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doc: change AES-GCM IV recommendation in WebCrypto #42611

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Apr 12, 2022
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doc: change AES-GCM IV recommendation in WebCrypto #42611

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12 changes: 9 additions & 3 deletions doc/api/webcrypto.md
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Expand Up @@ -1019,9 +1019,14 @@ added: v15.0.0

* Type: {ArrayBuffer|TypedArray|DataView|Buffer}

The initialization vector must be unique for every encryption operation
using a given key. The AES-GCM specification recommends that
this contain at least 12 random bytes.
The initialization vector must be unique for every encryption operation using a
given key.

Ideally, this is a deterministic 12-byte value that is computed in such a way
that it is guaranteed to be unique across all invocations that use the same key.
Alternatively, the initialization vector may consist of at least 12
cryptographically random bytes. For more information on constructing
initialization vectors for AES-GCM, refer to Section 8 of [NIST SP 800-38D][].

#### `aesGcmParams.name`

Expand Down Expand Up @@ -1923,5 +1928,6 @@ added: v15.0.0

[JSON Web Key]: https://tools.ietf.org/html/rfc7517
[Key usages]: #cryptokeyusages
[NIST SP 800-38D]: https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38d.pdf
[RFC 4122]: https://www.rfc-editor.org/rfc/rfc4122.txt
[Web Crypto API]: https://www.w3.org/TR/WebCryptoAPI/