Sha256: fbc0750d32cd0b5762276bde71d5a26afb77162867ed2cc1d1867870566e0034
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Versions: 9
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Contents
/* ykcrc.c --- Implementation of Yubikey CRC-16 function.
*
* Written by Simon Josefsson <simon@josefsson.org>.
* Copyright (c) 2006, 2007, 2008, 2009 Yubico AB
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "yubikey.h"
uint16_t
yubikey_crc16 (const uint8_t *buf, size_t buf_size)
{
uint16_t m_crc = 0xffff;
while (buf_size--)
{
int i, j;
m_crc ^= (uint8_t) * buf++ & 0xFF;
for (i = 0; i < 8; i++)
{
j = m_crc & 1;
m_crc >>= 1;
if (j)
m_crc ^= 0x8408;
}
}
return m_crc;
}
Version data entries
9 entries across 9 versions & 2 rubygems