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247 lines
10 KiB
C
247 lines
10 KiB
C
#ifndef MD5_H
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#define MD5_H
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/* ========================================================================== **
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*
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* MD5.h
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*
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* Copyright:
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* Copyright (C) 2003-2005 by Christopher R. Hertel
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*
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* Email: crh@ubiqx.mn.org
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*
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* $Id: MD5.h,v 0.6 2005/06/08 18:35:59 crh Exp $
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*
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* Modifications and additions by dimok
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*
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* -------------------------------------------------------------------------- **
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*
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* Description:
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* Implements the MD5 hash algorithm, as described in RFC 1321.
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*
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* -------------------------------------------------------------------------- **
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*
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* License:
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* -------------------------------------------------------------------------- **
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*
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* Notes:
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*
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* None of this will make any sense unless you're studying RFC 1321 as you
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* read the code.
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*
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* MD5 is described in RFC 1321.
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* The MD*4* algorithm is described in RFC 1320 (that's 1321 - 1).
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* MD5 is very similar to MD4, but not quite similar enough to justify
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* putting the two into a single module. Besides, I wanted to add a few
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* extra functions to this one to expand its usability.
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*
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* There are three primary motivations for this particular implementation.
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* 1) Programmer's pride. I wanted to be able to say I'd done it, and I
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* wanted to learn from the experience.
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* 2) Portability. I wanted an implementation that I knew to be portable
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* to a reasonable number of platforms. In particular, the algorithm is
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* designed with little-endian platforms in mind, but I wanted an
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* endian-agnostic implementation.
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* 3) Compactness. While not an overriding goal, I thought it worth-while
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* to see if I could reduce the overall size of the result. This is in
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* keeping with my hopes that this library will be suitable for use in
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* some embedded environments.
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* Beyond that, cleanliness and clarity are always worth pursuing.
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*
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* As mentioned above, the code really only makes sense if you are familiar
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* with the MD5 algorithm or are using RFC 1321 as a guide. This code is
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* quirky, however, so you'll want to be reading carefully.
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*
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* Yeah...most of the comments are cut-and-paste from my MD4 implementation.
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*
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* -------------------------------------------------------------------------- **
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*
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* References:
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* IETF RFC 1321: The MD5 Message-Digest Algorithm
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* Ron Rivest. IETF, April, 1992
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*
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* ========================================================================== **
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*/
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/* -------------------------------------------------------------------------- **
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* Typedefs:
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*/
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typedef struct
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{
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unsigned int len;
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unsigned int ABCD[4];
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int b_used;
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unsigned char block[64];
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} auth_md5Ctx;
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/* -------------------------------------------------------------------------- **
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* Functions:
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*/
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auth_md5Ctx *auth_md5InitCtx( auth_md5Ctx *ctx );
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/* ------------------------------------------------------------------------ **
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* Initialize an MD5 context.
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*
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* Input: ctx - A pointer to the MD5 context structure to be initialized.
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* Contexts are typically created thusly:
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* ctx = (auth_md5Ctx *)malloc( sizeof(auth_md5Ctx) );
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*
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* Output: A pointer to the initialized context (same as <ctx>).
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*
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* Notes: The purpose of the context is to make it possible to generate
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* an MD5 Message Digest in stages, rather than having to pass a
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* single large block to a single MD5 function. The context
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* structure keeps track of various bits of state information.
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*
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* Once the context is initialized, the blocks of message data
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* are passed to the <auth_md5SumCtx()> function. Once the
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* final bit of data has been handed to <auth_md5SumCtx()> the
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* context can be closed out by calling <auth_md5CloseCtx()>,
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* which also calculates the final MD5 result.
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*
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* Don't forget to free an allocated context structure when
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* you've finished using it.
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*
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* See Also: <auth_md5SumCtx()>, <auth_md5CloseCtx()>
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*
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* ------------------------------------------------------------------------ **
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*/
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auth_md5Ctx *auth_md5SumCtx( auth_md5Ctx *ctx,
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const unsigned char *src,
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const int len );
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/* ------------------------------------------------------------------------ **
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* Build an MD5 Message Digest within the given context.
