diff --git a/tests/suites/test_suite_cipher.function b/tests/suites/test_suite_cipher.function
index f842045..01b3f2c 100644
--- a/tests/suites/test_suite_cipher.function
+++ b/tests/suites/test_suite_cipher.function
@@ -63,6 +63,9 @@
                     key_bitlen == 192 ||
                     key_bitlen == 256);
     }
+    TEST_LE_U(key_bitlen, MBEDTLS_MAX_KEY_LENGTH * 8);
+    TEST_LE_U(block_size, MBEDTLS_MAX_BLOCK_LENGTH);
+    TEST_LE_U(iv_size, MBEDTLS_MAX_IV_LENGTH);
 
     if (strstr(info->name, "-ECB") != NULL) {
         TEST_ASSERT(iv_size == 0);
diff --git a/tests/suites/test_suite_cmac.function b/tests/suites/test_suite_cmac.function
index 9624e8f..4597550 100644
--- a/tests/suites/test_suite_cmac.function
+++ b/tests/suites/test_suite_cmac.function
@@ -111,6 +111,8 @@
 
     TEST_ASSERT((cipher_info = mbedtls_cipher_info_from_type(cipher_type))
                 != NULL);
+    TEST_LE_U(mbedtls_cipher_info_get_block_size(cipher_info),
+              MBEDTLS_CIPHER_BLKSIZE_MAX);
 
     memset(buf, 0x2A, sizeof(buf));
     TEST_ASSERT((result == mbedtls_cipher_cmac(cipher_info, key, key_size,