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doc,lib,test: rename HKDF 'key' argument #39474

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doc,lib,test: rename HKDF 'key' argument #39474

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@tniessen tniessen commented Jul 20, 2021

HKDF is a key derivation function, which, as the name implies, can be used to produce a key. However, the input is usually not a cryptographic key. (Internally, HKDF passes the "key" to HMAC, but not as a key, but as data to be hashed. The salt argument is actually used as the key internally.)

To avoid confusion and the ambiguity of having two (or three) "keys" (input keying material and output keying material, and internally the pseudorandom key), this renames the argument in documentation and error messages.

I'd be happy about alternatives to the name ikm, which is not exactly self-explanatory. Is inputKeyingMaterial (or inputKeyMaterial) too verbose?

Refs: #39471

@tniessen tniessen added the crypto Issues and PRs related to the crypto subsystem. label Jul 20, 2021
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@tniessen tniessen added the request-ci Add this label to start a Jenkins CI on a PR. label Jul 21, 2021
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nodejs-github-bot commented Jul 21, 2021

CI: https://ci.nodejs.org/job/node-test-pull-request/39203/

@panva panva added author ready PRs that have at least one approval, no pending requests for changes, and a CI started. and removed needs-ci PRs that need a full CI run. labels Jul 21, 2021
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nodejs-github-bot commented Jul 22, 2021

CI: https://ci.nodejs.org/job/node-test-pull-request/39211/

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jasnell commented Jul 26, 2021

Landed in 1229d49

@jasnell jasnell closed this Jul 26, 2021
jasnell pushed a commit that referenced this pull request Jul 26, 2021
@tniessen @jasnell
doc,lib,test: rename HKDF 'key' argument
1229d49 
PR-URL: #39474
Refs: #39471
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Zeyu Yang <himself65@outlook.com>
Reviewed-By: Filip Skokan <panva.ip@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
targos pushed a commit that referenced this pull request Aug 2, 2021
@tniessen @targos
doc,lib,test: rename HKDF 'key' argument
7a731ef 
PR-URL: #39474
Refs: #39471
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Zeyu Yang <himself65@outlook.com>
Reviewed-By: Filip Skokan <panva.ip@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
@targos targos mentioned this pull request Aug 2, 2021
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@tniessen tniessen deleted the doc-rename-hkdf-key-arg branch October 7, 2021 16:44
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@lpinca lpinca lpinca approved these changes

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