kilic
9 months ago
commit
d688e34d8e
9 changed files with 1074 additions and 0 deletions
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+2 -0.gitignore
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+143 -0src/eddsa.rs
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+55 -0src/lib.rs
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+19 -0src/poseidon.rs
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+56 -0src/signature.rs
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||||
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||||
|
"num-traits", |
||||
|
] |
||||
|
|
||||
|
[[package]] |
||||
|
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||||
|
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||||
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||||
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||||
|
"autocfg", |
||||
|
] |
||||
|
|
||||
|
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||||
|
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||||
|
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||||
|
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
|
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||||
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||||
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||||
|
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||||
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||||
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||||
|
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||||
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||||
|
[[package]] |
||||
|
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||||
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||||
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||||
|
"libc", |
||||
|
"rand_chacha", |
||||
|
"rand_core", |
||||
|
] |
||||
|
|
||||
|
[[package]] |
||||
|
name = "rand_chacha" |
||||
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||||
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||||
|
"ppv-lite86", |
||||
|
"rand_core", |
||||
|
] |
||||
|
|
||||
|
[[package]] |
||||
|
name = "rand_core" |
||||
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||||
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||||
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dependencies = [ |
||||
|
"getrandom", |
||||
|
] |
||||
|
|
||||
|
[[package]] |
||||
|
name = "rustc_version" |
||||
|
version = "0.4.0" |
||||
|
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||||
|
"semver", |
||||
|
] |
||||
|
|
||||
|
[[package]] |
||||
|
name = "ryu" |
||||
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||||
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|
||||
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[[package]] |
||||
|
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||||
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||||
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[[package]] |
||||
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||||
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||||
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||||
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||||
|
"serde_derive", |
||||
|
] |
||||
|
|
||||
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[[package]] |
||||
|
name = "serde_derive" |
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||||
|
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||||
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"quote", |
||||
|
"syn 2.0.66", |
||||
|
] |
||||
|
|
||||
|
[[package]] |
||||
|
name = "serde_json" |
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||||
|
"itoa", |
||||
|
"ryu", |
||||
|
"serde", |
||||
|
] |
||||
|
|
||||
|
[[package]] |
||||
|
name = "sha2" |
||||
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||||
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||||
|
"cfg-if", |
||||
|
"cpufeatures", |
||||
|
"digest", |
||||
|
] |
||||
|
|
||||
|
[[package]] |
||||
|
name = "subtle" |
||||
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||||
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||||
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||||
|
"quote", |
||||
|
"unicode-ident", |
||||
|
] |
||||
|
|
||||
|
[[package]] |
||||
|
name = "syn" |
||||
|
version = "2.0.66" |
||||
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||||
|
"proc-macro2", |
||||
|
"quote", |
