重构：RustCrypto 兼容接口
主要变更： - 新增 sm2/、sm3/、sm4/ 独立 crate，实现 RustCrypto traits - sm2：实现 signature、elliptic-curve traits - sm3：实现 digest、crypto-common traits - sm4：实现 cipher、aead traits - 新增 fuzz/ 模糊测试目标 - 新增 tests/sm2_proptest.rs 属性测试 - 重构 src/sm4/ 使用 RustCrypto AEAD traits - 更新 CI 工作流支持多 crate 测试 - 更新 .gitignore 忽略 fuzz/target/
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# sm2
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**SM2 椭圆曲线公钥密码算法** — 纯 Rust、`no_std`、常量时间实现，符合 GB/T 32918-2016。
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**SM2 Elliptic Curve Public-Key Cryptography** — Pure-Rust, `no_std`, constant-time implementation conforming to GB/T 32918-2016.
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[](https://crates.io/crates/sm2)
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[](https://docs.rs/sm2)
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[](../LICENSE)
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---
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## 目录 / Table of Contents
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- [功能 / Features](#功能--features)
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- [快速开始 / Quick Start](#快速开始--quick-start)
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- [API 概览 / API Overview](#api-概览--api-overview)
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- [安全性 / Security](#安全性--security)
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- [Feature 标志 / Feature Flags](#feature-标志--feature-flags)
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- [依赖 / Dependencies](#依赖--dependencies)
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---
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## 功能 / Features
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**中文：** 本 crate 实现以下 GB/T 32918-2016 标准算法：
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**English:** This crate implements the following GB/T 32918-2016 standard algorithms:
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| 功能 / Feature | 函数/类型 / Function / Type | 标准 / Standard |
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|---|---|---|
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| 密钥生成 / Key Generation | `generate_keypair` | GB/T 32918.1 §6.1 |
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| 数字签名 / Digital Signature | `sign`, `sign_message`, `SigningKey` | GB/T 32918.2 §6.2 |
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| 签名验证 / Verification | `verify`, `verify_message`, `VerifyingKey` | GB/T 32918.2 §6.3 |
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| 公钥加密 / Encryption | `encrypt` | GB/T 32918.4 §7.1 |
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| 公钥解密 / Decryption | `decrypt` | GB/T 32918.4 §7.2 |
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| 密钥交换 / Key Exchange | `key_exchange::ecdh`, `exchange_a/b` | GB/T 32918.3 |
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| DER 编解码 / DER Encoding | `der::sig_to_der`, `private_key_from_pkcs8_der` | RFC 5915/5480 |
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---
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## 快速开始 / Quick Start
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在 `Cargo.toml` 中添加 / Add to your `Cargo.toml`:
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```toml
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[dependencies]
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sm2 = { path = "path/to/sm2" }
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# 或 crates.io 发布后 / or after crates.io release:
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# sm2 = "0.1"
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```
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### 签名与验签 / Sign and Verify
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```rust
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use sm2::{SigningKey, VerifyingKey, DEFAULT_ID, generate_keypair};
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use sm2::signature::{Signer, Verifier};
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use rand_core::OsRng;
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// 生成密钥对 / Generate key pair
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let (private_key, public_key_bytes) = generate_keypair(&mut OsRng);
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// 创建签名/验证密钥 / Create signing and verifying keys
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let signing_key = SigningKey::new(private_key, DEFAULT_ID);
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let verifying_key = VerifyingKey::new(public_key_bytes, DEFAULT_ID);
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// 签名 / Sign
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let message = b"Hello, SM2!";
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let signature = signing_key.sign(message);
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// 验签 / Verify
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verifying_key.verify(message, &signature).expect("验签应通过 / verification should pass");
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```
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### 底层签名 API / Low-level Signing API
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```rust
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use sm2::{PrivateKey, generate_keypair, get_z, get_e, sign, verify, DEFAULT_ID};
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use rand_core::OsRng;
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let (pri_key, pub_key) = generate_keypair(&mut OsRng);
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// 计算 Z 值和摘要 / Compute Z-value and digest
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let z = get_z(DEFAULT_ID, &pub_key);
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let e = get_e(&z, b"my message");
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// 签名 / Sign
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let sig = sign(&e, &pri_key, &mut OsRng);
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// 验签 / Verify
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verify(&e, &pub_key, &sig).expect("ok");
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```
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### 公钥加解密 / Public-key Encrypt / Decrypt
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```rust
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# #[cfg(feature = "alloc")]
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use sm2::{encrypt, decrypt, generate_keypair};
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use rand_core::OsRng;
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let (pri_key, pub_key) = generate_keypair(&mut OsRng);
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let plaintext = b"secret message";
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let ciphertext = encrypt(&pub_key, plaintext, &mut OsRng).unwrap();
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let recovered = decrypt(&pri_key, &ciphertext).unwrap();
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assert_eq!(recovered, plaintext);
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```
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密文格式为 `C1 || C3 || C2`（65 + 32 + n 字节），符合 GB/T 32918.4 §6.1。
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Ciphertext format: `C1 || C3 || C2` (65 + 32 + n bytes), per GB/T 32918.4 §6.1.
