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Recommend firmware TRNG #152

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vstehle merged 2 commits into from
Nov 19, 2025
Merged

Recommend firmware TRNG #152

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14ccb99
references: add reference to arm trng specification
vstehle Nov 12, 2025
c9319b1
chapter3: recommend trng
vstehle Nov 12, 2025
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11 changes: 11 additions & 0 deletions source/chapter3-secureworld.rst
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Expand Up @@ -128,6 +128,17 @@ implementation requirements take precedence. [#SCMINote]_
which eases agents and platforms interoperability, and this is therefore the
recommended implementation.

AArch64 Random Number Generator
-------------------------------

On AArch64 platforms, if the platform has a hardware entropy source it is
recommended that privileged or secure firmware implements the True Random Number
Generator Firmware Interface version 1.0, as defined in [TRNG]_. [#TRNGNote]_

.. [#TRNGNote] The firmware TRNG is complementary to the `EFI_RNG_PROTOCOL` as
it can be used at runtime.
The TRNG interface requires SMCCC version 1.1 or later.

RISC-V Multiprocessor Startup Protocol
======================================

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4 changes: 4 additions & 0 deletions source/references.rst
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Expand Up @@ -73,3 +73,7 @@ Bibliography
.. [TCG2] `TCG EFI Protocol Specification, Family “2.0”, Level 00 Revision 00.13
<https://trustedcomputinggroup.org/wp-content/uploads/EFI-Protocol-Specification-rev13-160330final.pdf>`_,
March 2016, `Trusted Computing Group <https://trustedcomputinggroup.org/>`_

.. [TRNG] `Arm True Random Number Generator Firmware Interface version 1.0
<https://developer.arm.com/documentation/den0098/1-0>`_,
January 2022, `Arm Limited <https://www.arm.com/>`_