||||
|
"unicode-ident", |
||||
|
] |
||||
|
|
||||
|
[[package]] |
||||
|
name = "tracing" |
||||
|
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||||
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||||
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||||
|
"pin-project-lite", |
||||
|
"tracing-core", |
||||
|
] |
||||
|
|
||||
|
[[package]] |
||||
|
name = "tracing-core" |
||||
|
version = "0.1.32" |
||||
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source = "registry+https://github.com/rust-lang/crates.io-index" |
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|
||||
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[[package]] |
||||
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|
||||
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[[package]] |
||||
|
name = "unicode-ident" |
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|
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||||
|
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||||
|
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||||
|
|
||||
|
[[package]] |
||||
|
name = "version_check" |
||||
|
version = "0.9.4" |
||||
|
source = "registry+https://github.com/rust-lang/crates.io-index" |
||||
|
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||||
|
|
||||
|
[[package]] |
||||
|
name = "wasi" |
||||
|
version = "0.11.0+wasi-snapshot-preview1" |
||||
|
source = "registry+https://github.com/rust-lang/crates.io-index" |
||||
|
checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423" |
||||
|
|
||||
|
[[package]] |
||||
|
name = "zerocopy" |
||||
|
version = "0.7.34" |
||||
|
source = "registry+https://github.com/rust-lang/crates.io-index" |
||||
|
checksum = "ae87e3fcd617500e5d106f0380cf7b77f3c6092aae37191433159dda23cfb087" |
||||
|
dependencies = [ |
||||
|
"zerocopy-derive", |
||||
|
] |
||||
|
|
||||
|
[[package]] |
||||
|
name = "zerocopy-derive" |
||||
|
version = "0.7.34" |
||||
|
source = "registry+https://github.com/rust-lang/crates.io-index" |
||||
|
checksum = "15e934569e47891f7d9411f1a451d947a60e000ab3bd24fbb970f000387d1b3b" |
||||
|
dependencies = [ |
||||
|
"proc-macro2", |
||||
|
"quote", |
||||
|
"syn 2.0.66", |
||||
|
] |
||||
|
|
||||
|
[[package]] |
||||
|
name = "zeroize" |
||||
|
version = "1.8.1" |
||||
|
source = "registry+https://github.com/rust-lang/crates.io-index" |
||||
|
checksum = "ced3678a2879b30306d323f4542626697a464a97c0a07c9aebf7ebca65cd4dde" |
||||
|
dependencies = [ |
||||
|
"zeroize_derive", |
||||
|
] |
||||
|
|
||||
|
[[package]] |
||||
|
name = "zeroize_derive" |
||||
|
version = "1.4.2" |
||||
|
source = "registry+https://github.com/rust-lang/crates.io-index" |
||||
|
checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69" |
||||
|
dependencies = [ |
||||
|
"proc-macro2", |
||||
|
"quote", |
||||
|
"syn 2.0.66", |
||||
|
] |
||||
@ -0,0 +1,26 @@ |
|||||
|
[package] |
||||
|
edition = "2021" |
||||
|
name = "arkeddsa" |
||||
|
version = "0.1.0" |
||||
|
|
||||
|
[dependencies] |
||||
|
|
||||
|
ark-crypto-primitives = {version = "^0.4.0", default-features = false, features = ["sponge", "crh"]} |
||||
|
ark-ec = "0.4" |
||||
|
ark-ed-on-bn254 = {version = "0.4.0"} |
||||
|
ark-ff = "0.4" |
||||
|
ark-serialize = "0.4" |
||||
|
ark-std = "0.4" |
||||
|
digest = "0.10.7" |
||||
|
rand = "0.8" |
||||
|
rand_core = {version = "0.6", default-features = false} |
||||
|
|
||||
|
[dev-dependencies] |
||||
|
ark-algebra-test-templates = "0.4.2" |
||||
|
ark-ed-on-bls12-381 = {version = "0.4.0"} |
||||
|
ark-ed-on-bls12-381-bandersnatch = {version = "0.4.0"} |
||||
|
blake2 = "0.10.6" |
||||
|
sha2 = "0.10.8" |
||||
|
|
||||
|
[features] |
||||
|
default = [] |
||||
@ -0,0 +1,5 @@ |
|||||
|
# arkeddsa |
||||
|
|
||||
|
Do not use in production. |
||||
|
|
||||
|
EDDSA signature scheme implementation with Poseidon hasher and ark-works backend. Additionally circom compatible `ed_on_bn254_twist` twist is available. |
||||
@ -0,0 +1,102 @@ |
|||||
|
use ark_ec::{
|
||||
|
models::CurveConfig,
|
||||
|
twisted_edwards::{Affine, MontCurveConfig, Projective, TECurveConfig},
|
||||
|
};
|
||||
|
use ark_ff::MontFp;
|
||||
|
pub type EdwardsAffine = Affine<EdwardsConfig>;
|
||||
|
pub type EdwardsProjective = Projective<EdwardsConfig>;
|
||||
|
|
||||
|
/// Twist of `Baby-JubJub` is a twist of twisted Edwards curve. These curves have equations of the
|
||||
|
/// form: ax² + y² = 1 + dx²y².
|
||||
|
/// over some base finite field BaseField.
