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1 // -*- mode: cpp; mode: fold -*-
2 // Description /*{{{*/
3 // $Id: md5.h,v 1.6 2001/05/07 05:06:52 jgg Exp $
4 /* ######################################################################
5
6 MD5SumValue - Storage for a MD5Sum
7 MD5Summation - MD5 Message Digest Algorithm.
8
9 This is a C++ interface to a set of MD5Sum functions. The class can
10 store a MD5Sum in 16 bytes of memory.
11
12 A MD5Sum is used to generate a (hopefully) unique 16 byte number for a
13 block of data. This can be used to gaurd against corruption of a file.
14 MD5 should not be used for tamper protection, use SHA or something more
15 secure.
16
17 There are two classes because computing a MD5 is not a continual
18 operation unless 64 byte blocks are used. Also the summation requires an
19 extra 18*4 bytes to operate.
20
21 ##################################################################### */
22 /*}}}*/
23 #ifndef APTPKG_MD5_H
24 #define APTPKG_MD5_H
25
26 #ifdef __GNUG__
27 #pragma interface "apt-pkg/md5.h"
28 #endif
29
30 #include <string>
31 #include <algorithm>
32 #include <stdint.h>
33
34 using std::string;
35 using std::min;
36
37 class MD5Summation;
38
39 class MD5SumValue
40 {
41 friend class MD5Summation;
42 unsigned char Sum[4*4];
43
44 public:
45
46 // Accessors
47 bool operator ==(const MD5SumValue &rhs) const;
48 string Value() const;
49 inline void Value(unsigned char S[16])
50 {for (int I = 0; I != sizeof(Sum); I++) S[I] = Sum[I];};
51 inline operator string() const {return Value();};
52 bool Set(string Str);
53 inline void Set(unsigned char S[16])
54 {for (int I = 0; I != sizeof(Sum); I++) Sum[I] = S[I];};
55
56 MD5SumValue(string Str);
57 MD5SumValue();
58 };
59
60 class MD5Summation
61 {
62 uint32_t Buf[4];
63 unsigned char Bytes[2*4];
64 unsigned char In[16*4];
65 bool Done;
66
67 public:
68
69 bool Add(const unsigned char *Data,unsigned long Size);
70 inline bool Add(const char *Data) {return Add((unsigned char *)Data,strlen(Data));};
71 bool AddFD(int Fd,unsigned long Size);
72 inline bool Add(const unsigned char *Beg,const unsigned char *End)
73 {return Add(Beg,End-Beg);};
74 MD5SumValue Result();
75
76 MD5Summation();
77 };
78
79 #endif