W2) ⊕ RotHi^n2(T1)
+    w2 ^= w2.rotate_left(m2) ^ t1.rotate_left(n2);
+
+    // 6. T0 ← ¬W2
+    let t0 = !w2;
+
+    // 7. T1 ← W0 ∨ W2
+    let t1 = w0 | w2;
+
+    // 8. T2 ← W0 ∧ W1
+    let t2 = w0 & w1;
+
+    // 9. T0 ← T0 ∨ W1
+    let t0 = t0 | w1;
+
+    // 10. W1 ← W1 ⊕ T1
+    w1 ^= t1;
+
+    // 11. W2 ← W2 ⊕ T2
+    w2 ^= t2;
+
+    // 12. W0 ← W0 ⊕ T0
+    w0 ^= t0;
+
+    // 13. Return (W0, W1, W2)
+    (w0, w1, w2)
+}
+
+/// bash-s transformation with standard-compliant byte order.
+///
+/// This is the public interface to the bash-s algorithm as defined in
+/// Section 6.1 of STB 34.101.77-2020. It handles conversion between
+/// the standard's big-endian representation and the internal little-endian
+/// computation.
+/// ```rust
+/// use bash::bash_s;
+/// let w0 = 0xB194BAC80A08F53B;
+/// let w1 = 0xE12BDC1AE28257EC;
+/// let w2 = 0xE9DEE72C8F0C0FA6;
+/// let (r0, r1, r2) = bash_s(w0, w1, w2, 8, 53, 14, 1);
+/// assert_eq!(r0, 0x479E76129979DC5F);
+/// assert_eq!(r1, 0x0F2B2C93ED128EDD);
+/// assert_eq!(r2, 0x41009B1B112DFEF3);
+/// ```
+pub fn bash_s(w0: u64, w1: u64, w2: u64, m1: u32, n1: u32, m2: u32, n2: u32) -> (u64, u64, u64) {
+    // Convert from big-endian (standard) to little-endian (internal)
+    let (w0_out, w1_out, w2_out) = bash_s_internal(
+        w0.swap_bytes(),
+        w1.swap_bytes(),
+        w2.swap_bytes(),
+        m1,
+        n1,
+        m2,
+        n2,
+    );
+
+    // Convert back to big-endian for output
+    (
+        w0_out.swap_bytes(),
+        w1_out.swap_bytes(),
+        w2_out.swap_bytes(),
+    )
+}
+
+/// Internal bash-f sponge permutation.
+///
+/// Implements the core sponge function defined in Section 6.2 of STB 34.101.77-2020.
+/// This is a cryptographic permutation that operates on 1536-bit states.
+///
+/// # Parameters
+///
+/// - `state`: Mutable reference to 24 × 64-bit words (1536 bits total) in little-endian internal representation
+fn bash_f_internal(state: &mut [u64; STATE_WORDS]) {
+    // 1. Split S into words (S0, S1, ..., S23)
+
+    // 2. C ← B194BAC80A08F53B (initialize round constant, swapped to little-endian)
+    let mut c: u64 = 0xB194BAC80A08F53Bu64.swap_bytes();
+
+    // 3. For i = 1, 2, ..., 24 perform 24 rounds
+    for _ in 0..STATE_WORDS {
+        // 3.1. Apply S-box layer with varying rotation parameters
+        // (m1, n1, m2, n2) ← (8, 53, 14, 1)
+        let mut m1 = 8u32;
+        let mut n1 = 53u32;
+        let mut m2 = 14u32;
+        let mut n2 = 1u32;
+
+        // 3.2. For j = 0, 1, ..., 7 apply bash-s to each of 8 columns
+        for j in 0..8 {
+            // 3.2.a. (Sj, S8+j, S16+j) ← bash-s(Sj, S8+j, S16+j, m1, n1, m2, n2)
+            let (s0, s1, s2) =
+                bash_s_internal(state[j], state[8 + j], state[16 + j], m1, n1, m2, n2);
+            state[j] = s0;
+            state[8 + j] = s1;
+            state[16 + j] = s2;
+
+            // 3.2.b. (m1, n1, m2, n2) ← (7·m1 mod 64, 7·n1 mod 64, 7·m2 mod 64, 7·n2 mod 64)
+            m1 = (7 * m1) % 64;
+            n1 = (7 * n1) % 64;
+            m2 = (7 * m2) % 64;
+            n2 = (7 * n2) % 64;
+        }
+
+        // 3.3. Apply word permutation π
+        // S ← S15 ‖ S10 ‖ S9 ‖ S12 ‖ S11 ‖ S14 ‖ S13 ‖ S8 ‖
+        //     S17 ‖ S16 ‖ S19 ‖ S18 ‖ S21 ‖ S20 ‖ S23 ‖ S22 ‖
+        //     S6 ‖ S3 ‖ S0 ‖ S5 ‖ S2 ‖ S7 ‖ S4 ‖ S1
+        let temp = [
+            state[15], state[10], state[9], state[12], state[11], state[14], state[13], state[8],
+            state[17], state[16], state[19], state[18], state[21], state[20], state[23], state[22],
+            state[6], state[3], state[0], state[5], state[2], state[7], state[4], state[1],
+        ];
+        state.copy_from_slice(&temp);
+
+        // 3.4. S23 ← S23 ⊕ C (add round constant)
+        state[23] ^= c;
+
+        // 3.5. Update LFSR (Galois configuration)
+        // if ⌊C⌉ is even, then C ← ShLo(C)
+        // else C ← ShLo(C) ⊕ AED8E07F99E12BDC
+        if c & 1 == 0 {
+            c >>= 1;
+        } else {
+            c = (c >> 1) ^ 0xAED8E07F99E12BDCu64.swap_bytes();
+        }
+    }
+
+    // 4. Return S - state is modified in place
+}
+
+/// bash-f sponge function with standard-compliant interface.
+///
+/// This is the public interface as specified in Section 6.2 of STB 34.101.77-2020.
+/// It accepts and returns states in big-endian byte order as per the standard.
+///
+/// # Parameters
+///
+/// - `state`: Mutable array of 24 × 64-bit words (192 bytes total) in **big-endian** byte order
+///
+/// # Side Effects
+///
+/// Transforms the state in-place through 24 rounds of the sponge permutation.
+///
+/// # Example from Test Vector (Table A.2)
+///
+/// ```rust
+/// use bash::bash_f;
+/// let mut state: [u64; 24] = [
+///     0xB194BAC80A08F53B, 0x366D008E584A5DE4, 0x8504FA9D1BB6C7AC, 0x252E72C202FDCE0D,
+///     0x5BE3D61217B96181, 0xFE6786AD716B890B, 0x5CB0C0FF33C356B8, 0x35C405AED8E07F99,
+///     0xE12BDC1AE28257EC, 0x703FCCF095EE8DF1, 0xC1AB76389FE678CA, 0xF7C6F860D5BB9C4F,
+///     0xF33C657B637C306A, 0xDD4EA7799EB23D31, 0x3E98B56E27D3BCCF, 0x591E181F4C5AB793,
+///     0xE9DEE72C8F0C0FA6, 0x2DDB49F46F739647, 0x06075316ED247A37, 0x39CBA38303A98BF6,
+///     0x92BD9B1CE5D14101, 0x5445FBC95E4D0EF2, 0x682080AA227D642F, 0x2687F93490405511,
+/// ];
+/// bash_f(&mut state);
+/// assert_eq!(state[0], 0x8FE727775EA7F140);
+/// // ... verify remaining words
+/// ```
+pub fn bash_f(state: &mut [u64; 24]) {
+    state.iter_mut().for_each(|s| *s = s.swap_bytes());
+    bash_f_internal(state);
+    state.iter_mut().for_each(|s| *s = s.swap_bytes());
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    /// Test vector from Table A.1 of STB 34.101.77-2020.
+    #[test]
+    fn test_bash_s_table_a1() {
+        let w0 = 0xB194BAC80A08F53B;
+        let w1 = 0xE12BDC1AE28257EC;
+        let w2 = 0xE9DEE72C8F0C0FA6;
+
+        let (w0_out, w1_out, w2_out) = bash_s(w0, w1, w2, 8, 53, 14, 1);
+
+        assert_eq!(w0_out, 0x479E76129979DC5F);
+        assert_eq!(w1_out, 0x0F2B2C93ED128EDD);
+        assert_eq!(w2_out, 0x41009B1B112DFEF3);
+    }
+
+    /// Test vector from Table A.2 of STB 34.101.77-2020.
+    #[test]
+    fn test_bash_f_table_a2() {
+        let mut state: [u64; 24] = [
+            0xB194BAC80A08F53B,
+            0x366D008E584A5DE4,
+            0x8504FA9D1BB6C7AC,
+            0x252E72C202FDCE0D,
+            0x5BE3D61217B96181,
+            0xFE6786AD716B890B,
+            0x5CB0C0FF33C356B8,
+            0x35C405AED8E07F99,
+            0xE12BDC1AE28257EC,
+            0x703FCCF095EE8DF1,
+            0xC1AB76389FE678CA,
+            0xF7C6F860D5BB9C4F,
+            0xF33C657B637C306A,
+            0xDD4EA7799EB23D31,
+            0x3E98B56E27D3BCCF,
+            0x591E181F4C5AB793,
+            0xE9DEE72C8F0C0FA6,
+            0x2DDB49F46F739647,
+            0x06075316ED247A37,
+            0x39CBA38303A98BF6,
+            0x92BD9B1CE5D14101,
+            0x5445FBC95E4D0EF2,
+            0x682080AA227D642F,
+            0x2687F93490405511,
+        ];
+
+        bash_f(&mut state);
+
+        let expected: [u64; 24] = [
+            0x8FE727775EA7F140,
+            0xB95BB6A200CBB28C,
+            0x7F0809C0C0BC68B7,
+            0xDC5AEDC841BD94E4,
+            0x03630C301FC255DF,
+            0x5B67DB53EF65E376,
+            0xE8A4D797A6172F22,
+            0x71BA48093173D329,
+            0xC3502AC946767326,
+            0xA2891971392D3F70,
+            0x89959F5D61621238,
+            0x655975E00E2132A0,
+            0xD5018CEEDB17731C,
+            0xCD88FC50151D37C0,
+            0xD4A3359506AEDC2E,
+            0x6109511E7703AFBB,
+            0x014642348D8568AA,
+            0x1A5D9868C4C7E6DF,
+            0xA756B1690C7C2608,
+            0xA2DC136F5997AB8F,
+            0xBB3F4D9F033C87CA,
+            0x6070E117F099C409,
+            0x4972ACD9D976214B,
+            0x7CED8E3F8B6E058E,
+        ];
+
+        for i in 0..24 {
+            assert_eq!(
+                state[i], expected[i],
+                "Mismatch at S[{}]: got {:016X}, expected {:016X}",
+                i, state[i], expected[i]
+            );
+        }
+    }
+}

