apt-pkg/contrib/hashes.h

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: hashes.h,v 1.2 2001/03/11 05:30:20 jgg Exp $
   4 /* ######################################################################
   5
   6    Hashes - Simple wrapper around the hash functions
   7
   8    This is just used to make building the methods simpler, this is the
   9    only interface required..
  10
  11    ##################################################################### */
  12                                                                         /*}}}*/
  13 #ifndef APTPKG_HASHES_H
  14 #define APTPKG_HASHES_H
  15
  16
  17 #include <apt-pkg/md5.h>
  18 #include <apt-pkg/sha1.h>
  19 #include <apt-pkg/sha2.h>
  20 #include <apt-pkg/fileutl.h>
  21
  22 #include <algorithm>
  23 #include <vector>
  24 #include <cstring>
  25
  26
  27 #ifndef APT_8_CLEANER_HEADERS
  28 using std::min;
  29 using std::vector;
  30 #endif
  31
  32 // helper class that contains hash function name
  33 // and hash
  34 class HashString
  35 {
  36  protected:
  37    std::string Type;
  38    std::string Hash;
  39    static const char* _SupportedHashes[10];
  40
  41    // internal helper
  42    std::string GetHashForFile(std::string filename) const;
  43
  44  public:
  45    HashString(std::string Type, std::string Hash);
  46    HashString(std::string StringedHashString);  // init from str as "type:hash"
  47    HashString();
  48
  49    // get hash type used
  50    std::string HashType() { return Type; };
  51
  52    // verify the given filename against the currently loaded hash
  53    bool VerifyFile(std::string filename) const;
  54
  55    // generate a hash string from the given filename
  56    bool FromFile(std::string filename);
  57
  58
  59    // helper
  60    std::string toStr() const;                    // convert to str as "type:hash"
  61    bool empty() const;
  62
  63    // return the list of hashes we support
  64    static const char** SupportedHashes();
  65 };
  66
  67 class Hashes
  68 {
  69    public:
  70
  71    MD5Summation MD5;
  72    SHA1Summation SHA1;
  73    SHA256Summation SHA256;
  74    SHA512Summation SHA512;
  75
  76    inline bool Add(const unsigned char *Data,unsigned long long Size)
  77    {
  78       return MD5.Add(Data,Size) && SHA1.Add(Data,Size) && SHA256.Add(Data,Size) && SHA512.Add(Data,Size);
  79    };
  80    inline bool Add(const char *Data) {return Add((unsigned char *)Data,strlen(Data));};
  81    inline bool AddFD(int const Fd,unsigned long long Size = 0)
  82    { return AddFD(Fd, Size, true, true, true, true); };
  83    bool AddFD(int const Fd, unsigned long long Size, bool const addMD5,
  84               bool const addSHA1, bool const addSHA256, bool const addSHA512);
  85    inline bool AddFD(FileFd &Fd,unsigned long long Size = 0)
  86    { return AddFD(Fd, Size, true, true, true, true); };
  87    bool AddFD(FileFd &Fd, unsigned long long Size, bool const addMD5,
  88               bool const addSHA1, bool const addSHA256, bool const addSHA512);
  89    inline bool Add(const unsigned char *Beg,const unsigned char *End)
  90                   {return Add(Beg,End-Beg);};
  91 };
  92
  93 #endif