diff --git a/tests/suites/test_suite_constant_time.data b/tests/suites/test_suite_constant_time.data
index 785bdec..02b62f7 100644
--- a/tests/suites/test_suite_constant_time.data
+++ b/tests/suites/test_suite_constant_time.data
@@ -702,3 +702,69 @@
 
 mbedtls_ct_memmove_left 16 16
 mbedtls_ct_memmove_left:16:16
+
+mbedtls_ct_memcmp_partial -1 0 0 0
+mbedtls_ct_memcmp_partial:-1:0:0:0:0
+
+mbedtls_ct_memcmp_partial 0 1 0 0
+mbedtls_ct_memcmp_partial:0:1:0:0:1
+
+mbedtls_ct_memcmp_partial 0 1 1 0
+mbedtls_ct_memcmp_partial:0:1:1:0:0
+
+mbedtls_ct_memcmp_partial 0 1 0 1
+mbedtls_ct_memcmp_partial:0:1:0:1:0
+
+mbedtls_ct_memcmp_partial -1 1 0 0
+mbedtls_ct_memcmp_partial:-1:1:0:0:0
+
+mbedtls_ct_memcmp_partial 0 2 0 1
+mbedtls_ct_memcmp_partial:0:2:0:1:1
+
+mbedtls_ct_memcmp_partial 0 2 1 0
+mbedtls_ct_memcmp_partial:0:2:1:0:0
+
+mbedtls_ct_memcmp_partial 0 16 4 4
+mbedtls_ct_memcmp_partial:0:16:4:4:0
+
+mbedtls_ct_memcmp_partial 2 16 4 4
+mbedtls_ct_memcmp_partial:2:16:4:4:0
+
+mbedtls_ct_memcmp_partial 3 16 4 4
+mbedtls_ct_memcmp_partial:3:16:4:4:0
+
+mbedtls_ct_memcmp_partial 4 16 4 4
+mbedtls_ct_memcmp_partial:4:16:4:4:1
+
+mbedtls_ct_memcmp_partial 7 16 4 4
+mbedtls_ct_memcmp_partial:7:16:4:4:1
+
+mbedtls_ct_memcmp_partial 11 16 4 4
+mbedtls_ct_memcmp_partial:11:16:4:4:1
+
+mbedtls_ct_memcmp_partial 12 16 4 4
+mbedtls_ct_memcmp_partial:12:16:4:4:0
+
+mbedtls_ct_memcmp_partial 15 16 4 4
+mbedtls_ct_memcmp_partial:15:16:4:4:0
+
+mbedtls_ct_memcmp_partial 15 16 4 0
+mbedtls_ct_memcmp_partial:15:16:4:0:1
+
+mbedtls_ct_memcmp_partial 15 16 0 4
+mbedtls_ct_memcmp_partial:15:16:0:4:0
+
+mbedtls_ct_memcmp_partial 0 16 0 0
+mbedtls_ct_memcmp_partial:0:16:0:0:1
+
+mbedtls_ct_memcmp_partial 15 16 0 0
+mbedtls_ct_memcmp_partial:15:16:0:0:1
+
+mbedtls_ct_memcmp_partial -1 16 0 0
+mbedtls_ct_memcmp_partial:-1:16:0:0:0
+
+mbedtls_ct_memcmp_partial -1 16 12 4
+mbedtls_ct_memcmp_partial:-1:16:12:4:0
+
+mbedtls_ct_memcmp_partial -1 16 8 8
+mbedtls_ct_memcmp_partial:-1:16:8:8:0
diff --git a/tests/suites/test_suite_constant_time.function b/tests/suites/test_suite_constant_time.function
index 5dbba06..d80610f 100644
--- a/tests/suites/test_suite_constant_time.function
+++ b/tests/suites/test_suite_constant_time.function
@@ -259,6 +259,44 @@
 }
 /* END_CASE */
 
+/* BEGIN_CASE depends_on:MBEDTLS_NIST_KW_C */
+void mbedtls_ct_memcmp_partial(int diff, int size, int skip_head, int skip_tail, int expected)
+{
+    uint8_t *a = NULL, *b = NULL;
+    TEST_CALLOC(a, size + 1); // + 1 to avoid NULL result from TEST_CALLOC(0)
+    TEST_CALLOC(b, size + 1);
+
+    TEST_ASSERT((skip_head + skip_tail) <= size);
+
+    /* Construct data that matches, except for specified byte (if in range). */
+    for (int i = 0; i < size; i++) {
+        a[i] = i & 0xff;
+        if (i != diff) {
+            b[i] = a[i];
+        } else {
+            b[i] = (i + 1) & 0xff;
+        }
+    }
+
+    int reference = memcmp(a + skip_head, b + skip_head, size - skip_head - skip_tail);
+
+    TEST_CF_SECRET(a, size);
+    TEST_CF_SECRET(b, size);
+
+    int actual = mbedtls_ct_memcmp_partial(a, b, size, skip_head, skip_tail);
+
+    TEST_CF_PUBLIC(a, size);
+    TEST_CF_PUBLIC(b, size);
+    TEST_CF_PUBLIC(&actual, sizeof(actual));
+
+    TEST_EQUAL(!!reference, !!actual);
+    TEST_EQUAL(!!expected, !!actual);
+exit:
+    mbedtls_free(a);
+    mbedtls_free(b);
+}
+/* END_CASE */
+
 /* BEGIN_CASE */
 void mbedtls_ct_memcpy_if(int eq, int size, int offset)
 {