diff --git a/tests/suites/test_suite_chachapoly.data b/tests/suites/test_suite_chachapoly.data
index f0b4a0d..b0eedea 100644
--- a/tests/suites/test_suite_chachapoly.data
+++ b/tests/suites/test_suite_chachapoly.data
@@ -1,27 +1,24 @@
 ChaCha20-Poly1305 RFC 7539 Example and Test Vector (Encrypt)
-depends_on:MBEDTLS_CHACHAPOLY_C
 mbedtls_chachapoly_enc:"808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9f":"070000004041424344454647":"50515253c0c1c2c3c4c5c6c7":"4c616469657320616e642047656e746c656d656e206f662074686520636c617373206f66202739393a204966204920636f756c64206f6666657220796f75206f6e6c79206f6e652074697020666f7220746865206675747572652c2073756e73637265656e20776f756c642062652069742e":"d31a8d34648e60db7b86afbc53ef7ec2a4aded51296e08fea9e2b5a736ee62d63dbea45e8ca9671282fafb69da92728b1a71de0a9e060b2905d6a5b67ecd3b3692ddbd7f2d778b8c9803aee328091b58fab324e4fad675945585808b4831d7bc3ff4def08e4b7a9de576d26586cec64b6116":"1ae10b594f09e26a7e902ecbd0600691"
 
 ChaCha20-Poly1305 RFC 7539 Example and Test Vector (Decrypt)
-depends_on:MBEDTLS_CHACHAPOLY_C
 mbedtls_chachapoly_dec:"808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9f":"070000004041424344454647":"50515253c0c1c2c3c4c5c6c7":"d31a8d34648e60db7b86afbc53ef7ec2a4aded51296e08fea9e2b5a736ee62d63dbea45e8ca9671282fafb69da92728b1a71de0a9e060b2905d6a5b67ecd3b3692ddbd7f2d778b8c9803aee328091b58fab324e4fad675945585808b4831d7bc3ff4def08e4b7a9de576d26586cec64b6116":"4c616469657320616e642047656e746c656d656e206f662074686520636c617373206f66202739393a204966204920636f756c64206f6666657220796f75206f6e6c79206f6e652074697020666f7220746865206675747572652c2073756e73637265656e20776f756c642062652069742e":"1ae10b594f09e26a7e902ecbd0600691":0
 
 ChaCha20-Poly1305 RFC 7539 Example and Test Vector (Decrypt, not authentic)
-depends_on:MBEDTLS_CHACHAPOLY_C
 mbedtls_chachapoly_dec:"808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9f":"070000004041424344454647":"50515253c0c1c2c3c4c5c6c7":"d31a8d34648e60db7b86afbc53ef7ec2a4aded51296e08fea9e2b5a736ee62d63dbea45e8ca9671282fafb69da92728b1a71de0a9e060b2905d6a5b67ecd3b3692ddbd7f2d778b8c9803aee328091b58fab324e4fad675945585808b4831d7bc3ff4def08e4b7a9de576d26586cec64b6116":"4c616469657320616e642047656e746c656d656e206f662074686520636c617373206f66202739393a204966204920636f756c64206f6666657220796f75206f6e6c79206f6e652074697020666f7220746865206675747572652c2073756e73637265656e20776f756c642062652069742e":"1ae10b594f09e26a7e902ecbd0600690":MBEDTLS_ERR_CHACHAPOLY_AUTH_FAILED
 
 ChaCha20-Poly1305 RFC 7539 Test Vector #1 (Encrypt)
-depends_on:MBEDTLS_CHACHAPOLY_C
 mbedtls_chachapoly_enc:"1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cbc207075c0":"000000000102030405060708":"f33388860000000000004e91":"496e7465726e65742d4472616674732061726520647261667420646f63756d656e74732076616c696420666f722061206d6178696d756d206f6620736978206d6f6e74687320616e64206d617920626520757064617465642c207265706c616365642c206f72206f62736f6c65746564206279206f7468657220646f63756d656e747320617420616e792074696d652e20497420697320696e617070726f70726961746520746f2075736520496e7465726e65742d447261667473206173207265666572656e6365206d6174657269616c206f7220746f2063697465207468656d206f74686572207468616e206173202fe2809c776f726b20696e2070726f67726573732e2fe2809d":"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":"eead9d67890cbb22392336fea1851f38"
 
