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crypto.js
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crypto.js
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const sigUtil = require('eth-sig-util')
const utils = sigUtil.TypedDataUtils
const ethUtil = require('ethereumjs-util')
const clone = require('clone-deep')
const cryptoRandomString = require('crypto-random-string');
class Crypto {
constructor (key, domainTypes) {
this.key = key
this.privateKey = ethUtil.toBuffer(key.privateKey)
this.domainTypes = domainTypes
}
async seal (api) {
throw new Error('please implement')
}
async unseal (message) {
throw new Error('please implement')
}
async authenticate (message) {
if (message.message.action) {
return this.authenticateAction(message)
} else {
return this.authenticateCapability(message)
}
}
async authenticateCapability (obj) {
const bundle = clone(this.domainTypes.capability)
const sig = obj.signature.signatureValue
bundle.message = obj.message
const opts = { data: bundle, sig }
return sigUtil.recoverTypedSignature(opts)
}
async authenticateAction (obj) {
const bundle = clone(this.domainTypes.action)
const sig = obj.signature.signatureValue
bundle.message = obj.message
const opts = { data: bundle, sig }
return sigUtil.recoverTypedSignature(opts)
}
async sign ( message ) {
if (message.action) {
return this.signAction(message)
} else {
return this.signCapability(message)
}
}
async signCapability (message) {
const bundle = clone(this.domainTypes.capability)
bundle.message = message
const sig = sigUtil.signTypedData(this.privateKey, { data: bundle })
bundle.signature = {
type: 'capnode-v1',
proofPurpose: 'capabilityDelegation',
created: Date.now(),
creator: this.key.address,
signatureValue: sig,
}
return bundle
}
async signAction (message) {
const bundle = clone(this.domainTypes.action)
message.id = cryptoRandomString(20)
bundle.message = message
const sig = sigUtil.signTypedData(this.privateKey, { data: bundle })
bundle.signature = {
type: 'capnode-v1',
proofPurpose: 'capabilityDelegation',
created: Date.now(),
creator: this.key.address,
signatureValue: sig,
}
return bundle
}
async random () {
return cryptoRandomString()
}
}
module.exports = Crypto