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psa: Document requirements for psa_export_public_key()

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Copy the nice and clear documentation from psa_export_key() as to what
implementations are allowed to do regarding key export formats, as the
same applies to public keys.
This commit is contained in:
Jaeden Amero 2019-01-11 17:15:56 +00:00
parent 83d293951c
commit d3a0c2c779
1 changed files with 7 additions and 0 deletions
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7
include/psa/crypto.h
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@ -467,6 +467,13 @@ psa_status_t psa_export_key(psa_key_handle_t handle,
* The output of this function can be passed to psa_import_key() to
* create an object that is equivalent to the public key.
*
* This specification supports a single format for each key type.
* Implementations may support other formats as long as the standard
* format is supported. Implementations that support other formats
* should ensure that the formats are clearly unambiguous so as to
* minimize the risk that an invalid input is accidentally interpreted
* according to a different format.
*
* The format is the DER representation defined by RFC 5280 as
* `SubjectPublicKeyInfo`, with the `subjectPublicKey` format
* specified below.