1  // Copyright (c) 2019-2025 Alpha-Delta Network Inc.
 2  // This file is part of the alphavm library.
 3  
 4  // Licensed under the Apache License, Version 2.0 (the "License");
 5  // you may not use this file except in compliance with the License.
 6  // You may obtain a copy of the License at:
 7  
 8  // http://www.apache.org/licenses/LICENSE-2.0
 9  
10  // Unless required by applicable law or agreed to in writing, software
11  // distributed under the License is distributed on an "AS IS" BASIS,
12  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  // See the License for the specific language governing permissions and
14  // limitations under the License.
15  
16  use super::*;
17  
18  impl<E: Environment, const NUM_WINDOWS: u8, const WINDOW_SIZE: u8> Commit for BHP<E, NUM_WINDOWS, WINDOW_SIZE> {
19      type Input = Boolean<E>;
20      type Output = Field<E>;
21      type Randomizer = Scalar<E>;
22  
23      /// Returns the BHP commitment of the given input and randomizer as a field element.
24      fn commit(&self, input: &[Self::Input], randomizer: &Self::Randomizer) -> Self::Output {
25          self.commit_uncompressed(input, randomizer).to_x_coordinate()
26      }
27  }
28  
29  #[cfg(test)]
30  mod tests {
31      use super::*;
32      use alphavm_circuit_types::environment::Circuit;
33      use alphavm_utilities::{TestRng, Uniform};
34  
35      use anyhow::Result;
36  
37      const ITERATIONS: u64 = 100;
38      const DOMAIN: &str = "BHPCircuit0";
39  
40      fn check_commit<const NUM_WINDOWS: u8, const WINDOW_SIZE: u8>(
41          mode: Mode,
42          num_constants: u64,
43          num_public: u64,
44          num_private: u64,
45          num_constraints: u64,
46      ) -> Result<()> {
47          use console::Commit as C;
48  
49          // Initialize BHP.
50          let native = console::BHP::<<Circuit as Environment>::Network, NUM_WINDOWS, WINDOW_SIZE>::setup(DOMAIN)?;
51          let circuit = BHP::<Circuit, NUM_WINDOWS, WINDOW_SIZE>::new(Mode::Constant, native.clone());
52          // Determine the number of inputs.
53          let num_input_bits = NUM_WINDOWS as usize * WINDOW_SIZE as usize * BHP_CHUNK_SIZE;
54  
55          let mut rng = TestRng::default();
56  
57          for i in 0..ITERATIONS {
58              // Sample a random input.
59              let input = (0..num_input_bits).map(|_| bool::rand(&mut rng)).collect::<Vec<bool>>();
60              // Sample a randomizer.
61              let randomizer = Uniform::rand(&mut rng);
62              // Compute the expected commitment.
63              let expected = native.commit(&input, &randomizer).expect("Failed to commit native input");
64              // Prepare the circuit input.
65              let circuit_input: Vec<Boolean<_>> = Inject::new(mode, input);
66              // Prepare the circuit randomizer.
67              let circuit_randomizer: Scalar<_> = Inject::new(mode, randomizer);
68  
69              Circuit::scope(format!("BHP {mode} {i}"), || {
70                  // Perform the hash operation.
71                  let candidate = circuit.commit(&circuit_input, &circuit_randomizer);
72                  assert_scope!(<=num_constants, num_public, num_private, num_constraints);
73                  assert_eq!(expected, candidate.eject_value());
74              });
75              Circuit::reset();
76          }
77          Ok(())
78      }
79  
80      #[test]
81      fn test_commit_constant() -> Result<()> {
82          check_commit::<32, 48>(Mode::Constant, 8250, 0, 0, 0)
83      }
84  
85      #[test]
86      fn test_commit_public() -> Result<()> {
87          check_commit::<32, 48>(Mode::Public, 1044, 0, 10781, 10785)
88      }
89  
90      #[test]
91      fn test_commit_private() -> Result<()> {
92          check_commit::<32, 48>(Mode::Private, 1044, 0, 10781, 10785)
93      }
94  }