bifcore-sdk-nodejs-bop/lib/keypair/vendor/crypto.js

bifcore sdk nodejs

'use strict'
const sjcl = require('brdc-sjcl')
const CryptoJS = require('crypto-js')
const crypto = {}
// const SCRYPT_PARAMS_COST_FACTOR = 16384
// const SCRYPT_PARAMS_BLOCK_SIZE_FACTOR = 8
// const SCRYPT_PARAMS_PARALLELIZATION_FACTOR = 1
// const SCRYPT_PARAMS_DK_LEN = 32
crypto.scryptParams = {
    SCRYPT_PARAMS_COST_FACTOR: 16384,
    SCRYPT_PARAMS_BLOCK_SIZE_FACTOR: 8,
    SCRYPT_PARAMS_PARALLELIZATION_FACTOR: 1,
    SCRYPT_PARAMS_DK_LEN: 32
}

crypto.encrypt = (password, origin) => {
    const n = crypto.scryptParams.SCRYPT_PARAMS_COST_FACTOR
    const r = crypto.scryptParams.SCRYPT_PARAMS_BLOCK_SIZE_FACTOR
    const p = crypto.scryptParams.SCRYPT_PARAMS_PARALLELIZATION_FACTOR
    const dkLen = crypto.scryptParams.SCRYPT_PARAMS_DK_LEN
    let saltBits = sjcl.random.randomWords(8)
    let ivBits = sjcl.random.randomWords(4)
    const dk = sjcl.misc.scrypt(password, saltBits, n, r, p, dkLen * 8)
    const iv1 = CryptoJS.enc.Hex.parse(sjcl.codec.hex.fromBits(ivBits)) // bitarry => hex => CryptoJS
    const derivedKey = CryptoJS.enc.Hex.parse(sjcl.codec.hex.fromBits(dk))// bitarry => hex => CryptoJS
    let encrypted1 = CryptoJS.AES.encrypt(origin, derivedKey, {
        iv: iv1,
        mode: CryptoJS.mode.CTR,
        padding: CryptoJS.pad.NoPadding
    })

    let cryptoData = {
        encrypted: encrypted1.ciphertext.toString(),
        iv: sjcl.codec.hex.fromBits(ivBits),
        salt: sjcl.codec.hex.fromBits(saltBits)
    }
    return cryptoData
}

crypto.decrypt = (password, keystoreContent) => {
    if (!keystoreContent) {
        throw new Error('require keystore')
    }
    if (!password) {
        throw new Error('require password')
    }
    if (typeof keystoreContent === 'string') {
        keystoreContent = JSON.parse(keystoreContent)
    }
    const n = crypto.scryptParams.SCRYPT_PARAMS_COST_FACTOR
    const r = crypto.scryptParams.SCRYPT_PARAMS_BLOCK_SIZE_FACTOR
    const p = crypto.scryptParams.SCRYPT_PARAMS_PARALLELIZATION_FACTOR
    const dkLen = crypto.scryptParams.SCRYPT_PARAMS_DK_LEN
    let cypherText = {}
    cypherText.ciphertext = CryptoJS.enc.Hex.parse(keystoreContent.cypher_text)
    let saltBits = sjcl.codec.hex.toBits(keystoreContent.scrypt_params.salt)
    const dk = sjcl.misc.scrypt(password, saltBits, n, r, p, dkLen * 8)
    const derivedKey = CryptoJS.enc.Hex.parse(sjcl.codec.hex.fromBits(dk))
    let decrypted = CryptoJS.AES.decrypt(cypherText, derivedKey, {
        mode: CryptoJS.mode.CTR,
        iv: CryptoJS.enc.Hex.parse(keystoreContent.aesctr_iv),
        padding: CryptoJS.pad.NoPadding
    })
    let respData = null
    try {
        respData = decrypted.toString(CryptoJS.enc.Utf8)
    } catch (e) {
    }
    return respData

}
module.exports = crypto