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