diff --git a/tests/suites/test_suite_chacha20.data b/tests/suites/test_suite_chacha20.data
index 8609460..3f9033e 100644
--- a/tests/suites/test_suite_chacha20.data
+++ b/tests/suites/test_suite_chacha20.data
@@ -22,5 +22,8 @@
 ChaCha20 RFC 7539 Test Vector #3 (Decrypt)
 chacha20_crypt:"1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cbc207075c0":"000000000000000000000002":42:"62e6347f95ed87a45ffae7426f27a1df5fb69110044c0d73118effa95b01e5cf166d3df2d721caf9b21e5fb14c616871fd84c54f9d65b283196c7fe4f60553ebf39c6402c42234e32a356b3e764312a61a5532055716ead6962568f87d3f3f7704c6a8d1bcd1bf4d50d6154b6da731b187b58dfd728afa36757a797ac188d1":"2754776173206272696c6c69672c20616e642074686520736c6974687920746f7665730a446964206779726520616e642067696d626c6520696e2074686520776162653a0a416c6c206d696d737920776572652074686520626f726f676f7665732c0a416e6420746865206d6f6d65207261746873206f757467726162652e"
 
+ChaCha20 Paremeter Validation
+chacha20_bad_params:
+
 ChaCha20 Selftest
 chacha20_self_test:
diff --git a/tests/suites/test_suite_chacha20.function b/tests/suites/test_suite_chacha20.function
index 124e510..669d91e 100644
--- a/tests/suites/test_suite_chacha20.function
+++ b/tests/suites/test_suite_chacha20.function
@@ -82,6 +82,56 @@
 }
 /* END_CASE */
 
+/* BEGIN_CASE */
+void chacha20_bad_params()
+{
+    unsigned char key[32];
+    unsigned char nonce[12];
+    unsigned char src[1];
+    unsigned char dst[1];
+    uint32_t counter = 0;
+    size_t len = sizeof( src );
+    mbedtls_chacha20_context ctx;
+
+    mbedtls_chacha20_init( NULL );
+    mbedtls_chacha20_free( NULL );
+
+    mbedtls_chacha20_init( &ctx );
+
+    TEST_ASSERT( mbedtls_chacha20_setkey( NULL, key )
+                 == MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chacha20_setkey( &ctx, NULL )
+                 == MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
+
+    TEST_ASSERT( mbedtls_chacha20_starts( NULL, nonce, counter )
+                 == MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chacha20_starts( &ctx, NULL, counter )
+                 == MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
+
+    TEST_ASSERT( mbedtls_chacha20_update( NULL, 0, src, dst )
+                 == MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chacha20_update( &ctx, len, NULL, dst )
+                 == MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chacha20_update( &ctx, len, src, NULL )
+                 == MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chacha20_update( &ctx, 0, NULL, NULL )
+                 == 0 );
+
+    mbedtls_chacha20_free( &ctx );
+
+    TEST_ASSERT( mbedtls_chacha20_crypt( NULL, nonce, counter, 0, src, dst )
+                 == MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chacha20_crypt( key, NULL, counter, 0, src, dst )
+                 == MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chacha20_crypt( key, nonce, counter, len, NULL, dst )
+                 == MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chacha20_crypt( key, nonce, counter, len, src, NULL )
+                 == MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chacha20_crypt( key, nonce, counter, 0, NULL, NULL )
+                 == 0 );
+}
+/* END_CASE */
+
 /* BEGIN_CASE depends_on:MBEDTLS_SELF_TEST */
 void chacha20_self_test()
 {