The TBBR implementation extracts public keys from certificates and stores them in static buffers. DER-encoded ECDSA keys are only 91 bytes each but were each allocated 294 bytes instead. Reducing the size of these buffers saves 609 bytes of BSS in BL2 (294 - 91 = 203 bytes for each of the 3 key buffers in use). Also add a comment claryfing that key buffers are tailored on RSA key sizes when both ECDSA and RSA keys are used. Change-Id: Iad332856e7af1f9814418d012fba3e1e9399f72a Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com> |
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bl1 | ||
bl2 | ||
bl2u | ||
bl31 | ||
bl32 | ||
common | ||
docs | ||
drivers | ||
fdts | ||
include | ||
lib | ||
make_helpers | ||
plat | ||
services | ||
tools | ||
.checkpatch.conf | ||
.editorconfig | ||
.gitignore | ||
Makefile | ||
dco.txt | ||
license.rst | ||
readme.rst |
readme.rst
Trusted Firmware-A
Trusted Firmware-A (TF-A) is a reference implementation of secure world software for Arm A-Profile architectures (Armv8-A and Armv7-A), including an Exception Level 3 (EL3) Secure Monitor. It provides a suitable starting point for productization of secure world boot and runtime firmware, in either the AArch32 or AArch64 execution states.
TF-A implements Arm interface standards, including:
- Power State Coordination Interface (PSCI)
- Trusted Board Boot Requirements CLIENT (TBBR-CLIENT)
- SMC Calling Convention
- System Control and Management Interface (SCMI)
- Software Delegated Exception Interface (SDEI)
The code is designed to be portable and reusable across hardware platforms and software models that are based on the Armv8-A and Armv7-A architectures.
In collaboration with interested parties, we will continue to enhance TF-A with reference implementations of Arm standards to benefit developers working with Armv7-A and Armv8-A TrustZone technology.
Users are encouraged to do their own security validation, including penetration testing, on any secure world code derived from TF-A.
More Info and Documentation
To find out more about Trusted Firmware-A, please view the full documentation that is available through trustedfirmware.org.
Copyright (c) 2013-2019, Arm Limited and Contributors. All rights reserved.