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RISK. +""" + +[lib] +crate-type = ["cdylib"] + +[dependencies] +soroban-sdk = { version = "22.0.0-rc.3"} + +[dev-dependencies] +soroban-sdk = { version = "22.0.0-rc.3", features = ["testutils"] } +hex-literal = { version = "0.4.1"} +rand = { version = "0.7.3" } + +[profile.release] +opt-level = "z" +overflow-checks = true +debug = 0 +strip = "symbols" +debug-assertions = false +panic = "abort" +codegen-units = 1 +lto = true + +[profile.release-with-logs] +inherits = "release" +debug-assertions = true diff --git a/bls_signature/Makefile b/bls_signature/Makefile new file mode 100644 index 00000000..7f774ad1 --- /dev/null +++ b/bls_signature/Makefile @@ -0,0 +1,16 @@ +default: build + +all: test + +test: build + cargo test + +build: + stellar contract build + @ls -l target/wasm32-unknown-unknown/release/*.wasm + +fmt: + cargo fmt --all + +clean: + cargo clean diff --git a/bls_signature/README b/bls_signature/README new file mode 100644 index 00000000..54f1d13a --- /dev/null +++ b/bls_signature/README @@ -0,0 +1,11 @@ +# BLS Signature Custom Account + +This repository contains a basic custom account contract implementing the `FastAggregateVerify` function, following the specifications outlined in the [BLS Signatures](https://www.ietf.org/archive/id/draft-irtf-cfrg-bls-signature-05.html#name-fastaggregateverify) draft. + +## ⚠️ WARNING: Demonstration Use Only + +**This project is for demonstration purposes only.** +- It has **not** undergone security auditing. +- It is **not** safe for use in production environments. + +**Use at your own risk.** \ No newline at end of file diff --git a/bls_signature/src/lib.rs b/bls_signature/src/lib.rs new file mode 100644 index 00000000..7ba535ed --- /dev/null +++ b/bls_signature/src/lib.rs @@ -0,0 +1,109 @@ +//! This is a basic custom account contract that implements the +//! `FastAggregateVerify` function in [BLS +//! Signatures](https://www.ietf.org/archive/id/draft-irtf-cfrg-bls-signature-05.html#name-fastaggregateverify) +//! +//! ⚠️ WARNING: it is indended for demonstration purpose only. It is not +//! security-audited and not safe to use in production (e.g. there is no proof +//! of possesion for the public key described in section 3.3). +#![no_std] +use soroban_sdk::{ + auth::{Context, CustomAccountInterface}, + bytesn, contract, contracterror, contractimpl, contracttype, + crypto::{ + bls12_381::{G1Affine, G2Affine}, + Hash, + }, + vec, Bytes, BytesN, Env, Vec, +}; + +#[contract] +pub struct IncrementContract; + +// `DST `is the domain separation tag, intended to keep hashing inputs of your +// contract separate. Refer to section 3.1 in the [Hashing to Elliptic +// Curves](https://datatracker.ietf.org/doc/html/rfc9380) on requirements of +// DST. +const DST: &str = "BLSSIG-V01-CS01-with-BLS12381G2_XMD:SHA-256_SSWU_RO_"; + +#[derive(Clone)] +#[contracttype] +pub enum DataKey { + Owners, + Counter, + Dst, +} + +#[contracterror] +#[derive(Copy, Clone, Debug, Eq, PartialEq, PartialOrd, Ord)] +#[repr(u32)] +pub enum AccError { + InvalidSignature = 1, +} + +#[contractimpl] +impl IncrementContract { + pub fn init(env: Env, agg_pk: BytesN<96>) { + // Initialize the account contract essentials: the aggregated pubkey and + // the DST. Because the message to be signed (which is + // the hash of some call stack) is the same for all signers, we can + // simply aggregate all signers (adding up the G1 pubkeys) and store it. + env.storage().persistent().set(&DataKey::Owners, &agg_pk); + env.storage() + .instance() + .set(&DataKey::Dst, &Bytes::from_slice(&env, DST.as_bytes())); + // initialize the