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doc: document the length requirements of output parameter.

Description

doc: document the length requirements of output parameter.

Summary:
It's subtle, since it is actually only touched by hashfp (though
we assert it's non-NULL), but give explicit advice in the default
case.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

This is a backport of libsecp256k1 PR714.

Test Plan:

ninja check-secp256k1

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D5389

Details

Provenance
Rusty Russell <rusty@rustcorp.com.au>Authored on Feb 10 2020, 00:41
deadalnixCommitted on Mar 2 2020, 15:14
deadalnixPushed on Mar 2 2020, 15:14
Reviewer
Restricted Project
Differential Revision
D5389: doc: document the length requirements of output parameter.
Parents
rABC400ffebd985d: variable signing precompute table
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