|
||||
|
///
|
||||
|
/// q = 21888242871839275222246405745257275088548364400416034343698204186575808495617
|
||||
|
#[derive(Clone, Default, PartialEq, Eq)]
|
||||
|
pub struct EdwardsConfig;
|
||||
|
|
||||
|
#[cfg(test)]
|
||||
|
ark_algebra_test_templates::test_group!(te; EdwardsProjective; te);
|
||||
|
|
||||
|
impl CurveConfig for EdwardsConfig {
|
||||
|
type BaseField = ark_ed_on_bn254::Fq;
|
||||
|
type ScalarField = ark_ed_on_bn254::Fr;
|
||||
|
|
||||
|
/// COFACTOR = 8
|
||||
|
const COFACTOR: &'static [u64] = &[8];
|
||||
|
|
||||
|
/// COFACTOR^(-1) mod r =
|
||||
|
/// 2394026564107420727433200628387514462817212225638746351800188703329891451411
|
||||
|
const COFACTOR_INV: ark_ed_on_bn254::Fr =
|
||||
|
MontFp!("2394026564107420727433200628387514462817212225638746351800188703329891451411");
|
||||
|
}
|
||||
|
|
||||
|
impl TECurveConfig for EdwardsConfig {
|
||||
|
const COEFF_A: ark_ed_on_bn254::Fq = MontFp!("168700");
|
||||
|
|
||||
|
#[inline(always)]
|
||||
|
fn mul_by_a(elem: Self::BaseField) -> Self::BaseField {
|
||||
|
elem * <Self as TECurveConfig>::COEFF_A
|
||||
|
}
|
||||
|
|
||||
|
const COEFF_D: ark_ed_on_bn254::Fq = MontFp!("168696");
|
||||
|
|
||||
|
const GENERATOR: EdwardsAffine = EdwardsAffine::new_unchecked(GENERATOR_X, GENERATOR_Y);
|
||||
|
|
||||
|
type MontCurveConfig = EdwardsConfig;
|
||||
|
}
|
||||
|
|
||||
|
impl MontCurveConfig for EdwardsConfig {
|
||||
|
/// COEFF_A = 168698
|
||||
|
const COEFF_A: ark_ed_on_bn254::Fq = MontFp!("168698");
|
||||
|
/// COEFF_B = 168700
|
||||
|
const COEFF_B: ark_ed_on_bn254::Fq = MontFp!("1");
|
||||
|
|
||||
|
type TECurveConfig = EdwardsConfig;
|
||||
|
}
|
||||
|
|
||||
|
/// GENERATOR_X =
|
||||
|
/// 19698561148652590122159747500897617769866003486955115824547446575314762165298
|
||||
|
pub const GENERATOR_X: ark_ed_on_bn254::Fq =
|
||||
|
MontFp!("5299619240641551281634865583518297030282874472190772894086521144482721001553");
|
||||
|
|
||||
|
/// GENERATOR_Y =
|
||||
|
/// 19298250018296453272277890825869354524455968081175474282777126169995084727839
|
||||
|
pub const GENERATOR_Y: ark_ed_on_bn254::Fq =
|
||||
|
MontFp!("16950150798460657717958625567821834550301663161624707787222815936182638968203");
|
||||
|
|
||||
|
#[test]
|
||||
|
fn test_twist() {
|
||||
|
fn twist(twist: ark_ed_on_bn254::EdwardsAffine) -> EdwardsAffine {
|
||||
|
use ark_ff::Field;
|
||||
|
let inv_sqrt_a = MontFp!("168700").sqrt().unwrap().inverse().unwrap();
|
||||
|
EdwardsAffine {
|
||||
|
x: twist.x * inv_sqrt_a,
|
||||
|
y: twist.y,
|
||||
|
}
|
||||
|
}
|
||||
|
|
||||
|
fn untwist(curve: EdwardsAffine) -> ark_ed_on_bn254::EdwardsAffine {
