snarkvm_console_program/data/ciphertext/
parse.rs

1// Copyright 2024 Aleo Network Foundation
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
18static CIPHERTEXT_PREFIX: &str = "ciphertext";
19
20impl<N: Network> Parser for Ciphertext<N> {
21    /// Parses a string into an ciphertext.
22    #[inline]
23    fn parse(string: &str) -> ParserResult<Self> {
24        // Prepare a parser for the Aleo ciphertext.
25        let parse_ciphertext = recognize(pair(
26            pair(tag(CIPHERTEXT_PREFIX), tag("1")),
27            many1(terminated(one_of("qpzry9x8gf2tvdw0s3jn54khce6mua7l"), many0(char('_')))),
28        ));
29
30        // Parse the ciphertext from the string.
31        map_res(parse_ciphertext, |ciphertext: &str| -> Result<_, Error> {
32            Self::from_str(&ciphertext.replace('_', ""))
33        })(string)
34    }
35}
36
37impl<N: Network> FromStr for Ciphertext<N> {
38    type Err = Error;
39
40    /// Reads in the ciphertext string.
41    fn from_str(ciphertext: &str) -> Result<Self, Self::Err> {
42        // Decode the ciphertext string from bech32m.
43        let (hrp, data, variant) = bech32::decode(ciphertext)?;
44        if hrp != CIPHERTEXT_PREFIX {
45            bail!("Failed to decode ciphertext: '{hrp}' is an invalid prefix")
46        } else if data.is_empty() {
47            bail!("Failed to decode ciphertext: data field is empty")
48        } else if variant != bech32::Variant::Bech32m {
49            bail!("Found an ciphertext that is not bech32m encoded: {ciphertext}");
50        }
51        // Decode the ciphertext data from u5 to u8, and into the ciphertext.
52        Ok(Self::read_le(&Vec::from_base32(&data)?[..])?)
53    }
54}
55
56impl<N: Network> Debug for Ciphertext<N> {
57    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
58        Display::fmt(self, f)
59    }
60}
61
62impl<N: Network> Display for Ciphertext<N> {
63    /// Writes the ciphertext as a bech32m string.
64    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
65        // Convert the ciphertext to bytes.
66        let bytes = self.to_bytes_le().map_err(|_| fmt::Error)?;
67        // Encode the bytes into bech32m.
68        let string =
69            bech32::encode(CIPHERTEXT_PREFIX, bytes.to_base32(), bech32::Variant::Bech32m).map_err(|_| fmt::Error)?;
70        // Output the string.
71        Display::fmt(&string, f)
72    }
73}
74
75#[cfg(test)]
76mod tests {
77    use super::*;
78    use snarkvm_console_network::MainnetV0;
79
80    type CurrentNetwork = MainnetV0;
81
82    const ITERATIONS: u64 = 1_000;
83
84    #[test]
85    fn test_parse() -> Result<()> {
86        // Ensure type and empty value fails.
87        assert!(Ciphertext::<CurrentNetwork>::parse(&format!("{CIPHERTEXT_PREFIX}1")).is_err());
88        assert!(Ciphertext::<CurrentNetwork>::parse("").is_err());
89
90        let mut rng = TestRng::default();
91
92        for _ in 0..ITERATIONS {
93            // Sample a new ciphertext.
94            let ciphertext =
95                Ciphertext::<CurrentNetwork>((0..100).map(|_| Uniform::rand(&mut rng)).collect::<Vec<_>>());
96
97            let expected = format!("{ciphertext}");
98            let (remainder, candidate) = Ciphertext::<CurrentNetwork>::parse(&expected).unwrap();
99            assert_eq!(format!("{expected}"), candidate.to_string());
100            assert_eq!(CIPHERTEXT_PREFIX, candidate.to_string().split('1').next().unwrap());
101            assert_eq!("", remainder);
102        }
103        Ok(())
104    }
105
106    #[test]
107    fn test_string() -> Result<()> {
108        let mut rng = TestRng::default();
109
110        for _ in 0..ITERATIONS {
111            // Sample a new ciphertext.
112            let expected = Ciphertext::<CurrentNetwork>((0..100).map(|_| Uniform::rand(&mut rng)).collect::<Vec<_>>());
113
114            // Check the string representation.
115            let candidate = format!("{expected}");
116            assert_eq!(expected, Ciphertext::from_str(&candidate)?);
117            assert_eq!(CIPHERTEXT_PREFIX, candidate.split('1').next().unwrap());
118        }
119        Ok(())
120    }
121
122    #[test]
123    fn test_display() -> Result<()> {
124        let mut rng = TestRng::default();
125
126        for _ in 0..ITERATIONS {
127            // Sample a new ciphertext.
128            let expected = Ciphertext::<CurrentNetwork>((0..100).map(|_| Uniform::rand(&mut rng)).collect::<Vec<_>>());
129
130            let candidate = expected.to_string();
131            assert_eq!(format!("{expected}"), candidate);
132            assert_eq!(CIPHERTEXT_PREFIX, candidate.split('1').next().unwrap());
133
134            let candidate_recovered = Ciphertext::<CurrentNetwork>::from_str(&candidate.to_string())?;
135            assert_eq!(expected, candidate_recovered);
136        }
137        Ok(())
138    }
139}
snarkvm_console_program/data/ciphertext/parse.rs

snarkvm_console_program/data/ciphertext/
parse.rs
