/*
This file is part of GNUnet.
- (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
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
For the actual CRC-32 code:
Copyright abandoned; this code is in the public domain.
* @author Christian Grothoff
*/
#include "platform.h"
-#include "gnunet_util_lib.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
* @param sum current sum, initially 0
* @param buf buffer to calculate CRC over (must be 16-bit aligned)
* @param len number of bytes in hdr, must be multiple of 2
- * @return updated crc sum (must be subjected to GNUNET_CRYPTO_crc16_finish to get actual crc16)
+ * @return updated crc sum (must be subjected to #GNUNET_CRYPTO_crc16_finish() to get actual crc16)
*/
uint32_t
GNUNET_CRYPTO_crc16_step (uint32_t sum, const void *buf, size_t len)
/**
- * Convert results from GNUNET_CRYPTO_crc16_step to final crc16.
+ * Convert results from #GNUNET_CRYPTO_crc16_step() to final crc16.
*
* @param sum cummulative sum
* @return crc16 value
}
+/**
+ * @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 */