| commit | 70d6ef8ba9093d818c0f545673e193bf95ceff61 | [log] [tgz] |
|---|---|---|
| author | Eunchan Kim <eunchan@opentitan.org> | Wed Apr 28 13:34:43 2021 -0700 |
| committer | Eunchan Kim <eunchan@opentitan.org> | Wed Apr 28 13:34:43 2021 -0700 |
| tree | e27b558516556f79294f9c7cb6437937cb421cbf | |
| parent | 828249b4003e0786e38392e94b1c1be0d96fb8aa [diff] |
[kmac] Prefix to be stable across App Op This is reported by @udinator (Issue #6345 ) KMAC only sends out the predefined hard-coded Prefix value in `StAppMsg` state. That state is short-lived state. FSM stays in that state only while it feeds the data into the MSG_FIFO. After recevied the last beat of the message and feeds into the MSG_FIFO, the state moves to the next state (either StAppOutLen or StAppProcess). If the message is short length, then even after state machine is moved to `AppProcess`, the SHA3 engine may not complete the PREFIX computation. Then, the prefix value is swapped to all zero value, which results in wrong digest value. This commit adds more state conditions in the prefix assignment block. Signed-off-by: Eunchan Kim <eunchan@opentitan.org>
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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