HMAC K' definition

[ssamt]

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Question

K' is defined as K when |K| <= N. But since we need to XOR, it should be block size.

Does this mean we should pad K with zeros to get K'? Would that be left pad or right pad?

[leehahoon]

안녕하세요, |K|< N인 경우, ZeroPad를 이용해서 길이를 맞춰주시면 됩니다. (right pad)
자세한 내용은 해당 공지글을 참고하시면 도움이 되실 것 같습니다.

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Hello,
If |K| < N, please use ZeroPad (right padding) to match the length.
For more details, please refer to the announcement.