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New function mbedtls_ecp_set_public_key

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Set the public key in a key pair. This complements mbedtls_ecp_read_key and
the functions can be used in either order.

Document the need to call check functions separately.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2023-06-21 19:52:11 +02:00
parent 091a85a762
commit 28240323d3
4 changed files with 196 additions and 0 deletions
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32
include/mbedtls/ecp.h
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@ -1259,6 +1259,38 @@ int mbedtls_ecp_gen_key(mbedtls_ecp_group_id grp_id, mbedtls_ecp_keypair *key,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng);
/** \brief Set the public key in a key pair object.
*
* \note This function does not check that the point actually
* belongs to the given group. Call mbedtls_ecp_check_pubkey()
* on \p Q before calling this function to check that.
*
* \note This function does not check that the public key matches
* the private key that is already in \p key, if any.
* To check the consistency of the resulting key pair object,
* call mbedtls_ecp_check_pub_priv() after setting both
* the public key and the private key.
*
* \param grp_id The ECP group identifier.
* \param key The key pair object. It must be initialized.
* If its group has already been set, it must match \p grp_id.
* If its group has not been set, it will be set to \p grp_id.
* If the public key has already been set, it is overwritten.
* \param Q The public key to copy. This must be a point on the
* curve indicated by \p grp_id.
*
* \return \c 0 on success.
* \return #MBEDTLS_ERR_ECP_BAD_INPUT_DATA if \p key does not
* match \p grp_id.
* \return #MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE if the operation for
* the group is not implemented.
* \return #MBEDTLS_ERR_MPI_ALLOC_FAILED on memory-allocation failure.
* \return Another negative error code on other kinds of failure.
*/
int mbedtls_ecp_set_public_key(mbedtls_ecp_group_id grp_id,
mbedtls_ecp_keypair *key,
const mbedtls_ecp_point *Q);
/**
* \brief This function reads an elliptic curve private key.
*