apt-pkg/contrib/sha256.h

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: sha1.h,v 1.3 2001/05/07 05:05:47 jgg Exp $
   4 /* ######################################################################
   5
   6    SHA256SumValue - Storage for a SHA-256 hash.
   7    SHA256Summation - SHA-256 Secure Hash Algorithm.
   8
   9    This is a C++ interface to a set of SHA256Sum functions, that mirrors
  10    the equivalent MD5 & SHA1 classes.
  11
  12    ##################################################################### */
  13                                                                         /*}}}*/
  14 #ifndef APTPKG_SHA256_H
  15 #define APTPKG_SHA256_H
  16
  17 #include <string>
  18 #include <cstring>
  19 #include <algorithm>
  20 #include <stdint.h>
  21
  22 using std::string;
  23 using std::min;
  24
  25 class SHA256Summation;
  26
  27 class SHA256SumValue
  28 {
  29    friend class SHA256Summation;
  30    unsigned char Sum[32];
  31
  32    public:
  33
  34    // Accessors
  35    bool operator ==(const SHA256SumValue &rhs) const;
  36    string Value() const;
  37    inline void Value(unsigned char S[32])
  38          {for (int I = 0; I != sizeof(Sum); I++) S[I] = Sum[I];};
  39    inline operator string() const {return Value();};
  40    bool Set(string Str);
  41    inline void Set(unsigned char S[32])
  42          {for (int I = 0; I != sizeof(Sum); I++) Sum[I] = S[I];};
  43
  44    SHA256SumValue(string Str);
  45    SHA256SumValue();
  46 };
  47
  48 struct sha256_ctx {
  49     uint32_t count[2];
  50     uint32_t state[8];
  51     uint8_t buf[128];
  52 };
  53
  54 class SHA256Summation
  55 {
  56    struct sha256_ctx Sum;
  57
  58    bool Done;
  59
  60    public:
  61
  62    bool Add(const unsigned char *inbuf,unsigned long inlen);
  63    inline bool Add(const char *Data) {return Add((unsigned char *)Data,strlen(Data));};
  64    bool AddFD(int Fd,unsigned long Size);
  65    inline bool Add(const unsigned char *Beg,const unsigned char *End)
  66                   {return Add(Beg,End-Beg);};
  67    SHA256SumValue Result();
  68
  69    SHA256Summation();
  70 };
  71
  72 #endif