counter, i.e. the business logic this signer contract + // guards + env.storage().instance().set(&DataKey::Counter, &0_u32); + } + + pub fn increment(env: Env) -> u32 { + env.current_contract_address().require_auth(); + let mut count: u32 = env.storage().instance().get(&DataKey::Counter).unwrap_or(0); + count += 1; + env.storage().instance().set(&DataKey::Counter, &count); + count + } +} + +#[contractimpl] +impl CustomAccountInterface for IncrementContract { + type Signature = BytesN<192>; + + type Error = AccError; + + #[allow(non_snake_case)] + fn __check_auth( + env: Env, + signature_payload: Hash<32>, + agg_sig: Self::Signature, + _auth_contexts: Vec, + ) -> Result<(), AccError> { + // The sdk module containing access to the bls12_381 functions + let bls = env.crypto().bls12_381(); + + // Retrive the aggregated pubkey and the DST from storage + let agg_pk: BytesN<96> = env.storage().persistent().get(&DataKey::Owners).unwrap(); + let dst: Bytes = env.storage().instance().get(&DataKey::Dst).unwrap(); + + // This is the negative of g1 (generator point of the G1 group) + let neg_g1 = G1Affine::from_bytes(bytesn!(&env, 0x17f1d3a73197d7942695638c4fa9ac0fc3688c4f9774b905a14e3a3f171bac586c55e83ff97a1aeffb3af00adb22c6bb114d1d6855d545a8aa7d76c8cf2e21f267816aef1db507c96655b9d5caac42364e6f38ba0ecb751bad54dcd6b939c2ca)); + // Hash the signature_payload i.e. the msg being signed and to be + // verified into a point in G2 + let msg_g2 = bls.hash_to_g2(&signature_payload.into(), &dst); + + // Prepare inputs to the pairing function + let vp1 = vec![&env, G1Affine::from_bytes(agg_pk), neg_g1]; + let vp2 = vec![&env, msg_g2, G2Affine::from_bytes(agg_sig)]; + + // Perform the pairing check, i.e. e(pk, msg)*e(-g1, sig) == 1, which is + // equivalent to checking `e(pk, msg) == e(g1, sig)`. + // The LHS = e(sk * g1, msg) = sk * e(g1, msg) = e(g1, sk * msg) = e(g1, sig), + // thus it must equal to the RHS if the signature matches. + if !bls.pairing_check(vp1, vp2) { + return Err(AccError::InvalidSignature); + } + Ok(()) + } +} + +mod test; diff --git a/bls_signature/src/test.rs b/bls_signature/src/test.rs new file mode 100644 index 00000000..8119aa70 --- /dev/null +++ b/bls_signature/src/test.rs @@ -0,0 +1,119 @@ +#![cfg(test)] +extern crate std; + +use soroban_sdk::{ + crypto::bls12_381::{Fr, G1Affine, G2Affine}, + testutils::BytesN as _, + vec, Bytes, BytesN, Env, Vec, +}; + +use crate::{AccError, IncrementContract, IncrementContractClient}; + +use hex_literal::hex; + +#[derive(Debug)] +pub struct KeyPair { + pub sk: [u8; 32], + pub pk: [u8; 96], +} + +const DST: &str = "BLSSIG-V01-CS01-with-BLS12381G2_XMD:SHA-256_SSWU_RO_"; + +static KEY_PAIRS: &[KeyPair] = &[ + KeyPair { + sk: hex!("18a5ac3cfa6d0b10437a92c96f553311fc0e25500d691ae4b26581e6f925ec83"), + pk: hex!("0914e32703bad05ccf4180e240e44e867b26580f36e09331997b2e9effe1f509b1a804fc7ba1f1334c8d41f060dd72550901c5549caef45212a236e288a785d762a087092c769bfa79611b96d73521ddd086b7e05b5c7e4210f50c2ee832e183"), + }, + KeyPair { + sk: hex!("738dbecafa122ee3c953f07e78461a4281cadec00c869098bac48c8c57b63374"), + pk: hex!("05f4708a013699229f67d0e16f7c2af8a6557d6d11b737286cfb9429e092c31c412f623d61c7de259c33701aa5387b5004e2c03e8b7ea2740b10a5b4fd050eecca45ccf5588d024cbb7adc963006c29d45a38cb7a06ce2ac45fce52fc0d36572"), + }, + KeyPair { + sk: hex!("4bff25b53f29c8af15cf9b8e69988c3ff79c80811d5027c80920f92fad8d137d"), + pk: hex!("18d0fef68a72e0746f8481fa72b78f945bf75c3a1e036fbbde62a421d8f9568a2ded235a27ad3eb0dc234b298b54dd540f61577bc4c6e8842f8aa953af57a6783924c479e78b0d4959038d3d108b3f6dc6a1b02ec605cb6d789af16cfe67f689"), + }, + KeyPair { + sk: hex!