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feat: add order signature verification (#203)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| use anyhow::{anyhow, Result}; | ||
| use lazy_static::lazy_static; | ||
| use rust_decimal::prelude::ToPrimitive; | ||
| use std::convert::TryInto; | ||
| use std::str::FromStr; | ||
|
|
||
| pub use babyjubjub_rs::{Point, Signature}; | ||
| pub use ff::{from_hex, to_hex}; | ||
| pub use ff::{Field, PrimeField, PrimeFieldRepr}; | ||
| pub use num_bigint::BigInt; | ||
| pub use poseidon_rs::Fr; | ||
| pub use rust_decimal::Decimal; | ||
|
|
||
| lazy_static! { | ||
| //pub static ref POSEIDON_PARAMS: poseidon_rs::Constants = poseidon_rs::load_constants(); | ||
| pub static ref POSEIDON_HASHER: poseidon_rs::Poseidon = poseidon_rs::Poseidon::new(); | ||
| } | ||
|
|
||
| pub fn hash(inputs: &[Fr]) -> Fr { | ||
| (&POSEIDON_HASHER).hash(inputs.to_vec()).unwrap() | ||
| } | ||
|
|
||
| // TODO: these functions needed to be rewrite... | ||
|
|
||
| pub fn u32_to_fr(x: u32) -> Fr { | ||
| Fr::from_str(&format!("{}", x)).unwrap() | ||
| } | ||
|
|
||
| pub fn u64_to_fr(x: u64) -> Fr { | ||
| Fr::from_repr(poseidon_rs::FrRepr::from(x)).unwrap() | ||
| } | ||
|
|
||
| pub fn bigint_to_fr(x: BigInt) -> Fr { | ||
| let mut s = x.to_str_radix(16); | ||
| if s.len() % 2 != 0 { | ||
| // convert "f" to "0f" | ||
| s.insert(0, '0'); | ||
| } | ||
| from_hex(&s).unwrap() | ||
| } | ||
|
|
||
| pub fn str_to_fr(x: &str) -> Fr { | ||
| if x.starts_with("0x") { | ||
| vec_to_fr(&hex::decode(x.trim_start_matches("0x")).unwrap()).unwrap() | ||
| } else { | ||
| let i = BigInt::from_str(x).unwrap(); | ||
| bigint_to_fr(i) | ||
| } | ||
| } | ||
|
|
||
| pub fn vec_to_fr(arr: &[u8]) -> Result<Fr> { | ||
| if arr.len() > 32 { | ||
| anyhow::bail!("invalid vec len for fr"); | ||
| } | ||
| let mut repr = <Fr as PrimeField>::Repr::default(); | ||
|
|
||
| // prepad 0 | ||
| let mut buf = arr.to_vec(); | ||
| let required_length = repr.as_ref().len() * 8; | ||
| buf.reverse(); | ||
| buf.resize(required_length, 0); | ||
| buf.reverse(); | ||
|
|
||
| repr.read_be(&buf[..])?; | ||
| Ok(Fr::from_repr(repr)?) | ||
| } | ||
|
|
||
| pub fn fr_to_u32(f: &Fr) -> u32 { | ||
| fr_to_string(f).parse::<u32>().unwrap() | ||
| } | ||
|
|
||
| pub fn fr_to_i64(f: &Fr) -> i64 { | ||
| fr_to_string(f).parse::<i64>().unwrap() | ||
| } | ||
|
|
||
| pub fn fr_to_bigint(elem: &Fr) -> BigInt { | ||
| BigInt::parse_bytes(to_hex(elem).as_bytes(), 16).unwrap() | ||
| } | ||
|
|
||
| pub fn fr_to_string(elem: &Fr) -> String { | ||
| fr_to_bigint(&elem).to_str_radix(10) | ||
| } | ||
|
|
||
| pub fn fr_to_decimal(f: &Fr, scale: u32) -> Decimal { | ||
| Decimal::new(fr_to_i64(f), scale) | ||
| } | ||
|
|
||
| // big endian | ||
| pub fn fr_to_vec(f: &Fr) -> Vec<u8> { | ||
| let repr = f.into_repr(); | ||
| let required_length = repr.as_ref().len() * 8; | ||
| let mut buf: Vec<u8> = Vec::with_capacity(required_length); | ||
| repr.write_be(&mut buf).unwrap(); | ||
| buf | ||
| } | ||
|
|
||
| pub fn fr_to_bool(f: &Fr) -> Result<bool> { | ||
| if f.is_zero() { | ||
| Ok(false) | ||
| } else if f == &Fr::one() { | ||
| Ok(true) | ||
| } else { | ||
| Err(anyhow!("invalid fr")) | ||
| } | ||
| } | ||
|
|
||
| pub fn str_to_pubkey(pubkey: &str) -> Result<Point> { | ||
| let pubkey_packed = hex::decode(pubkey)?; | ||
| babyjubjub_rs::decompress_point(pubkey_packed.try_into().unwrap()).map_err(|e| anyhow!(e)) | ||
| } | ||
|
|
||
| pub fn str_to_signature(signature: &str) -> Result<Signature> { | ||
| let sig_packed_vec = hex::decode(signature)?; | ||
| babyjubjub_rs::decompress_signature(&sig_packed_vec.try_into().unwrap()).map_err(|e| anyhow!(e)) | ||
| } | ||
|
|
||
| pub fn decimal_to_u64(num: &Decimal, prec: u32) -> u64 { | ||
| let prec_mul = Decimal::new(10, 0).powi(prec as u64); | ||
| let adjusted = num * prec_mul; | ||
| adjusted.floor().to_u64().unwrap() | ||
| } | ||
|
|
||
| pub fn decimal_to_fr(num: &Decimal, prec: u32) -> Fr { | ||
| // TODO: is u64 enough? | ||
| u64_to_fr(decimal_to_u64(num, prec)) | ||
| // Float864::from_decimal(num, prec).unwrap().to_fr() | ||
| } |