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Update changelog & readme

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This patch adds explicit wording to state
that Two's complement is the official
supported signed integer representation.

Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
This commit is contained in:
Minos Galanakis 2021-12-08 17:38:07 +00:00
parent 582f2398d4
commit 5c93a9f214
2 changed files with 11 additions and 0 deletions
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3
ChangeLog.d/twos_complement_representation.txt Normal file
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@ -0,0 +1,3 @@
Requirement changes
* Sign-magnitude and one's complement representations for signed integers are
not supported. Two's complement is the only supported representation.

8
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
--------------------