apt-pkg/contrib/sha2.cc

   1 /*
   2  * Cryptographic API.                                                   {{{
   3  *
   4  * SHA-512, as specified in
   5  * http://csrc.nist.gov/cryptval/shs/sha256-384-512.pdf
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the Free
   9  * Software Foundation; either version 2 of the License, or (at your option)
  10  * any later version.
  11  *
  12  */                                                                     /*}}}*/
  13
  14 #ifdef __GNUG__
  15 #pragma implementation "apt-pkg/sha2.h"
  16 #endif
  17
  18 #include <apt-pkg/sha2.h>
  19 #include <apt-pkg/strutl.h>
  20
  21 // SHA2Summation::AddFD - Add content of file into the checksum      /*{{{*/
  22 // ---------------------------------------------------------------------
  23 /* */
  24 bool SHA2SummationBase::AddFD(int Fd,unsigned long Size){
  25    unsigned char Buf[64 * 64];
  26    int Res = 0;
  27    int ToEOF = (Size == 0);
  28    while (Size != 0 || ToEOF)
  29    {
  30       unsigned n = sizeof(Buf);
  31       if (!ToEOF) n = min(Size,(unsigned long)n);
  32       Res = read(Fd,Buf,n);
  33       if (Res < 0 || (!ToEOF && (unsigned) Res != n)) // error, or short read
  34          return false;
  35       if (ToEOF && Res == 0) // EOF
  36          break;
  37       Size -= Res;
  38       Add(Buf,Res);
  39    }
  40    return true;
  41 }
  42                                                                        /*}}}*/
  43