|
||||
|
use ark_ff::Field;
|
||||
|
const A: ark_ed_on_bn254::Fq = MontFp!("168700");
|
||||
|
let sqrt_a = A.sqrt().unwrap();
|
||||
|
ark_ed_on_bn254::EdwardsAffine {
|
||||
|
x: curve.x * sqrt_a,
|
||||
|
y: curve.y,
|
||||
|
}
|
||||
|
}
|
||||
|
|
||||
|
use ark_ec::{AffineRepr, CurveGroup};
|
||||
|
use ark_ed_on_bn254::Fr;
|
||||
|
use ark_std::UniformRand;
|
||||
|
use rand_core::OsRng;
|
||||
|
|
||||
|
let v0: ark_ed_on_bn254::EdwardsAffine = ark_ed_on_bn254::EdwardsAffine::generator();
|
||||
|
let u0: crate::ed_on_bn254_twist::EdwardsAffine = twist(v0);
|
||||
|
assert!(u0.is_on_curve());
|
||||
|
assert!(u0.is_in_correct_subgroup_assuming_on_curve());
|
||||
|
let x = Fr::rand(&mut OsRng);
|
||||
|
let u1 = (u0 * x).into_affine();
|
||||
|
let v1 = (v0 * x).into_affine();
|
||||
|
let v2 = untwist(u1);
|
||||
|
assert_eq!(v1, v2);
|
||||
|
}
|
||||
@ -0,0 +1,143 @@ |
|||||
|
use crate::{signature::Signature, Error};
|
||||
|
use ark_crypto_primitives::sponge::{
|
||||
|
poseidon::{PoseidonConfig, PoseidonSponge},
|
||||
|
Absorb, CryptographicSponge,
|
||||
|
};
|
||||
|
use ark_ec::{twisted_edwards::TECurveConfig, AffineRepr, CurveGroup};
|
||||
|
use ark_ff::PrimeField;
|
||||
|
use digest::Digest;
|
||||
|
use digest::OutputSizeUser;
|
||||
|
use rand_core::CryptoRngCore;
|
||||
|
|
||||
|
fn prune_buffer<F: PrimeField>(mut bytes: [u8; 32]) -> F {
|
||||
|
bytes[0] &= 0b1111_1000;
|
||||
|
bytes[31] &= 0b0111_1111;
|
||||
|
bytes[31] |= 0b0100_0000;
|
||||
|
F::from_le_bytes_mod_order(&bytes[..])
|
||||
|
}
|
||||
|
|
||||
|
#[derive(Copy, Clone, Debug)]
|
||||
|
/// EdDSA secret key is 32 byte data
|
||||
|
pub struct SecretKey([u8; 32]);
|
||||
|
|
||||
|
impl SecretKey {
|
||||
|
fn expand<F: PrimeField, D: Digest>(&self) -> (F, [u8; 32]) {
|
||||
|
let hash = D::new().chain_update(self.0).finalize();
|
||||
|
let (buffer, hash_prefix) = hash.split_at(32);
|
||||
|
let buffer: [u8; 32] = buffer.try_into().unwrap();
|
||||
|
let hash_prefix: [u8; 32] = hash_prefix.try_into().unwrap();
|
||||
|
let x = prune_buffer(buffer);
|
||||
|
(x, hash_prefix)
|
||||
|
}
|
||||
|
}
|
||||
|
|
||||
|
#[derive(Copy, Clone, Debug)]
|
||||
|
/// `PublicKey` is EdDSA signature verification key
|
||||
|
pub struct PublicKey<A: AffineRepr>(A)
|
||||
|
where
|
||||
|
A::Config: TECurveConfig;
|
||||
|
|
||||
|
#[derive(Copy, Clone, Debug)]
|
||||
|
/// `SigningKey` produces EdDSA signatures for given message
|
||||
|
pub struct SigningKey<A: AffineRepr>
|
||||
|
where
|
||||
|
A::Config: TECurveConfig,
|
||||
|
{
|
||||
|
secret_key: SecretKey,
|
||||
|
public_key: PublicKey<A>,
|
||||
|
}
|
||||
|
|
||||
|
