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Fix encryption and decryption generalization with unlimited max messa… #7

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2 changes: 1 addition & 1 deletion benches/pose_enc.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -72,7 +72,7 @@ fn bench_poseidon<const T: usize, const RATE: usize, const K: u32>(name: &str, c
let mut ref_pos_enc =
PoseidonCipher::<Fr, FULL_ROUND, PARTIAL_ROUND, T, RATE>::new([key.key0, key.key1]);

let ref_cipher = ref_pos_enc.encrypt(&inputs, &Fr::ONE);
let ref_cipher = ref_pos_enc.encrypt(&inputs, &Fr::ONE).unwrap();

print!("\nmsg length: {:?}\n", MESSAGE_CAPACITY);

Expand Down
2 changes: 1 addition & 1 deletion src/encryption/chip.rs
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Expand Up @@ -221,7 +221,7 @@ fn test_pos_enc() {

//== Poseidon Encryption ==//

let ref_cipher = ref_pos_enc.encrypt(&inputs, &F::ONE);
let ref_cipher = ref_pos_enc.encrypt(&inputs, &F::ONE).unwrap();

//== Circuit ==//

Expand Down
102 changes: 68 additions & 34 deletions src/encryption/poseidon_enc.rs
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Original file line number Diff line number Diff line change
@@ -1,13 +1,14 @@
use ff::{Field, FromUniformBytes, PrimeField};
use halo2wrong::curves::bn256;
use poseidon::Poseidon;
use rand_core::Error;

use crate::poseidon::{
self,
chip::{FULL_ROUND, PARTIAL_ROUND},
};

pub const MESSAGE_CAPACITY: usize = 2; //max 31
pub const MESSAGE_CAPACITY: usize = 33;
pub const CIPHER_SIZE: usize = MESSAGE_CAPACITY + 1;

#[derive(Copy, Clone, Debug, Default)]
Expand All @@ -32,7 +33,7 @@ impl<F: PrimeField> PoseidonEncKey<F> {
}
}

#[derive(Debug, Clone, Copy, Default)]
#[derive(Debug, Clone, Copy)]
pub struct PoseidonCipher<
F: PrimeField + FromUniformBytes<64>,
const r_f: usize,
Expand All @@ -46,6 +47,20 @@ pub struct PoseidonCipher<
pub cipher: [F; CIPHER_SIZE],
}

impl<F, const r_f: usize, const r_p: usize, const T: usize, const RATE: usize> Default
for PoseidonCipher<F, r_f, r_p, T, RATE>
where
F: PrimeField + FromUniformBytes<64> + Default,
{
fn default() -> Self {
PoseidonCipher {
cipherKey: [F::default(); 2],
cipherByteSize: Default::default(),
cipher: [F::default(); CIPHER_SIZE], // CIPHER_SIZE에 따라
}
}
}

impl<F, const r_f: usize, const r_p: usize, const T: usize, const RATE: usize>
PoseidonCipher<F, r_f, r_p, T, RATE>
where
Expand Down Expand Up @@ -83,7 +98,7 @@ where
]
}

pub fn encrypt(&mut self, message: &[F], nonce: &F) -> [F; CIPHER_SIZE] {
pub fn encrypt(&mut self, message: &[F], nonce: &F) -> Result<[F; CIPHER_SIZE], Error> {
let mut encrypter = Poseidon::<F, T, RATE>::new_enc(
FULL_ROUND,
PARTIAL_ROUND,
Expand Down Expand Up @@ -111,67 +126,86 @@ where
.skip(1)
.zip(inputs.iter())
{
*word = word.add(input);
*word = word.add(input); // c = s + m, m = c - s
if i < MESSAGE_CAPACITY {
// c_n = p(s+m) + m_n
cipher[i] = word.clone();
i += 1;
}
}
if inputs.len() == RATE {
encrypter.update(&inputs);
} else {

encrypter.update(&inputs);
if inputs.len() < RATE {
encrypter.squeeze(0);
}
}
// encrypter.perm_with_input(&[]);

cipher[MESSAGE_CAPACITY] = encrypter.state.words()[1].clone();