From 237cce8613a7d4ad30965fb3b2058d6cb1054962 Mon Sep 17 00:00:00 2001
From: Alexandr Kitaev <makavity231@gmail.com>
Date: Wed, 22 Oct 2025 16:22:05 +0300
Subject: [PATCH 02/16] `belt-bash`: fixes according to the review

---
 Cargo.lock             |  2 +-
 belt-bash/CHANGELOG.md |  3 ++
 belt-bash/Cargo.toml   | 12 ++++++--
 belt-bash/README.md    | 18 ++++++++++--
 belt-bash/src/lib.rs   | 63 +++++-------------------------------------
 5 files changed, 37 insertions(+), 61 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index b49f700..8bcaac3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -10,7 +10,7 @@ dependencies = [
 ]
 
 [[package]]
-name = "bash"
+name = "belt-bash"
 version = "0.1.0-rc.0"
 
 [[package]]
diff --git a/belt-bash/CHANGELOG.md b/belt-bash/CHANGELOG.md
index 1bc6963..7c2ac0d 100644
--- a/belt-bash/CHANGELOG.md
+++ b/belt-bash/CHANGELOG.md
@@ -6,3 +6,6 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## 0.1.0 (UNRELEASED)
+- Initial release ([#92])
+
+[#92]: (https://github.com/RustCrypto/sponges/pull/92)
\ No newline at end of file
diff --git a/belt-bash/Cargo.toml b/belt-bash/Cargo.toml
index 388c4a4..08f30ec 100644
--- a/belt-bash/Cargo.toml
+++ b/belt-bash/Cargo.toml
@@ -1,5 +1,5 @@
 [package]
-name = "bash"
+name = "belt-bash"
 version = "0.1.0-rc.0"
 description = "Pure Rust implementation of the BASH algorithms defined in STB 34.101.77-2020"
 license = "Apache-2.0 OR MIT"
@@ -13,4 +13,12 @@ readme = "README.md"
 edition = "2024"
 rust-version = "1.85"
 
-[dependencies]
+[lints.rust]
+missing_docs = "warn"
+rust_2018_idioms = "warn"
+unused_lifetimes = "warn"
+unused_qualifications = "warn"
+
+[lints.clippy]
+mod_module_files = "warn"
+unwrap_used = "warn"
diff --git a/belt-bash/README.md b/belt-bash/README.md
index f101e01..fd2e873 100644
--- a/belt-bash/README.md
+++ b/belt-bash/README.md
@@ -7,8 +7,22 @@
 [![Project Chat][chat-image]][chat-link]
 [![Build Status][build-image]][build-link]
 
-Pure Rust implementation of the `bash` sponge algorithms
-specified in the republic of Belarus standard [STB 34.101.77-2020].
+# BelHash - [STB 34.101.77-2020] Sponge-Based Cryptographic Algorithms
+
+This module implements the cryptographic algorithms defined in the Belarusian
+state standard STB 34.101.77-2020 "Sponge-based cryptographic algorithms".
+
+## Overview
+
+The standard defines a family of cryptographic algorithms built on a sponge
+construction with the `bash-f` sponge function at its core. The sponge function
+operates on 1536-bit (192-byte) states.
+
+## Note on Byte Order
+
+The specification uses big-endian representation for test vectors, while
+internal computation uses little-endian.
+The public API handles byte swapping automatically.
 
 ## Security Notes
 
diff --git a/belt-bash/src/lib.rs b/belt-bash/src/lib.rs
index 52b1a51..a20b4f4 100644
--- a/belt-bash/src/lib.rs
+++ b/belt-bash/src/lib.rs
@@ -1,68 +1,19 @@
-//! # BelHash - STB 34.101.77-2020 Sponge-Based Cryptographic Algorithms
-//!
-//! This module implements the cryptographic algorithms defined in the Belarusian
-//! state standard STB 34.101.77-2020 "Sponge-based cryptographic algorithms".
-//!
-//! ## Overview
-//!
-//! The standard defines a family of cryptographic algorithms built on a sponge
-//! construction with the `bash-f` sponge function at its core. The sponge function
-//! operates on 1536-bit (192-byte) states.
-//!
-//! ## Components
-//!
-//! ### Core Primitives
-//!
-//! - **bash-s**: S-box transformation operating on three 64-bit words
-//! - **bash-f**: Sponge permutation function (24 rounds)
-//!
-//! ### High-Level Algorithms
-//!
-//! - Hash functions (128-256 bit security levels)
-//! - Authenticated encryption
-//! - AEAD (Authenticated Encryption with Associated Data)
-//!
-//! ## Security Levels
-//!
-//! The standard supports three security levels:
-//! - ℓ = 128 bits
-//! - ℓ = 192 bits
-//! - ℓ = 256 bits
-//!
-//! ## References
-//!
-//! - STB 34.101.77-2020 specification
-//! - [Official standard](http://apmi.bsu.by/assets/files/std/bash-spec324.pdf)
-//!
-//! ## Note on Byte Order
-//!
-//! The specification uses big-endian representation for test vectors, while
-//! internal computation uses little-endian.
-//! The public API handles byte swapping automatically.
-
 #![no_std]
 #![cfg_attr(docsrs, feature(doc_cfg))]
+#![doc = include_str!("../README.md")]
 #![doc(
     html_logo_url = "https://raw.githubusercontent.com/RustCrypto/meta/master/logo.svg",
     html_favicon_url = "https://raw.githubusercontent.com/RustCrypto/meta/master/logo.svg"
 )]
 #![allow(non_upper_case_globals)]
-#![warn(
-    clippy::mod_module_files,
-    clippy::unwrap_used,
-    missing_docs,
-    rust_2018_idioms,
-    unused_lifetimes,
-    unused_qualifications
-)]
 
 /// Number of 64-bit words in the state
 const STATE_WORDS: usize = 24;
 
-/// Internal bash-s transformation.
+/// Internal `bash-s` transformation.
 ///
 /// Implements the S-box transformation defined in Section 6.1 of STB 34.101.77-2020.
-/// This is the core non-linear transformation used in the bash-f sponge function.
+/// This is the core non-linear transformation used in the `bash-f` sponge function.
 fn bash_s_internal(
     mut w0: u64,
     mut w1: u64,
@@ -112,9 +63,9 @@ fn bash_s_internal(
     (w0, w1, w2)
 }
 
-/// bash-s transformation with standard-compliant byte order.
+/// `bash-s` transformation with standard-compliant byte order.
 ///
-/// This is the public interface to the bash-s algorithm as defined in
+/// This is the public interface to the `bash-s` algorithm as defined in
 /// Section 6.1 of STB 34.101.77-2020. It handles conversion between
 /// the standard's big-endian representation and the internal little-endian
 /// computation.
@@ -148,7 +99,7 @@ pub fn bash_s(w0: u64, w1: u64, w2: u64, m1: u32, n1: u32, m2: u32, n2: u32) ->
     )
 }
 
-/// Internal bash-f sponge permutation.
+/// Internal `bash-f` sponge permutation.
 ///
 /// Implements the core sponge function defined in Section 6.2 of STB 34.101.77-2020.
 /// This is a cryptographic permutation that operates on 1536-bit states.
@@ -214,7 +165,7 @@ fn bash_f_internal(state: &mut [u64; STATE_WORDS]) {
     // 4. Return S - state is modified in place
 }
 
-/// bash-f sponge function with standard-compliant interface.
+/// `bash-f` sponge function with standard-compliant interface.
 ///
 /// This is the public interface as specified in Section 6.2 of STB 34.101.77-2020.
 /// It accepts and returns states in big-endian byte order as per the standard.

From cd4be798c339f05b2b964c6e5dd7a9b36f58b251 Mon Sep 17 00:00:00 2001
From: Alexandr Kitaev <makavity231@gmail.com>
Date: Wed, 22 Oct 2025 16:24:06 +0300
Subject: [PATCH 03/16] `belt-bash`: rename crate in doc test

---
 belt-bash/src/lib.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/belt-bash/src/lib.rs b/belt-bash/src/lib.rs
index a20b4f4..80d4998 100644
--- a/belt-bash/src/lib.rs
+++ b/belt-bash/src/lib.rs
@@ -70,7 +70,7 @@ fn bash_s_internal(
 /// the standard's big-endian representation and the internal little-endian
 /// computation.
 /// ```rust
-/// use bash::bash_s;
+/// use belt_bash::bash_s;
 /// let w0 = 0xB194BAC80A08F53B;
 /// let w1 = 0xE12BDC1AE28257EC;
 /// let w2 = 0xE9DEE72C8F0C0FA6;
@@ -181,7 +181,7 @@ fn bash_f_internal(state: &mut [u64; STATE_WORDS]) {
 /// # Example from Test Vector (Table A.2)
 ///
 /// ```rust
-/// use bash::bash_f;
+/// use belt_bash::bash_f;
 /// let mut state: [u64; 24] = [
 ///     0xB194BAC80A08F53B, 0x366D008E584A5DE4, 0x8504FA9D1BB6C7AC, 0x252E72C202FDCE0D,
 ///     0x5BE3D61217B96181, 0xFE6786AD716B890B, 0x5CB0C0FF33C356B8, 0x35C405AED8E07F99,

From 8d258ff2c516b50298236a030327e51f7d4b0457 Mon Sep 17 00:00:00 2001
From: Alexandr Kitaev <makavity231@gmail.com>
Date: Wed, 22 Oct 2025 16:52:23 +0300
Subject: [PATCH 04/16] `belt-bash`: mv `bash_s_internal` -> `bash_s`, make it
 private

