crypt: Move implementation-independent code to separate file.

[paraslash.git] / crypt.h

diff --git a/crypt.h b/crypt.h
index 898e3446e98364eb2bb879323af34bb8838beb94..d2c2b32024ccdaa1d35af2b7b3813976040f61e7 100644 (file)
--- a/crypt.h
+++ b/crypt.h
@@ -4,7 +4,16 @@
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
 
-/** \file crypt.h Prototypes for paraslash crypto functions. */
+/** \file crypt.h Public crypto interface. */
+
+
+/** \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 **/
+
+/* asymetric (public key) crypto */
 
 /** Opaque structure for public and private keys. */
 struct asymmetric_key;
@@ -17,32 +26,48 @@ int get_asymmetric_key(const char *key_file, int private,
                struct asymmetric_key **result);
 void free_asymmetric_key(struct asymmetric_key *key);
 
+/* random numbers */
 void get_random_bytes_or_die(unsigned char *buf, int num);
 void init_random_seed_or_die(void);
 
+/* stream cipher declarations and prototypes */
+
+/** Opaque structure for stream ciphers. */
+struct stream_cipher;
+/** Number of bytes of the session key for stream ciphers. */
+#define SESSION_KEY_LEN 32
 /**
- * Used on the server-side for client-server communication encryption.
+ * Used for client-server communication encryption.
  *
- * The traffic between (the forked child of) para_server and the remote
- * client process is crypted by a RC4 session key. This structure contains
- * the RC4 keys and the file descriptor for which these keys should be used.
+ * The traffic between (the forked child of) para_server and the remote client
+ * process is crypted by a symmetric session key. This structure contains the
+ * keys for the stream cipher and the file descriptor for which these keys
+ * should be used.
  */
-struct rc4_context {
+struct stream_cipher_context {
        /** The socket file descriptor. */
        int fd;
-       /** Key used for sending data. */
-       RC4_KEY recv_key;
        /** Key used for receiving data. */
-       RC4_KEY send_key;
+       struct stream_cipher *recv;
+       /** Key used for sending data. */
+       struct stream_cipher *send;
 };
-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);
+struct stream_cipher *sc_new(const unsigned char *data, int len);
+void sc_free(struct stream_cipher *sc);
+int sc_send_bin_buffer(struct stream_cipher_context *scc, const char *buf,
+               size_t len);
+int sc_send_buffer(struct stream_cipher_context *scc, const char *buf);
+__printf_2_3 int sc_send_va_buffer(struct stream_cipher_context *scc,
+               const char *fmt, ...);
+int sc_recv_bin_buffer(struct stream_cipher_context *scc, char *buf,
+               size_t size);
+int sc_recv_buffer(struct stream_cipher_context *scc, 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 **/
+/* hashing */
+
+/** Size of the hash value in bytes. */
+#define HASH_SIZE 20
+
+void hash_function(const char *data, unsigned long len, unsigned char *hash);
+void hash_to_asc(unsigned char *hash, char *asc);
+int hash_compare(unsigned char *h1, unsigned char *h2);