/[dtapublic]/projs/trunk/shared_source/c_datd/esrg_md5.h
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Sat Oct 29 01:53:01 2016 UTC (6 years, 3 months ago) by dashley
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1 //$Header$
2 //-------------------------------------------------------------------------------------------------
3 //This file is part of "David T. Ashley's Shared Source Code", a set of shared components
4 //integrated into many of David T. Ashley's projects.
5 //-------------------------------------------------------------------------------------------------
6 //This source code and any program in which it is compiled/used is provided under the MIT License,
7 //reproduced below.
8 //-------------------------------------------------------------------------------------------------
9 //Permission is hereby granted, free of charge, to any person obtaining a copy of
10 //this software and associated documentation files(the "Software"), to deal in the
11 //Software without restriction, including without limitation the rights to use,
12 //copy, modify, merge, publish, distribute, sublicense, and / or sell copies of the
13 //Software, and to permit persons to whom the Software is furnished to do so,
14 //subject to the following conditions :
15 //
16 //The above copyright notice and this permission notice shall be included in all
17 //copies or substantial portions of the Software.
18 //
19 //THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 //IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 //FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
22 //AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23 //LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
24 //OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
25 //SOFTWARE.
26 //-------------------------------------------------------------------------------------------------
27 #ifndef ESRG_MD5_H_INCLUDED
28 #define ESRG_MD5_H_INCLUDED
29
30 #ifdef MODULE_ESRG_MD5
31 #define DECMOD_ESRG_MD5
32 #else
33 #define DECMOD_ESRG_MD5 extern
34 #endif
35
36 //Fundamental state (or RFC 1321 calls it context) for forming
37 //MD5s. Conceptually private to this module.
38 struct ESRG_MD5_Md5StateStruct
39 {
40 unsigned A, B, C, D;
41 //Directly from RFC 1321.
42 unsigned __int64 bit_count;
43 //The count of bits processed thus far. The algorithm here
44 //works in bytes, not bits, so this is advanced by 8 on
45 //each byte processed.
46 unsigned X[16];
47 //These are the words corresponding to the chars. We don't
48 //dare union them because of big-endian/little-endian concerns.
49 //The name "X" comes directly from RFC 1321 nomenclature.
50 unsigned char buf[64];
51 //We can't proceed to execute a round unless we have the
52 //full 512 bits = 16 words = 64 bytes of data. We must
53 //buffer it because we can't count on being called with data
54 //blocks that are a multiple of 64. We may have data hanging
55 //around between calls. We fill up this buffer from the low
56 //end, i.e. [0], then [1], then [2], etc.
57 };
58
59 //Result structure, used to hold result. Caller is allowed to
60 //pick it apart.
61 struct ESRG_MD5_Md5ResultStruct
62 {
63 unsigned md5_words[4];
64 char md5_chars[33];
65 //Zero terminated string containing MD5 formed.
66 };
67
68 //Initializes the MD5 calculation structure.
69 DECMOD_ESRG_MD5
70 void ESRG_MD5_Md5StateStructOpen(struct ESRG_MD5_Md5StateStruct *arg);
71
72 //Adds data to it. Zero length is OK.
73 DECMOD_ESRG_MD5
74 void ESRG_MD5_Md5StateStructAddData(struct ESRG_MD5_Md5StateStruct *arg,
75 void *data,
76 unsigned len);
77
78 //Closes the structure and returns the MD5. This is destructive--one cannot
79 //continue adding characters. All characters returned are lower-case.
80 DECMOD_ESRG_MD5
81 void ESRG_MD5_Md5StateStructClose(struct ESRG_MD5_Md5StateStruct *state,
82 struct ESRG_MD5_Md5ResultStruct *result);
83
84 //Returns version control information.
85 DECMOD_ESRG_MD5 const char *ESRG_MD5_cvcinfo(void);
86 DECMOD_ESRG_MD5 const char *ESRG_MD5_hvcinfo(void);
87
88 //Definition of the version of the H file, used for providing version control
89 //information to external callers.
90 #define ESRG_MD5_H_VERSION ("$Header$")
91
92 #endif
93
94 //End of esrg_md5.h.

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