From bbcd3dff79a3fffafd8c4f5fdf30738c7117b8ae Mon Sep 17 00:00:00 2001
From: Dennis Brentjes <dennis@brentj.es>
Date: Mon, 29 Feb 2016 16:51:52 +0100
Subject: First commit with the first homework assignment.

---
 assignment1/exercise1_1.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 assignment1/exercise1_1.c

(limited to 'assignment1/exercise1_1.c')

diff --git a/assignment1/exercise1_1.c b/assignment1/exercise1_1.c
new file mode 100644
index 0000000..e1dd810
--- /dev/null
+++ b/assignment1/exercise1_1.c
@@ -0,0 +1,33 @@
+#include <stdint.h>
+#include <stdio.h>
+
+uint32_t modexp(uint32_t a, unsigned char e[4])
+{
+  /* TODO: implement */
+}
+
+/* Pipe output through sage */
+#define NTESTS 20
+int main(void)
+{
+  FILE *urandom = fopen("/dev/urandom", "r");
+  uint32_t a,r,ei;
+  unsigned char e[4];
+  int i,j;
+
+  for(i=0;i<NTESTS;i++)
+  {
+    fread(&a,sizeof(uint32_t),1,urandom);
+    fread(e,sizeof(unsigned char),4,urandom);
+    r = modexp(a,e);
+
+    ei = 0;
+    for(j=0;j<4;j++)
+      ei |= (uint32_t)e[j] << 8*j;
+
+    printf("power_mod(%u,%u,2^32) - %u\n", a,ei,r);
+  }
+
+  fclose(urandom);
+  return 0;
+}
-- 
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