From ed1fb0f0a9aaa1030c68090680b638fc50caa964 Mon Sep 17 00:00:00 2001
From: hasufell <hasufell@hasufell.de>
Date: Thu, 17 Apr 2014 17:34:48 +0200
Subject: [PATCH] POLY: add erase_polynom() function

---
 src/poly.c | 14 ++++++++++++++
 src/poly.h |  2 ++
 2 files changed, 16 insertions(+)

diff --git a/src/poly.c b/src/poly.c
index a1894a0..7d5934c 100644
--- a/src/poly.c
+++ b/src/poly.c
@@ -134,6 +134,20 @@ pb_poly *build_polynom(int const * const c,
 	return new_poly;
 }
 
+/**
+ * Sets all the polynomial coefficients to +0.
+ *
+ * @param poly the polynomial
+ * @param len the length of the polynomial
+ */
+void erase_polynom(pb_poly *poly, size_t len)
+{
+	for (unsigned int i = 0; i < len ; i++) {
+		mp_set(&(poly->terms[i]), 0);
+		mp_abs(&(poly->terms[i]), &(poly->terms[i]));
+	}
+}
+
 /**
  * This deletes the internal structure of a polynomial,
  * and frees the pointer. Don't call this on stack variables,
diff --git a/src/poly.h b/src/poly.h
index c3edab1..3f95e37 100644
--- a/src/poly.h
+++ b/src/poly.h
@@ -126,6 +126,8 @@ pb_poly *build_polynom(int const * const c,
 		const size_t len,
 		ntru_context *ctx);
 
+void erase_polynom(pb_poly *poly, size_t len);
+
 void delete_polynom(pb_poly *new_poly);
 
 void pb_starmultiply(pb_poly *a,