// println!("enc_cipher[MESSAGE_CAPACITY]:{:?}", cipher[MESSAGE_CAPACITY]);

self.cipher = cipher;

cipher
Ok(cipher)
}

pub fn decrypt(&mut self, nonce: &F) -> Option<[F; MESSAGE_CAPACITY]> {
let mut encrypter = Poseidon::<F, T, RATE>::new_enc(
pub fn decrypt(
&mut self,
cipher: &[F; CIPHER_SIZE],
nonce: &F,
) -> Result<[F; MESSAGE_CAPACITY], Error> {
let mut decrypter = Poseidon::<F, T, RATE>::new_enc(
FULL_ROUND,
PARTIAL_ROUND,
self.cipherKey[0],
self.cipherKey[1],
);

let mut message = [F::ZERO; MESSAGE_CAPACITY];
decrypter.update(&vec![]);
decrypter.squeeze(0);

encrypter.update(&vec![]);
encrypter.squeeze(0);

let mut state_2 = encrypter.state.words().clone();

(0..MESSAGE_CAPACITY).for_each(|i| {
message[i] = self.cipher[i] - state_2[(i + 1) % T];
state_2[(i + 1) % T] = self.cipher[i];
});

encrypter.update(&mut message);
encrypter.squeeze(0);
let mut message = [F::ZERO; MESSAGE_CAPACITY];
let mut i = 0;

let state_3 = encrypter.state.words().clone();
let parity = cipher[MESSAGE_CAPACITY];

if self.cipher[MESSAGE_CAPACITY] != state_3[1] {
return None;
for chunk in cipher[..MESSAGE_CAPACITY].chunks(RATE) {
for (word, encrypted_word) in
decrypter.state.words().iter_mut().skip(1).zip(chunk.iter())
{
if i < MESSAGE_CAPACITY {
message[i] = encrypted_word.sub(word.clone());
i += 1;
}
}
// println!(">>1. state:{:?}", decrypter.state.words());
let offset = i % RATE;
if offset == 0 {
decrypter.update(&message[i - RATE..i]);
} else {
// if chunk.len() < RATE {
decrypter.update(&message[i - offset..i]);
decrypter.squeeze(0);
// }
}
}
if parity != decrypter.state.words()[1] {
return Err(Error::new("Invalid cipher text"));
}
Some(message)
// println!(">>2. state:{:?}", decrypter.state.words());
Ok(message)
}
}

#[test]
fn test_encryption() {
let mut cipher = PoseidonCipher::<bn256::Fr, 8, 57, 5, 4>::new([bn256::Fr::ZERO; 2]);
let message = [bn256::Fr::ZERO; MESSAGE_CAPACITY];
let message = [bn256::Fr::ONE; MESSAGE_CAPACITY];

println!("message: {:?}", message);

let cipherText = cipher.encrypt(&message, &bn256::Fr::ONE);
println!("encrypted: {:?}", cipherText);
println!("decrypted: {:?}", cipher.decrypt(&bn256::Fr::ONE));
let cipher_text = cipher.encrypt(&message, &bn256::Fr::ONE).unwrap();
println!("encrypted: {:?}", cipher_text);
println!(
"decrypted: {:?}",
cipher.decrypt(&cipher_text, &bn256::Fr::ONE).unwrap()
);
}
2 changes: 1 addition & 1 deletion src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -270,7 +270,7 @@ impl<F: PrimeField + FromUniformBytes<64>, const T: usize, const RATE: usize> Ci
// // == Encryption Scheme == //
let mut ref_enc =
PoseidonCipher::<F, FULL_ROUND, PARTIAL_ROUND, T, RATE>::new(pose_key);
let encryption_result = ref_enc.encrypt(&self.message, &F::ONE);
let encryption_result = ref_enc.encrypt(&self.message, &F::ONE).unwrap();
let mut expected_result = vec![];
// assign expected result
for result in &encryption_result {
Expand Down