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Commit	Line	Data
	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
	33	using std::string;
	34	using std::min;
	35
	36	class MD5Summation;
	37
	38	class MD5SumValue
	39	{
	40	friend class MD5Summation;
	41	unsigned char Sum[4*4];
	42
	43	public:
	44
	45	// Accessors
	46	bool operator ==(const MD5SumValue &rhs) const;
	47	string Value() const;
	48	inline void Value(unsigned char S[16])
	49	{for (int I = 0; I != sizeof(Sum); I++) S[I] = Sum[I];};
	50	inline operator string() const {return Value();};
	51	bool Set(string Str);
	52	inline void Set(unsigned char S[16])
	53	{for (int I = 0; I != sizeof(Sum); I++) Sum[I] = S[I];};
	54
	55	MD5SumValue(string Str);
	56	MD5SumValue();
	57	};
	58
	59	class MD5Summation
	60	{
	61	unsigned char Buf[4*4];
	62	unsigned char Bytes[2*4];
	63	unsigned char In[16*4];
	64	bool Done;
	65
	66	public:
	67
	68	bool Add(const unsigned char *Data,unsigned long Size);
	69	inline bool Add(const char Data) {return Add((unsigned char )Data,strlen(Data));};
	70	bool AddFD(int Fd,unsigned long Size);
	71	inline bool Add(const unsigned char Beg,const unsigned char End)
	72	{return Add(Beg,End-Beg);};
	73	MD5SumValue Result();
	74
	75	MD5Summation();
	76	};
	77
	78	#endif