DOC: fix doxygen comments

Interestingly, the results and tests work with both variants.
However, this one is correct and matches the algorithm given in
NTRU Cryptosystems Tech Report #014.

.travis.yml

@@ -4,6 +4,7 @@ env:
     global:
         secure: "BB9eiRNXC1PfNRLEifc0yQQZnM25zqaWNGVWN+atzT+NkxhVKyVr8+DoyPYaa8tOKybuSZhVkKnIiCd8iGMe3v+WyuHKFuhdiwdnEQhxbBlUCb9dDLEexI+J8QiYwC8AW/t6H9LWVwSka0RI3GJujJ8HKIBzW45I/j+1NlUte8U="
 before_script:
+    - export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:"/usr/local/lib"
     - sudo apt-get install -qq libgmp-dev libmpfr-dev doxygen graphviz cmake libcunit1 libcunit1-dev
     - sudo apt-get remove doxygen
     - wget http://www.flintlib.org/flint-2.4.3.tar.gz

README.md

@@ -10,12 +10,18 @@ implementation with the primary goal of learning.
 * FLINT (compiled with gmp and mpfr)
 * glib-2.0
 * lz4 (https://code.google.com/p/lz4)
+* cunit (for the tests only)
+* doxygen (for the documentation only)
 * pkgconfig (for the build only)
 
 ### Compiling the library
 
 Run ```make``` to build.
 
+### Running the tests
+
+Run ```make check``` to run the test suite.
+
 ### Installing the library
 
 Run ```make install``` to install.

include/doxygen.dox

@@ -32,10 +32,13 @@ This library was written for Linux systems. Support for windows will not be adde
 	\* <a href="http://www.flintlib.org">FLINT-2.4.3 or later</a> (compiled with gmp and mpfr)
 	\* <a href="https://developer.gnome.org/glib/stable/">glib-2.0</a>
 	\* <a href="https://code.google.com/p/lz4">lz4</a>
+	\* <a href="http://cunit.sourceforge.net">cunit</a> (for the tests only)
+	\* <a href="http://www.doxygen.org">doxygen</a> (for the documentation only)
 	\* <a href="http://www.freedesktop.org/wiki/Software/pkg-config/">pkg-config</a> (for the build only)
 
 \section install_sec Installation
 	\* make
+	\* make check (optional, runs the test suite)
 	\* make install
 
 \section usage Usage

include/ntru_keypair.h

@@ -73,11 +73,11 @@ struct keypair {
  * @param pair store private and public components here (the
  * polynomials inside the struct will be automatically
  * initialized) [out]
- * @param f a random polynomial
- * @param g a random polynomial
+ * @param f a random ternary polynomial
+ * @param g a random ternary polynomial
  * @param params the NTRU context
  * @return true for success, false if f or g are not invertible
- * (then the caller hast to try different ones)
+ * (then the caller has to try different ones)
  */
 bool
 ntru_create_keypair(

src/doxygen.dox

@@ -22,10 +22,13 @@ This library was written for Linux systems. Support for windows will not be adde
 	\* <a href="http://www.flintlib.org">FLINT-2.4.3 or later</a> (compiled with gmp and mpfr)
 	\* <a href="https://developer.gnome.org/glib/stable/">glib-2.0</a>
 	\* <a href="https://code.google.com/p/lz4">lz4</a>
+	\* <a href="http://cunit.sourceforge.net">cunit</a> (for the tests only)
+	\* <a href="http://www.doxygen.org">doxygen</a> (for the documentation only)
 	\* <a href="http://www.freedesktop.org/wiki/Software/pkg-config/">pkg-config</a> (for the build only)
 
 \section install_sec Installation
 	\* make
+	\* make check (optional, runs the test suite)
 	\* make install
 
 \section usage Usage

src/ntru_keypair.h

@@ -70,11 +70,11 @@ struct keypair {
  * @param pair store private and public components here (the
  * polynomials inside the struct will be automatically
  * initialized) [out]
- * @param f a random polynomial
- * @param g a random polynomial
+ * @param f a random ternary polynomial
+ * @param g a random ternary polynomial
  * @param params the NTRU context
  * @return true for success, false if f or g are not invertible
- * (then the caller hast to try different ones)
+ * (then the caller has to try different ones)
  */
 bool
 ntru_create_keypair(

src/ntru_poly.c

@@ -509,12 +509,12 @@ poly_inverse_poly_p(fmpz_poly_t Fp,
 
 			/* f = f - u * g mod p */
 			fmpz_poly_scalar_mul_fmpz(g_tmp, g_tmp, u);
-			fmpz_poly_sub(f, g_tmp, f);
+			fmpz_poly_sub(f, f, g_tmp);
 			fmpz_poly_mod_unsigned(f, params->p);
 
 			/* b = b - u * c mod p */
 			fmpz_poly_scalar_mul_fmpz(c_tmp, c_tmp, u);
-			fmpz_poly_sub(b, c_tmp, b);
+			fmpz_poly_sub(b, b, c_tmp);
 			fmpz_poly_mod_unsigned(b, params->p);
 
 			fmpz_clear(u);

src/ntru_poly.h

@@ -183,7 +183,7 @@ poly_starmultiply(fmpz_poly_t c,
 /**
  * Compute the inverse of a polynomial in modulo a power of 2,
  * which is q. This is based off the pseudo-code for "Inversion
- * in (Z/2Z)[X](X^N - 1)" and "Inversion in (Z/p^r Z)[X](X^N - 1)".
+ * in (Z/2Z)[X]/(X^N - 1)" and "Inversion in (Z/p^r Z)[X](X^N - 1)".
  * See NTRU Cryptosystems Tech Report #014 "Almost Inverses
  * and Fast NTRU Key Creation."
  *

src/ntru_rnd.c

@@ -25,7 +25,6 @@
  * @brief random polynomials
  */
 
-#include "math.h"
 #include "ntru_err.h"
 #include "ntru_params.h"
 #include "ntru_poly.h"

tests/Makefile

@@ -44,4 +44,4 @@ clean:
 	rm -f *.o ntru_cunit *.orig core test-file.out pub.key
 
 
-.PHONY: check clean test
+.PHONY: check clean libpqc.a test

tests/ntru_poly_cunit.c

@@ -71,5 +71,5 @@ void test_poly_new2(void)
 
 	poly_new(new_poly, NULL, 0);
 
-	CU_ASSERT_PTR_NULL(fmpz_poly_get_coeff_ptr(new_poly, 0));
+	CU_ASSERT_EQUAL(fmpz_poly_is_zero(new_poly), 1);
 }