tree 1938f592931d6bc479f5f5f12b3753aecc118415
parent 1f4b258077e16ed8126c24e091b1fefc834a5402
author Silvestrs Timofejevs <silvestrst@lowrisc.org> 1612456173 +0000
committer Silvestrs Timofejevs <silvestrst@lowrisc.org> 1614847638 +0000

[sw, rom_ext_signer] Add signing and remaining image update API

- Retrieving exponent is work-in-progress, and at the moment
  dummy hardcoded vector of `0xA5` is used.
- Retrieving modulus is work-in-progress, and at the moment
  dummy hardcoded vector of `0xA5` is used.
- Peripheral Lockdown Info encodingis work in progress, and at
  the moment dummy hardcoded vector of `0xA5` is used.
- It is not clear yet how the device_usage_value is encoded in
  the 256-bit usage_constraints blob, and at the moment dummy
  hardcoded vector of `0xA5` is used.

This change adds image signing functionality through Mundane.

* There was some refactoring done, missing fields
  `extension{0,1,2,3}_offset` have been added.

* `image_length` is no longer passed in the config, as it is
  set automatically in the manifest assembly file.

* `image_timestamp` is no longer passed in the config, and is
  calculated at runtime.

Signed-off-by: Silvestrs Timofejevs <silvestrst@lowrisc.org>