Add tests for _gej_cmov

Author: peterdettman

src/tests.c

@@ -100,6 +100,12 @@ void random_group_element_jacobian_test(secp256k1_gej *gej, const secp256k1_ge *
     gej->infinity = ge->infinity;
 }
 
+void random_gej_test(secp256k1_gej *gej) {
+    secp256k1_ge ge;
+    random_group_element_test(&ge);
+    random_group_element_jacobian_test(gej, &ge);
+}
+
 void random_scalar_order_test(secp256k1_scalar *num) {
     do {
         unsigned char b32[32];
@@ -3338,6 +3344,37 @@ void run_ge(void) {
     test_intialized_inf();
 }
 
+void test_gej_cmov(const secp256k1_gej *a, const secp256k1_gej *b) {
+    secp256k1_gej t = *a;
+    secp256k1_gej_cmov(&t, b, 0);
+    CHECK(gej_xyz_equals_gej(&t, a));
+    secp256k1_gej_cmov(&t, b, 1);
+    CHECK(gej_xyz_equals_gej(&t, b));
+}
+
+void run_gej(void) {
+    int i;
+    secp256k1_gej a, b;
+
+    /* Tests for secp256k1_gej_cmov */
+    for (i = 0; i < count; i++) {
+        secp256k1_gej_set_infinity(&a);
+        secp256k1_gej_set_infinity(&b);
+        test_gej_cmov(&a, &b);
+
+        random_gej_test(&a);
+        test_gej_cmov(&a, &b);
+        test_gej_cmov(&b, &a);
+
+        b = a;
+        test_gej_cmov(&a, &b);
+
+        random_gej_test(&b);
+        test_gej_cmov(&a, &b);
+        test_gej_cmov(&b, &a);
+    }
+}
+
 void test_ec_combine(void) {
     secp256k1_scalar sum = SECP256K1_SCALAR_CONST(0, 0, 0, 0, 0, 0, 0, 0);
     secp256k1_pubkey data[6];
@@ -6805,6 +6842,7 @@ int main(int argc, char **argv) {
 
     /* group tests */
     run_ge();
+    run_gej();
     run_group_decompress();
 
     /* ecmult tests */