*/
int EVP_add_mac(const EVP_MAC *mac);
+/* struct evp_kdf_impl_st is defined by the implementation */
+typedef struct evp_kdf_impl_st EVP_KDF_IMPL;
+typedef struct {
+ int type;
+ EVP_KDF_IMPL *(*new) (void);
+ void (*free) (EVP_KDF_IMPL *impl);
+ void (*reset) (EVP_KDF_IMPL *impl);
+ int (*ctrl) (EVP_KDF_IMPL *impl, int cmd, va_list args);
+ int (*ctrl_str) (EVP_KDF_IMPL *impl, const char *type, const char *value);
+ size_t (*size) (EVP_KDF_IMPL *impl);
+ int (*derive) (EVP_KDF_IMPL *impl, unsigned char *key, size_t keylen);
+} EVP_KDF_METHOD;
+
+extern const EVP_KDF_METHOD pbkdf2_kdf_meth;
+extern const EVP_KDF_METHOD scrypt_kdf_meth;
+extern const EVP_KDF_METHOD tls1_prf_kdf_meth;
+extern const EVP_KDF_METHOD hkdf_kdf_meth;
+
struct evp_md_st {
int type;
int pkey_type;