From 70b995d30a4c75869c4223dbb931802246f52d94 Mon Sep 17 00:00:00 2001
From: couturie <couturie@extinction>
Date: Mon, 25 Sep 2017 09:26:52 +0200
Subject: [PATCH] new

---
 IDA/test_mat2.cpp | 41 +++++++++++++++++++++++++++++++++++++++--
 1 file changed, 39 insertions(+), 2 deletions(-)

diff --git a/IDA/test_mat2.cpp b/IDA/test_mat2.cpp
index e61ecac..e09acbd 100644
--- a/IDA/test_mat2.cpp
+++ b/IDA/test_mat2.cpp
@@ -158,6 +158,38 @@ void buildFullRankIDA(Cube<byte>& IDAmat, Cube<short> &invIDAmat, int q, int n,
   cout<<invIDAmat<<endl;
 }
 
+void buildKRankIDA(Cube<byte>& IDAmat, int q, int n, int k, byte* DK) {
+
+  byte Sbox[256];
+  byte RM1[q*n*k];
+ 
+  
+  rc4key(DK, Sbox, 8);
+  prga(Sbox, q*n*k, RM1);
+  Cube<byte> rm1(RM1,1,1,q*n*k);
+  rm1.reshape(n,k,q);
+  
+  cout<<"rm1"<<endl;
+  cout<<rm1<<endl;
+
+
+  
+
+//  Construction of the IDA matrices
+  for(int i=0;i<q;i++) {
+    Mat<byte> sub(n,k);
+    sub.submat(0,0,n-1,k-1)=rm1.slice(i);
+ 
+
+    IDAmat.slice(i)=sub;
+
+
+  }
+  cout<<IDAmat<<endl;
+
+}
+
+
 
 int main( int argc, char *argv[] ) {
 
@@ -203,12 +235,17 @@ int main( int argc, char *argv[] ) {
 
 
 
-
+/*
 // Initialization of IDA and inverse IDA matrix
   Cube<byte> IDAmat(n,n,q);
   Cube<short> invIDAmat(n,n,q);
   buildFullRankIDA(IDAmat, invIDAmat, q, n, &DK[0]);
-  
+*/
+
+
+
+  Cube<byte> IDAmat(n,k,q);
+  buildKRankIDA(Cube<byte>& IDAmat, q, n, k, &DK[0]);
 
   // rc4key(&DK[8], sc, 16);
   
-- 
2.39.5