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size](https://packagephobia.com/badge?p=@ecies/ciphers)](https://packagephobia.com/result?p=@ecies/ciphers)\n[![CI](https://img.shields.io/github/actions/workflow/status/ecies/js-ciphers/ci.yml)](https://github.com/ecies/js-ciphers/actions)\n[![Codecov](https://img.shields.io/codecov/c/github/ecies/js-ciphers.svg)](https://codecov.io/gh/ecies/js-ciphers)\n\nNode/Pure JavaScript symmetric ciphers adapter.\n\nIf native implementations are available on some platforms (e.g. node, deno, bun), it'll use [`node:crypto`](https://nodejs.org/api/crypto.html#cryptocreatecipherivalgorithm-key-iv-options) for efficiency.\n\nOtherwise (e.g. browser, react native), it'll use [`@noble/ciphers`](https://github.com/paulmillr/noble-ciphers) for compatibility.\n\n|              | aes              | chacha           |\n| ------------ | ---------------- | ---------------- |\n| Node         | `node:crypto` ⚡ | `node:crypto` ⚡ |\n| Bun          | `node:crypto` ⚡ | `@noble/ciphers` |\n| Deno         | `node:crypto` ⚡ | `@noble/ciphers` |\n| Browser      | `@noble/ciphers` | `@noble/ciphers` |\n| React Native | `@noble/ciphers` | `@noble/ciphers` |\n\n> [!NOTE]\n> You may need to polyfill [`crypto.getRandomValues`](https://github.com/LinusU/react-native-get-random-values) for React Native.\n>\n> There are some limitations, see [Known limitations](#known-limitations) below.\n>\n> This library is tree-shakeable, unused code will be excluded by bundlers.\n\nCheck the [example](./example/) folder for more usages.\n\n## Quick start\n\n```js\n// example/quick-start.js\nimport { aes256gcm } from \"@ecies/ciphers/aes\";\nimport { randomBytes } from \"@noble/ciphers/webcrypto\";\n\nconst TEXT = \"hello world🌍!\";\nconst encoder = new TextEncoder();\nconst decoder = new TextDecoder();\nconst msg = encoder.encode(TEXT);\n\nconst key = randomBytes();\nconst nonce = randomBytes(16);\nconst cipher = aes256gcm(key, nonce);\nconsole.log(\"decrypted:\", decoder.decode(cipher.decrypt(cipher.encrypt(msg))));\n```\n\nThe API follows `@noble/ciphers`'s API for ease of use, you can check their [examples](https://github.com/paulmillr/noble-ciphers#examples) as well.\n\n## Supported ciphers\n\n- `aes-256-gcm`\n  - Both 16 bytes and 12 bytes nonce are supported.\n- `aes-256-cbc`\n  - **Only for legacy applications**. You should use `xchacha20-poly1305` or `aes-256-gcm` as possible.\n  - Nonce is always 16 bytes.\n- `chacha20-poly1305`\n  - Nonce is always 12 bytes.\n- `xchacha20-poly1305`\n  - Nonce is always 24 bytes.\n\nIf key is fixed and nonce is less than 16 bytes, **avoid randomly generated nonce**.\n\n## Known limitations\n\n- `xchacha20-poly1305` is implemented with pure JS [`hchacha20`](https://datatracker.ietf.org/doc/html/draft-irtf-cfrg-xchacha#section-2.2) function and `node:crypto`'s `chacha20-poly1305` on node.\n- Currently (Nov 2025), `node:crypto`'s `chacha20-poly1305` is neither supported on [deno](https://github.com/denoland/deno/issues/28411) nor [bun](https://github.com/oven-sh/bun/issues/8072), `@noble/ciphers`'s implementation is used on both platforms instead.\n- Some old versions of `deno` [did not support](https://github.com/denoland/deno/discussions/17964#discussioncomment-10917259) **indirect** conditional exports. If you used this library to build another library, client code of your library might have fell back to the `node:crypto` implementation and would not work properly, specifically `aes-256-gcm` (16 bytes nonce) and `chacha20-poly1305`. If you found such a problem, upgrade deno and run with `--conditions deno` (>=2.4.0) or `--unstable-node-conditions deno`(>=2.3.6,<2.4.0).\n","readmeFilename":"README.md"}