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feat!: make RSA keys ephemeral by default
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BREAKING CHANGE: keyDir now defaults to null (ephemeral) instead of
'client_keys'. Clients that relied on keys persisting across restarts
must now pass keyDir explicitly.

The Python SDK defaults to key_dir=None: a key pair is generated in
memory for the session and never written to disk. The JS port defaulted
to 'client_keys' and always persisted, so merely constructing a client
wrote an RSA private key into the working directory. That is a weaker
default than the client it ports, and one users never asked for.

  - keyDir?: string | null, defaulting to undefined. null and undefined
    both mean ephemeral, matching Python's None.
  - Persistent mode is unchanged when keyDir is set: load the existing
    pair from that directory, otherwise generate and save one there.
  - Browsers are always ephemeral; they have no filesystem.

Key rotation follows the same rule. It previously hardcoded
'client_keys' as its fallback directory, so an ephemeral client would
have started writing private keys to disk on the first rotation tick.
Rotated keys are now persisted only where keyDir or keyRotationDir is
explicitly configured.

Tests assert the intent (that saveKeys is never called) rather than
probing the filesystem, since a leftover client_keys/ from the old
default would otherwise make them pass or fail for the wrong reason.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Alpha Nerd 2026-07-19 11:19:03 +02:00
parent 2495f1e6e8
commit 987acf8816
Signed by: alpha-nerd
SSH key fingerprint: SHA256:QkkAgVoYi9TQ0UKPkiKSfnerZy2h4qhi3SVPXJmBN+M
7 changed files with 260 additions and 39 deletions
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doc/api-reference.md
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@ -21,9 +21,9 @@ new SecureChatCompletion(config?: ChatCompletionConfig)
| `secureMemory` | `boolean` | `true` | Enable immediate zeroing of sensitive buffers after use. |
| `timeout` | `number` | `60000` | Request timeout in milliseconds. |
| `debug` | `boolean` | `false` | Print verbose logging to the console. |
| `keyDir` | `string` | `'client_keys'` | Directory to load/save RSA keys on startup. If the directory contains an existing key pair it is loaded; otherwise a new pair is generated and saved there. Node.js only. |
| `keyDir` | `string \| null` | `null` | Directory to load/save RSA keys on startup. If the directory contains an existing key pair it is loaded; otherwise a new pair is generated and saved there. Omit (or pass `null`) for ephemeral keys generated in memory for this session only and never written to disk — this is the default, matching the Python SDK. Node.js only; browsers are always ephemeral. |
| `keyRotationInterval` | `number` | `86400000` (24 h) | Auto-rotate RSA keys every N milliseconds. Set to`0` to disable. |
| `keyRotationDir` | `string` | `'client_keys'` | Directory where rotated key files are saved. Node.js only. |
| `keyRotationDir` | `string` | value of `keyDir` | Directory where rotated key files are saved. When neither this nor `keyDir` is set, rotated keys stay in memory. Node.js only. |
| `keyRotationPassword` | `string` | `undefined` | Password used to encrypt rotated key files. |
| `maxRetries` | `number` | `2` | Maximum extra attempts on retryable errors (429, 500, 502, 503, 504, network errors). Uses exponential backoff (1 s, 2 s, …). Set to`0` to disable retries. |