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Add ChangeLog entry about driver-only hashes.

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(The first entry will need editing if support for ENTROPY_C is sorted out
before the next release.)

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
This commit is contained in:
Manuel Pégourié-Gonnard 2022-09-15 12:26:32 +02:00
parent 72687b76ca
commit c998e43eb4
1 changed files with 20 additions and 0 deletions
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ChangeLog.d/driver-only-hashes.txt Normal file
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Features
* Some crypto modules that previously depended on MD or a low-level hash
module, either unconditionally (RSA, PK, PKCS5, PKCS12, EC J-PAKE), or
for some features (PEM for encrypted files), are now able to use PSA
Crypto instead when the legacy API is not available. This means it is
now possible to use all features from those modules in configurations
where the built-in implementations of hashes are excluded and the hashes
are only provided by PSA drivers. In these configurations, you need to
call `psa_crypto_init()` before you call any function from those
modules; this is not required in configurations where the built-in
implementation is still available. Note that some crypto modules and
features still depend on the built-in implementation of hashes:
MBEDTLS_HKDF_C (but the PSA HKDF function do not depend on it),
MBEDTLS_ENTROPY_C, MBEDTLS_HMAC_DRBG_C and MBEDTLS_ECDSA_DETERMINISTIC.
In particular, for now, compiling without built-in hashes requires use
of MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG.
* When MBEDTLS_USE_PSA_CRYPTO is enabled, X.509, TLS 1.2 and TLS 1.3 no
longer depend on MD. This means it is now possible to use them in
configurations where the built-in implementations of hashes are excluded
and the hashes are only provided by PSA drivers.