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circom-compat
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zkey: expose only 1 method - everything else private

This commit is contained in:
Georgios Konstantopoulos 2021-07-26 17:38:29 +03:00
parent 8ff7f3cd1b
commit 29a7555c08
1 changed files with 59 additions and 100 deletions
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159
src/zkey.rs
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@ -1,4 +1,4 @@
//! ZKey //! ZKey Parsing
//! //!
//! Each ZKey file is broken into sections: //! Each ZKey file is broken into sections:
//! Header(1) //! Header(1)
@ -32,30 +32,35 @@ use byteorder::{LittleEndian, ReadBytesExt};
use std::{ use std::{
collections::HashMap, collections::HashMap,
io::{Cursor, Read, Result as IoResult}, io::{Read, Result as IoResult, Seek, SeekFrom},
}; };
use ark_bn254::{Bn254, Fq, Fq2, G1Affine, G2Affine}; use ark_bn254::{Bn254, Fq, Fq2, G1Affine, G2Affine};
use ark_groth16::{ProvingKey, VerifyingKey}; use ark_groth16::{ProvingKey, VerifyingKey};
use ark_serialize::CanonicalSerialize;
use num_traits::Zero; use num_traits::Zero;
#[derive(Clone, Debug)] #[derive(Clone, Debug)]
pub struct Section { struct Section {
position: u64, position: u64,
size: usize, size: usize,
} }
/// Reads a SnarkJS ZKey file into an Arkworks ProvingKey.
pub fn read_zkey<R: Read + Seek>(reader: &mut R) -> IoResult<ProvingKey<Bn254>> {
let mut binfile = BinFile::new(reader)?;
binfile.proving_key()
}
#[derive(Debug)] #[derive(Debug)]
pub struct BinFile<'a> { struct BinFile<'a, R> {
ftype: String, ftype: String,
version: u32, version: u32,
sections: HashMap<u32, Vec<Section>>, sections: HashMap<u32, Vec<Section>>,
reader: &'a mut Cursor<&'a [u8]>, reader: &'a mut R,
} }
impl<'a> BinFile<'a> { impl<'a, R: Read + Seek> BinFile<'a, R> {
pub fn new(reader: &'a mut Cursor<&'a [u8]>) -> IoResult<Self> { fn new(reader: &'a mut R) -> IoResult<Self> {
let mut magic = [0u8; 4]; let mut magic = [0u8; 4];
reader.read_exact(&mut magic)?; reader.read_exact(&mut magic)?;
@ -70,11 +75,11 @@ impl<'a> BinFile<'a> {
let section = sections.entry(section_id).or_insert_with(Vec::new); let section = sections.entry(section_id).or_insert_with(Vec::new);
section.push(Section { section.push(Section {
position: reader.position(), position: reader.stream_position()?,
size: section_length as usize, size: section_length as usize,
}); });
reader.set_position(reader.position() + section_length); reader.seek(SeekFrom::Current(section_length as i64))?;
} }
Ok(Self { Ok(Self {
@ -85,7 +90,7 @@ impl<'a> BinFile<'a> {
}) })
} }
pub fn proving_key(&mut self) -> IoResult<ProvingKey<Bn254>> { fn proving_key(&mut self) -> IoResult<ProvingKey<Bn254>> {
let header = self.groth_header()?; let header = self.groth_header()?;
let ic = self.ic(header.n_public)?; let ic = self.ic(header.n_public)?;
@ -121,64 +126,60 @@ impl<'a> BinFile<'a> {
self.sections.get(&id).unwrap()[0].clone() self.sections.get(&id).unwrap()[0].clone()
} }
pub fn groth_header(&mut self) -> IoResult<HeaderGroth> { fn groth_header(&mut self) -> IoResult<HeaderGroth> {
let section = self.get_section(2); let section = self.get_section(2);
let header = HeaderGroth::new(&mut self.reader, &section)?; let header = HeaderGroth::new(&mut self.reader, &section)?;
Ok(header) Ok(header)
} }
pub fn ic(&mut self, n_public: usize) -> IoResult<Vec<G1Affine>> { fn ic(&mut self, n_public: usize) -> IoResult<Vec<G1Affine>> {
// the range is non-inclusive so we do +1 to get all inputs // the range is non-inclusive so we do +1 to get all inputs
self.g1_section(n_public + 1, 3) self.g1_section(n_public + 1, 3)
} }
// Section 4 is the coefficients, we ignore it // Section 4 is the coefficients, we ignore it
pub fn a_query(&mut self, n_vars: usize) -> IoResult<Vec<G1Affine>> { fn a_query(&mut self, n_vars: usize) -> IoResult<Vec<G1Affine>> {
self.g1_section(n_vars, 5) self.g1_section(n_vars, 5)
} }
