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example-ipfs.mjs
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example-ipfs.mjs
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import { randomBytes } from '@stablelib/random'
import { generateKeyPairFromSeed } from '@stablelib/x25519'
// IPLD & IPFS
import { create as createIpfs } from 'ipfs'
import { convert as toLegacyIpld } from 'blockcodec-to-ipld-format'
// JWT & utilities
import {
xc20pDirEncrypter,
xc20pDirDecrypter,
x25519Encrypter,
x25519Decrypter,
decryptJWE,
createJWE
} from 'did-jwt'
import {
decodeCleartext,
prepareCleartext
} from 'dag-jose-utils'
import * as dagJose from './lib/index.js'
// Translate DAG-JOSE into the IPLD interface js-IPFS understands
const dagJoseIpldFormat = toLegacyIpld(dagJose)
let ipfs
// Async setup tasks
async function setup () {
console.log('Starting IPFS ...')
// Instantiate an IPFS node, that knows how to deal with DAG-JOSE blocks
ipfs = await createIpfs({ ipld: { formats: [dagJoseIpldFormat] } })
}
async function symmetric () {
// Encrypt and store a payload using a secret key
const storeEncrypted = async (payload, key) => {
const dirEncrypter = xc20pDirEncrypter(key)
// prepares a cleartext object to be encrypted in a JWE
const cleartext = await prepareCleartext(payload)
// encrypt into JWE container layout using secret key
const jwe = await createJWE(cleartext, [dirEncrypter])
// let IPFS store the bytes using the DAG-JOSE codec and return a CID
const cid = await ipfs.dag.put(jwe, { format: dagJoseIpldFormat.codec, hashAlg: 'sha2-256' })
console.log(`Encrypted block CID: \u001b[32m${cid}\u001b[39m`)
return cid
}
// Load an encrypted block from a CID and decrypt the payload using a secret key
const loadEncrypted = async (cid, key) => {
const dirDecrypter = xc20pDirDecrypter(key)
const retrieved = await ipfs.dag.get(cid)
const decryptedData = await decryptJWE(retrieved.value, dirDecrypter)
return decodeCleartext(decryptedData)
}
const key = randomBytes(32)
const secretz = { my: 'secret message' }
console.log('Encrypting and storing secret:\u001b[1m', secretz, '\u001b[22m')
const cid = await storeEncrypted(secretz, key)
const decoded = await loadEncrypted(cid, key)
console.log('Loaded and decrypted block content:\u001b[1m', decoded, '\u001b[22m')
}
// Asymmetric encryption using a private and public key
async function asymmetric () {
// Encrypt and store a payload using a public key
const storeEncrypted = async (payload, pubkey) => {
const asymEncrypter = x25519Encrypter(pubkey)
// prepares a cleartext object to be encrypted in a JWE
const cleartext = await prepareCleartext(payload)
// encrypt into JWE container layout using public key
const jwe = await createJWE(cleartext, [asymEncrypter])
// let IPFS store the bytes using the DAG-JOSE codec and return a CID
const cid = await ipfs.dag.put(jwe, { format: dagJoseIpldFormat.codec, hashAlg: 'sha2-256' })
console.log(`Encrypted block CID: \u001b[32m${cid}\u001b[39m`)
return cid
}
// Load an encrypted block from a CID and decrypt the payload using a secret key
const loadEncrypted = async (cid, privkey) => {
const asymDecrypter = x25519Decrypter(privkey)
// decode the DAG-JOSE envelope
const retrieved = await ipfs.dag.get(cid)
const decryptedData = await decryptJWE(retrieved.value, asymDecrypter)
return decodeCleartext(decryptedData)
}
const privkey = randomBytes(32)
// generate a public key from the existing private key
const pubkey = generateKeyPairFromSeed(privkey).publicKey
const secretz = { my: 'secret message' }
console.log('Encrypting and storing secret with public key:\u001b[1m', secretz, '\u001b[22m')
const cid = await storeEncrypted(secretz, pubkey)
const decoded = await loadEncrypted(cid, privkey)
console.log('Loaded and decrypted block content with private key:\u001b[1m', decoded, '\u001b[22m')
}
// Run!
setup().then(() => {
console.log('Running symmetric example...')
symmetric().then(async () => {
console.log('Running asymmetric example...')
await asymmetric()
process.exit(0)
})
}).catch((e) => {
console.error(e.stack)
process.exit(1)
})