---
 belt-bash/src/lib.rs | 60 +++++++++-----------------------------------
 1 file changed, 12 insertions(+), 48 deletions(-)

diff --git a/belt-bash/src/lib.rs b/belt-bash/src/lib.rs
index 80d4998..2be6ba6 100644
--- a/belt-bash/src/lib.rs
+++ b/belt-bash/src/lib.rs
@@ -10,11 +10,11 @@
 /// Number of 64-bit words in the state
 const STATE_WORDS: usize = 24;
 
-/// Internal `bash-s` transformation.
+/// `bash-s` transformation.
 ///
 /// Implements the S-box transformation defined in Section 6.1 of STB 34.101.77-2020.
 /// This is the core non-linear transformation used in the `bash-f` sponge function.
-fn bash_s_internal(
+fn bash_s(
     mut w0: u64,
     mut w1: u64,
     mut w2: u64,
@@ -63,42 +63,6 @@ fn bash_s_internal(
     (w0, w1, w2)
 }
 
-/// `bash-s` transformation with standard-compliant byte order.
-///
-/// This is the public interface to the `bash-s` algorithm as defined in
-/// Section 6.1 of STB 34.101.77-2020. It handles conversion between
-/// the standard's big-endian representation and the internal little-endian
-/// computation.
-/// ```rust
-/// use belt_bash::bash_s;
-/// let w0 = 0xB194BAC80A08F53B;
-/// let w1 = 0xE12BDC1AE28257EC;
-/// let w2 = 0xE9DEE72C8F0C0FA6;
-/// let (r0, r1, r2) = bash_s(w0, w1, w2, 8, 53, 14, 1);
-/// assert_eq!(r0, 0x479E76129979DC5F);
-/// assert_eq!(r1, 0x0F2B2C93ED128EDD);
-/// assert_eq!(r2, 0x41009B1B112DFEF3);
-/// ```
-pub fn bash_s(w0: u64, w1: u64, w2: u64, m1: u32, n1: u32, m2: u32, n2: u32) -> (u64, u64, u64) {
-    // Convert from big-endian (standard) to little-endian (internal)
-    let (w0_out, w1_out, w2_out) = bash_s_internal(
-        w0.swap_bytes(),
-        w1.swap_bytes(),
-        w2.swap_bytes(),
-        m1,
-        n1,
-        m2,
-        n2,
-    );
-
-    // Convert back to big-endian for output
-    (
-        w0_out.swap_bytes(),
-        w1_out.swap_bytes(),
-        w2_out.swap_bytes(),
-    )
-}
-
 /// Internal `bash-f` sponge permutation.
 ///
 /// Implements the core sponge function defined in Section 6.2 of STB 34.101.77-2020.
@@ -111,7 +75,7 @@ fn bash_f_internal(state: &mut [u64; STATE_WORDS]) {
     // 1. Split S into words (S0, S1, ..., S23)
 
     // 2. C ← B194BAC80A08F53B (initialize round constant, swapped to little-endian)
-    let mut c: u64 = 0xB194BAC80A08F53Bu64.swap_bytes();
+    let mut c: u64 = 0x3BF5080AC8BA94B1;
 
     // 3. For i = 1, 2, ..., 24 perform 24 rounds
     for _ in 0..STATE_WORDS {
@@ -126,7 +90,7 @@ fn bash_f_internal(state: &mut [u64; STATE_WORDS]) {
         for j in 0..8 {
             // 3.2.a. (Sj, S8+j, S16+j) ← bash-s(Sj, S8+j, S16+j, m1, n1, m2, n2)
             let (s0, s1, s2) =
-                bash_s_internal(state[j], state[8 + j], state[16 + j], m1, n1, m2, n2);
+                bash_s(state[j], state[8 + j], state[16 + j], m1, n1, m2, n2);
             state[j] = s0;
             state[8 + j] = s1;
             state[16 + j] = s2;
@@ -138,7 +102,7 @@ fn bash_f_internal(state: &mut [u64; STATE_WORDS]) {
             n2 = (7 * n2) % 64;
         }
 
-        // 3.3. Apply word permutation π
+        // 3.3. Apply word permutation
         // S ← S15 ‖ S10 ‖ S9 ‖ S12 ‖ S11 ‖ S14 ‖ S13 ‖ S8 ‖
         //     S17 ‖ S16 ‖ S19 ‖ S18 ‖ S21 ‖ S20 ‖ S23 ‖ S22 ‖
         //     S6 ‖ S3 ‖ S0 ‖ S5 ‖ S2 ‖ S7 ‖ S4 ‖ S1
@@ -158,7 +122,7 @@ fn bash_f_internal(state: &mut [u64; STATE_WORDS]) {
         if c & 1 == 0 {
             c >>= 1;
         } else {
-            c = (c >> 1) ^ 0xAED8E07F99E12BDCu64.swap_bytes();
+            c = (c >> 1) ^ 0xDC2BE1997FE0D8AE;
         }
     }
 
@@ -207,15 +171,15 @@ mod tests {
     /// Test vector from Table A.1 of STB 34.101.77-2020.
     #[test]
     fn test_bash_s_table_a1() {
-        let w0 = 0xB194BAC80A08F53B;
-        let w1 = 0xE12BDC1AE28257EC;
-        let w2 = 0xE9DEE72C8F0C0FA6;
+        let w0 = 0xB194BAC80A08F53Bu64.swap_bytes();
+        let w1 = 0xE12BDC1AE28257ECu64.swap_bytes();
+        let w2 = 0xE9DEE72C8F0C0FA6u64.swap_bytes();
 
         let (w0_out, w1_out, w2_out) = bash_s(w0, w1, w2, 8, 53, 14, 1);
 
-        assert_eq!(w0_out, 0x479E76129979DC5F);
-        assert_eq!(w1_out, 0x0F2B2C93ED128EDD);
-        assert_eq!(w2_out, 0x41009B1B112DFEF3);
+        assert_eq!(w0_out, 0x479E76129979DC5Fu64.swap_bytes());
+        assert_eq!(w1_out, 0x0F2B2C93ED128EDDu64.swap_bytes());
+        assert_eq!(w2_out, 0x41009B1B112DFEF3u64.swap_bytes());
     }
 
     /// Test vector from Table A.2 of STB 34.101.77-2020.

From 6dc8c10265baa9d67972d24c13bfbaa7e2b9c1be Mon Sep 17 00:00:00 2001
From: Alexandr Kitaev <makavity231@gmail.com>
Date: Wed, 22 Oct 2025 16:54:08 +0300
Subject: [PATCH 05/16] `belt-bash`: format

---
 belt-bash/src/lib.rs | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/belt-bash/src/lib.rs b/belt-bash/src/lib.rs
index 2be6ba6..d795e58 100644
--- a/belt-bash/src/lib.rs
+++ b/belt-bash/src/lib.rs
@@ -89,8 +89,7 @@ fn bash_f_internal(state: &mut [u64; STATE_WORDS]) {
         // 3.2. For j = 0, 1, ..., 7 apply bash-s to each of 8 columns
         for j in 0..8 {
             // 3.2.a. (Sj, S8+j, S16+j) ← bash-s(Sj, S8+j, S16+j, m1, n1, m2, n2)
-            let (s0, s1, s2) =
-                bash_s(state[j], state[8 + j], state[16 + j], m1, n1, m2, n2);
+            let (s0, s1, s2) = bash_s(state[j], state[8 + j], state[16 + j], m1, n1, m2, n2);
             state[j] = s0;
             state[8 + j] = s1;
             state[16 + j] = s2;

From 0caf7b4cec1015b841d2d961f0358d26ce3f6955 Mon Sep 17 00:00:00 2001
From: Alexandr Kitaev <makavity231@gmail.com>
Date: Wed, 22 Oct 2025 17:18:06 +0300
Subject: [PATCH 06/16] `belt-bash`: move `bash-f` to /test, remove unnecessary
 warns

---
 belt-bash/Cargo.toml    |  9 -----
 belt-bash/src/lib.rs    | 89 +----------------------------------------
 belt-bash/tests/bash.rs | 69 ++++++++++++++++++++++++++++++++
 3 files changed, 71 insertions(+), 96 deletions(-)
 create mode 100644 belt-bash/tests/bash.rs

diff --git a/belt-bash/Cargo.toml b/belt-bash/Cargo.toml
index 08f30ec..3ca31e1 100644
--- a/belt-bash/Cargo.toml
+++ b/belt-bash/Cargo.toml
@@ -13,12 +13,3 @@ readme = "README.md"
 edition = "2024"
 rust-version = "1.85"
 
-[lints.rust]
-missing_docs = "warn"
-rust_2018_idioms = "warn"
-unused_lifetimes = "warn"
-unused_qualifications = "warn"
-
-[lints.clippy]
-mod_module_files = "warn"
-unwrap_used = "warn"
diff --git a/belt-bash/src/lib.rs b/belt-bash/src/lib.rs
index d795e58..de422cd 100644
--- a/belt-bash/src/lib.rs
+++ b/belt-bash/src/lib.rs
@@ -1,11 +1,11 @@
 #![no_std]
-#![cfg_attr(docsrs, feature(doc_cfg))]
 #![doc = include_str!("../README.md")]
 #![doc(
     html_logo_url = "https://raw.githubusercontent.com/RustCrypto/meta/master/logo.svg",
     html_favicon_url = "https://raw.githubusercontent.com/RustCrypto/meta/master/logo.svg"
 )]
-#![allow(non_upper_case_globals)]
+#![cfg_attr(docsrs, feature(doc_cfg))]
+#![warn(missing_docs)]
 