impl<A: AffineRepr> SigningKey<A>
|
||||
|
where
|
||||
|
A::Config: TECurveConfig,
|
||||
|
A::BaseField: PrimeField + Absorb,
|
||||
|
{
|
||||
|
pub fn new<D: Digest>(secret_key: &SecretKey) -> Result<Self, Error> {
|
||||
|
(<D as OutputSizeUser>::output_size() == 64)
|
||||
|
.then_some(())
|
||||
|
.ok_or(Error::BadOutputSize)?;
|
||||
|
|
||||
|
let (x, _) = secret_key.expand::<A::ScalarField, D>();
|
||||
|
let public_key: A = (A::generator() * x).into_affine();
|
||||
|
let signing_key = Self {
|
||||
|
secret_key: *secret_key,
|
||||
|
public_key: PublicKey(public_key),
|
||||
|
};
|
||||
|
|
||||
|
Ok(signing_key)
|
||||
|
}
|
||||
|
|
||||
|
pub fn generate<D: Digest>(rng: &mut impl CryptoRngCore) -> Result<Self, Error> {
|
||||
|
let mut secret_key = SecretKey([0; 32]);
|
||||
|
rng.fill_bytes(&mut secret_key.0);
|
||||
|
Self::new::<D>(&secret_key)
|
||||
|
}
|
||||
|
|
||||
|
pub fn public_key(&self) -> PublicKey<A> {
|
||||
|
self.public_key
|
||||
|
}
|
||||
|
|
||||
|
pub fn sign<D: Digest, E: Absorb>(
|
||||
|
&self,
|
||||
|
poseidon: &PoseidonConfig<A::BaseField>,
|
||||
|
message: &[E],
|
||||
|
) -> Signature<A> {
|
||||
|
let (x, prefix) = self.secret_key.expand::<A::ScalarField, D>();
|
||||
|
|
||||
|
let mut h = D::new();
|
||||
|
h.update(prefix);
|
||||
|
message
|
||||
|
.iter()
|
||||
|
.for_each(|m| h.update(m.to_sponge_bytes_as_vec()));
|
||||
|
let r: A::ScalarField = crate::from_digest(h);
|
||||
|
let sig_r = (A::generator() * r).into_affine();
|
||||
|
|
||||
|
let mut poseidon = PoseidonSponge::new(poseidon);
|
||||
|
let (sig_r_x, sig_r_y) = sig_r.xy().unwrap();
|
||||
|
poseidon.absorb(sig_r_x);
|
||||
|
poseidon.absorb(sig_r_y);
|
||||
|
let (vk_x, vk_y) = self.public_key.0.xy().unwrap();
|
||||
|
poseidon.absorb(vk_x);
|
||||
|
poseidon.absorb(vk_y);
|
||||
|
message.iter().for_each(|m| poseidon.absorb(m));
|
||||
|
|
||||
|
let k = poseidon.squeeze_field_elements::<A::ScalarField>(1);
|
||||
|
let k = k.first().unwrap();
|
||||
|
|
||||
|
let sig_s = (x * k) + r;
|
||||
|
|
||||
|
Signature::new(sig_r, sig_s)
|
||||
|
}
|
||||
|
}
|
||||
|
|
||||
|
impl<A: AffineRepr> PublicKey<A>
|
||||
|
where
|
||||
|
A::Config: TECurveConfig,
|
||||
|
A::BaseField: PrimeField + Absorb,
|
||||
|
{
|
||||
|
pub fn verify<E: Absorb>(
|
||||
|
&self,
|
||||
|
poseidon: &PoseidonConfig<A::BaseField>,
|
||||
|
message: &[E],
|
||||
|
signature: &Signature<A>,
|
||||
|
) -> Result<(), Error> {
|
||||
|
let mut poseidon = PoseidonSponge::new(poseidon);
|
||||
|
|
||||
|
let (sig_r_x, sig_r_y) = signature.r().xy().unwrap();
|
||||
|
poseidon.absorb(sig_r_x);
|
||||
|
poseidon.absorb(sig_r_y);