("2110f7dae25c4300e1a9681bad6311a547269dba69e94efd342cc208ff50813b"), + pk: hex!("1643b04cc21f8af9492509c51a6e20e67fa7923f4fbd52f6fcf73c6a4013f864e3e29eb03f54d234582250ebb5df21140381d0c735e868adfe62f85cf8e85d279864333dbe70656a5f35ebc52c5b497f1c65c7a0144bb0c9a1d843f1a8fb9979"), + }, + KeyPair { + sk: hex!("1e4b6d54ac58d317cbe6fb0472c3cbf2e60ea157edea21354cbc198770f81448"), + pk: hex!("02286d1a83a93f35c3461dd71d0840e83e1cd3275ee1af1bfd90ec2366485e9f7f18730f5b686f4810480f1ce5c63dca13a2fac1774aa4e22c29abb9280796d72a2bd0ef963dc76fd45090012bae4a727a6dce49550d9bc9776705f825e24731"), + }, + KeyPair { + sk: hex!("471145761f5cd9d0a9a511f1a80657edfcddc43424e4a5582040ea75c4649909"), + pk: hex!("0b7920a3f2a50cfd6dc132a46b7163d3f7d6b1d03d9fcf450eb05dfa89991a269e707e3412270dc422b664d7adda782c11c973232e975ef0d4b4fb5626b563df542fd1862f80bce17cd09bcbce8884bdda4ac9286bf94854dd29cd511a9103a7"), + }, + KeyPair { + sk: hex!("1914beab355b0a86a7bcd37f2e036a9c2c6bff7f16d8bf3e23e42b7131b44701"), + pk: hex!("1872237fb7ceccc1a6e85f83988c226cc47db75496e41cf20e8a4b93e8fd5e91d0cdcc3b2946a352223ec2b7817a2aae0dc4e6bb7b97c855828670362fcbd0ad6453f28e4fa4b7a075ac8bb1d69a4a1bb8c6723900fead307239f04a9bcec0ad"), + }, + KeyPair { + sk: hex!("46b19b928638068780ba82e76dfeaeaf5c37790cdf37f580e206dc6599c72dc7"), + pk: hex!("0fd1a6b1e46b83a197bbf1dc2a854d024caa5ead5a54893c9767392c837d7c070e86a9206ddba1801332f9d74e0f78e9175419ccc40a966bf4c12a7f8500519e2b83cebd61e32121379911925bf7ae6d2c0d8ec4dcc411d4bbcd14763c1a9d31"), + }, + KeyPair { + sk: hex!("0ce3cd1dcaecf002715228aeb0645c6a7fd9990ace3d79515c547dac120bb9f7"), + pk: hex!("19f7e9dcd4ce2bef92180b60d0c7c7b48b1924a36f9fbb93e9ecb8acb3219e26033b83facd4dc6d2e3f9fa0fffafeca8168bd4824e31dc9dfd977fbf037210508bc807c1a6d20f98a044911f6b689328f3f25dd35a6c05e8c6ac3ac6ef0def91"), + }, + KeyPair { + sk: hex!("6b4b27ba3ffc953eff3b974142cdac75f98c8c4ab26f93d5adfd49da5d462c3f"), + pk: hex!("15f55ec5572026d6c3c7c62b3ce3c5d7539045e9f492f2b1b0860c0af5f5f6b34531dfe4626a92d5c23ac6ad44330cf40e63a8a7234edbb41539c5484eff2cd23b2f0d502a7fd74501b1a05ffee29b24e79cb1ee9fb9b804d84f486283101ee0"), + }, +]; + +fn aggregate_pk_bytes(env: &Env) -> BytesN<96> { + let bls = env.crypto().bls12_381(); + let mut agg_pk = G1Affine::from_bytes(BytesN::from_array(env, &KEY_PAIRS[0].pk)); + for i in 1..KEY_PAIRS.len() { + let pk = G1Affine::from_bytes(BytesN::from_array(env, &KEY_PAIRS[i].pk)); + agg_pk = bls.g1_add(&agg_pk, &pk); + } + agg_pk.to_bytes() +} + +fn sign_and_aggregate(env: &Env, msg: &Bytes) -> BytesN<192> { + let bls = env.crypto().bls12_381(); + let mut vec_sk: Vec = vec![env]; + for kp in KEY_PAIRS { + vec_sk.push_back(Fr::from_bytes(BytesN::from_array(env, &kp.sk))); + } + let dst = Bytes::from_slice(env, DST.as_bytes()); + let msg_g2 = bls.hash_to_g2(&msg, &dst); + let vec_msg: Vec = vec![ + env, + msg_g2.clone(), + msg_g2.clone(), + msg_g2.clone(), + msg_g2.clone(), + msg_g2.clone(), + msg_g2.clone(), + msg_g2.clone(), + msg_g2.clone(), + msg_g2.clone(), + msg_g2.clone(), + ]; + bls.g2_msm(vec_msg, vec_sk).to_bytes() +} + +fn create_client(e: &Env) -> IncrementContractClient { + IncrementContractClient::new(e, &e.register(IncrementContract {}, ())) +} + +#[test] +fn test() { + let env = Env::default(); + env.budget().reset_unlimited(); + let pk = aggregate_pk_bytes(&env); + env.mock_all_auths(); + + let client = create_client(&env); + client.init(&pk); + let payload = BytesN::random(&env); + let sig_val = sign_and_aggregate(&env, &payload.clone().into()).to_val(); + + env.budget().reset_default(); + env.try_invoke_contract_check_auth::(&client.address, &payload, sig_val, &vec![&env]) + .unwrap(); + env.budget().print(); +}