transform: Pass a direction flag to the transform

[secnet.git] / secnet.h

diff --git a/secnet.h b/secnet.h
index 5f8e43bc5545b5f2a3ba2e9daf4178cca5ffb283..5e66a175348c9bf6ccc84969a4e1a1632bd1d0ec 100644 (file)
--- a/secnet.h
+++ b/secnet.h
@@ -12,21 +12,6 @@
 #include <sys/time.h>
 #include <netinet/in.h>
 
-/*
- * Macros added by SGT for endianness-independence
- */
-#define GET_32BIT_MSB_FIRST(cp) \
-  (((unsigned long)(unsigned char)(cp)[0] << 24) | \
-  ((unsigned long)(unsigned char)(cp)[1] << 16) | \
-  ((unsigned long)(unsigned char)(cp)[2] << 8) | \
-  ((unsigned long)(unsigned char)(cp)[3]))
-
-#define PUT_32BIT_MSB_FIRST(cp, value) ( \
-  (cp)[0] = (char)((value) >> 24), \
-  (cp)[1] = (char)((value) >> 16), \
-  (cp)[2] = (char)((value) >> 8), \
-  (cp)[3] = (char)(value) )
-
 typedef char *string_t;
 typedef const char *cstring_t;
 typedef enum {False,True} bool_t;
@@ -232,7 +217,7 @@ extern init_module random_module;
 extern init_module udp_module;
 extern init_module util_module;
 extern init_module site_module;
-extern init_module transform_module;
+extern init_module transform_cbcmac_module;
 extern init_module netlink_module;
 extern init_module rsa_module;
 extern init_module dh_module;
@@ -383,19 +368,28 @@ struct site_if {
    also depend on internal factors (eg. time) and keep internal
    state. A struct transform_if only represents a particular type of
    transformation; instances of the transformation (eg. with
-   particular key material) have a different C type. */
+   particular key material) have a different C type. The same
+   secret key will be used in opposite directions between a pair of
+   secnets; one of these pairs will get direction==False, the other True. */
 
 typedef struct transform_inst_if *transform_createinstance_fn(void *st);
-typedef bool_t transform_setkey_fn(void *st, uint8_t *key, int32_t keylen);
+typedef bool_t transform_setkey_fn(void *st, uint8_t *key, int32_t keylen,
+                                  bool_t direction);
+typedef bool_t transform_valid_fn(void *st); /* 0: no key; 1: ok */
 typedef void transform_delkey_fn(void *st);
 typedef void transform_destroyinstance_fn(void *st);
-/* Returns 0 for 'all is well', any other value for a problem */
+/* Returns:
+ *   0: all is well
+ *   1: for any other problem
+ *   2: message decrypted but sequence number was out of range
+ */
 typedef uint32_t transform_apply_fn(void *st, struct buffer_if *buf,
                                    const char **errmsg);
 
 struct transform_inst_if {
     void *st;
     transform_setkey_fn *setkey;
+    transform_valid_fn *valid;
     transform_delkey_fn *delkey;
     transform_apply_fn *forwards;
     transform_apply_fn *reverse;
@@ -406,7 +400,7 @@ struct transform_if {
     void *st;
     int32_t max_start_pad; /* these three are all <<< INT_MAX */
     int32_t max_end_pad;
-    int32_t keylen;
+    int32_t keylen; /* 0 means give the transform exactly as much as there is */
     transform_createinstance_fn *create;
 };
 
@@ -453,6 +447,7 @@ typedef void dh_makeshared_fn(void *st, uint8_t *secret,
 struct dh_if {
     void *st;
     int32_t len; /* Approximate size of modulus in bytes */
+    int32_t ceil_len; /* Number of bytes just sufficient to contain modulus */
     dh_makepublic_fn *makepublic;
     dh_makeshared_fn *makeshared;
 };