|
||||
|
let (vk_x, vk_y) = self.0.xy().unwrap();
|
||||
|
poseidon.absorb(vk_x);
|
||||
|
poseidon.absorb(vk_y);
|
||||
|
message.iter().for_each(|m| poseidon.absorb(m));
|
||||
|
|
||||
|
let k = poseidon.squeeze_field_elements::<A::ScalarField>(1);
|
||||
|
let k = k.first().unwrap();
|
||||
|
|
||||
|
let kx_b = self.0 * k;
|
||||
|
let s_b = A::generator() * signature.s();
|
||||
|
let r_rec: A = (s_b - kx_b).into();
|
||||
|
|
||||
|
(signature.r() == &r_rec).then_some(()).ok_or(Error::Verify)
|
||||
|
}
|
||||
|
}
|
||||
@ -0,0 +1,55 @@ |
|||||
|
pub mod ed_on_bn254_twist;
|
||||
|
pub mod eddsa;
|
||||
|
pub mod poseidon;
|
||||
|
pub mod signature;
|
||||
|
|
||||
|
use ark_ff::PrimeField;
|
||||
|
use digest::Digest;
|
||||
|
pub use eddsa::*;
|
||||
|
|
||||
|
pub(crate) fn from_digest<F: PrimeField, D: Digest>(digest: D) -> F {
|
||||
|
let bytes = digest.finalize();
|
||||
|
F::from_le_bytes_mod_order(&bytes)
|
||||
|
}
|
||||
|
|
||||
|
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
|
||||
|
pub enum Error {
|
||||
|
Verify,
|
||||
|
BadOutputSize,
|
||||
|
InvalidData,
|
||||
|
}
|
||||
|
|
||||
|
#[cfg(test)]
|
||||
|
mod test {
|
||||
|
use ark_crypto_primitives::sponge::Absorb;
|
||||
|
use ark_ec::{twisted_edwards::TECurveConfig, AffineRepr};
|
||||
|
use ark_ff::PrimeField;
|
||||
|
use digest::Digest;
|
||||
|
use rand_core::OsRng;
|
||||
|
|
||||
|
use crate::SigningKey;
|
||||
|
|
||||
|
fn run_test<A: AffineRepr, D: Digest>()
|
||||
|
where
|
||||
|
A::BaseField: Absorb + PrimeField,
|
||||
|
A::Config: TECurveConfig,
|
||||
|
{
|
||||
|
let poseidon = crate::poseidon::poseidon_config(4, 8, 55);
|
||||
|
let signing_key = SigningKey::<A>::generate::<D>(&mut OsRng).unwrap();
|
||||
|
let message = b"xxx yyy <<< zzz >>> bunny";
|
||||
|
let signature = signing_key.sign::<D, _>(&poseidon, &message[..]);
|
||||
|
let public_key = signing_key.public_key();
|
||||
|
public_key
|
||||
|
.verify::<_>(&poseidon, &message[..], &signature)
|
||||
|
.unwrap();
|
||||
|
}
|
||||
|
|
||||
|
#[test]
|
||||
|
fn test_eddsa() {
|
||||
|
run_test::<ark_ed_on_bn254::EdwardsAffine, sha2::Sha512>();
|
||||
|
run_test::<ark_ed_on_bn254::EdwardsAffine, blake2::Blake2b512>();
|
||||
|
run_test::<crate::ed_on_bn254_twist::EdwardsAffine, sha2::Sha512>();
|
||||
|
run_test::<ark_ed_on_bls12_381::EdwardsAffine, sha2::Sha512>();
|
||||
|
run_test::<ark_ed_on_bls12_381_bandersnatch::EdwardsAffine, sha2::Sha512>();
|
||||
|
}
|
||||
|
}
|
||||
@ -0,0 +1,19 @@ |
|||||
|
use ark_crypto_primitives::sponge::poseidon::{find_poseidon_ark_and_mds, PoseidonConfig};
|
||||
|
use ark_ff::PrimeField;
|
||||
|
