Gilles Peskine 159171b72a PK parse/write: support keylen=0 correctly ...

A 0-length buffer for the key is a legitimate edge case. Ensure that
it works, even with buf=NULL. Document the key and keylen parameters.

There are already test cases for parsing an empty buffer. A subsequent
commit will add tests for writing to an empty buffer.

2018-12-19 17:03:28 +01:00

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