 /// Number of 64-bit words in the state
 const STATE_WORDS: usize = 24;
@@ -140,23 +140,6 @@ fn bash_f_internal(state: &mut [u64; STATE_WORDS]) {
 /// # Side Effects
 ///
 /// Transforms the state in-place through 24 rounds of the sponge permutation.
-///
-/// # Example from Test Vector (Table A.2)
-///
-/// ```rust
-/// use belt_bash::bash_f;
-/// let mut state: [u64; 24] = [
-///     0xB194BAC80A08F53B, 0x366D008E584A5DE4, 0x8504FA9D1BB6C7AC, 0x252E72C202FDCE0D,
-///     0x5BE3D61217B96181, 0xFE6786AD716B890B, 0x5CB0C0FF33C356B8, 0x35C405AED8E07F99,
-///     0xE12BDC1AE28257EC, 0x703FCCF095EE8DF1, 0xC1AB76389FE678CA, 0xF7C6F860D5BB9C4F,
-///     0xF33C657B637C306A, 0xDD4EA7799EB23D31, 0x3E98B56E27D3BCCF, 0x591E181F4C5AB793,
-///     0xE9DEE72C8F0C0FA6, 0x2DDB49F46F739647, 0x06075316ED247A37, 0x39CBA38303A98BF6,
-///     0x92BD9B1CE5D14101, 0x5445FBC95E4D0EF2, 0x682080AA227D642F, 0x2687F93490405511,
-/// ];
-/// bash_f(&mut state);
-/// assert_eq!(state[0], 0x8FE727775EA7F140);
-/// // ... verify remaining words
-/// ```
 pub fn bash_f(state: &mut [u64; 24]) {
     state.iter_mut().for_each(|s| *s = s.swap_bytes());
     bash_f_internal(state);
@@ -180,72 +163,4 @@ mod tests {
         assert_eq!(w1_out, 0x0F2B2C93ED128EDDu64.swap_bytes());
         assert_eq!(w2_out, 0x41009B1B112DFEF3u64.swap_bytes());
     }
-
-    /// Test vector from Table A.2 of STB 34.101.77-2020.
-    #[test]
-    fn test_bash_f_table_a2() {
-        let mut state: [u64; 24] = [
-            0xB194BAC80A08F53B,
-            0x366D008E584A5DE4,
-            0x8504FA9D1BB6C7AC,
-            0x252E72C202FDCE0D,
-            0x5BE3D61217B96181,
-            0xFE6786AD716B890B,
-            0x5CB0C0FF33C356B8,
-            0x35C405AED8E07F99,
-            0xE12BDC1AE28257EC,
-            0x703FCCF095EE8DF1,
-            0xC1AB76389FE678CA,
-            0xF7C6F860D5BB9C4F,
-            0xF33C657B637C306A,
-            0xDD4EA7799EB23D31,
-            0x3E98B56E27D3BCCF,
-            0x591E181F4C5AB793,
-            0xE9DEE72C8F0C0FA6,
-            0x2DDB49F46F739647,
-            0x06075316ED247A37,
-            0x39CBA38303A98BF6,
-            0x92BD9B1CE5D14101,
-            0x5445FBC95E4D0EF2,
-            0x682080AA227D642F,
-            0x2687F93490405511,
-        ];
-
-        bash_f(&mut state);
-
-        let expected: [u64; 24] = [
-            0x8FE727775EA7F140,
-            0xB95BB6A200CBB28C,
-            0x7F0809C0C0BC68B7,
-            0xDC5AEDC841BD94E4,
-            0x03630C301FC255DF,
-            0x5B67DB53EF65E376,
-            0xE8A4D797A6172F22,
-            0x71BA48093173D329,
-            0xC3502AC946767326,
-            0xA2891971392D3F70,
-            0x89959F5D61621238,
-            0x655975E00E2132A0,
-            0xD5018CEEDB17731C,
-            0xCD88FC50151D37C0,
-            0xD4A3359506AEDC2E,
-            0x6109511E7703AFBB,
-            0x014642348D8568AA,
-            0x1A5D9868C4C7E6DF,
-            0xA756B1690C7C2608,
-            0xA2DC136F5997AB8F,
-            0xBB3F4D9F033C87CA,
-            0x6070E117F099C409,
-            0x4972ACD9D976214B,
-            0x7CED8E3F8B6E058E,
-        ];
-
-        for i in 0..24 {
-            assert_eq!(
-                state[i], expected[i],
-                "Mismatch at S[{}]: got {:016X}, expected {:016X}",
-                i, state[i], expected[i]
-            );
-        }
-    }
 }
diff --git a/belt-bash/tests/bash.rs b/belt-bash/tests/bash.rs
new file mode 100644
index 0000000..72971bd
--- /dev/null
+++ b/belt-bash/tests/bash.rs
@@ -0,0 +1,69 @@
+use belt_bash::bash_f;
+
+/// Test vector from Table A.2 of STB 34.101.77-2020.
+#[test]
+fn test_bash_f_table_a2() {
+    let mut state: [u64; 24] = [
+        0xB194BAC80A08F53B,
+        0x366D008E584A5DE4,
+        0x8504FA9D1BB6C7AC,
+        0x252E72C202FDCE0D,
+        0x5BE3D61217B96181,
+        0xFE6786AD716B890B,
+        0x5CB0C0FF33C356B8,
+        0x35C405AED8E07F99,
+        0xE12BDC1AE28257EC,
+        0x703FCCF095EE8DF1,
+        0xC1AB76389FE678CA,
+        0xF7C6F860D5BB9C4F,
+        0xF33C657B637C306A,
+        0xDD4EA7799EB23D31,
+        0x3E98B56E27D3BCCF,
+        0x591E181F4C5AB793,
+        0xE9DEE72C8F0C0FA6,
+        0x2DDB49F46F739647,
+        0x06075316ED247A37,
+        0x39CBA38303A98BF6,
+        0x92BD9B1CE5D14101,
+        0x5445FBC95E4D0EF2,
+        0x682080AA227D642F,
+        0x2687F93490405511,
+    ];
+
+    bash_f(&mut state);
+
+    let expected: [u64; 24] = [
+        0x8FE727775EA7F140,
+        0xB95BB6A200CBB28C,
+        0x7F0809C0C0BC68B7,
+        0xDC5AEDC841BD94E4,
+        0x03630C301FC255DF,
+        0x5B67DB53EF65E376,
+        0xE8A4D797A6172F22,
+        0x71BA48093173D329,
+        0xC3502AC946767326,
+        0xA2891971392D3F70,
+        0x89959F5D61621238,
+        0x655975E00E2132A0,
+        0xD5018CEEDB17731C,
+        0xCD88FC50151D37C0,
+        0xD4A3359506AEDC2E,
+        0x6109511E7703AFBB,
+        0x014642348D8568AA,
+        0x1A5D9868C4C7E6DF,
+        0xA756B1690C7C2608,
+        0xA2DC136F5997AB8F,
+        0xBB3F4D9F033C87CA,
+        0x6070E117F099C409,
+        0x4972ACD9D976214B,
+        0x7CED8E3F8B6E058E,
+    ];
+
+    for i in 0..24 {
+        assert_eq!(
+            state[i], expected[i],
+            "Mismatch at S[{}]: got {:016X}, expected {:016X}",
+            i, state[i], expected[i]
+        );
+    }
+}

From c041bf75d1635a812ba90dc5835e806a0606cb58 Mon Sep 17 00:00:00 2001
From: Alexandr Kitaev <makavity231@gmail.com>
Date: Wed, 22 Oct 2025 17:29:05 +0300
Subject: [PATCH 07/16] `belt-bash`: simplify test, description fix

---
 belt-bash/Cargo.toml    | 2 +-
 belt-bash/tests/bash.rs | 8 +-------
 2 files changed, 2 insertions(+), 8 deletions(-)

diff --git a/belt-bash/Cargo.toml b/belt-bash/Cargo.toml
index 3ca31e1..884f5fc 100644
--- a/belt-bash/Cargo.toml
+++ b/belt-bash/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "belt-bash"
 version = "0.1.0-rc.0"
-description = "Pure Rust implementation of the BASH algorithms defined in STB 34.101.77-2020"
+description = "Pure Rust implementation of the bash-f sponge function defined in STB 34.101.77-2020"
 license = "Apache-2.0 OR MIT"
 authors = ["RustCrypto Developers"]
 documentation = "https://docs.rs/bash"
diff --git a/belt-bash/tests/bash.rs b/belt-bash/tests/bash.rs
index 72971bd..4d46d38 100644
--- a/belt-bash/tests/bash.rs
+++ b/belt-bash/tests/bash.rs
@@ -59,11 +59,5 @@ fn test_bash_f_table_a2() {
         0x7CED8E3F8B6E058E,
     ];
 
-    for i in 0..24 {
-        assert_eq!(
-            state[i], expected[i],
-            "Mismatch at S[{}]: got {:016X}, expected {:016X}",
-            i, state[i], expected[i]
-        );
-    }
+    assert_eq!(state, expected);
 }

From e0f862af925c47e2c99832381920f994b10fb3ad Mon Sep 17 00:00:00 2001
From: Alexandr Kitaev <makavity231@gmail.com>
Date: Wed, 22 Oct 2025 19:59:36 +0300
Subject: [PATCH 08/16] `belt-bash`: clarify implementation, remove `bash_f`
 internal

---
 belt-bash/src/lib.rs    | 30 +++++-------------------------
 belt-bash/tests/bash.rs | 15 +++++++++++----
 2 files changed, 16 insertions(+), 29 deletions(-)

diff --git a/belt-bash/src/lib.rs b/belt-bash/src/lib.rs
index de422cd..84939e6 100644
--- a/belt-bash/src/lib.rs
+++ b/belt-bash/src/lib.rs
@@ -63,7 +63,7 @@ fn bash_s(
     (w0, w1, w2)
 }
 
-/// Internal `bash-f` sponge permutation.
+/// `bash-f` sponge permutation.
 ///
 /// Implements the core sponge function defined in Section 6.2 of STB 34.101.77-2020.
 /// This is a cryptographic permutation that operates on 1536-bit states.
@@ -71,7 +71,7 @@ fn bash_s(
 /// # Parameters
 ///
 /// - `state`: Mutable reference to 24 × 64-bit words (1536 bits total) in little-endian internal representation
-fn bash_f_internal(state: &mut [u64; STATE_WORDS]) {
+pub fn bash_f(state: &mut [u64; STATE_WORDS]) {
     // 1. Split S into words (S0, S1, ..., S23)
 
