Hi,
My goal is to implement ECDH in my own engine. The snippet below shows
the struct that needs to be filled and set as the engine's ECDH method:
struct ecdh_method {
const char *name;
int (*compute_key) (void *key, size_t outlen, const EC_POINT *pub_key,
EC_KEY *ecdh, void *(*KDF) (const void *in,
size_t inlen, void *out,
size_t *outlen));
# if 0
int (*init) (EC_KEY *eckey);
int (*finish) (EC_KEY *eckey);
# endif
int flags;
char *app_data;
};
I intend to leverage the KDF mechanism, but it does not seem to be
exposed in the EVP API. Is that possible at all? If yes, how do I do
that? If no, what is the purpose of the KDF() parameter in compute_key?
(By the way, struct ecdh_method is in crypto/ecdh/ech_locl.h, which
seems to be a private header file. Am I supposed/allowed to include it
anyway?)
Thanks in advance,
Reinier
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