|
||||
|
/// Generates poseidon constants and returns the config
|
||||
|
pub fn poseidon_config<F: PrimeField>(
|
||||
|
rate: usize,
|
||||
|
full_rounds: usize,
|
||||
|
partial_rounds: usize,
|
||||
|
) -> PoseidonConfig<F> {
|
||||
|
let prime_bits = F::MODULUS_BIT_SIZE as u64;
|
||||
|
let (ark, mds) = find_poseidon_ark_and_mds(
|
||||
|
prime_bits,
|
||||
|
rate,
|
||||
|
full_rounds as u64,
|
||||
|
partial_rounds as u64,
|
||||
|
0,
|
||||
|
);
|
||||
|
PoseidonConfig::new(full_rounds, partial_rounds, 5, mds, ark, rate, 1)
|
||||
|
}
|
||||
@ -0,0 +1,56 @@ |
|||||
|
use crate::Error;
|
||||
|
use ark_ec::twisted_edwards::TECurveConfig;
|
||||
|
use ark_ec::AffineRepr;
|
||||
|
use ark_serialize::CanonicalDeserialize;
|
||||
|
use ark_serialize::CanonicalSerialize;
|
||||
|
|
||||
|
#[derive(Clone, Copy, Debug)]
|
||||
|
/// `SignatureComponents` contains the realized parts of a signature
|
||||
|
pub struct Signature<A: AffineRepr> {
|
||||
|
r: A,
|
||||
|
s: A::ScalarField,
|
||||
|
}
|
||||
|
|
||||
|
impl<A: AffineRepr> Signature<A>
|
||||
|
where
|
||||
|
A::Config: TECurveConfig,
|
||||
|
{
|
||||
|
/// Serializes the signature components to bytes as uncompressed.
|
||||
|
/// Expect output size to be `size_of(A::BaseField) * 2 + size_of(A::ScalarField)`
|
||||
|
pub fn to_bytes(&self) -> Vec<u8> {
|
||||
|
let mut bytes = Vec::new();
|
||||
|
self.r.serialize_uncompressed(&mut bytes).unwrap();
|
||||
|
self.s.serialize_uncompressed(&mut bytes).unwrap();
|
||||
|
bytes
|
||||
|
}
|
||||
|
|
||||
|
/// Checked deserialization of the signature components from bytes.
|
||||
|
/// Expects input size to be `size_of(A::BaseField) * 2 + size_of(A::ScalarField)`
|
||||
|
pub fn from_bytes(bytes: &[u8]) -> Result<Signature<A>, Error> {
|
||||
|
let point_size = A::Config::serialized_size(ark_serialize::Compress::No);
|
||||
|
(bytes.len() == 32 + A::Config::serialized_size(ark_serialize::Compress::No))
|
||||
|
.then_some(true)
|
||||
|
.ok_or(Error::InvalidData)?;
|
||||
|
|
||||
|
let off1 = point_size;
|
||||
|
let off2 = off1 + 32;
|
||||
|
|
||||
|
let r =
|
||||
|
A::deserialize_uncompressed(&bytes[00..off1]).map_err(|_| crate::Error::InvalidData)?;
|
||||
|
let s = A::ScalarField::deserialize_uncompressed(&bytes[off1..off2])
|
||||
|
.map_err(|_| crate::Error::InvalidData)?;
|
||||
|
Ok(Signature { r, s })
|
||||
|
}
|
||||
|
|
||||
|
pub fn new(r: A, s: A::ScalarField) -> Self {
|
||||
|
Self { r, s }
|
||||
|
}
|
||||
|
|
||||
|
pub(crate) fn r(&self) -> &A {
|
||||
|
&self.r
|
||||
|
}
|
||||
|
|
||||
|
pub(crate) fn s(&self) -> &A::ScalarField {
|
||||
|
&self.s
|
||||
|
}
|
||||
|
}
|
||||