Changeset 5614 for pjproject/trunk/third_party/srtp/crypto/replay/rdb.c

Timestamp:

Jul 4, 2017 5:22:51 AM (7 years ago)

Author:

nanang

Message:

Close #1993: Updated bundled libSRTP version to 2.1.0.

File:

• pjproject/trunk/third_party/srtp/crypto/replay/rdb.c (modified) (2 diffs)

pjproject/trunk/third_party/srtp/crypto/replay/rdb.c

@@ -9 +9 @@
 
 /*
- *      
- * Copyright (c) 2001-2006, Cisco Systems, Inc.
+ *
+ * Copyright (c) 2001-2017, Cisco Systems, Inc.
  * All rights reserved.
- * 
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
- * 
+ *
  *   Redistributions of source code must retain the above copyright
  *   notice, this list of conditions and the following disclaimer.
- * 
+ *
  *   Redistributions in binary form must reproduce the above
  *   copyright notice, this list of conditions and the following
  *   disclaimer in the documentation and/or other materials provided
  *   with the distribution.
- * 
+ *
  *   Neither the name of the Cisco Systems, Inc. nor the names of its
  *   contributors may be used to endorse or promote products derived
  *   from this software without specific prior written permission.
- * 
+ *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
@@ -54 +54 @@
 /*
  * this implementation of a replay database works as follows:
- * 
+ *
  * window_start is the index of the first packet in the window
  * bitmask      a bit-buffer, containing the most recently entered
- *              index as the leftmost bit 
+ *              index as the leftmost bit
  *
  */
 
-/* rdb_init initalizes rdb */
-
-err_status_t
-rdb_init(rdb_t *rdb) {
-  v128_set_to_zero(&rdb->bitmask);
-  rdb->window_start = 0;
-  return err_status_ok;
+/* srtp_rdb_init initalizes rdb */
+srtp_err_status_t srtp_rdb_init (srtp_rdb_t *rdb)
+{
+    v128_set_to_zero(&rdb->bitmask);
+    rdb->window_start = 0;
+    return srtp_err_status_ok;
 }
 
 /*
- * rdb_check checks to see if index appears in rdb
+ * srtp_rdb_check checks to see if index appears in rdb
  */
+srtp_err_status_t srtp_rdb_check (const srtp_rdb_t *rdb, uint32_t p_index)
+{
 
-err_status_t
-rdb_check(const rdb_t *rdb, uint32_t p_index) {
-  
-  /* if the index appears after (or at very end of) the window, its good */
-  if (p_index >= rdb->window_start + rdb_bits_in_bitmask)
-    return err_status_ok;
-  
-  /* if the index appears before the window, its bad */
-  if (p_index < rdb->window_start)
-    return err_status_replay_old;
+    /* if the index appears after (or at very end of) the window, its good */
+    if (p_index >= rdb->window_start + rdb_bits_in_bitmask) {
+        return srtp_err_status_ok;
+    }
 
-  /* otherwise, the index appears within the window, so check the bitmask */
-  if (v128_get_bit(&rdb->bitmask, (p_index - rdb->window_start)) == 1)
-    return err_status_replay_fail;    
-      
-  /* otherwise, the index is okay */
-  return err_status_ok;
+    /* if the index appears before the window, its bad */
+    if (p_index < rdb->window_start) {
+        return srtp_err_status_replay_old;
+    }
+
+    /* otherwise, the index appears within the window, so check the bitmask */
+    if (v128_get_bit(&rdb->bitmask, (p_index - rdb->window_start)) == 1) {
+        return srtp_err_status_replay_fail;
+    }
+
+    /* otherwise, the index is okay */
+    return srtp_err_status_ok;
 }
 
 /*
- * rdb_add_index adds index to rdb_t (and does *not* check if
+ * srtp_rdb_add_index adds index to srtp_rdb_t (and does *not* check if
  * index appears in db)
  *
- * this function should be called only after rdb_check has
+ * this function should be called only after srtp_rdb_check has
  * indicated that the index does not appear in the rdb, e.g., a mutex
  * should protect the rdb between these calls
  */
+srtp_err_status_t srtp_rdb_add_index (srtp_rdb_t *rdb, uint32_t p_index)
+{
+    int delta;
 
-err_status_t
-rdb_add_index(rdb_t *rdb, uint32_t p_index) {
-  int delta;  
+    /* here we *assume* that p_index > rdb->window_start */
 
-  /* here we *assume* that p_index > rdb->window_start */
+    delta = (p_index - rdb->window_start);
+    if (delta < rdb_bits_in_bitmask) {
 
-  delta = (p_index - rdb->window_start);    
-  if (delta < rdb_bits_in_bitmask) {
+        /* if the p_index is within the window, set the appropriate bit */
+        v128_set_bit(&rdb->bitmask, delta);
 
-    /* if the p_index is within the window, set the appropriate bit */
-    v128_set_bit(&rdb->bitmask, delta);
+    } else {
 
-  } else { 
-    
-    delta -= rdb_bits_in_bitmask - 1;
+        delta -= rdb_bits_in_bitmask - 1;
 
-    /* shift the window forward by delta bits*/
-    v128_left_shift(&rdb->bitmask, delta);
-    v128_set_bit(&rdb->bitmask, rdb_bits_in_bitmask-1);
-    rdb->window_start += delta;
+        /* shift the window forward by delta bits*/
+        v128_left_shift(&rdb->bitmask, delta);
+        v128_set_bit(&rdb->bitmask, rdb_bits_in_bitmask - 1);
+        rdb->window_start += delta;
 
-  }    
+    }
 
-  return err_status_ok;
+    return srtp_err_status_ok;
 }
 
-err_status_t
-rdb_increment(rdb_t *rdb) {
+srtp_err_status_t srtp_rdb_increment (srtp_rdb_t *rdb)
+{
 
-  if (rdb->window_start++ > 0x7fffffff)
-    return err_status_key_expired;
-  return err_status_ok;
+    if (rdb->window_start >= 0x7fffffff) {
+        return srtp_err_status_key_expired;
+    }
+    ++rdb->window_start;
+    return srtp_err_status_ok;
 }
 
-uint32_t
-rdb_get_value(const rdb_t *rdb) {
-  return rdb->window_start;
+uint32_t srtp_rdb_get_value (const srtp_rdb_t *rdb)
+{
+    return rdb->window_start;
 }