     // 2. C ← B194BAC80A08F53B (initialize round constant, swapped to little-endian)
@@ -105,12 +105,10 @@ fn bash_f_internal(state: &mut [u64; STATE_WORDS]) {
         // S ← S15 ‖ S10 ‖ S9 ‖ S12 ‖ S11 ‖ S14 ‖ S13 ‖ S8 ‖
         //     S17 ‖ S16 ‖ S19 ‖ S18 ‖ S21 ‖ S20 ‖ S23 ‖ S22 ‖
         //     S6 ‖ S3 ‖ S0 ‖ S5 ‖ S2 ‖ S7 ‖ S4 ‖ S1
-        let temp = [
-            state[15], state[10], state[9], state[12], state[11], state[14], state[13], state[8],
-            state[17], state[16], state[19], state[18], state[21], state[20], state[23], state[22],
-            state[6], state[3], state[0], state[5], state[2], state[7], state[4], state[1],
+        const INDEXES: [usize; STATE_WORDS] = [
+            15, 10, 9, 12, 11, 14, 13, 8, 17, 16, 19, 18, 21, 20, 23, 22, 6, 3, 0, 5, 2, 7, 4, 1,
         ];
-        state.copy_from_slice(&temp);
+        *state = INDEXES.map(|i| state[i]);
 
         // 3.4. S23 ← S23 ⊕ C (add round constant)
         state[23] ^= c;
@@ -128,24 +126,6 @@ fn bash_f_internal(state: &mut [u64; STATE_WORDS]) {
     // 4. Return S - state is modified in place
 }
 
-/// `bash-f` sponge function with standard-compliant interface.
-///
-/// This is the public interface as specified in Section 6.2 of STB 34.101.77-2020.
-/// It accepts and returns states in big-endian byte order as per the standard.
-///
-/// # Parameters
-///
-/// - `state`: Mutable array of 24 × 64-bit words (192 bytes total) in **big-endian** byte order
-///
-/// # Side Effects
-///
-/// Transforms the state in-place through 24 rounds of the sponge permutation.
-pub fn bash_f(state: &mut [u64; 24]) {
-    state.iter_mut().for_each(|s| *s = s.swap_bytes());
-    bash_f_internal(state);
-    state.iter_mut().for_each(|s| *s = s.swap_bytes());
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/belt-bash/tests/bash.rs b/belt-bash/tests/bash.rs
index 4d46d38..213911b 100644
--- a/belt-bash/tests/bash.rs
+++ b/belt-bash/tests/bash.rs
@@ -3,7 +3,7 @@ use belt_bash::bash_f;
 /// Test vector from Table A.2 of STB 34.101.77-2020.
 #[test]
 fn test_bash_f_table_a2() {
-    let mut state: [u64; 24] = [
+    let input: [u64; 24] = [
         0xB194BAC80A08F53B,
         0x366D008E584A5DE4,
         0x8504FA9D1BB6C7AC,
@@ -30,8 +30,6 @@ fn test_bash_f_table_a2() {
         0x2687F93490405511,
     ];
 
-    bash_f(&mut state);
-
     let expected: [u64; 24] = [
         0x8FE727775EA7F140,
         0xB95BB6A200CBB28C,
@@ -59,5 +57,14 @@ fn test_bash_f_table_a2() {
         0x7CED8E3F8B6E058E,
     ];
 
-    assert_eq!(state, expected);
+    // Constants in the spec are given using LE order
+    // For example, in spec when they write B194BAC80A08F53B, they do not mean 0xB194BAC80A08F53B, but 0x3BF5080AC8BA94B1.
+    // https://github.com/RustCrypto/sponges/pull/92#issuecomment-3433315011
+    let mut state = input.map(|x| x.swap_bytes());
+
+    bash_f(&mut state);
+
+    let output = state.map(|x| x.swap_bytes());
+
+    assert_eq!(output, expected);
 }

From 6e4c8e53c9e835237209bb8f89bd66da6a9b811c Mon Sep 17 00:00:00 2001
From: Alexandr Kitaev <makavity231@gmail.com>
Date: Wed, 22 Oct 2025 20:03:46 +0300
Subject: [PATCH 09/16] `belt-bash`: add same comment from `bash_f` test to the
 `bash_s` test.

---
 belt-bash/src/lib.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/belt-bash/src/lib.rs b/belt-bash/src/lib.rs
index 84939e6..2f2c3ff 100644
--- a/belt-bash/src/lib.rs
+++ b/belt-bash/src/lib.rs
@@ -133,6 +133,9 @@ mod tests {
     /// Test vector from Table A.1 of STB 34.101.77-2020.
     #[test]
     fn test_bash_s_table_a1() {
+        // Constants in the spec are given using LE order
+        // For example, in spec when they write B194BAC80A08F53B, they do not mean 0xB194BAC80A08F53B, but 0x3BF5080AC8BA94B1.
+        // https://github.com/RustCrypto/sponges/pull/92#issuecomment-3433315011
         let w0 = 0xB194BAC80A08F53Bu64.swap_bytes();
         let w1 = 0xE12BDC1AE28257ECu64.swap_bytes();
         let w2 = 0xE9DEE72C8F0C0FA6u64.swap_bytes();

From ba0a61acaf5ff25d11560293842616a6efa3e7c9 Mon Sep 17 00:00:00 2001
From: Alexandr Kitaev <makavity231@gmail.com>
Date: Wed, 22 Oct 2025 20:11:42 +0300
Subject: [PATCH 10/16] `belt-bash`: precalculate m1, n1, m2, n2

---
 belt-bash/src/lib.rs | 44 ++++++++++++++++++++++++++++++++++----------
 1 file changed, 34 insertions(+), 10 deletions(-)

diff --git a/belt-bash/src/lib.rs b/belt-bash/src/lib.rs
index 2f2c3ff..838fefc 100644
--- a/belt-bash/src/lib.rs
+++ b/belt-bash/src/lib.rs
@@ -10,6 +10,38 @@
 /// Number of 64-bit words in the state
 const STATE_WORDS: usize = 24;
 
+/// Precalculated rotation params
+/// ```ignore
+/// const ROTATION_PARAMS: [(u32, u32, u32, u32); 8] = {
+///     let mut params = [(0u32, 0u32, 0u32, 0u32); 8];
+///     let mut m1 = 8u32;
+///     let mut n1 = 53u32;
+///     let mut m2 = 14u32;
+///     let mut n2 = 1u32;
+///
+///     let mut j = 0;
+///     while j < 8 {
+///         params[j] = (m1, n1, m2, n2);
+///         m1 = (7 * m1) % 64;
+///         n1 = (7 * n1) % 64;
+///         m2 = (7 * m2) % 64;
+///         n2 = (7 * n2) % 64;
+///         j += 1;
+///     }
+///     params
+/// };
+/// ```
+const ROTATION_PARAMS: [(u32, u32, u32, u32); 8] = [
+    (8, 53, 14, 1),      // j=0
+    (56, 51, 34, 7),     // j=1: (7*8%64, 7*53%64, 7*14%64, 7*1%64)
+    (8, 37, 46, 49),     // j=2: (7*56%64, 7*51%64, 7*34%64, 7*7%64)
+    (56, 3, 2, 23),      // j=3
+    (8, 21, 14, 33),     // j=4
+    (56, 19, 34, 39),    // j=5
+    (8, 5, 46, 17),      // j=6
+    (56, 35, 2, 55),     // j=7
+];
+
 /// `bash-s` transformation.
 ///
 /// Implements the S-box transformation defined in Section 6.1 of STB 34.101.77-2020.
@@ -81,24 +113,16 @@ pub fn bash_f(state: &mut [u64; STATE_WORDS]) {
     for _ in 0..STATE_WORDS {
         // 3.1. Apply S-box layer with varying rotation parameters
         // (m1, n1, m2, n2) ← (8, 53, 14, 1)
-        let mut m1 = 8u32;
-        let mut n1 = 53u32;
-        let mut m2 = 14u32;
-        let mut n2 = 1u32;
 
         // 3.2. For j = 0, 1, ..., 7 apply bash-s to each of 8 columns
         for j in 0..8 {
             // 3.2.a. (Sj, S8+j, S16+j) ← bash-s(Sj, S8+j, S16+j, m1, n1, m2, n2)
+            // 3.2.b. (m1, n1, m2, n2) ← (7·m1 mod 64, 7·n1 mod 64, 7·m2 mod 64, 7·n2 mod 64)
+            let (m1, n1, m2, n2) = ROTATION_PARAMS[j];
             let (s0, s1, s2) = bash_s(state[j], state[8 + j], state[16 + j], m1, n1, m2, n2);
             state[j] = s0;
             state[8 + j] = s1;
             state[16 + j] = s2;
-
-            // 3.2.b. (m1, n1, m2, n2) ← (7·m1 mod 64, 7·n1 mod 64, 7·m2 mod 64, 7·n2 mod 64)
-            m1 = (7 * m1) % 64;
-            n1 = (7 * n1) % 64;
-            m2 = (7 * m2) % 64;
-            n2 = (7 * n2) % 64;
         }
 
         // 3.3. Apply word permutation

From 2a2a9ee7210676261ae8c46a08a71204bb7a687a Mon Sep 17 00:00:00 2001
From: Alexandr Kitaev <makavity231@gmail.com>
Date: Wed, 22 Oct 2025 20:20:55 +0300
Subject: [PATCH 11/16] `belt-bash`: add benches and no_unroll

---
 belt-bash/Cargo.toml     |  2 +
 belt-bash/benches/mod.rs | 38 +++++++++++++++++++
 belt-bash/src/lib.rs     | 81 ++++++++++++++++++++++++++--------------
 3 files changed, 93 insertions(+), 28 deletions(-)
 create mode 100644 belt-bash/benches/mod.rs

diff --git a/belt-bash/Cargo.toml b/belt-bash/Cargo.toml
index 884f5fc..59ce279 100644
--- a/belt-bash/Cargo.toml
+++ b/belt-bash/Cargo.toml
@@ -13,3 +13,5 @@ readme = "README.md"
 edition = "2024"
 rust-version = "1.85"
 
