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Add warning about not using keys directly

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Keys that are the result of key agreement have biases and really should
not be used directly. Warning taken in part from psa_raw_key_agreement()

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
This commit is contained in:
Paul Elliott 2024-08-01 18:28:07 +01:00
parent 327da4774b
commit e50edc0d95
1 changed files with 6 additions and 0 deletions
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6
tf-psa-crypto/include/psa/crypto.h
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@ -4887,6 +4887,12 @@ uint32_t psa_key_agreement_iop_get_num_ops(psa_key_agreement_iop_t *operation);
* at any point. It is not bound by the usual
* interface stability promises.
*
* \warning The raw result of a key agreement algorithm such
* elliptic curve Diffie-Hellman has biases
* and should not be used directly as key material.
* It should instead be passed as input to a key
* derivation algorithm.
*
* \note This function combined with \c
* psa_key_agreement_iop_complete() is equivalent
* to \c psa_raw_key_agreement() but \c