| commit | 24f2a9140d04a10c87fbc1f059aa69a9d661fb20 | [log] [tgz] |
|---|---|---|
| author | Felix Miller <felix.miller@gi-de.com> | Tue Sep 08 21:21:07 2020 +0200 |
| committer | Philipp Wagner <mail@philipp-wagner.com> | Wed Sep 09 14:16:55 2020 +0200 |
| tree | f1e223665bba3347d7b099e5a30721a0feac951d | |
| parent | 36dd48a33bbc8b9fd854c0cfbca19953db7c0f04 [diff] |
[otbn] fix specification of bn.subm instruction With the `bn.addm` instruction the result is expected to be in the range of `0` to `MOD-1` even if the non-modular result is only in the range of `0` to `2*MOD-1`. For this, in case the result is greater or equal `MOD` it needs to be corrected by subtracting `MOD` once. So far we had the same defintion for `bn.subm` which is wrong. Here, the non-modular result is tolerable in the range of `-MOD+1` to `MOD-1`. In case it is smaller than 0 it needs to be corrected by adding the result to `MOD` such that the final result is also between `0` and `MOD-1`. Signed-off-by: Felix Miller <felix.miller@gi-de.com>
OpenTitan is an open source silicon Root of Trust (RoT) project. OpenTitan will make the silicon RoT design and implementation more transparent, trustworthy, and secure for enterprises, platform providers, and chip manufacturers. OpenTitan is administered by lowRISC CIC as a collaborative project to produce high quality, open IP for instantiation as a full-featured product. See the OpenTitan site and OpenTitan docs for more information about the project.
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