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 <algorithm>
  19
  20 using std::string;
  21 using std::min;
  22
  23 class SHA256Summation;
  24
  25 class SHA256SumValue
  26 {
  27    friend class SHA256Summation;
  28    unsigned char Sum[32];
  29
  30    public:
  31
  32    // Accessors
  33    bool operator ==(const SHA256SumValue &rhs) const;
  34    string Value() const;
  35    inline void Value(unsigned char S[32])
  36          {for (int I = 0; I != sizeof(Sum); I++) S[I] = Sum[I];};
  37    inline operator string() const {return Value();};
  38    bool Set(string Str);
  39    inline void Set(unsigned char S[32])
  40          {for (int I = 0; I != sizeof(Sum); I++) Sum[I] = S[I];};
  41
  42    SHA256SumValue(string Str);
  43    SHA256SumValue();
  44 };
  45
  46 struct sha256_ctx {
  47     uint32_t count[2];
  48     uint32_t state[8];
  49     uint8_t buf[128];
  50 };
  51
  52 class SHA256Summation
  53 {
  54    struct sha256_ctx Sum;
  55
  56    bool Done;
  57
  58    public:
  59
  60    bool Add(const unsigned char *inbuf,unsigned long inlen);
  61    inline bool Add(const char *Data) {return Add((unsigned char *)Data,strlen(Data));};
  62    bool AddFD(int Fd,unsigned long Size);
  63    inline bool Add(const unsigned char *Beg,const unsigned char *End)
  64                   {return Add(Beg,End-Beg);};
  65    SHA256SumValue Result();
  66
  67    SHA256Summation();
  68 };
  69
  70 #endif