int EVP_PKEY_encapsulate(EVP_PKEY_CTX *ctx,
unsigned char *wrappedkey, size_t *wrappedkeylen,
unsigned char *genkey, size_t *genkeylen);
int EVP_PKEY_decapsulate_init(EVP_PKEY_CTX *ctx, const OSSL_PARAM params[]);
int EVP_PKEY_encapsulate(EVP_PKEY_CTX *ctx,
unsigned char *wrappedkey, size_t *wrappedkeylen,
unsigned char *genkey, size_t *genkeylen);
int EVP_PKEY_decapsulate_init(EVP_PKEY_CTX *ctx, const OSSL_PARAM params[]);