1  // Copyright (c) 2025-2026 ACDC Network
  2  // This file is part of the alphavm library.
  3  //
  4  // Alpha Chain | Delta Chain Protocol
  5  // International Monetary Graphite.
  6  //
  7  // Derived from Aleo (https://aleo.org) and ProvableHQ (https://provable.com).
  8  // They built world-class ZK infrastructure. We installed the EASY button.
  9  // Their cryptography: elegant. Our modifications: bureaucracy-compatible.
 10  // Original brilliance: theirs. Robert's Rules: ours. Bugs: definitely ours.
 11  //
 12  // Original Aleo/ProvableHQ code subject to Apache 2.0 https://www.apache.org/licenses/LICENSE-2.0
 13  // All modifications and new work: CC0 1.0 Universal Public Domain Dedication.
 14  // No rights reserved. No permission required. No warranty. No refunds.
 15  //
 16  // https://creativecommons.org/publicdomain/zero/1.0/
 17  // SPDX-License-Identifier: CC0-1.0
 18  
 19  use super::*;
 20  
 21  static CIPHERTEXT_PREFIX: &str = "ciphertext";
 22  
 23  impl<N: Network> Parser for Ciphertext<N> {
 24      /// Parses a string into an ciphertext.
 25      #[inline]
 26      fn parse(string: &str) -> ParserResult<'_, Self> {
 27          // Prepare a parser for the Alpha ciphertext.
 28          let parse_ciphertext = recognize(pair(
 29              pair(tag(CIPHERTEXT_PREFIX), tag("1")),
 30              many1(terminated(one_of("qpzry9x8gf2tvdw0s3jn54khce6mua7l"), many0(char('_')))),
 31          ));
 32  
 33          // Parse the ciphertext from the string.
 34          map_res(parse_ciphertext, |ciphertext: &str| -> Result<_, Error> {
 35              Self::from_str(&ciphertext.replace('_', ""))
 36          })(string)
 37      }
 38  }
 39  
 40  impl<N: Network> FromStr for Ciphertext<N> {
 41      type Err = Error;
 42  
 43      /// Reads in the ciphertext string.
 44      fn from_str(ciphertext: &str) -> Result<Self, Self::Err> {
 45          // Decode the ciphertext string from bech32m.
 46          let (hrp, data, variant) = bech32::decode(ciphertext)?;
 47          if hrp != CIPHERTEXT_PREFIX {
 48              bail!("Failed to decode ciphertext: '{hrp}' is an invalid prefix")
 49          } else if data.is_empty() {
 50              bail!("Failed to decode ciphertext: data field is empty")
 51          } else if variant != bech32::Variant::Bech32m {
 52              bail!("Found an ciphertext that is not bech32m encoded: {ciphertext}");
 53          }
 54          // Decode the ciphertext data from u5 to u8, and into the ciphertext.
 55          Ok(Self::read_le(&Vec::from_base32(&data)?[..])?)
 56      }
 57  }
 58  
 59  impl<N: Network> Debug for Ciphertext<N> {
 60      fn fmt(&self, f: &mut Formatter) -> fmt::Result {
 61          Display::fmt(self, f)
 62      }
 63  }
 64  
 65  impl<N: Network> Display for Ciphertext<N> {
 66      /// Writes the ciphertext as a bech32m string.
 67      fn fmt(&self, f: &mut Formatter) -> fmt::Result {
 68          // Convert the ciphertext to bytes.
 69          let bytes = self.to_bytes_le().map_err(|_| fmt::Error)?;
 70          // Encode the bytes into bech32m.
 71          let string =
 72              bech32::encode(CIPHERTEXT_PREFIX, bytes.to_base32(), bech32::Variant::Bech32m).map_err(|_| fmt::Error)?;
 73          // Output the string.
 74          Display::fmt(&string, f)
 75      }
 76  }
 77  
 78  #[cfg(test)]
 79  mod tests {
 80      use super::*;
 81      use alphavm_console_network::MainnetV0;
 82  
 83      type CurrentNetwork = MainnetV0;
 84  
 85      const ITERATIONS: u64 = 1_000;
 86  
 87      #[test]
 88      fn test_parse() -> Result<()> {
 89          // Ensure type and empty value fails.
 90          assert!(Ciphertext::<CurrentNetwork>::parse(&format!("{CIPHERTEXT_PREFIX}1")).is_err());
 91          assert!(Ciphertext::<CurrentNetwork>::parse("").is_err());
 92  
 93          let mut rng = TestRng::default();
 94  
 95          for _ in 0..ITERATIONS {
 96              // Sample a new ciphertext.
 97              let ciphertext =
 98                  Ciphertext::<CurrentNetwork>((0..100).map(|_| Uniform::rand(&mut rng)).collect::<Vec<_>>());
 99  
100              let expected = format!("{ciphertext}");
101              let (remainder, candidate) = Ciphertext::<CurrentNetwork>::parse(&expected).unwrap();
102              assert_eq!(format!("{expected}"), candidate.to_string());
103              assert_eq!(CIPHERTEXT_PREFIX, candidate.to_string().split('1').next().unwrap());
104              assert_eq!("", remainder);
105          }
106          Ok(())
107      }
108  
109      #[test]
110      fn test_string() -> Result<()> {
111          let mut rng = TestRng::default();
112  
113          for _ in 0..ITERATIONS {
114              // Sample a new ciphertext.
115              let expected = Ciphertext::<CurrentNetwork>((0..100).map(|_| Uniform::rand(&mut rng)).collect::<Vec<_>>());
116  
117              // Check the string representation.
118              let candidate = format!("{expected}");
119              assert_eq!(expected, Ciphertext::from_str(&candidate)?);
120              assert_eq!(CIPHERTEXT_PREFIX, candidate.split('1').next().unwrap());
121          }
122          Ok(())
123      }
124  
125      #[test]
126      fn test_display() -> Result<()> {
127          let mut rng = TestRng::default();
128  
129          for _ in 0..ITERATIONS {
130              // Sample a new ciphertext.
131              let expected = Ciphertext::<CurrentNetwork>((0..100).map(|_| Uniform::rand(&mut rng)).collect::<Vec<_>>());
132  
133              let candidate = expected.to_string();
134              assert_eq!(format!("{expected}"), candidate);
135              assert_eq!(CIPHERTEXT_PREFIX, candidate.split('1').next().unwrap());
136  
137              let candidate_recovered = Ciphertext::<CurrentNetwork>::from_str(&candidate.to_string())?;
138              assert_eq!(expected, candidate_recovered);
139          }
140          Ok(())
141      }
142  }