 ChaCha20-Poly1305 RFC 7539 Test Vector #1 (Decrypt)
-depends_on:MBEDTLS_CHACHAPOLY_C
 mbedtls_chachapoly_dec:"1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cbc207075c0":"000000000102030405060708":"f33388860000000000004e91":"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":"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":"eead9d67890cbb22392336fea1851f38":0
 
 ChaCha20-Poly1305 RFC 7539 Test Vector #1 (Decrypt, not authentic)
-depends_on:MBEDTLS_CHACHAPOLY_C
 mbedtls_chachapoly_dec:"1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cbc207075c0":"000000000102030405060708":"f33388860000000000004e91":"64a0861575861af460f062c79be643bd5e805cfd345cf389f108670ac76c8cb24c6cfc18755d43eea09ee94e382d26b0bdb7b73c321b0100d4f03b7f355894cf332f830e710b97ce98c8a84abd0b948114ad176e008d33bd60f982b1ff37c8559797a06ef4f0ef61c186324e2b3506383606907b6a7c02b0f9f6157b53c867e4b9166c767b804d46a59b5216cde7a4e99040c5a40433225ee282a1b0a06c523eaf4534d7f83fa1155b0047718cbc546a0d072b04b3564eea1b422273f548271a0bb2316053fa76991955ebd63159434ecebb4e466dae5a1073a6727627097a1049e617d91d361094fa68f0ff77987130305beaba2eda04df997b714d6c6f2c29a6ad5cb4022b02709b":"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":"fead9d67890cbb22392336fea1851f38":MBEDTLS_ERR_CHACHAPOLY_AUTH_FAILED
 
+ChaCha20-Poly1305 Parameter Validation
+chachapoly_bad_params:
+
 ChaCha20-Poly1305 Selftest
-depends_on:MBEDTLS_CHACHAPOLY_C:MBEDTLS_SELF_TEST
+depends_on:MBEDTLS_SELF_TEST
 chachapoly_selftest:
diff --git a/tests/suites/test_suite_chachapoly.function b/tests/suites/test_suite_chachapoly.function
index a613870..3f8145a 100644
--- a/tests/suites/test_suite_chachapoly.function
+++ b/tests/suites/test_suite_chachapoly.function
@@ -46,13 +46,13 @@
 
     mbedtls_chachapoly_init( &ctx );
 
-    mbedtls_chachapoly_setkey( &ctx, key_str );
+    TEST_ASSERT( mbedtls_chachapoly_setkey( &ctx, key_str ) == 0 );
 
-    mbedtls_chachapoly_crypt_and_tag( &ctx,
+    TEST_ASSERT( mbedtls_chachapoly_crypt_and_tag( &ctx,
                                       MBEDTLS_CHACHAPOLY_ENCRYPT,
                                       input_len, nonce_str,
                                       aad_str, aad_len,
-                                      input_str, output, mac );
+                                      input_str, output, mac ) == 0 );
 
     TEST_ASSERT( memcmp( output_str, output, output_len ) == 0 );
     TEST_ASSERT( memcmp( mac_str, mac, 16U ) == 0 );
@@ -101,7 +101,7 @@
 
     mbedtls_chachapoly_init( &ctx );
 
-    mbedtls_chachapoly_setkey( &ctx, key_str );
+    TEST_ASSERT( mbedtls_chachapoly_setkey( &ctx, key_str ) == 0 );
 
     ret = mbedtls_chachapoly_auth_decrypt( &ctx,
                                            input_len, nonce_str,
@@ -119,6 +119,155 @@
 }
 /* END_CASE */
 
