snarkvm_console_program/data/ciphertext/
bytes.rs

1// Copyright (c) 2019-2025 Provable Inc.
2// This file is part of the snarkVM 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
16use super::*;
17
18impl<N: Network> FromBytes for Ciphertext<N> {
19    /// Reads the ciphertext from a buffer.
20    #[inline]
21    fn read_le<R: Read>(mut reader: R) -> IoResult<Self> {
22        // Read the number of field elements.
23        let num_fields = u16::read_le(&mut reader)?;
24        // Ensure the number of field elements does not exceed the maximum allowed size.
25        match num_fields as u32 <= N::MAX_DATA_SIZE_IN_FIELDS {
26            // Read the field elements.
27            true => {
28                Ok(Ciphertext((0..num_fields).map(|_| Field::read_le(&mut reader)).collect::<Result<Vec<_>, _>>()?))
29            }
30            false => Err(error("Ciphertext is too large to encode in field elements.")),
31        }
32    }
33}
34
35impl<N: Network> ToBytes for Ciphertext<N> {
36    /// Writes the ciphertext to a buffer.
37    #[inline]
38    fn write_le<W: Write>(&self, mut writer: W) -> IoResult<()> {
39        // Ensure the number of field elements does not exceed the maximum allowed size.
40        if u32::try_from(self.0.len()).or_halt::<N>() > N::MAX_DATA_SIZE_IN_FIELDS || self.0.len() > u16::MAX as usize {
41            return Err(error("Ciphertext is too large to encode in field elements."));
42        }
43        // Write the number of ciphertext field elements.
44        u16::try_from(self.0.len()).or_halt::<N>().write_le(&mut writer)?;
45        // Write the ciphertext field elements.
46        self.0.write_le(&mut writer)
47    }
48}
49
50#[cfg(test)]
51mod tests {
52    use super::*;
53    use snarkvm_console_network::MainnetV0;
54
55    type CurrentNetwork = MainnetV0;
56
57    const ITERATIONS: u32 = 1000;
58
59    #[test]
60    fn test_bytes() -> Result<()> {
61        let mut rng = TestRng::default();
62
63        for _ in 0..ITERATIONS {
64            // Sample a new ciphertext.
65            let expected = Ciphertext::<CurrentNetwork>((0..100).map(|_| Uniform::rand(&mut rng)).collect::<Vec<_>>());
66
67            // Check the byte representation.
68            let expected_bytes = expected.to_bytes_le()?;
69            assert_eq!(expected, Ciphertext::read_le(&expected_bytes[..])?);
70        }
71        Ok(())
72    }
73}
snarkvm_console_program/data/ciphertext/bytes.rs

snarkvm_console_program/data/ciphertext/
bytes.rs
