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Document that curve lists can include partially-supported curves

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Document that a curve returned by mbedtls_ecp_curve_list() or
mbedtls_ecp_grp_id_list() may lack support for ECDH or ECDSA.

Add a corresponding changelog entry, under "API Changes" because we
have changed the behavior: formerly, these functions skipped ECDH-only
curves, although this was not documented.
This commit is contained in:
Gilles Peskine 2019-02-11 18:43:55 +01:00 committed by Janos Follath
parent c6c7c49fd6
commit 7e65c05bb0
1 changed files with 5 additions and 0 deletions
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ChangeLog
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@ -286,6 +286,11 @@ API Changes
that it is now optional with the MBEDTLS_CHECK_PARAMS flag which by default
is off. That means that checks which were previously present by default
will no longer be.
* The functions mbedtls_ecp_curve_list() and mbedtls_ecp_grp_id_list() now
list all curves for which at least one of ECDH or ECDSA is supported, not
just curves for which both are supported. Call mbedtls_ecdsa_can_do() or
mbedtls_ecdh_can_do() on each result to check whether each algorithm is
supported.
New deprecations
* Deprecate mbedtls_ctr_drbg_update and mbedtls_hmac_drbg_update