npm package: @fanthos/gm-crypto
Description: An implementation of GM/T industry standards
Author: panjizhi1987@gmail.com
Latest version: 0.1.7

# gm-crypto

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![密码行业标准化委员会](./spec_header.png)

A pure JavaScript implementation of GM/T series cryptographic algorithms for Node.js and browsers, with type declaration files support.

- [GM/T0003-2012《SM2 public key cryptographic algorithm based on elliptic curves》](http://www.oscca.gov.cn/sca/xxgk/2010-12/17/content_1002386.shtml)
- [GM/T0004-2012《SM3 cryptographic hash algorithm》](https://www.oscca.gov.cn/sca/xxgk/2010-12/17/content_1002389.shtml)
- [GM/T0002-2012《SM4 block cipher algorithm》(also aliased as SMS4)](http://www.sca.gov.cn/sca/c100061/201611/1002423/files/330480f731f64e1ea75138211ea0dc27.pdf)

## Quick Start

### Install

Using npm:

```bash
$ npm install gm-crypto
```

Using yarn:

```bash
$ yarn add gm-crypto
```

### Basic Usage

#### SM2

> Public Key Cryptographic Algorithm Based on Elliptic Curves.

```js
const { SM2 } = require('gm-crypto')

const { publicKey, privateKey } = SM2.generateKeyPair()
const originalData = 'SM2 椭圆曲线公钥密码算法'

const encryptedData = SM2.encrypt(originalData, publicKey, {
  inputEncoding: 'utf8',
  outputEncoding: 'base64'
})

const decryptedData = SM2.decrypt(encryptedData, privateKey, {
  inputEncoding: 'base64',
  outputEncoding: 'utf8'
})
```

#### SM3

> Cryptographic Hash Algorithm.

```js
const { SM3 } = require('gm-crypto')

console.log(SM3.digest('abc'))
console.log(SM3.digest('YWJj', 'base64'))
console.log(SM3.digest('616263', 'hex', 'base64'))
```

#### SM4

> Block Cipher Algorithm.

```js
const { SM4 } = require('gm-crypto')

const key = '0123456789abcdeffedcba9876543210' // Any string of 32 hexadecimal digits
const originalData = 'SM4 国标对称加密'

/**
 * Block cipher modes:
 * - ECB: electronic codebook
 * - CBC: cipher block chaining
 */

let encryptedData, decryptedData

// ECB
encryptedData = SM4.encrypt(originalData, key, {
  inputEncoding: 'utf8',
  outputEncoding: 'base64'
})
decryptedData = SM4.decrypt(encryptedData, key, {
  inputEncoding: 'base64',
  outputEncoding: 'utf8'
})

// CBC
const iv = '0123456789abcdeffedcba9876543210' // Initialization vector(any string of 32 hexadecimal digits)
encryptedData = SM4.encrypt(originalData, key, {
  iv,
  mode: SM2.constants.CBC,
  inputEncoding: 'utf8',
  outputEncoding: 'hex'
})
decryptedData = SM4.decrypt(encryptedData, key, {
  iv,
  mode: SM2.constants.CBC,
  inputEncoding: 'hex',
  outputEncoding: 'utf8'
})
```

## API

- [SM2](#api)

  - [.generateKeyPair()](#sm2generatekeypair) ⇒ `object`
  - [.encrypt(data, key[, options]](#sm2encryptdata-key-options) ⇒ `string` | `ArrayBuffer`
  - [.decrypt(data, key[, options])](#sm2decryptdata-key-options) ⇒ `string` | `ArrayBuffer`

- [SM3](#api)

  - [.digest(data[, inputEncoding][, outputEncoding])](#sm3digestdata-inputencoding-outputencoding) ⇒ `string` | `ArrayBuffer`

- [SM4](#api)
  - [.encrypt(data, key[, options])](#sm4encryptdata-key-options) ⇒ `string` | `ArrayBuffer`
  - [.decrypt(data, key[, options])](#sm4decryptdata-key-options) ⇒ `string` | `ArrayBuffer`

### SM2.generateKeyPair()

Generates a new asymmetric key pair.