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*
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* Input: ctx - Pointer to the context in which the MD5 sum is being
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* built.
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* src - A chunk of source data. This will be used to drive
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* the MD5 algorithm.
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* len - The number of bytes in <src>.
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*
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* Output: A pointer to the updated context (same as <ctx>).
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*
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* See Also: <auth_md5InitCtx()>, <auth_md5CloseCtx()>, <auth_md5Sum()>
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*
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* ------------------------------------------------------------------------ **
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*/
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auth_md5Ctx *auth_md5CloseCtx( auth_md5Ctx *ctx, unsigned char *dst );
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/* ------------------------------------------------------------------------ **
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* Close an MD5 Message Digest context and generate the final MD5 sum.
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*
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* Input: ctx - Pointer to the context in which the MD5 sum is being
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* built.
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* dst - A pointer to at least 16 bytes of memory, which will
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* receive the finished MD5 sum.
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*
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* Output: A pointer to the closed context (same as <ctx>).
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* You might use this to free a malloc'd context structure. :)
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*
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* Notes: The context (<ctx>) is returned in an undefined state.
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* It must be re-initialized before re-use.
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*
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* See Also: <auth_md5InitCtx()>, <auth_md5SumCtx()>
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*
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* ------------------------------------------------------------------------ **
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*/
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unsigned char * MD5( unsigned char * hash, const unsigned char *src, const int len );
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/* ------------------------------------------------------------------------ **
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* Compute an MD5 message digest.
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*
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* Input: dst - Destination buffer into which the result will be written.
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* Must be 16 bytes, minimum.
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* src - Source data block to be MD5'd.
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* len - The length, in bytes, of the source block.
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* (Note that the length is given in bytes, not bits.)
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*
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* Output: A pointer to <dst>, which will contain the calculated 16-byte
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* MD5 message digest.
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*
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* Notes: This function is a shortcut. It takes a single input block.
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* For more drawn-out operations, see <auth_md5InitCtx()>.
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*
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* This function is interface-compatible with the
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* <auth_md4Sum()> function in the MD4 module.
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*
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* The MD5 algorithm is designed to work on data with an
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* arbitrary *bit* length. Most implementations, this one
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* included, handle the input data in byte-sized chunks.
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*
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* The MD5 algorithm does much of its work using four-byte
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* words, and so can be tuned for speed based on the endian-ness
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* of the host. This implementation is intended to be
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* endian-neutral, which may make it a teeny bit slower than
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* others. ...maybe.
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*
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* See Also: <auth_md5InitCtx()>
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*
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* ------------------------------------------------------------------------ **
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*/
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unsigned char * MD5fromFile( unsigned char *dst, const char *src );
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/* ------------------------------------------------------------------------ **
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* Compute an MD5 message digest.
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*
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* Input: dst - Destination buffer into which the result will be written.
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* Must be 16 bytes, minimum.
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* src - filepath to the file to be MD5'd.
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*
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* Output: A pointer to <dst>, which will contain the calculated 16-byte
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* MD5 message digest.
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*
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* Notes: This function is a shortcut. It takes a single input block.
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* For more drawn-out operations, see <auth_md5InitCtx()>.
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*
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* This function is interface-compatible with the
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* <auth_md4Sum()> function in the MD4 module.
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*
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* The MD5 algorithm is designed to work on data with an
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* arbitrary *bit* length. Most implementations, this one
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* included, handle the input data in byte-sized chunks.
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*
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* The MD5 algorithm does much of its work using four-byte
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* words, and so can be tuned for speed based on the endian-ness
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* of the host. This implementation is intended to be
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* endian-neutral, which may make it a teeny bit slower than
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* others. ...maybe.
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*
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* See Also: <auth_md5InitCtx()>
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*
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* ------------------------------------------------------------------------ **
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*/
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const char * MD5ToString( const unsigned char *hash, char *dst );
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unsigned char * StringToMD5( const char * hash, unsigned char * dst );
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/* ========================================================================== */
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#ifdef __cplusplus
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}
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#endif
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#endif /* AUTH_MD5_H */
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