more renamings relating to 'new' service now just being the 'normal' service

[oweals/gnunet.git] / src / util / crypto_crc.c

diff --git a/src/util/crypto_crc.c b/src/util/crypto_crc.c
index ec2e8068308e7b920c1cce645219250f354ffce3..03b24d9f76cce9a124a93d9bebf67ffe852ed9e1 100644 (file)
--- a/src/util/crypto_crc.c
+++ b/src/util/crypto_crc.c
@@ -1,6 +1,6 @@
 /*
      This file is part of GNUnet.
-     Copyright (C) 2001, 2002, 2003, 2004, 2006 Christian Grothoff (and other contributing authors)
+     Copyright (C) 2001, 2002, 2003, 2004, 2006 GNUnet e.V.
 
      GNUnet is free software; you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published
@@ -30,7 +30,7 @@
 #include "platform.h"
 #include "gnunet_crypto_lib.h"
 
-#define LOG(kind,...) GNUNET_log_from (kind, "util", __VA_ARGS__)
+#define LOG(kind,...) GNUNET_log_from (kind, "util-crypto-crc", __VA_ARGS__)
 
 /* Avoid wasting space on 8-byte longs. */
 #if UINT_MAX >= 0xffffffff
@@ -165,5 +165,35 @@ GNUNET_CRYPTO_crc16_n (const void *buf, size_t len)
 }
 
 
+/**
+ * @ingroup hash
+ * Calculate the checksum of a buffer in one step.
+ *
+ * @param buf buffer to calculate CRC over
+ * @param len number of bytes in @a buf
+ * @return crc8 value
+ */
+uint8_t
+GNUNET_CRYPTO_crc8_n (const void *buf,
+                      size_t len)
+{
+  const uint8_t *data = buf;
+  unsigned int crc = 0;
+  int i;
+  int j;
+
+  for (j = len; 0 != j; j--)
+  {
+    crc ^= (*data++ << 8);
+    for (i = 8; 0 != i; i--)
+    {
+      if (0 != (crc & 0x8000))
+        crc ^= (0x1070 << 3);
+      crc <<= 1;
+    }
+  }
+  return (uint8_t) (crc >> 8);
+}
+
 
 /* end of crypto_crc.c */