# sm-crypto
小程序 js 库。国密算法 sm2、sm3 和 sm4 的实现。
> 使用此组件需要依赖小程序基础库 2.2.1 以上版本,同时依赖开发者工具的 npm 构建。具体详情可查阅[官方 npm 文档](https://developers.weixin.qq.com/miniprogram/dev/devtools/npm.html)。
## 安装
```bash
npm install --save miniprogram-sm-crypto
```
## sm2
### 获取密钥对
```js
const sm2 = require('miniprogram-sm-crypto').sm2
let keypair = sm2.generateKeyPairHex()
publicKey = keypair.publicKey // 公钥
privateKey = keypair.privateKey // 私钥
// 默认生成公钥 130 位太长,可以压缩公钥到 66 位
const compressedPublicKey = sm2.compressPublicKeyHex(publicKey) // compressedPublicKey 和 publicKey 等价
sm2.comparePublicKeyHex(publicKey, compressedPublicKey) // 判断公钥是否等价
// 自定义随机数,参数会直接透传给 jsbn 库的 BigInteger 构造器
// 注意:开发者使用自定义随机数,需要自行确保传入的随机数符合密码学安全
let keypair2 = sm2.generateKeyPairHex('123123123123123')
let keypair3 = sm2.generateKeyPairHex(256, SecureRandom)
let verifyResult = sm2.verifyPublicKey(publicKey) // 验证公钥
verifyResult = sm2.verifyPublicKey(compressedPublicKey) // 验证公钥
```
### 加密解密
```js
const sm2 = require('miniprogram-sm-crypto').sm2
const cipherMode = 1 // 1 - C1C3C2,0 - C1C2C3,默认为1
let encryptData = sm2.doEncrypt(msgString, publicKey, cipherMode) // 加密结果
let decryptData = sm2.doDecrypt(encryptData, privateKey, cipherMode) // 解密结果
encryptData = sm2.doEncrypt(msgArray, publicKey, cipherMode) // 加密结果,输入数组
decryptData = sm2.doDecrypt(encryptData, privateKey, cipherMode, {output: 'array'}) // 解密结果,输出数组
```
### 签名验签
> ps:理论上来说,只做纯签名是最快的。
```js
const sm2 = require('miniprogram-sm-crypto').sm2
// 纯签名 + 生成椭圆曲线点
let sigValueHex = sm2.doSignature(msg, privateKey) // 签名
let verifyResult = sm2.doVerifySignature(msg, sigValueHex, publicKey) // 验签结果
// 纯签名
let sigValueHex2 = sm2.doSignature(msg, privateKey, {
pointPool: [sm2.getPoint(), sm2.getPoint(), sm2.getPoint(), sm2.getPoint()], // 传入事先已生成好的椭圆曲线点,可加快签名速度
}) // 签名
let verifyResult2 = sm2.doVerifySignature(msg, sigValueHex2, publicKey) // 验签结果
// 纯签名 + 生成椭圆曲线点 + der编解码
let sigValueHex3 = sm2.doSignature(msg, privateKey, {
der: true,
}) // 签名
let verifyResult3 = sm2.doVerifySignature(msg, sigValueHex3, publicKey, {
der: true,
}) // 验签结果
// 纯签名 + 生成椭圆曲线点 + sm3杂凑
let sigValueHex4 = sm2.doSignature(msg, privateKey, {
hash: true,
}) // 签名
let verifyResult4 = sm2.doVerifySignature(msg, sigValueHex4, publicKey, {
hash: true,
}) // 验签结果
// 纯签名 + 生成椭圆曲线点 + sm3杂凑(不做公钥推导)
let sigValueHex5 = sm2.doSignature(msg, privateKey, {
hash: true,
publicKey, // 传入公钥的话,可以去掉sm3杂凑中推导公钥的过程,速度会比纯签名 + 生成椭圆曲线点 + sm3杂凑快
})
let verifyResult5 = sm2.doVerifySignature(msg, sigValueHex5, publicKey, {
hash: true,
publicKey,
})
// 纯签名 + 生成椭圆曲线点 + sm3杂凑 + 不做公钥推 + 添加 userId(长度小于 8192)
// 默认 userId 值为 1234567812345678
let sigValueHex6 = sm2.doSignature(msgString, privateKey, {
hash: true,
publicKey,
userId: 'testUserId',
})
let verifyResult6 = sm2.doVerifySignature(msgString, sigValueHex6, publicKey, {
hash: true,
userId: 'testUserId',
})
```
### 获取椭圆曲线点
```js
const sm2 = require('miniprogram-sm-crypto').sm2
let point = sm2.getPoint() // 获取一个椭圆曲线点,可在sm2签名时传入
```
## sm3
```js
const sm3 = require('miniprogram-sm-crypto').sm3
let hashData = sm3('abc') // 杂凑
// hmac
hashData = sm3('abc', {
key: 'daac25c1512fe50f79b0e4526b93f5c0e1460cef40b6dd44af13caec62e8c60e0d885f3c6d6fb51e530889e6fd4ac743a6d332e68a0f2a3923f42585dceb93e9', // 要求为 16 进制串或字节数组
})
```
## sm4
### 加密
```js
const sm4 = require('miniprogram-sm-crypto').sm4
const msg = 'hello world! 我是 juneandgreen.' // 可以为 utf8 串或字节数组
const key = '0123456789abcdeffedcba9876543210' // 可以为 16 进制串或字节数组,要求为 128 比特
let encryptData = sm4.encrypt(msg, key) // 加密,默认输出 16 进制字符串,默认使用 pkcs#7 填充(传 pkcs#5 也会走 pkcs#7 填充)
let encryptData = sm4.encrypt(msg, key, {padding: 'none'}) // 加密,不使用 padding
let encryptData = sm4.encrypt(msg, key, {padding: 'none', output: 'array'}) // 加密,不使用 padding,输出为字节数组
let encryptData = sm4.encrypt(msg, key, {mode: 'cbc', iv: 'fedcba98765432100123456789abcdef'}) // 加密,cbc 模式
```
### 解密
```js
const sm4 = require('miniprogram-sm-crypto').sm4
const encryptData = '0e395deb10f6e8a17e17823e1fd9bd98a1bff1df508b5b8a1efb79ec633d1bb129432ac1b74972dbe97bab04f024e89c' // 可以为 16 进制串或字节数组
const key = '0123456789abcdeffedcba9876543210' // 可以为 16 进制串或字节数组,要求为 128 比特
let decryptData = sm4.decrypt(encryptData, key) // 解密,默认输出 utf8 字符串,默认使用 pkcs#7 填充(传 pkcs#5 也会走 pkcs#7 填充)
let decryptData = sm4.decrypt(encryptData, key, {padding: 'none'}) // 解密,不使用 padding
let decryptData = sm4.decrypt(encryptData, key, {padding: 'none', output: 'array'}) // 解密,不使用 padding,输出为字节数组
let decryptData = sm4.decrypt(encryptData, key, {mode: 'cbc', iv: 'fedcba98765432100123456789abcdef'}) // 解密,cbc 模式
```
## 协议
MIT
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