Disable the Zephyr-provided Tinycrypt, and use our local copy. This
avoids problems with changing version across different Zephyr releases.
Signed-off-by: David Brown <david.brown@linaro.org>
Since we are changing the image header format, there is no reason to
continue to support the old PKCS#1 v1.5 signatures. Remove the
definitions, and conditional complication related to this, and only
support the newer PSS signatures.
Signed-off-by: Marko Kiiskila <marko@runtime.io>
Signed-off-by: David Brown <david.brown@linaro.org>
Add a typedef which lets us use flash_sector or flash_area to contain
the sectors within the boot_data global. When
MCUBOOT_USE_FLASH_AREA_GET_SECTORS is defined, this is struct
flash_sector.
Also add struct boot_loader_state accessors to handle this case, and
make the appropriate changes to where the sectors are allocated to use
the new typedef.
Finally, ensure MCUBOOT_USE_FLASH_AREA_GET_SECTORS is defined in the
Zephyr Makefile, since flash_area_get_sectors() is already provided
there.
This lets mcuboot users convert to the new flash API gradually.
Signed-off-by: Marti Bolivar <marti.bolivar@linaro.org>
The PKCS#1 standards, which define RSA signatures, are currently at
version 2.2. Starting in v2.1, the standard defines a new signature
method RSA-PSS, which has a stronger security proof than the signature
method used in earlier versions. The standard recommends that RSA-PSS
be used in new designs, instead of the older algorithm.
This patch implements RSA-PSS verification for a specific set of
parameters:
- RSA-2048
- SHA256 for both the message digest and the internal hash
- 32-byte salt
- 2047 bit message
Although RSA-PSS supports other parameters, due to size constraints,
this verificatino code only supports these specific parameters, and
signatures with other parameters will be considered invalid.
To encourage the use of the more secure algorithm, the default build
configuration is RSA-PSS. BOOTUTIL_RSA_PKCS1_15 needs to be defined in
order to support the older signature algorithm.
Remove most of mynewt specific stuff to a separate port package. This
should make mcuboot less "mynewt'y" and slightly easier to port to.
- Mynewt specific stuff moved to boot/mynewt.
- Sample app moved from apps/boot to boot/mynewt.
- Use MYNEWT_VAL macro only on mynewt port.
- BOOTUTIL_* and MYNEWT_VAL() usage moved to MCUBOOT_ defines.
Add a configuration option "BOOTUTIL_OVERWRITE_ONLY" that avoids using
the image swap code. Instead, when an upgrade is detected in slot 1, it
is copied directly onto slot 0. As long as the image in slot 1 is
valid, this should work robustly (it will redo it if power is lost
during the upgrade).
This doesn't protect against the case of deploying an image that fails
to boot on some devices. But, the behavior is similar to the swap
upgrade approach when the slot 1 image is marked initially as "image
ok", but without the complexity (or need of a swap partition) of the
swap code.
When building with ECDSA P-256 as the signature algorithm, we are still
bringing in SHA256 and some ASN.1 code from mbed TLS. Fix part of this
by wrapping the hash functions with general routines (inline functions)
allowing to select between mbed TLS and Tinycrypt for the
implementation.
Update the Zephyr config files so that the Tinycrypt version is used
when building the ECDSA P-256 signing variant.
arduino_101.conf was moved up a level, but the toplevel Makefile
was not updated so that it can be located.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
To build Zephyr as a bootloader will typically require
overriding the default flash regions where the binary lives,
and possibly other board-specific configuration directives.
Look for boot/zephyr/targets/$(BOARD).conf and include it
in the kernel configuration if it exists.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
Make it clear in the top-level Makefile how to configure mcuboot for
Zephyr for a particular signing algorithm. Currently supported, are the
RSA signatures, and ECDSA with the P-256 curve. These configuration
lines will select the code built in the bootloader, as well as which
public key gets included with the image.
This also adds a demo public key for the P-256 signatures.
Rather than commit our specific mbedtls config file into the Zephyr
tree, include it here, and add a path early in the make process so that
it will get picked up when building the library.
The Zephyr build systems makes some assumptions about the directory
layout, and encounters problems if the necessary path contains "../..".
To help this, place the zephyr directory next to the bootutil directory
so that the Makefile can just refer to "../bootutil". This keeps all of
the build artifacts under the proper top-level directory.
The Zephyr build system does strange things if it refers to source
directories above the main Makefile (generating
outdir/<target>/../boot/... paths). For now, fix this by moving the
Zephyr Makefile to the top-level in the tree. This shouldn't have much
impact on Mynewt, as it doesn't use makefiles.
David Brown