From f2b4183c688b57fec4848ffebfd4c9e9a03e5fdd Mon Sep 17 00:00:00 2001
From: hasufell <hasufell@hasufell.de>
Date: Wed, 30 Apr 2014 17:19:58 +0200
Subject: [PATCH] POLY: add pb_mp_mul()

---
 src/poly.c | 23 +++++++++++++++++++++++
 src/poly.h | 10 ++++++++++
 2 files changed, 33 insertions(+)

diff --git a/src/poly.c b/src/poly.c
index c60b24b..66b6898 100644
--- a/src/poly.c
+++ b/src/poly.c
@@ -270,6 +270,29 @@ void pb_starmultiply(pb_poly *a,
 	delete_polynom(a_tmp);
 }
 
+/**
+ * Calculate c = a * b where c and a are polynomials
+ * and b is an mp_int.
+ *
+ * @param a polynom
+ * @param b mp_int
+ * @param c polynom [out]
+ * @return error code of pb_mul()
+ */
+int pb_mp_mul(pb_poly *a, mp_int *b, pb_poly *c)
+{
+	int result;
+
+	pb_poly *b_poly = build_polynom(NULL, 1);
+	MP_COPY(b, &(b_poly->terms[0]));
+	printf("u converted to poly: "); draw_polynom(b_poly);
+	result = pb_mul(a, b_poly, c);
+
+	delete_polynom(b_poly);
+
+	return result;
+}
+
 /**
  * c = a XOR b
  *
diff --git a/src/poly.h b/src/poly.h
index 20132cb..b8589a6 100644
--- a/src/poly.h
+++ b/src/poly.h
@@ -135,6 +135,14 @@ unsigned int get_degree(pb_poly const * const poly);
 				mp_error_to_string(result)); \
 }
 
+#define PB_MP_MUL(...) \
+{ \
+	int result; \
+	if ((result = pb_mp_mul(__VA_ARGS__)) != MP_OKAY) \
+			NTRU_ABORT("Error multiplying polynomial with mp_int. %s", \
+				mp_error_to_string(result)); \
+}
+
 #define PB_ADD(...) \
 { \
 	int result; \
@@ -187,6 +195,8 @@ void pb_starmultiply(pb_poly *a,
 		ntru_context *ctx,
 		unsigned int modulus);
 
+int pb_mp_mul(pb_poly *a, mp_int *b, pb_poly *c);
+
 void pb_xor(pb_poly *a,
 		pb_poly *b,
 		pb_poly *c,