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Expand on key derivations

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Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
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Manuel Pégourié-Gonnard 2024-09-26 10:14:55 +02:00
parent 60769762d2
commit 83f62ffc09
1 changed files with 10 additions and 4 deletions
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14
docs/architecture/psa-migration/transition-guards.md
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@ -100,12 +100,10 @@ PSA domain which should use `PSA_WANT` as usual). No special include is
required, `build_info.h` or `common.h` is enough.
**Pure TLS 1.3 domain:** it is not easy to know which uses of hashes fall in
this domain as opposed to the `USE_PSA` domain which looking at the code.
this domain as opposed to the `USE_PSA` domain whithout looking at the code.
Fortunately, `MD_CAN` and `PSA_WANT` macros can be used interchangeably, as
per the note above.
HMAC
----
@ -188,7 +186,15 @@ ciphers and modes it needs to know about.
Key derivation
--------------
**Legacy and `USE_PSA` domains:** no users here.
**Legacy domain:** the modules PKCS5 and PKCS12 both provide
key derivation (respectively PBKDF2-HMAC and PKCS12 derivation), and use it
for password-based encryption. (Note: PEM has an implementation of PBKDF1 but
it's internal.)
**`USE_PSA` domain:** PK (parse) will use PKCS5 and PKCS12 encryption (hence
indirectly key derivation) if present in the build. The macros are
`MBEDTLS_PKCS5_C` and `MBEDTLS_PKCS12_C`. Note that even when `USE_PSA` is
enabled, PK parse will _not_ use PSA for the PBKDF2 part of PKCS5 decryption.
**Pure TLS 1.3 domain:** TLS 1.3 is using HKDF via PSA Crypto APIs. We already
enforce in `check_config.h` that TLS 1.3 depends on the appropriate `PSA_WANT`