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refactor(core): Migrate from crypto-js to native crypto (#7556)
[`crypto-js` has been discontinued](brix/crypto-js@1da3dab) PS: We'll remove `crypto-js` usage from `n8n-workflow` and `@n8n_io/license-sdk` in separate PRs.
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Original file line number | Diff line number | Diff line change |
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@@ -1,21 +1,43 @@ | ||
import { Service } from 'typedi'; | ||
import { AES, enc } from 'crypto-js'; | ||
import { createHash, createCipheriv, createDecipheriv, randomBytes } from 'crypto'; | ||
import { InstanceSettings } from './InstanceSettings'; | ||
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// Data encrypted by CryptoJS always starts with these bytes | ||
const RANDOM_BYTES = Buffer.from('53616c7465645f5f', 'hex'); | ||
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@Service() | ||
export class Cipher { | ||
constructor(private readonly instanceSettings: InstanceSettings) {} | ||
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encrypt(data: string | object) { | ||
const { encryptionKey } = this.instanceSettings; | ||
return AES.encrypt( | ||
typeof data === 'string' ? data : JSON.stringify(data), | ||
encryptionKey, | ||
).toString(); | ||
const salt = randomBytes(8); | ||
const [key, iv] = this.getKeyAndIv(salt); | ||
const cipher = createCipheriv('aes-256-cbc', key, iv); | ||
const encrypted = cipher.update(typeof data === 'string' ? data : JSON.stringify(data)); | ||
return Buffer.concat([RANDOM_BYTES, salt, encrypted, cipher.final()]).toString('base64'); | ||
} | ||
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decrypt(data: string) { | ||
const input = Buffer.from(data, 'base64'); | ||
if (input.length < 16) return ''; | ||
const salt = input.subarray(8, 16); | ||
const [key, iv] = this.getKeyAndIv(salt); | ||
const contents = input.subarray(16); | ||
const decipher = createDecipheriv('aes-256-cbc', key, iv); | ||
return Buffer.concat([decipher.update(contents), decipher.final()]).toString('utf-8'); | ||
} | ||
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private getKeyAndIv(salt: Buffer): [Buffer, Buffer] { | ||
const { encryptionKey } = this.instanceSettings; | ||
return AES.decrypt(data, encryptionKey).toString(enc.Utf8); | ||
const password = Buffer.concat([Buffer.from(encryptionKey, 'binary'), salt]); | ||
const hash1 = createHash('md5').update(password).digest(); | ||
const hash2 = createHash('md5') | ||
.update(Buffer.concat([hash1, password])) | ||
.digest(); | ||
const iv = createHash('md5') | ||
.update(Buffer.concat([hash2, password])) | ||
.digest(); | ||
const key = Buffer.concat([hash1, hash2]); | ||
return [key, iv]; | ||
} | ||
} |
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