+[features]
+no_unroll = [] # Do not unroll loops for binary size reduction
\ No newline at end of file
diff --git a/belt-bash/benches/mod.rs b/belt-bash/benches/mod.rs
new file mode 100644
index 0000000..b2fc7e2
--- /dev/null
+++ b/belt-bash/benches/mod.rs
@@ -0,0 +1,38 @@
+#![feature(test)]
+extern crate test;
+
+use belt_bash::bash_f;
+use test::Bencher;
+
+const STATE_WORDS: usize = 24;
+
+#[bench]
+fn bench_bash_f(b: &mut Bencher) {
+    let mut state = [0u64; STATE_WORDS];
+    b.iter(|| {
+        bash_f(test::black_box(&mut state));
+        test::black_box(&state);
+    });
+}
+
+#[bench]
+fn bench_bash_f_10_rounds(b: &mut Bencher) {
+    let mut state = [0u64; STATE_WORDS];
+    b.iter(|| {
+        for _ in 0..10 {
+            bash_f(test::black_box(&mut state));
+        }
+        test::black_box(&state);
+    });
+}
+
+#[bench]
+fn bench_bash_f_100_rounds(b: &mut Bencher) {
+    let mut state = [0u64; STATE_WORDS];
+    b.iter(|| {
+        for _ in 0..100 {
+            bash_f(test::black_box(&mut state));
+        }
+        test::black_box(&state);
+    });
+}
diff --git a/belt-bash/src/lib.rs b/belt-bash/src/lib.rs
index 838fefc..46df841 100644
--- a/belt-bash/src/lib.rs
+++ b/belt-bash/src/lib.rs
@@ -11,35 +11,15 @@
 const STATE_WORDS: usize = 24;
 
 /// Precalculated rotation params
-/// ```ignore
-/// const ROTATION_PARAMS: [(u32, u32, u32, u32); 8] = {
-///     let mut params = [(0u32, 0u32, 0u32, 0u32); 8];
-///     let mut m1 = 8u32;
-///     let mut n1 = 53u32;
-///     let mut m2 = 14u32;
-///     let mut n2 = 1u32;
-///
-///     let mut j = 0;
-///     while j < 8 {
-///         params[j] = (m1, n1, m2, n2);
-///         m1 = (7 * m1) % 64;
-///         n1 = (7 * n1) % 64;
-///         m2 = (7 * m2) % 64;
-///         n2 = (7 * n2) % 64;
-///         j += 1;
-///     }
-///     params
-/// };
-/// ```
 const ROTATION_PARAMS: [(u32, u32, u32, u32); 8] = [
-    (8, 53, 14, 1),      // j=0
-    (56, 51, 34, 7),     // j=1: (7*8%64, 7*53%64, 7*14%64, 7*1%64)
-    (8, 37, 46, 49),     // j=2: (7*56%64, 7*51%64, 7*34%64, 7*7%64)
-    (56, 3, 2, 23),      // j=3
-    (8, 21, 14, 33),     // j=4
-    (56, 19, 34, 39),    // j=5
-    (8, 5, 46, 17),      // j=6
-    (56, 35, 2, 55),     // j=7
+    (8, 53, 14, 1),   // j=0
+    (56, 51, 34, 7),  // j=1: (7*8%64, 7*53%64, 7*14%64, 7*1%64)
+    (8, 37, 46, 49),  // j=2: (7*56%64, 7*51%64, 7*34%64, 7*7%64)
+    (56, 3, 2, 23),   // j=3
+    (8, 21, 14, 33),  // j=4
+    (56, 19, 34, 39), // j=5
+    (8, 5, 46, 17),   // j=6
+    (56, 35, 2, 55),  // j=7
 ];
 
 /// `bash-s` transformation.
@@ -115,6 +95,9 @@ pub fn bash_f(state: &mut [u64; STATE_WORDS]) {
         // (m1, n1, m2, n2) ← (8, 53, 14, 1)
 
         // 3.2. For j = 0, 1, ..., 7 apply bash-s to each of 8 columns
+        // 3.2.a. (Sj, S8+j, S16+j) ← bash-s(Sj, S8+j, S16+j, m1, n1, m2, n2)
+        // 3.2.b. (m1, n1, m2, n2) ← (7·m1 mod 64, 7·n1 mod 64, 7·m2 mod 64, 7·n2 mod 64)
+        #[cfg(feature = "no_unroll")]
         for j in 0..8 {
             // 3.2.a. (Sj, S8+j, S16+j) ← bash-s(Sj, S8+j, S16+j, m1, n1, m2, n2)
             // 3.2.b. (m1, n1, m2, n2) ← (7·m1 mod 64, 7·n1 mod 64, 7·m2 mod 64, 7·n2 mod 64)
@@ -125,6 +108,29 @@ pub fn bash_f(state: &mut [u64; STATE_WORDS]) {
             state[16 + j] = s2;
         }
 
+        #[cfg(not(feature = "no_unroll"))]
+        {
+            macro_rules! apply_s_box {
+                ($j:expr) => {{
+                    let (m1, n1, m2, n2) = ROTATION_PARAMS[$j];
+                    let (s0, s1, s2) =
+                        bash_s(state[$j], state[8 + $j], state[16 + $j], m1, n1, m2, n2);
+                    state[$j] = s0;
+                    state[8 + $j] = s1;
+                    state[16 + $j] = s2;
+                }};
+            }
+
+            apply_s_box!(0);
+            apply_s_box!(1);
+            apply_s_box!(2);
+            apply_s_box!(3);
+            apply_s_box!(4);
+            apply_s_box!(5);
+            apply_s_box!(6);
+            apply_s_box!(7);
+        }
+
         // 3.3. Apply word permutation
         // S ← S15 ‖ S10 ‖ S9 ‖ S12 ‖ S11 ‖ S14 ‖ S13 ‖ S8 ‖
         //     S17 ‖ S16 ‖ S19 ‖ S18 ‖ S21 ‖ S20 ‖ S23 ‖ S22 ‖
@@ -170,4 +176,23 @@ mod tests {
         assert_eq!(w1_out, 0x0F2B2C93ED128EDDu64.swap_bytes());
         assert_eq!(w2_out, 0x41009B1B112DFEF3u64.swap_bytes());
     }
+
+    #[test]
+    /// Verify precalculated params
+    fn verify_rotation_params() {
+        let mut m1 = 8u32;
+        let mut n1 = 53u32;
+        let mut m2 = 14u32;
+        let mut n2 = 1u32;
+
+        for j in 0..8 {
+            let expected = ROTATION_PARAMS[j];
+            assert_eq!((m1, n1, m2, n2), expected);
+
+            m1 = (7 * m1) % 64;
+            n1 = (7 * n1) % 64;
+            m2 = (7 * m2) % 64;
+            n2 = (7 * n2) % 64;
+        }
+    }
 }

From 4e0e1485c1827f666e88ae45a6a8125e86ca9c16 Mon Sep 17 00:00:00 2001
From: Alexandr Kitaev <makavity231@gmail.com>
Date: Wed, 22 Oct 2025 20:25:11 +0300
Subject: [PATCH 12/16] `belt-bash`: Simplify unroll and no_unroll

---
 belt-bash/src/lib.rs | 27 +++++++++++----------------
 1 file changed, 11 insertions(+), 16 deletions(-)

diff --git a/belt-bash/src/lib.rs b/belt-bash/src/lib.rs
index 46df841..ae52cc3 100644
--- a/belt-bash/src/lib.rs
+++ b/belt-bash/src/lib.rs
@@ -97,30 +97,25 @@ pub fn bash_f(state: &mut [u64; STATE_WORDS]) {
         // 3.2. For j = 0, 1, ..., 7 apply bash-s to each of 8 columns
         // 3.2.a. (Sj, S8+j, S16+j) ← bash-s(Sj, S8+j, S16+j, m1, n1, m2, n2)
         // 3.2.b. (m1, n1, m2, n2) ← (7·m1 mod 64, 7·n1 mod 64, 7·m2 mod 64, 7·n2 mod 64)
+        macro_rules! apply_s_box {
+            ($j:expr) => {{
+                let (m1, n1, m2, n2) = ROTATION_PARAMS[$j];
+                let (s0, s1, s2) = bash_s(state[$j], state[8 + $j], state[16 + $j], m1, n1, m2, n2);
+                state[$j] = s0;
+                state[8 + $j] = s1;
+                state[16 + $j] = s2;
+            }};
+        }
+
         #[cfg(feature = "no_unroll")]
         for j in 0..8 {
             // 3.2.a. (Sj, S8+j, S16+j) ← bash-s(Sj, S8+j, S16+j, m1, n1, m2, n2)
             // 3.2.b. (m1, n1, m2, n2) ← (7·m1 mod 64, 7·n1 mod 64, 7·m2 mod 64, 7·n2 mod 64)
-            let (m1, n1, m2, n2) = ROTATION_PARAMS[j];
-            let (s0, s1, s2) = bash_s(state[j], state[8 + j], state[16 + j], m1, n1, m2, n2);
-            state[j] = s0;
-            state[8 + j] = s1;
-            state[16 + j] = s2;
+            apply_s_box!(j);
         }
 
         #[cfg(not(feature = "no_unroll"))]
         {
-            macro_rules! apply_s_box {
-                ($j:expr) => {{
-                    let (m1, n1, m2, n2) = ROTATION_PARAMS[$j];
-                    let (s0, s1, s2) =
-                        bash_s(state[$j], state[8 + $j], state[16 + $j], m1, n1, m2, n2);
-                    state[$j] = s0;
-                    state[8 + $j] = s1;
-                    state[16 + $j] = s2;
-                }};
-            }
-
             apply_s_box!(0);
             apply_s_box!(1);
             apply_s_box!(2);

From e8fb827d5e8a56b7c131338dccdeac4a1d6ebbb4 Mon Sep 17 00:00:00 2001
From: Alexandr Kitaev <makavity231@gmail.com>
Date: Wed, 22 Oct 2025 20:31:18 +0300
Subject: [PATCH 13/16] `bash-f`: rename crate, simplify ROTATION_PARAMS