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### SM2-ECDH 密钥交换 / Key Exchange
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```rust
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use sm2::{generate_keypair, key_exchange::ecdh};
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use rand_core::OsRng;
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let (pri_a, pub_a) = generate_keypair(&mut OsRng);
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let (pri_b, pub_b) = generate_keypair(&mut OsRng);
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// 双方各自计算，结果一致 / Both parties compute the same shared secret
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let shared_a = ecdh(&pri_a, &pub_b).unwrap();
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let shared_b = ecdh(&pri_b, &pub_a).unwrap();
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assert_eq!(shared_a, shared_b);
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```
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---
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## API 概览 / API Overview
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### 类型 / Types
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| 类型 / Type | 说明 / Description |
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|---|---|
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| `PrivateKey` | SM2 私钥（32 字节，离开作用域自动清零）/ SM2 private key (auto-zeroized on drop) |
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| `SigningKey<'id>` | 签名密钥（私钥 + 用户 ID）/ Signing key (private key + user ID) |
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| `VerifyingKey<'id>` | 验证密钥（公钥 + 用户 ID）/ Verifying key (public key + user ID) |
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| `Sm2Signature` | 签名结果（r\|\|s，64 字节）/ Signature (r\|\|s, 64 bytes) |
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| `key_exchange::EphemeralKey` | 密钥交换临时密钥对 / Ephemeral key pair for key exchange |
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| `Error` | 统一错误类型 / Unified error type |
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### 常量 / Constants
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| 常量 / Constant | 值 / Value | 说明 / Description |
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| `DEFAULT_ID` | `b"1234567812345678"` | GB/T 32918.2 §A.2 示例用户 ID / Example user ID from spec |
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### 关键函数 / Key Functions
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```
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generate_keypair(rng) → (PrivateKey, [u8; 65])
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get_z(id, pub_key) → [u8; 32]
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get_e(z, msg) → [u8; 32]
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sign(e, pri_key, rng) → [u8; 64]
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sign_message(msg, id, pri, rng) → [u8; 64]
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verify(e, pub_key, sig) → Result<(), Error>
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verify_message(msg, id, pub, sig) → Result<(), Error>
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encrypt(pub_key, msg, rng) → Result<Vec<u8>, Error> // alloc
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decrypt(pri_key, ciphertext) → Result<Vec<u8>, Error> // alloc
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```
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---
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## 安全性 / Security
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**中文：**
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- **常量时间**：所有私钥相关运算均为常量时间（Montgomery 域算术 + `subtle::ConditionallySelectable`）
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- **标量乘法**：固定迭代 256 位，不跳过前导零，防止时序侧信道
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- **自动清零**：`PrivateKey` 离开作用域后自动清零（[`ZeroizeOnDrop`]）
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- **无 unsafe**：全 crate 使用 `#![forbid(unsafe_code)]`
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- **SM4 S-box**：（通过 `sm4` 依赖）使用布尔电路位切片实现，无查表
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**English:**
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- **Constant-time**: All secret-dependent operations use Montgomery-domain arithmetic + `subtle::ConditionallySelectable`
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- **Scalar multiplication**: Iterates all 256 bits regardless of leading zeros — no timing leakage
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- **Auto-zeroize**: `PrivateKey` is automatically cleared on drop via [`ZeroizeOnDrop`]
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- **No unsafe code**: The entire crate is `#![forbid(unsafe_code)]`
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- **Bitslice S-box**: (via `sm4` dependency) uses boolean-circuit implementation, no table lookups
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> **危险 API / Dangerous API**: `sign_with_k` 仅在启用 `hazmat` feature 时可用，用于测试向量验证。误用相同 k 值会泄露私钥。
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>
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> `sign_with_k` is only available with the `hazmat` feature, intended for test-vector validation only. Reusing k across signatures leaks the private key.
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---
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## Feature 标志 / Feature Flags
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| Feature | 默认启用 / Default | 说明 / Description |
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| `alloc` | ✅ | 启用 `encrypt`/`decrypt` 和 DER 编码（需要 `Vec`）/ Enables `encrypt`/`decrypt` and DER encoding (requires `Vec`) |
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| `hazmat` | ❌ | 暴露 `sign_with_k`（危险的固定 k 签名，仅用于测试）/ Exposes `sign_with_k` (dangerous fixed-k signing, test only) |
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---
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## 依赖 / Dependencies
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| Crate | 版本 / Version | 用途 / Purpose |
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| `sm3` | workspace | SM3 哈希（Z 值、消息摘要、KDF）/ SM3 hash (Z-value, digest, KDF) |
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| `crypto-bigint` | 0.6 | 常量时间大整数（Montgomery 域）/ Constant-time big integers |
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| `subtle` | 2.6 | 常量时间比较 / Constant-time comparisons |
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| `zeroize` | 1.8 | 密钥安全清零 / Secure key zeroization |
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| `rand_core` | 0.6 | RNG trait（含 OsRng）/ RNG traits (including OsRng) |
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| `signature` | 2.2 | `Signer`/`Verifier` trait 集成 / `Signer`/`Verifier` trait integration |
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---
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## 许可证 / License
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Apache-2.0 — 见 / see [`LICENSE`](../LICENSE)
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---
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## 参考标准 / Reference Standards
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- GB/T 32918.1-2016：SM2 公钥密码算法 第1部分：总则
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- GB/T 32918.2-2016：SM2 公钥密码算法 第2部分：数字签名算法
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- GB/T 32918.3-2016：SM2 公钥密码算法 第3部分：密钥交换协议
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- GB/T 32918.4-2016：SM2 公钥密码算法 第4部分：公钥加密算法
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- GB/T 32918.5-2017：SM2 公钥密码算法 第5部分：参数定义
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