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New function mbedtls_ecp_write_public_key

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Directly export the public part of a key pair without having to go through
intermediate objects (using mbedtls_ecp_point_write_binary would require a
group object and a point object).

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2023-06-22 22:27:32 +02:00
parent 6dd87384ae
commit 62e33bcc64
3 changed files with 59 additions and 9 deletions
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26
include/mbedtls/ecp.h
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@ -1346,6 +1346,32 @@ int mbedtls_ecp_read_key(mbedtls_ecp_group_id grp_id, mbedtls_ecp_keypair *key,
int mbedtls_ecp_write_key(mbedtls_ecp_keypair *key,
unsigned char *buf, size_t buflen);
/**
* \brief This function exports an elliptic curve public key.
*
* \param key The public key.
* \param format The point format. This must be either
* #MBEDTLS_ECP_PF_COMPRESSED or #MBEDTLS_ECP_PF_UNCOMPRESSED.
* (For groups without these formats, this parameter is
* ignored. But it still has to be either of the above
* values.)
* \param olen The address at which to store the length of
* the output in Bytes. This must not be \c NULL.
* \param buf The output buffer. This must be a writable buffer
* of length \p buflen Bytes.
* \param buflen The length of the output buffer \p buf in Bytes.
*
* \return \c 0 on success.
* \return #MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL if the output buffer
* is too small to hold the point.
* \return #MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE if the point format
* or the export for the given group is not implemented.
* \return Another negative error code on other kinds of failure.
*/
int mbedtls_ecp_write_public_key(mbedtls_ecp_keypair *key,
int format, size_t *olen,
unsigned char *buf, size_t buflen);
/**
* \brief This function checks that the keypair objects
* \p pub and \p prv have the same group and the