1 /*
2 * Adler32
3 * (C) 1999-2007 Jack Lloyd
4 *
5 * Distributed under the terms of the Botan license
6 */
7 
8 #ifndef BOTAN_ADLER32_H__
9 #define BOTAN_ADLER32_H__
10 
11 #include <botan/hash.h>
12 
13 namespace Botan {
14 
15 /**
16 * The Adler32 checksum, used in zlib
17 */
18 class BOTAN_DLL Adler32 : public HashFunction
19    {
20    public:
name()21       std::string name() const { return "Adler32"; }
output_length()22       size_t output_length() const { return 4; }
clone()23       HashFunction* clone() const { return new Adler32; }
24 
clear()25       void clear() { S1 = 1; S2 = 0; }
26 
Adler32()27       Adler32() { clear(); }
~Adler32()28       ~Adler32() { clear(); }
29    private:
30       void add_data(const byte[], size_t);
31       void final_result(byte[]);
32       u16bit S1, S2;
33    };
34 
35 }
36 
37 #endif
38