+ unsigned rsa_inlen);
+int get_rsa_key(char *key_file, RSA **rsa, int private);
+
+void rsa_free(RSA *rsa);
+void get_random_bytes_or_die(unsigned char *buf, int num);
+void init_random_seed_or_die(void);
+
+struct rc4_context {
+ int fd;
+ RC4_KEY recv_key;
+ RC4_KEY send_key;
+};
+int rc4_send_bin_buffer(struct rc4_context *rc4c, const char *buf, size_t len);
+int rc4_send_buffer(struct rc4_context *rc4c, const char *buf);
+__printf_2_3 int rc4_send_va_buffer(struct rc4_context *rc4c, const char *fmt, ...);
+int rc4_recv_bin_buffer(struct rc4_context *rcc, char *buf, size_t size);
+int rc4_recv_buffer(struct rc4_context *rcc, char *buf, size_t size);
+
+/** \cond used to distinguish between loading of private/public key */
+#define LOAD_PUBLIC_KEY 0
+#define LOAD_PRIVATE_KEY 1
+#define CHALLENGE_SIZE 64
+/** \endcond **/