herrie/src/md5.h

   1 /*
   2  * Copyright (c) 2006-2011 Ed Schouten <ed@80386.nl>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26 /**
  27  * @file md5.h
  28  * @brief MD5 hashing.
  29  */
  30
  31 /**
  32  * @brief Internal state of the MD5 hash calculation.
  33  */
  34 struct md5_context {
  35         /**
  36          * @brief Buffer to store partial 64 byte frames.
  37          */
  38         uint32_t buf[16];
  39         /**
  40          * @brief MD5 hash of the partially hashed stream.
  41          */
  42         uint32_t state[4];
  43         /**
  44          * @brief Amount of bytes that have been hashed.
  45          */
  46         uint64_t count;
  47 };
  48
  49 /**
  50  * @brief Contents of an initialized MD5 context.
  51  */
  52 #define MD5CONTEXT_INITIALIZER \
  53         { { 0 }, { 0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476 }, 0 }
  54 /**
  55  * @brief Update the hash value by appending a buffer.
  56  */
  57 void md5_update(struct md5_context *m, const void *buf, size_t len);
  58 /**
  59  * @brief Finalize the hash value and return its hash value.
  60  */
  61 void md5_final(struct md5_context *m, unsigned char out[16]);