### SM2.encrypt(data, key[, options])

Encrypt data.

| Param                  | Type                              | Default  | Description                                                                                                                                                                                      |
| ---------------------- | --------------------------------- | -------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| data                   | `string`\|`ArrayBuffer`\|`Buffer` |          | Plain message                                                                                                                                                                                    |
| key                    | `string`                          |          | Public key generated by [SM2.generateKeyPair()](#sm2generatekeypair)                                                                                                                             |
| options                | `object`                          |          | Options                                                                                                                                                                                          |
| options.mode           | `C1C3C2` \| `C1C2C3`              | `C1C3C2` | Concatenation mode                                                                                                                                                                               |
| options.inputEncoding  | `string`                          | `"utf8"` | The encoding of the plain `data` string,if `data` is not a string then `inputEncoding` is ignored.                                                                                               |
| options.outputEncoding | `string`                          |          | If `outputEncoding` is provided, a string will be returned, otherwise a [ArrayBuffer](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer) is returned. |

### SM2.decrypt(data, key[, options])

Decrypt data.

| Param                  | Type                              | Default  | Description                                                                                                                                                                                      |
| ---------------------- | --------------------------------- | -------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| data                   | `string`\|`ArrayBuffer`\|`Buffer` |          | Ciphered data                                                                                                                                                                                    |
| key                    | `string`                          |          | Private key generated by [SM2.generateKeyPair()](#sm2generatekeypair)                                                                                                                            |
| options.mode           | `C1C3C2` \| `C1C2C3`              | `C1C3C2` | Concatenation mode                                                                                                                                                                               |
| options.inputEncoding  | `string`                          |          | The encoding of the plain `data` string,if `data` is not a string then `inputEncoding` is ignored.                                                                                               |
| options.outputEncoding | `string`                          |          | If `outputEncoding` is provided, a string will be returned, otherwise a [ArrayBuffer](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer) is returned. |

### SM3.digest(data, [inputEncoding], [outputEncoding])

Calculates the digest.

| Param          | Type                              | Default  | Description                                                                                                                                                                                      |
| -------------- | --------------------------------- | -------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| data           | `string`\|`ArrayBuffer`\|`Buffer` |          | Data message                                                                                                                                                                                     |
| inputEncoding  | `string`                          | `"utf8"` | The encoding of the `data` string, if `data` is not a string then `inputEncoding` is ignored.                                                                                                    |
| outputEncoding | `string`                          |          | If `outputEncoding` is provided, a string will be returned, otherwise a [ArrayBuffer](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer) is returned. |

### SM4.encrypt(data, key[, options])

Encrypt data.

| Param                  | Type                              | Default  | Description                                                                                                                                                                                      |
| ---------------------- | --------------------------------- | -------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| data                   | `string`\|`ArrayBuffer`\|`Buffer` |          | Plain message                                                                                                                                                                                    |
| key                    | `string`                          |          | Cipher key(any string of 32 hexadecimal digits)                                                                                                                                                  |
| options                | `object`                          |          | Options                                                                                                                                                                                          |
| options.mode           | `ECB` \| `CBC`                    | `ECB`    | Block cipher mode                                                                                                                                                                                |
| options.iv             | `string`                          |          | Initialization vector(any string of 32 hexadecimal digits)                                                                                                                                       |
| options.inputEncoding  | `string`                          | `"utf8"` | The encoding of the plain `data` string,if `data` is not a string then `inputEncoding` is ignored.                                                                                               |
| options.outputEncoding | `string`                          |          | If `outputEncoding` is provided, a string will be returned, otherwise a [ArrayBuffer](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer) is returned. |

### SM4.decrypt(data, key[, options])

Decrypt data.

| Param                  | Type                              | Default | Description                                                                                                                                                                                      |
| ---------------------- | --------------------------------- | ------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| data                   | `string`\|`ArrayBuffer`\|`Buffer` |         | Ciphered data                                                                                                                                                                                    |
| key                    | `string`                          |         | Cipher key(any string of 32 hexadecimal digits)                                                                                                                                                  |
| options                | `object`                          |         | Options                                                                                                                                                                                          |
| options.mode           | `ECB` \| `CBC`                    | `ECB`   | Block cipher mode                                                                                                                                                                                |
| options.iv             | `string`                          |         | Initialization vector(any string of 32 hexadecimal digits)                                                                                                                                       |
| options.inputEncoding  | `string`                          |         | The encoding of the plain `data` string,if `data` is not a string then `inputEncoding` is ignored.                                                                                               |
| options.outputEncoding | `string`                          |         | If `outputEncoding` is provided, a string will be returned, otherwise a [ArrayBuffer](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer) is returned. |