diff --git a/tests/suites/test_suite_des.data b/tests/suites/test_suite_des.data
index a317bae..7291649 100644
--- a/tests/suites/test_suite_des.data
+++ b/tests/suites/test_suite_des.data
@@ -232,5 +232,8 @@
 3DES-CBC 3Key Encrypt (Invalid input length)
 des3_encrypt_cbc:3:"0123456789abcdeff1e0d3c2b5a49786fedcba9876543210":"fedcba9876543210":"37363534333231204E6F77206973207468652074696D65":"":POLARSSL_ERR_DES_INVALID_INPUT_LENGTH
 
+Run through parity bit tests
+des_key_parity_run:
+
 DES Selftest
 des_selftest:
diff --git a/tests/suites/test_suite_des.function b/tests/suites/test_suite_des.function
index 59458b8..ab957a6 100644
--- a/tests/suites/test_suite_des.function
+++ b/tests/suites/test_suite_des.function
@@ -255,6 +255,49 @@
 END_CASE
 
 BEGIN_CASE
+des_key_parity_run:
+{
+    int i, j, cnt;
+    unsigned char key[DES_KEY_SIZE];
+    unsigned int parity;
+
+    memset( key, 0, DES_KEY_SIZE );
+    cnt = 0;
+
+    // Iterate through all possible byte values
+    //
+    for( i = 0; i < 32; i++ )
+    {
+        for( j = 0; j < 8; j++ )
+            key[j] = cnt++;
+
+        // Set the key parity according to the table
+        //
+        des_key_set_parity( key );
+
+        // Check the parity with a function
+        //
+        for( j = 0; j < 8; j++ )
+        {
+            parity = key[j] ^ ( key[j] >> 4 );
+            parity = parity ^
+                    ( parity >> 1 ) ^
+                    ( parity >> 2 ) ^
+                    ( parity >> 3 );
+            parity &= 1;
+
+            if( parity != 1 )
+                TEST_ASSERT( 0 );
+        }
+
+        // Check the parity with the table
+        //
+        TEST_ASSERT( des_key_check_key_parity( key ) == 0 );
+    }
+}
+END_CASE
+
+BEGIN_CASE
 des_selftest:
 {
     TEST_ASSERT( des_self_test( 0 ) == 0 );