+/* BEGIN_CASE */
+void chachapoly_bad_params()
+{
+    unsigned char key[32];
+    unsigned char nonce[12];
+    unsigned char aad[1];
+    unsigned char input[1];
+    unsigned char output[1];
+    unsigned char mac[16];
+    size_t input_len = sizeof( input );
+    size_t aad_len = sizeof( aad );
+    mbedtls_chachapoly_context ctx;
+
+    memset( key,    0x00, sizeof( key ) );
+    memset( nonce,  0x00, sizeof( nonce ) );
+    memset( aad,    0x00, sizeof( aad ) );
+    memset( input,  0x00, sizeof( input ) );
+    memset( output, 0x00, sizeof( output ) );
+    memset( mac,    0x00, sizeof( mac ) );
+
+    mbedtls_chachapoly_init( NULL );
+    mbedtls_chachapoly_free( NULL );
+
+    mbedtls_chachapoly_init( &ctx );
+
+    TEST_ASSERT( mbedtls_chachapoly_setkey( NULL, key )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_setkey( &ctx, NULL )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+
+    TEST_ASSERT( mbedtls_chachapoly_crypt_and_tag( NULL,
+                                      MBEDTLS_CHACHAPOLY_ENCRYPT,
+                                      0, nonce,
+                                      aad, 0,
+                                      input, output, mac )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_crypt_and_tag( &ctx,
+                                      MBEDTLS_CHACHAPOLY_ENCRYPT,
+                                      0, NULL,
+                                      aad, 0,
+                                      input, output, mac )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_crypt_and_tag( &ctx,
+                                      MBEDTLS_CHACHAPOLY_ENCRYPT,
+                                      0, nonce,
+                                      NULL, aad_len,
+                                      input, output, mac )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_crypt_and_tag( &ctx,
+                                      MBEDTLS_CHACHAPOLY_ENCRYPT,
+                                      input_len, nonce,
+                                      aad, 0,
+                                      NULL, output, mac )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_crypt_and_tag( &ctx,
+                                      MBEDTLS_CHACHAPOLY_ENCRYPT,
+                                      input_len, nonce,
+                                      aad, 0,
+                                      input, NULL, mac )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_crypt_and_tag( &ctx,
+                                      MBEDTLS_CHACHAPOLY_ENCRYPT,
+                                      0, nonce,
+                                      aad, 0,
+                                      input, output, NULL )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+
+    TEST_ASSERT( mbedtls_chachapoly_auth_decrypt( NULL,
+                                           0, nonce,
+                                           aad, 0,
+                                           mac, input, output )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_auth_decrypt( &ctx,
+                                           0, NULL,
+                                           aad, 0,
+                                           mac, input, output )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_auth_decrypt( &ctx,
+                                           0, nonce,
+                                           NULL, aad_len,
+                                           mac, input, output )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_auth_decrypt( &ctx,
+                                           0, nonce,
+                                           aad, 0,
+                                           NULL, input, output )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_auth_decrypt( &ctx,
+                                           input_len, nonce,
+                                           aad, 0,
+                                           mac, NULL, output )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_auth_decrypt( &ctx,
+                                           input_len, nonce,
+                                           aad, 0,
+                                           mac, input, NULL )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+
+    TEST_ASSERT( mbedtls_chachapoly_crypt_and_tag( &ctx,
+                                      MBEDTLS_CHACHAPOLY_ENCRYPT,
+                                      0, nonce,
+                                      aad, aad_len,
+                                      NULL, NULL, mac )
+                 == 0 );
+    TEST_ASSERT( mbedtls_chachapoly_auth_decrypt( &ctx,
+                                           0, nonce,
+                                           aad, aad_len,
+                                           mac, NULL, NULL )
+                 == 0 );
+
+    TEST_ASSERT( mbedtls_chachapoly_crypt_and_tag( &ctx,
+                                      MBEDTLS_CHACHAPOLY_ENCRYPT,
+                                      input_len, nonce,
+                                      NULL, 0,
+                                      input, output, mac )
+                 == 0 );
+    TEST_ASSERT( mbedtls_chachapoly_auth_decrypt( &ctx,
+                                           input_len, nonce,
+                                           NULL, 0,
+                                           mac, input, output )
+                 == 0 );
+
+    TEST_ASSERT( mbedtls_chachapoly_starts( NULL, nonce, MBEDTLS_CHACHAPOLY_ENCRYPT )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_starts( &ctx, NULL, MBEDTLS_CHACHAPOLY_ENCRYPT )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+
+    TEST_ASSERT( mbedtls_chachapoly_update_aad( NULL, aad, aad_len )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_update_aad( &ctx, NULL, aad_len )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+
+    TEST_ASSERT( mbedtls_chachapoly_update( NULL, input_len, input, output )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_update( &ctx, input_len, NULL, output )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_update( &ctx, input_len, input, NULL )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+
+    TEST_ASSERT( mbedtls_chachapoly_finish( NULL, mac )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_finish( &ctx, NULL )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+
+exit:
+    mbedtls_chachapoly_free( &ctx );
+}
+/* END_CASE */
+
 /* BEGIN_CASE depends_on:MBEDTLS_SELF_TEST */
 void chachapoly_selftest()
 {