From 5e14e11c3c21c7bd04b156f1df8e8c866509bc4a Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@anytun.org>
Date: Wed, 20 Feb 2008 13:53:17 +0000
Subject: cleanups key derivation could work now

---
 mpi.cpp | 54 +++++++++++++++++++++++++++++-------------------------
 1 file changed, 29 insertions(+), 25 deletions(-)

(limited to 'mpi.cpp')

diff --git a/mpi.cpp b/mpi.cpp
index 39e3408..18a3349 100644
--- a/mpi.cpp
+++ b/mpi.cpp
@@ -68,7 +68,7 @@ void Mpi::operator=(const Mpi &src)
   val_ = gcry_mpi_copy(src.val_);
 }
 
-void Mpi::operator=(const long unsigned int src)
+void Mpi::operator=(const u_int32_t src)
 {
   gcry_mpi_set_ui(val_, src);
 }
@@ -80,48 +80,44 @@ Mpi Mpi::operator+(const Mpi &b) const
   return res;
 }
 
-Mpi Mpi::operator+(const long unsigned int &b) const
+Mpi Mpi::operator+(const u_int32_t &b) const
 {
   Mpi res;
   gcry_mpi_add_ui(res.val_, val_, b);
   return res;
 }
 
-Mpi Mpi::operator*(const unsigned long int n) const
+Mpi Mpi::operator*(const u_int32_t n) const
 {
   Mpi res;
   gcry_mpi_mul_ui(res.val_, val_, n);
   return res;
 }
 
-//TODO: this is outstandingly ugly!!!!!!!!
-Mpi Mpi::operator^(const Mpi &b) const
+Mpi Mpi::operator/(const Mpi &b) const
 {
-  u_int32_t a_len=0, b_len=0;
   Mpi res;
+  gcry_mpi_div(res.val_, NULL, val_, b.val_, 0);
+  return res;
+}
 
-  a_len = gcry_mpi_get_nbits(val_);
-  b_len = gcry_mpi_get_nbits(b.val_);
+//TODO: this is outstandingly ugly!!!!!!!!
+Mpi Mpi::operator^(const Mpi &b) const
+{
+  u_int32_t a_len = gcry_mpi_get_nbits(val_);
+  u_int32_t b_len = gcry_mpi_get_nbits(b.val_);
 
-  if(a_len>=b_len)
-    res = Mpi(*this);
-  else
-    res = Mpi(b);
+  Mpi res = (a_len >= b_len) ? Mpi(*this) : Mpi(b);
 
   for(u_int32_t i=0; i<a_len && i<b_len; i++) {
     if(gcry_mpi_test_bit(val_, i) ^ gcry_mpi_test_bit(b.val_, i))
       gcry_mpi_set_bit(res.val_, i);
+    else
+      gcry_mpi_clear_bit(res.val_, i);
   }
   return res;
 }
 
-// bit manipulation
-
-void Mpi::rShift(u_int8_t n)
-{
-  gcry_mpi_rshift(val_, val_, n);
-}
-
 Mpi Mpi::mul2exp(u_int32_t e) const
 {
   Mpi res;
@@ -129,11 +125,6 @@ Mpi Mpi::mul2exp(u_int32_t e) const
   return res;
 }
 
-void Mpi::clearHighBit(u_int32_t n)
-{
-  gcry_mpi_clear_highbit( val_, n );
-}
-
 u_int8_t* Mpi::getNewBuf(u_int32_t buf_len) const
 {
   // u_int32_t len = 0;
@@ -153,7 +144,20 @@ u_int8_t* Mpi::getNewBuf(u_int32_t buf_len) const
   return res;
 }
 
-u_int32_t Mpi::getLen() const
+//TODO: why does this not work ?????
+std::string Mpi::getHexDump() const
+{
+//   u_int8_t *buf;
+//   u_int32_t len;
+//   gcry_mpi_aprint( GCRYMPI_FMT_HEX, &buf, &len, val_ );
+//   std::string res(buf, len);
+  
+  gcry_mpi_dump( val_ );
+  std::string res("\n");
+  return res;
+}
+
+u_int32_t Mpi::getLength() const
 {
   return gcry_mpi_get_nbits( val_ );
 }
-- 
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