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Merge pull request #5308 from minosgalanakis/development_2.x

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Backport 2.x: Document platform architecture portability constraints
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Gilles Peskine 2021-12-10 21:13:09 +01:00 committed by GitHub
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ChangeLog.d/twos_complement_representation.txt Normal file
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Requirement changes
* Sign-magnitude and one's complement representations for signed integers are
not supported. Two's complement is the only supported representation.

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README.md
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@ -197,6 +197,14 @@ Mbed TLS can be ported to many different architectures, OS's and platforms. Befo
- [What external dependencies does Mbed TLS rely on?](https://tls.mbed.org/kb/development/what-external-dependencies-does-mbedtls-rely-on)
- [How do I configure Mbed TLS](https://tls.mbed.org/kb/compiling-and-building/how-do-i-configure-mbedtls)
Mbed TLS is mostly written in portable C99; however, it has a few platform requirements that go beyond the standard, but are met by most modern architectures:
- Bytes must be 8 bits.
- All-bits-zero must be a valid representation of a null pointer.
- Signed integers must be represented using two's complement.
- `int` and `size_t` must be at least 32 bits wide.
- The types `uint8_t`, `uint16_t`, `uint32_t` and their signed equivalents must be available.
PSA cryptography API
--------------------