+ static FILE* client_open_enc(const char*, const char*);
+ static FILE* client_open_rescue(const char*, const char*);
+ static int client_unlink(const char *path);
+ static int client_encrypt(const unsigned char *pt, size_t pt_len,
+ unsigned char **ct, size_t *ct_len);
+ static int client_decrypt(const unsigned char *ct, size_t ct_len,
+ unsigned char **pt, size_t *pt_len);