pub fn b_g1_query(&mut self, n_vars: usize) -> IoResult<Vec<G1Affine>> { fn b_g1_query(&mut self, n_vars: usize) -> IoResult<Vec<G1Affine>> {
self.g1_section(n_vars, 6) self.g1_section(n_vars, 6)
} }
pub fn b_g2_query(&mut self, n_vars: usize) -> IoResult<Vec<G2Affine>> { fn b_g2_query(&mut self, n_vars: usize) -> IoResult<Vec<G2Affine>> {
self.g2_section(n_vars, 7) self.g2_section(n_vars, 7)
} }
pub fn l_query(&mut self, n_vars: usize) -> IoResult<Vec<G1Affine>> { fn l_query(&mut self, n_vars: usize) -> IoResult<Vec<G1Affine>> {
self.g1_section(n_vars, 8) self.g1_section(n_vars, 8)
} }
pub fn h_query(&mut self, n_vars: usize) -> IoResult<Vec<G1Affine>> { fn h_query(&mut self, n_vars: usize) -> IoResult<Vec<G1Affine>> {
self.g1_section(n_vars, 9) self.g1_section(n_vars, 9)
} }
fn g1_section(&mut self, num: usize, section_id: usize) -> IoResult<Vec<G1Affine>> { fn g1_section(&mut self, num: usize, section_id: usize) -> IoResult<Vec<G1Affine>> {
let section = self.get_section(section_id as u32); let section = self.get_section(section_id as u32);
deserialize_g1_vec( self.reader.seek(SeekFrom::Start(section.position))?;
&self.reader.get_ref()[section.position as usize..], deserialize_g1_vec(self.reader, num as u32)
num as u32,
)
} }
fn g2_section(&mut self, num: usize, section_id: usize) -> IoResult<Vec<G2Affine>> { fn g2_section(&mut self, num: usize, section_id: usize) -> IoResult<Vec<G2Affine>> {
let section = self.get_section(section_id as u32); let section = self.get_section(section_id as u32);
deserialize_g2_vec( self.reader.seek(SeekFrom::Start(section.position))?;
&self.reader.get_ref()[section.position as usize..], deserialize_g2_vec(self.reader, num as u32)
num as u32,
)
} }
} }
#[derive(Default, Clone, Debug, CanonicalDeserialize)] #[derive(Default, Clone, Debug, CanonicalDeserialize)]
pub struct ZVerifyingKey { pub struct ZVerifyingKey {
pub alpha_g1: G1Affine, alpha_g1: G1Affine,
pub beta_g1: G1Affine, beta_g1: G1Affine,
pub beta_g2: G2Affine, beta_g2: G2Affine,
pub gamma_g2: G2Affine, gamma_g2: G2Affine,
pub delta_g1: G1Affine, delta_g1: G1Affine,
pub delta_g2: G2Affine, delta_g2: G2Affine,
} }
impl ZVerifyingKey { impl ZVerifyingKey {
@ -202,25 +203,25 @@ impl ZVerifyingKey {
} }
#[derive(Clone, Debug)] #[derive(Clone, Debug)]
pub struct HeaderGroth { struct HeaderGroth {
pub n8q: u32, n8q: u32,
pub q: BigInteger256, q: BigInteger256,
pub n8r: u32, n8r: u32,
pub r: BigInteger256, r: BigInteger256,
pub n_vars: usize, n_vars: usize,
pub n_public: usize, n_public: usize,
pub domain_size: u32, domain_size: u32,
pub power: u32, power: u32,
pub verifying_key: ZVerifyingKey, verifying_key: ZVerifyingKey,
} }
impl HeaderGroth { impl HeaderGroth {
pub fn new(reader: &mut Cursor<&[u8]>, section: &Section) -> IoResult<Self> { fn new<R: Read + Seek>(reader: &mut R, section: &Section) -> IoResult<Self> {
reader.set_position(section.position); reader.seek(SeekFrom::Start(section.position))?;
Self::read(reader) Self::read(reader)
} }
@ -282,31 +283,18 @@ fn deserialize_g2<R: Read>(reader: &mut R) -> IoResult<G2Affine> {
Ok(G2Affine::new(f1, f2, infinity)) Ok(G2Affine::new(f1, f2, infinity))
} }
fn deserialize_g1_vec(buf: &[u8], n_vars: u32) -> IoResult<Vec<G1Affine>> { fn deserialize_g1_vec<R: Read>(reader: &mut R, n_vars: u32) -> IoResult<Vec<G1Affine>> {
let size = G1Affine::zero().uncompressed_size(); (0..n_vars).map(|_| deserialize_g1(reader)).collect()
let mut v = vec![];
for i in 0..n_vars as usize {
let el = deserialize_g1(&mut &buf[i * size..(i + 1) * size])?;
v.push(el);
}
Ok(v)
} }
fn deserialize_g2_vec(buf: &[u8], n_vars: u32) -> IoResult<Vec<G2Affine>> { fn deserialize_g2_vec<R: Read>(reader: &mut R, n_vars: u32) -> IoResult<Vec<G2Affine>> {
let size = G2Affine::zero().uncompressed_size(); (0..n_vars).map(|_| deserialize_g2(reader)).collect()
let mut v = vec![];
for i in 0..n_vars as usize {
let el = deserialize_g2(&mut &buf[i * size..(i + 1) * size])?;
v.push(el);
}
