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use a simpler seed for the random number generator

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git-svn-id: svn+q:///qpdf/trunk@821 71b93d88-0707-0410-a8cf-f5a4172ac649
This commit is contained in:
Jay Berkenbilt 2009-10-18 16:03:10 +00:00
parent 34097d6c64
commit f0211d954c
1 changed files with 4 additions and 12 deletions
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16
libqpdf/Pl_AES_PDF.cc
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@ -1,6 +1,5 @@
#include <qpdf/Pl_AES_PDF.hh>
#include <qpdf/QUtil.hh>
#include <qpdf/MD5.hh>
#include <cstring>
#include <assert.h>
#include <stdexcept>
@ -111,17 +110,10 @@ Pl_AES_PDF::initializeVector()
static bool seeded_random = false;
if (! seeded_random)
{
std::string seed_str;
seed_str += QUtil::int_to_string((int)QUtil::get_current_time());
seed_str += " QPDF aes random";
MD5 m;
m.encodeString(seed_str.c_str());
MD5::Digest digest;
m.digest(digest);
assert(sizeof(digest) >= sizeof(unsigned int));
unsigned int seed;
memcpy((void*)(&seed), digest, sizeof(unsigned int));
srandom(seed);
// Seed the random number generator with something simple, but
// just to be interesting, don't use the unmodified current
// time....
srandom((int)QUtil::get_current_time() ^ 0xcccc);
seeded_random = true;
}
for (unsigned int i = 0; i < this->buf_size; ++i)