---
 .../workflows/{belt-bash.yml => bash-f.yml}   |  8 +--
 Cargo.lock                                    |  2 +-
 Cargo.toml                                    |  2 +-
 {belt-bash => bash-f}/CHANGELOG.md            |  0
 {belt-bash => bash-f}/Cargo.toml              |  4 +-
 {belt-bash => bash-f}/LICENSE-APACHE          |  0
 {belt-bash => bash-f}/LICENSE-MIT             |  0
 {belt-bash => bash-f}/README.md               | 10 ++--
 {belt-bash => bash-f}/benches/mod.rs          |  2 +-
 {belt-bash => bash-f}/src/lib.rs              | 49 +++++++------------
 {belt-bash => bash-f}/tests/bash.rs           |  2 +-
 11 files changed, 33 insertions(+), 46 deletions(-)
 rename .github/workflows/{belt-bash.yml => bash-f.yml} (95%)
 rename {belt-bash => bash-f}/CHANGELOG.md (100%)
 rename {belt-bash => bash-f}/Cargo.toml (86%)
 rename {belt-bash => bash-f}/LICENSE-APACHE (100%)
 rename {belt-bash => bash-f}/LICENSE-MIT (100%)
 rename {belt-bash => bash-f}/README.md (87%)
 rename {belt-bash => bash-f}/benches/mod.rs (97%)
 rename {belt-bash => bash-f}/src/lib.rs (83%)
 rename {belt-bash => bash-f}/tests/bash.rs (98%)

diff --git a/.github/workflows/belt-bash.yml b/.github/workflows/bash-f.yml
similarity index 95%
rename from .github/workflows/belt-bash.yml
rename to .github/workflows/bash-f.yml
index 2ad851f..9f08be2 100644
--- a/.github/workflows/belt-bash.yml
+++ b/.github/workflows/bash-f.yml
@@ -1,17 +1,17 @@
-name: belt-bash
+name: bash-f
 
 on:
   pull_request:
     paths:
-      - ".github/workflows/belt-bash.yml"
-      - "belt-bash/**"
+      - "bash-f.yml"
+      - "../../bash-f/**"
       - "Cargo.*"
   push:
     branches: master
 
 defaults:
   run:
-    working-directory: belt-bash
+    working-directory: bash-f
 
 env:
   RUSTFLAGS: "-Dwarnings"
diff --git a/Cargo.lock b/Cargo.lock
index 8bcaac3..1b499e2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -10,7 +10,7 @@ dependencies = [
 ]
 
 [[package]]
-name = "belt-bash"
+name = "bash-f"
 version = "0.1.0-rc.0"
 
 [[package]]
diff --git a/Cargo.toml b/Cargo.toml
index 66c9f59..ee29985 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,6 +2,6 @@
 resolver = "2"
 members = [
     "ascon",
-    "belt-bash",
+    "bash-f",
     "keccak",
 ]
diff --git a/belt-bash/CHANGELOG.md b/bash-f/CHANGELOG.md
similarity index 100%
rename from belt-bash/CHANGELOG.md
rename to bash-f/CHANGELOG.md
diff --git a/belt-bash/Cargo.toml b/bash-f/Cargo.toml
similarity index 86%
rename from belt-bash/Cargo.toml
rename to bash-f/Cargo.toml
index 59ce279..5427b43 100644
--- a/belt-bash/Cargo.toml
+++ b/bash-f/Cargo.toml
@@ -1,5 +1,5 @@
 [package]
-name = "belt-bash"
+name = "bash-f"
 version = "0.1.0-rc.0"
 description = "Pure Rust implementation of the bash-f sponge function defined in STB 34.101.77-2020"
 license = "Apache-2.0 OR MIT"
@@ -14,4 +14,4 @@ edition = "2024"
 rust-version = "1.85"
 
 [features]
-no_unroll = [] # Do not unroll loops for binary size reduction
\ No newline at end of file
+no_unroll = [] # Do not unroll loops for binary size reduction
diff --git a/belt-bash/LICENSE-APACHE b/bash-f/LICENSE-APACHE
similarity index 100%
rename from belt-bash/LICENSE-APACHE
rename to bash-f/LICENSE-APACHE
diff --git a/belt-bash/LICENSE-MIT b/bash-f/LICENSE-MIT
similarity index 100%
rename from belt-bash/LICENSE-MIT
rename to bash-f/LICENSE-MIT
diff --git a/belt-bash/README.md b/bash-f/README.md
similarity index 87%
rename from belt-bash/README.md
rename to bash-f/README.md
index fd2e873..7caf4dd 100644
--- a/belt-bash/README.md
+++ b/bash-f/README.md
@@ -47,16 +47,16 @@ dual licensed as above, without any additional terms or conditions.
 
 [//]: # (badges)
 
-[crate-image]: https://buildstats.info/crate/belt-bash
-[crate-link]: https://crates.io/crates/belt-bash
-[docs-image]: https://docs.rs/belt-bash/badge.svg
-[docs-link]: https://docs.rs/belt-bash/
+[crate-image]: https://buildstats.info/crate/bash-f
+[crate-link]: https://crates.io/crates/bash-f
+[docs-image]: https://docs.rs/bash-f/badge.svg
+[docs-link]: https://docs.rs/bash-f/
 [license-image]: https://img.shields.io/badge/license-Apache2.0/MIT-blue.svg
 [rustc-image]: https://img.shields.io/badge/rustc-1.85+-blue.svg
 [chat-image]: https://img.shields.io/badge/zulip-join_chat-blue.svg
 [chat-link]: https://rustcrypto.zulipchat.com/#narrow/stream/260038-AEADs
 [downloads-image]: https://img.shields.io/crates/d/chacha20poly1305.svg
-[build-image]: https://github.com/RustCrypto/AEADs/workflows/belt-bash/badge.svg?branch=master&event=push
+[build-image]: https://github.com/RustCrypto/AEADs/workflows/bash-f/badge.svg?branch=master&event=push
 [build-link]: https://github.com/RustCrypto/AEADs/actions
 
 [//]: # (general links)
diff --git a/belt-bash/benches/mod.rs b/bash-f/benches/mod.rs
similarity index 97%
rename from belt-bash/benches/mod.rs
rename to bash-f/benches/mod.rs
index b2fc7e2..3c5f2dc 100644
--- a/belt-bash/benches/mod.rs
+++ b/bash-f/benches/mod.rs
@@ -1,7 +1,7 @@
 #![feature(test)]
 extern crate test;
 
-use belt_bash::bash_f;
+use bash_f::bash_f;
 use test::Bencher;
 
 const STATE_WORDS: usize = 24;
diff --git a/belt-bash/src/lib.rs b/bash-f/src/lib.rs
similarity index 83%
rename from belt-bash/src/lib.rs
rename to bash-f/src/lib.rs
index ae52cc3..cd8db0a 100644
--- a/belt-bash/src/lib.rs
+++ b/bash-f/src/lib.rs
@@ -11,16 +11,24 @@
 const STATE_WORDS: usize = 24;
 
 /// Precalculated rotation params
-const ROTATION_PARAMS: [(u32, u32, u32, u32); 8] = [
-    (8, 53, 14, 1),   // j=0
-    (56, 51, 34, 7),  // j=1: (7*8%64, 7*53%64, 7*14%64, 7*1%64)
-    (8, 37, 46, 49),  // j=2: (7*56%64, 7*51%64, 7*34%64, 7*7%64)
-    (56, 3, 2, 23),   // j=3
-    (8, 21, 14, 33),  // j=4
-    (56, 19, 34, 39), // j=5
-    (8, 5, 46, 17),   // j=6
-    (56, 35, 2, 55),  // j=7
-];
+const ROTATION_PARAMS: [(u32, u32, u32, u32); 8] = {
+    let mut params = [(0u32, 0u32, 0u32, 0u32); 8];
+    let mut m1 = 8u32;
+    let mut n1 = 53u32;
+    let mut m2 = 14u32;
+    let mut n2 = 1u32;
+
+    let mut j = 0;
+    while j < 8 {
+        params[j] = (m1, n1, m2, n2);
+        m1 = (7 * m1) % 64;
+        n1 = (7 * n1) % 64;
+        m2 = (7 * m2) % 64;
+        n2 = (7 * n2) % 64;
+        j += 1;
+    }
+    params
+};
 
 /// `bash-s` transformation.
 ///
@@ -109,8 +117,6 @@ pub fn bash_f(state: &mut [u64; STATE_WORDS]) {
 
         #[cfg(feature = "no_unroll")]
         for j in 0..8 {
-            // 3.2.a. (Sj, S8+j, S16+j) ← bash-s(Sj, S8+j, S16+j, m1, n1, m2, n2)
-            // 3.2.b. (m1, n1, m2, n2) ← (7·m1 mod 64, 7·n1 mod 64, 7·m2 mod 64, 7·n2 mod 64)
             apply_s_box!(j);
         }
 
@@ -171,23 +177,4 @@ mod tests {
         assert_eq!(w1_out, 0x0F2B2C93ED128EDDu64.swap_bytes());
         assert_eq!(w2_out, 0x41009B1B112DFEF3u64.swap_bytes());
     }
-
-    #[test]
-    /// Verify precalculated params
-    fn verify_rotation_params() {
-        let mut m1 = 8u32;
-        let mut n1 = 53u32;
-        let mut m2 = 14u32;
-        let mut n2 = 1u32;
-
-        for j in 0..8 {
-            let expected = ROTATION_PARAMS[j];
-            assert_eq!((m1, n1, m2, n2), expected);
-
-            m1 = (7 * m1) % 64;
-            n1 = (7 * n1) % 64;
-            m2 = (7 * m2) % 64;
-            n2 = (7 * n2) % 64;
-        }
-    }
 }
diff --git a/belt-bash/tests/bash.rs b/bash-f/tests/bash.rs
similarity index 98%
rename from belt-bash/tests/bash.rs
rename to bash-f/tests/bash.rs
index 213911b..95ad5df 100644
--- a/belt-bash/tests/bash.rs
+++ b/bash-f/tests/bash.rs
@@ -1,4 +1,4 @@
-use belt_bash::bash_f;
+use bash_f::bash_f;
 
 /// Test vector from Table A.2 of STB 34.101.77-2020.
 #[test]

From 927eb4195f4c33b89acd3afb97b575f72bc5feb5 Mon Sep 17 00:00:00 2001
From: Alexandr Kitaev <makavity231@gmail.com>
Date: Wed, 22 Oct 2025 20:46:35 +0300
Subject: [PATCH 14/16] `bash-f`: fixes, remove no_unroll