Ok(v)
} }
#[cfg(test)] #[cfg(test)]
mod tests { mod tests {
use super::*; use super::*;
use ark_bn254::{G1Projective, G2Projective}; use ark_bn254::{G1Projective, G2Projective};
use memmap::*;
use num_bigint::BigUint; use num_bigint::BigUint;
use serde_json::Value; use serde_json::Value;
use std::fs::File; use std::fs::File;
@ -420,7 +408,7 @@ mod tests {
.collect::<Vec<_>>(); .collect::<Vec<_>>();
let expected = vec![g1_one(); n_vars]; let expected = vec![g1_one(); n_vars];
let de = deserialize_g1_vec(&buf[..], n_vars as u32).unwrap(); let de = deserialize_g1_vec(&mut &buf[..], n_vars as u32).unwrap();
assert_eq!(expected, de); assert_eq!(expected, de);
} }
@ -444,7 +432,7 @@ mod tests {
.collect::<Vec<_>>(); .collect::<Vec<_>>();
let expected = vec![g2_one(); n_vars]; let expected = vec![g2_one(); n_vars];
let de = deserialize_g2_vec(&buf[..], n_vars as u32).unwrap(); let de = deserialize_g2_vec(&mut &buf[..], n_vars as u32).unwrap();
assert_eq!(expected, de); assert_eq!(expected, de);
} }
@ -465,14 +453,8 @@ mod tests {
// Then: // Then:
// `snarkjs zkey new circuit.r1cs powersOfTau28_hez_final_10.ptau test.zkey` // `snarkjs zkey new circuit.r1cs powersOfTau28_hez_final_10.ptau test.zkey`
let path = "./test-vectors/test.zkey"; let path = "./test-vectors/test.zkey";
let file = File::open(path).unwrap(); let mut file = File::open(path).unwrap();
let map = unsafe { let mut binfile = BinFile::new(&mut file).unwrap();
MmapOptions::new()
.map(&file)
.expect("unable to create a memory map")
};
let mut reader = Cursor::new(map.as_ref());
let mut binfile = BinFile::new(&mut reader).unwrap();
let header = binfile.groth_header().unwrap(); let header = binfile.groth_header().unwrap();
assert_eq!(header.n_vars, 4); assert_eq!(header.n_vars, 4);
assert_eq!(header.n_public, 1); assert_eq!(header.n_public, 1);
@ -483,15 +465,8 @@ mod tests {
#[test] #[test]
fn deser_key() { fn deser_key() {
let path = "./test-vectors/test.zkey"; let path = "./test-vectors/test.zkey";
let file = File::open(path).unwrap(); let mut file = File::open(path).unwrap();
let map = unsafe { let params = read_zkey(&mut file).unwrap();
MmapOptions::new()
.map(&file)
.expect("unable to create a memory map")
};
let mut reader = Cursor::new(map.as_ref());
let mut binfile = BinFile::new(&mut reader).unwrap();
let params = binfile.proving_key().unwrap();
// Check IC // Check IC
let expected = vec![ let expected = vec![
@ -710,16 +685,8 @@ mod tests {
#[test] #[test]
fn deser_vk() { fn deser_vk() {
let path = "./test-vectors/test.zkey"; let path = "./test-vectors/test.zkey";
let file = File::open(path).unwrap(); let mut file = File::open(path).unwrap();
let map = unsafe { let params = read_zkey(&mut file).unwrap();
MmapOptions::new()
.map(&file)
.expect("unable to create a memory map")
};
let mut reader = Cursor::new(map.as_ref());
let mut binfile = BinFile::new(&mut reader).unwrap();
let params = binfile.proving_key().unwrap();
let json = std::fs::read_to_string("./test-vectors/verification_key.json").unwrap(); let json = std::fs::read_to_string("./test-vectors/verification_key.json").unwrap();
let json: Value = serde_json::from_str(&json).unwrap(); let json: Value = serde_json::from_str(&json).unwrap();
@ -799,16 +766,8 @@ mod tests {
#[test] #[test]
fn verify_proof_with_zkey() { fn verify_proof_with_zkey() {
let path = "./test-vectors/test.zkey"; let path = "./test-vectors/test.zkey";
let file = File::open(path).unwrap(); let mut file = File::open(path).unwrap();
let map = unsafe { let params = read_zkey(&mut file).unwrap(); // binfile.proving_key().unwrap();
MmapOptions::new()
.map(&file)
.expect("unable to create a memory map")
};
let mut reader = Cursor::new(map.as_ref());
let mut binfile = BinFile::new(&mut reader).unwrap();
let params = binfile.proving_key().unwrap();
let cfg = CircuitConfig::<Bn254>::new( let cfg = CircuitConfig::<Bn254>::new(
"./test-vectors/mycircuit.wasm", "./test-vectors/mycircuit.wasm",