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Sketch the work to migrate to MD light

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Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
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Gilles Peskine 2022-11-25 23:04:51 +01:00
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docs/architecture/psa-migration/md-cipher-dispatch.md
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@ -382,3 +382,27 @@ Note that this assumes that an operation that has been started via PSA can be co
#### Error code conversion
After calling a PSA function, call `mbedtls_md_error_from_psa` to convert its status code. This function is currently defined in `hash_info.c`.
### Migration to MD light
#### Migration of modules that used to call MD and now do the legacy-or-PSA dance
Get rid of the case where `MBEDTLS_MD_C` is undefined. Enable `MBEDTLS_MD_LIGHT` in `build_info.h`.
#### Migration of modules that used to call a low-level hash module and now do the legacy-or-PSA dance
Switch to calling MD (light) unconditionally. Enable `MBEDTLS_MD_LIGHT` in `build_info.h`.
#### Migration of modules that call a low-level hash module
Switch to calling MD (light). Enable `MBEDTLS_MD_LIGHT` in `build_info.h`.
#### Migration of use-PSA mixed code
Instead of calling `hash_info.h` functions to obtain metadata, get it from `md.h`.
Optionally, code that currently tests on `MBEDTLS_USE_PSA_CRYPTO` just to determine whether to call MD or PSA to calculate hashes can switch to just having the MD variant.
#### Remove `legacy_or_psa.h`
It's no longer used.