---
 .github/workflows/bash-f.yml |  2 +-
 bash-f/Cargo.toml            |  5 +----
 bash-f/README.md             |  2 +-
 bash-f/src/lib.rs            | 34 +++++++---------------------------
 4 files changed, 10 insertions(+), 33 deletions(-)

diff --git a/.github/workflows/bash-f.yml b/.github/workflows/bash-f.yml
index 9f08be2..7614514 100644
--- a/.github/workflows/bash-f.yml
+++ b/.github/workflows/bash-f.yml
@@ -4,7 +4,7 @@ on:
   pull_request:
     paths:
       - "bash-f.yml"
-      - "../../bash-f/**"
+      - "bash-f/**"
       - "Cargo.*"
   push:
     branches: master
diff --git a/bash-f/Cargo.toml b/bash-f/Cargo.toml
index 5427b43..1d105aa 100644
--- a/bash-f/Cargo.toml
+++ b/bash-f/Cargo.toml
@@ -7,11 +7,8 @@ authors = ["RustCrypto Developers"]
 documentation = "https://docs.rs/bash"
 homepage = "https://github.com/RustCrypto/sponges/tree/master/bash"
 repository = "https://github.com/RustCrypto/sponges"
-keywords = ["Bash", "belt", "permutation"]
+keywords = ["bash", "belt", "permutation"]
 categories = ["cryptography", "no-std"]
 readme = "README.md"
 edition = "2024"
 rust-version = "1.85"
-
-[features]
-no_unroll = [] # Do not unroll loops for binary size reduction
diff --git a/bash-f/README.md b/bash-f/README.md
index 7caf4dd..84ea808 100644
--- a/bash-f/README.md
+++ b/bash-f/README.md
@@ -1,4 +1,4 @@
-# RustCrypto: BeltBash
+# RustCrypto: bash-f
 
 [![crate][crate-image]][crate-link]
 [![Docs][docs-image]][docs-link]
diff --git a/bash-f/src/lib.rs b/bash-f/src/lib.rs
index cd8db0a..4ad3499 100644
--- a/bash-f/src/lib.rs
+++ b/bash-f/src/lib.rs
@@ -101,35 +101,15 @@ pub fn bash_f(state: &mut [u64; STATE_WORDS]) {
     for _ in 0..STATE_WORDS {
         // 3.1. Apply S-box layer with varying rotation parameters
         // (m1, n1, m2, n2) ← (8, 53, 14, 1)
-
         // 3.2. For j = 0, 1, ..., 7 apply bash-s to each of 8 columns
-        // 3.2.a. (Sj, S8+j, S16+j) ← bash-s(Sj, S8+j, S16+j, m1, n1, m2, n2)
-        // 3.2.b. (m1, n1, m2, n2) ← (7·m1 mod 64, 7·n1 mod 64, 7·m2 mod 64, 7·n2 mod 64)
-        macro_rules! apply_s_box {
-            ($j:expr) => {{
-                let (m1, n1, m2, n2) = ROTATION_PARAMS[$j];
-                let (s0, s1, s2) = bash_s(state[$j], state[8 + $j], state[16 + $j], m1, n1, m2, n2);
-                state[$j] = s0;
-                state[8 + $j] = s1;
-                state[16 + $j] = s2;
-            }};
-        }
-
-        #[cfg(feature = "no_unroll")]
         for j in 0..8 {
-            apply_s_box!(j);
-        }
-
-        #[cfg(not(feature = "no_unroll"))]
-        {
-            apply_s_box!(0);
-            apply_s_box!(1);
-            apply_s_box!(2);
-            apply_s_box!(3);
-            apply_s_box!(4);
-            apply_s_box!(5);
-            apply_s_box!(6);
-            apply_s_box!(7);
+            // 3.2.a. (Sj, S8+j, S16+j) ← bash-s(Sj, S8+j, S16+j, m1, n1, m2, n2)
+            // 3.2.b. (m1, n1, m2, n2) ← (7·m1 mod 64, 7·n1 mod 64, 7·m2 mod 64, 7·n2 mod 64)
+            let (m1, n1, m2, n2) = ROTATION_PARAMS[j];
+            let (s0, s1, s2) = bash_s(state[j], state[8 + j], state[16 + j], m1, n1, m2, n2);
+            state[j] = s0;
+            state[8 + j] = s1;
+            state[16 + j] = s2;
         }
 
         // 3.3. Apply word permutation

From 02b6a154d3fddcf88114b6fe628a9e4617885084 Mon Sep 17 00:00:00 2001
From: Alexandr Kitaev <makavity231@gmail.com>
Date: Wed, 22 Oct 2025 20:48:11 +0300
Subject: [PATCH 15/16] `bash-f`: STATE_WORDS is now pub

---
 bash-f/benches/mod.rs | 4 +---
 bash-f/src/lib.rs     | 2 +-
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/bash-f/benches/mod.rs b/bash-f/benches/mod.rs
index 3c5f2dc..1fd2a38 100644
--- a/bash-f/benches/mod.rs
+++ b/bash-f/benches/mod.rs
@@ -1,11 +1,9 @@
 #![feature(test)]
 extern crate test;
 
-use bash_f::bash_f;
+use bash_f::{STATE_WORDS, bash_f};
 use test::Bencher;
 
-const STATE_WORDS: usize = 24;
-
 #[bench]
 fn bench_bash_f(b: &mut Bencher) {
     let mut state = [0u64; STATE_WORDS];
diff --git a/bash-f/src/lib.rs b/bash-f/src/lib.rs
index 4ad3499..7ccf440 100644
--- a/bash-f/src/lib.rs
+++ b/bash-f/src/lib.rs
@@ -8,7 +8,7 @@
 #![warn(missing_docs)]
 
 /// Number of 64-bit words in the state
-const STATE_WORDS: usize = 24;
+pub const STATE_WORDS: usize = 24;
 
 /// Precalculated rotation params
 const ROTATION_PARAMS: [(u32, u32, u32, u32); 8] = {

From f10afda76f4426e16fa4528292890f488c6b18a0 Mon Sep 17 00:00:00 2001
From: Alexandr Kitaev <makavity231@gmail.com>
Date: Wed, 22 Oct 2025 21:00:10 +0300
Subject: [PATCH 16/16] `bash-f`: remove precalculation, fix README.md, fix doc

---
 bash-f/README.md  |  6 ------
 bash-f/src/lib.rs | 29 ++++++-----------------------
 2 files changed, 6 insertions(+), 29 deletions(-)

diff --git a/bash-f/README.md b/bash-f/README.md
index 84ea808..8c8b510 100644
--- a/bash-f/README.md
+++ b/bash-f/README.md
@@ -18,12 +18,6 @@ The standard defines a family of cryptographic algorithms built on a sponge
 construction with the `bash-f` sponge function at its core. The sponge function
 operates on 1536-bit (192-byte) states.
 
-## Note on Byte Order
-
-The specification uses big-endian representation for test vectors, while
-internal computation uses little-endian.
-The public API handles byte swapping automatically.
-
 ## Security Notes
 
 No security audits of this crate have ever been performed, and it has not been thoroughly assessed to ensure its operation is constant-time on common CPU architectures.
diff --git a/bash-f/src/lib.rs b/bash-f/src/lib.rs
index 7ccf440..cb578db 100644
--- a/bash-f/src/lib.rs
+++ b/bash-f/src/lib.rs
@@ -10,26 +10,6 @@
 /// Number of 64-bit words in the state
 pub const STATE_WORDS: usize = 24;
 
-/// Precalculated rotation params
-const ROTATION_PARAMS: [(u32, u32, u32, u32); 8] = {
-    let mut params = [(0u32, 0u32, 0u32, 0u32); 8];
-    let mut m1 = 8u32;
-    let mut n1 = 53u32;
-    let mut m2 = 14u32;
-    let mut n2 = 1u32;
-
-    let mut j = 0;
-    while j < 8 {
-        params[j] = (m1, n1, m2, n2);
-        m1 = (7 * m1) % 64;
-        n1 = (7 * n1) % 64;
-        m2 = (7 * m2) % 64;
-        n2 = (7 * n2) % 64;
-        j += 1;
-    }
-    params
-};
-
 /// `bash-s` transformation.
 ///
 /// Implements the S-box transformation defined in Section 6.1 of STB 34.101.77-2020.
@@ -90,7 +70,7 @@ fn bash_s(
 ///
 /// # Parameters
 ///
-/// - `state`: Mutable reference to 24 × 64-bit words (1536 bits total) in little-endian internal representation
+/// - `state`: Mutable reference to 24 × 64-bit words (1536 bits total)
 pub fn bash_f(state: &mut [u64; STATE_WORDS]) {
     // 1. Split S into words (S0, S1, ..., S23)
 
@@ -101,15 +81,18 @@ pub fn bash_f(state: &mut [u64; STATE_WORDS]) {
     for _ in 0..STATE_WORDS {
         // 3.1. Apply S-box layer with varying rotation parameters
         // (m1, n1, m2, n2) ← (8, 53, 14, 1)
+        let (mut m1, mut n1, mut m2, mut n2) = (8, 53, 14, 1);
+
         // 3.2. For j = 0, 1, ..., 7 apply bash-s to each of 8 columns
         for j in 0..8 {
             // 3.2.a. (Sj, S8+j, S16+j) ← bash-s(Sj, S8+j, S16+j, m1, n1, m2, n2)
-            // 3.2.b. (m1, n1, m2, n2) ← (7·m1 mod 64, 7·n1 mod 64, 7·m2 mod 64, 7·n2 mod 64)
-            let (m1, n1, m2, n2) = ROTATION_PARAMS[j];
             let (s0, s1, s2) = bash_s(state[j], state[8 + j], state[16 + j], m1, n1, m2, n2);
             state[j] = s0;
             state[8 + j] = s1;
             state[16 + j] = s2;
+
+            // 3.2.b. (m1, n1, m2, n2) ← (7·m1 mod 64, 7·n1 mod 64, 7·m2 mod 64, 7·n2 mod 64)
+            (m1, n1, m2, n2) = ((7 * m1) % 64, (7 * n1) % 64, (7 * m2) % 64, (7 * n2) % 64);
         }
 
         // 3.3. Apply word permutation