sm2.js
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/* eslint-disable no-bitwise, no-mixed-operators, class-methods-use-this */
const {BigInteger} = require('jsbn')
const SM3Digest = require('./sm3')
const _ = require('./utils')
class SM2Cipher {
constructor() {
this.ct = 1
this.p2 = null
this.sm3keybase = null
this.sm3c3 = null
this.key = new Array(32)
this.keyOff = 0
}
reset() {
this.sm3keybase = new SM3Digest()
this.sm3c3 = new SM3Digest()
const xWords = _.hexToArray(this.p2.getX().toBigInteger().toRadix(16))
const yWords = _.hexToArray(this.p2.getY().toBigInteger().toRadix(16))
this.sm3keybase.blockUpdate(xWords, 0, xWords.length)
this.sm3c3.blockUpdate(xWords, 0, xWords.length)
this.sm3keybase.blockUpdate(yWords, 0, yWords.length)
this.ct = 1
this.nextKey()
}
nextKey() {
const sm3keycur = new SM3Digest(this.sm3keybase)
sm3keycur.update((this.ct >> 24 & 0x00ff))
sm3keycur.update((this.ct >> 16 & 0x00ff))
sm3keycur.update((this.ct >> 8 & 0x00ff))
sm3keycur.update((this.ct & 0x00ff))
sm3keycur.doFinal(this.key, 0)
this.keyOff = 0
this.ct++
}
initEncipher(userKey) {
const keypair = _.generateKeyPairHex()
const k = new BigInteger(keypair.privateKey, 16)
let publicKey = keypair.publicKey
this.p2 = userKey.multiply(k) // [k](Pb)
this.reset()
if (publicKey.length > 128) {
publicKey = publicKey.substr(publicKey.length - 128)
}
return publicKey
}
encryptBlock(data) {
this.sm3c3.blockUpdate(data, 0, data.length)
for (let i = 0; i < data.length; i++) {
if (this.keyOff === this.key.length) {
this.nextKey()
}
data[i] ^= this.key[this.keyOff++] & 0xff
}
}
initDecipher(userD, c1) {
this.p2 = c1.multiply(userD)
this.reset()
}
decryptBlock(data) {
for (let i = 0; i < data.length; i++) {
if (this.keyOff === this.key.length) {
this.nextKey()
}
data[i] ^= this.key[this.keyOff++] & 0xff
}
this.sm3c3.blockUpdate(data, 0, data.length)
}
doFinal(c3) {
const yWords = _.hexToArray(this.p2.getY().toBigInteger().toRadix(16))
this.sm3c3.blockUpdate(yWords, 0, yWords.length)
this.sm3c3.doFinal(c3, 0)
this.reset()
}
createPoint(x, y) {
const publicKey = '04' + x + y
const point = _.getGlobalCurve().decodePointHex(publicKey)
return point
}
}
module.exports = SM2Cipher