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Support partial export from mbedtls_ecp_keypair

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Sometimes you don't need to have all the parts of a key pair object. Relax
the behavior of mbedtls_ecp_keypair so that you can extract just the parts
that you need.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2023-06-21 18:24:04 +02:00
parent e6886102ef
commit ba5b5d67aa
3 changed files with 23 additions and 6 deletions
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9
include/mbedtls/ecp.h
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@ -1338,13 +1338,16 @@ mbedtls_ecp_group_id mbedtls_ecp_keypair_get_group_id(
/**
* \brief This function exports generic key-pair parameters.
*
* Each of the output parameters can be a null pointer
* if you do not need that parameter.
*
* \param key The key pair to export from.
* \param grp Slot for exported ECP group.
* It must point to an initialized ECP group.
* It must either be null or point to an initialized ECP group.
* \param d Slot for the exported secret value.
* It must point to an initialized mpi.
* It must either be null or point to an initialized mpi.
* \param Q Slot for the exported public value.
* It must point to an initialized ECP point.
* It must either be null or point to an initialized ECP point.
*
* \return \c 0 on success,
* \return #MBEDTLS_ERR_MPI_ALLOC_FAILED on memory-allocation failure.