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36 lines
1.2 KiB
36 lines
1.2 KiB
2 years ago
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import {Cryptor} from './Cryptor'
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import {Awaitable, DecodedValue, EncodedValue} from '../types'
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import * as crypto from 'crypto'
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import { Buffer } from 'buffer'
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/**
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* AES 256 implementation of a Cryptor.
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*/
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export class AES256Cryptor extends Cryptor {
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encode(value: DecodedValue): Awaitable<EncodedValue> {
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const hash = crypto.createHash('sha256')
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hash.update(this.key)
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const vector = crypto.randomBytes(16)
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const cipher = crypto.createCipheriv('aes-256-ctr', hash.digest(), vector)
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const input = Buffer.from(value)
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const cipherText = cipher.update(input)
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const encoded = Buffer.concat([vector, cipherText, cipher.final()])
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return encoded.toString('base64')
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}
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decode(payload: EncodedValue): Awaitable<DecodedValue> {
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const hash = crypto.createHash('sha256')
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hash.update(this.key)
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const input = Buffer.from(payload, 'base64')
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const vector = input.slice(0, 16)
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const decipher = crypto.createDecipheriv('aes-256-ctr', hash.digest(), vector)
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const cipherText = input.slice(16)
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const decoded = Buffer.concat([decipher.update(cipherText), decipher.final()])
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return decoded.toString()
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}
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}
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