Add mbedtls_mpi_core_ct_uint_table_lookup tests

Signed-off-by: Janos Follath <janos.follath@arm.com>

tests/suites/test_suite_bignum_core.function

@@ -941,3 +941,40 @@ exit:
     mbedtls_mpi_free( &RR_REF );
 }
 /* END_CASE */
+
+/* BEGIN_CASE */
+void mpi_core_ct_uint_table_lookup( int bitlen, int window_size )
+{
+    size_t limbs = BITS_TO_LIMBS( bitlen );
+    size_t count = ( (size_t) 1 ) << window_size;
+
+    mbedtls_mpi_uint *table = NULL;
+    ASSERT_ALLOC( table, limbs * count );
+
+    mbedtls_mpi_uint *dest = NULL;
+    ASSERT_ALLOC( dest, limbs );
+
+    /*
+     * Fill the table with a unique counter so that differences are easily
+     * detected. (And have their relationship to the index relatively non-trivial just
+     * to be sure.)
+     */
+    for( size_t i = 0; i < count * limbs; i++ )
+    {
+        table[i] = ~i - 1;
+    }
+
+    for( size_t i = 0; i < count; i++ )
+    {
+        memset( dest, 0x00, limbs * sizeof( *dest ) );
+        mbedtls_mpi_core_ct_uint_table_lookup( dest, table, limbs, count, i );
+
+        mbedtls_mpi_uint *current = table + i * limbs;
+        ASSERT_COMPARE( dest, limbs * sizeof( *dest ),
+                        current, limbs * sizeof( *current ) );
+    }
+
+exit:
+    ;
+}
+/* END_CASE */