diff --git a/tools/tf_fuzz/utility/compute.cpp b/tools/tf_fuzz/utility/compute.cpp
new file mode 100644
index 0000000..708a1f3
--- /dev/null
+++ b/tools/tf_fuzz/utility/compute.cpp
@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2019-2020, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ */
+
+#include <cstdint>  // for uint32_t
+#include "compute.hpp"
+
+
+using namespace std;
+
+/**********************************************************************************
+   Methods of class crc32 follow:
+**********************************************************************************/
+
+crc32::crc32 (void)
+{
+    shift_reg = 0x55555555;  // just give it some default value
+}
+
+void crc32::seed_lfsr (uint32_t init_value)
+{
+    shift_reg = init_value;
+}
+
+/* lfsr_1b() performs one shift of the LFSR, factoring in a single bit of info,
+   that single bit must be in the low-order bit of the parameter.  It returns
+   the LFSR value, which may be ignored. */
+uint32_t crc32::lfsr_1b (uint32_t a_bit)
+{
+    bool odd;
+
+    odd = ((shift_reg ^ a_bit) & 1) == 1;
+    shift_reg >>= 1;
+    if (odd) {
+        shift_reg ^= polynomial;
+    }
+    if (shift_reg == 0) {
+        // Theoretically should never happen, but precaution...
+        seed_lfsr (0x55555555);
+    }
+    return shift_reg;
+}
+
+uint32_t crc32::crc (uint8_t a_byte)
+{
+    for (int i = 0;  i < 8;  i++) {
+        lfsr_1b ((uint32_t) a_byte);
+        a_byte >>= 1;
+    }
+    return shift_reg;
+}
+
+uint32_t crc32::crc (uint16_t a_halfword)
+{
+    for (int i = 0;  i < 16;  i++) {
+        lfsr_1b ((uint32_t) a_halfword);
+        a_halfword >>= 1;
+    }
+    return shift_reg;
+}
+
+uint32_t crc32::crc (uint32_t a_word)
+{
+    for (int i = 0;  i < 32;  i++) {
+        lfsr_1b ((uint32_t) a_word);
+        a_word >>= 1;
+    }
+    return shift_reg;
+}
+
+/**********************************************************************************
+   End of methods of class crc32.
+**********************************************************************************/