crypto-signer

High-performance, low-latency, lightweight multi-chain signing primitives in Rust.

Feature Flags

• evm: EIP-712 domain/message signing primitives
• bitcoin: Bitcoin module stubs
• solana: Solana module stubs
• cosmos: Cosmos SignDoc protobuf encoding and SHA-256 signing hash
• kms: KMS backend extension point
• hw: hardware wallet extension point
• k256-signer: local secp256k1 signer backend
• ed25519-signer: local Ed25519 signer backend
• serde: serde derives
• std: standard library support

Default features: std, evm, k256-signer.

Specs & Standards

All implementations are spec-driven and validated against official test vectors:

• EIP-712: Official Mail example
• EIP-2612: Permit typehash constant verified against reference implementations
• Cosmos: Protobuf SignDoc SHA-256 signing as per Tendermint/Cosmos SDK

Usage

The core pattern is generic and typestate-driven:

• TypedMessage<T, Unsigned> for pre-signing
• TypedMessage<T, Signed> for post-signing
• Eip712Type implemented once per payload type

Each new EIP-712 message requires only a data struct + one trait impl.

Performance

Benchmarks on modern hardware (LTO + fat codegen):

Run locally: cargo bench --bench eip712 --features evm,k256-signer

Quick Start

use crypto_signer::{Address, Domain, PermitBuilder};

let domain = Domain::new("USDC", "1", 137, Address::new([0x11; 20]));

let _unsigned = PermitBuilder::new(domain)
	.spender(Address::new([0x22; 20]))
	.value(1_000_000)
	.nonce(0)
	.deadline(1_700_000_000);

Quality Gates and Getting Started

CI runs on every push:

• cargo fmt --check — code style
• cargo clippy --all-targets --all-features -- -D warnings — lint warnings denied
• cargo test --all-features --all-targets — all tests with all feature combinations
• cargo check --no-default-features — no_std compatibility gate
• cargo bench --bench eip712 — performance regression detection
• cargo audit — vulnerability scanning
• cargo deny check advisories licenses bans sources — supply chain policy enforcement
• cargo llvm-cov --all-features --summary-only --fail-under-lines 90 — code coverage floor at 90%

Buy me a coffee

• ETH/Polygon: 0xCba7FBDe48C6F7A496f7c8304eCB8a813c234C02
• BTC: bc1qf5jenprghcuazckeycx0k3h5hn46a3qetec4m2
• SOL: 9NRLGeyxQA6nJ2b1wkFpJGtQJ7xudFEqthXRKguXzdd4

Thank you!

LICENSE

MIT