`crypto.createCipheriv` is not implemented yet!

[rawand-faraidun]

I am trying to encrypt a value, and it works locally, but on Cloudflare Pages functions, i get this error:

[unenv] crypto.createCipheriv is not implemented yet!

These are my configs and implementation:

// package.json

{
  "name": "test-worker",
  "description": "test-worker",
  "version": "0.0.0",
  "private": true,
  ...
  "devDependencies": {
    "@cloudflare/workers-types": "^4.20250715.0",
    "@types/node": "^24.0.13",
    "typescript": "^5.8.3",
    "wrangler": "^4.24.3",
    ...
  },
  ...
}

// wrangler.jsonc

{
  "$schema": "./node_modules/wrangler/config-schema.json",
  "name": "test-worker",
  "compatibility_date": "2025-04-01",
  "pages_build_output_dir": "./assets",
  "compatibility_flags": ["nodejs_compat"],
  "observability": {
    "enabled": true
  }
}

// typescript implementation

import { createCipheriv, randomBytes } from 'node:crypto'

...

const iv = randomBytes(12)
const key = Buffer.from(env.AES_KEY, 'utf8')
const cipher = createCipheriv('aes-256-gcm', key, iv)
const encrypt = Buffer.concat([cipher.update(value, 'utf-8'), cipher.final()])
const authTag = cipher.getAuthTag()
const encrypted = Buffer.concat([iv, authTag, encrypt]).toString('base64')

...

[jasnell]

I believe that Pages may still be injecting the unenv polyfill (https://github.com/cloudflare/workers-sdk/blob/main/packages/unenv-preset/src/preset.ts)

@cloudflare/wrangler @vicb ... the preset might need to be updated.

[rawand-faraidun]

I believe that Pages may still be injecting the unenv polyfill (https://github.com/cloudflare/workers-sdk/blob/main/packages/unenv-preset/src/preset.ts)

@cloudflare/wrangler @vicb ... the preset might need to be updated.

do you think there is an update comming for it or should i implement it using crypto.subtle.encrypt, or any better idea?

[jasnell]

I'm not sure about the timing on an update. Let's see what the wrangler team folks say.

[rawand-faraidun]

I'm not sure about the timing on an update. Let's see what the wrangler team folks say.

thank you

[vicb]

I believe that Pages may still be injecting the unenv polyfill (https://github.com/cloudflare/workers-sdk/blob/main/packages/unenv-preset/src/preset.ts)

@cloudflare/wrangler @vicb ... the preset might need to be updated.

I believe Pages uses an older version of wrangler (updated once every few months).

@rawand-faraidun any chance you can migrate to Workers instead?