gm-crypto


!密码行业标准化委员会

A pure JavaScript implementation of GM/T series cryptographic algorithms for Node.js and browsers.

- GM/T0003-2012《SM2 public key cryptographic algorithm based on elliptic curves》
- GM/T0004-2012《SM3 cryptographic hash algorithm》
- GM/T0002-2012《SM4 block cipher algorithm》(also aliased as SMS4)

Quick Start

$3

Using npm:

``bash
$ npm install gm-crypto
`

Using yarn:

`bash
$ yarn add gm-crypto
`

$3

#### 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

- .generateKeyPair() ⇒ object
- [.encrypt(data, key[, options]](#sm2encryptdata-key-options) ⇒ string | ArrayBuffer
- [.decrypt(data, key[, options])](#sm2decryptdata-key-options) ⇒ string | ArrayBuffer

- SM3

- [.digest(data[, inputEncoding][, outputEncoding])](#sm3digestdata-inputencoding-outputencoding) ⇒ string | ArrayBuffer

- SM4
- [.encrypt(data, key[, options])](#sm4encryptdata-key-options) ⇒ string | ArrayBuffer
- [.decrypt(data, key[, options])](#sm4decryptdata-key-options) ⇒ string | ArrayBuffer

$3

Generates a new asymmetric key pair.

$3

Encrypt data.

| Param | Type | Default | Description |
| ---------------------- | --------------------------------- | -------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| data | string\|ArrayBuffer\|Buffer | | Plain message |
| key | string | | Public key generated by SM2.generateKeyPair() |
| 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 is returned. |

$3

Decrypt data.

| Param | Type | Default | Description |
| ---------------------- | --------------------------------- | -------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| data | string\|ArrayBuffer\|Buffer | | Ciphered data |
| key | string | | Private key generated by SM2.generateKeyPair() |
| 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 is returned. |

$3

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 is returned. |

$3

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 is returned. |

$3

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 is returned. |