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mbedtls_ecp_write_key_ext(): new function

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Same as mbedtls_ecp_write_key(), but doesn't require the caller to figure out
the length of the output and possibly distinguish between Weierstrass and
Montgomery curves.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2024-02-19 16:27:35 +01:00
parent 7f523bf9eb
commit e3fb4ccabf
5 changed files with 195 additions and 0 deletions
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20
include/mbedtls/ecp.h
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@@ -1370,6 +1370,26 @@ 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 private key.
*
* \param key The private key.
* \param olen On success, the length of the private key.
* This is always (`grp->nbits` + 7) / 8 bytes
* where `grp->nbits` is the private key size in bits.
* \param buf The output buffer for containing the binary representation
* of the key.
* \param buflen The total length of the buffer in bytes.
* #MBEDTLS_ECP_MAX_BYTES is always sufficient.
*
* \return \c 0 on success.
* \return #MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL if the \p key
* representation is larger than the available space in \p buf.
* \return Another negative error code on different kinds of failure.
*/
int mbedtls_ecp_write_key_ext(mbedtls_ecp_keypair *key,
size_t *olen, unsigned char *buf, size_t buflen);
/**
* \brief This function exports an elliptic curve public key.
*