diff --git a/t/CMakeLists.txt b/t/CMakeLists.txt
index 8b418b7..5f50208 100644
--- a/t/CMakeLists.txt
+++ b/t/CMakeLists.txt
@@ -2,6 +2,7 @@ enable_testing()
 
 set(SRC_DIR "../src")
 
+add_executable("t_md5"          "t_md5.c"     "${SRC_DIR}/md5.c")
 add_executable("t_buf"          "t_buf.c"     "${SRC_DIR}/strlcpy.c" "${SRC_DIR}/buf.c")
 add_executable("t_cmd"          "t_cmd.c"     "${SRC_DIR}/strlcpy.c" "${SRC_DIR}/buf.c" "${SRC_DIR}/commands.c")
 add_executable("t_matches"      "t_matches.c" "${SRC_DIR}/strlcpy.c" "${SRC_DIR}/matches.c")
@@ -11,6 +12,7 @@ add_executable("t_config_param" "t_config_param.c" "${SRC_DIR}/strlcpy.c" "${SRC
 
 add_test("tests/f2b_buf_*"     "t_buf")
 add_test("tests/f2b_cmd_*"     "t_cmd")
+add_test("tests/f2b_md5_*"     "t_md5")
 add_test("tests/f2b_matches_*" "t_matches")
 add_test("tests/f2b_ipaddr_*"  "t_ipaddr")
 add_test("tests/f2b_statefile_*"  "t_statefile")
diff --git a/t/t_md5.c b/t/t_md5.c
new file mode 100644
index 0000000..0be25fa
--- /dev/null
+++ b/t/t_md5.c
@@ -0,0 +1,16 @@
+#include "../src/common.h"
+#include "../src/md5.h"
+
+int main() {
+  MD5_CTX md5;
+  char *sample = "098f6bcd4621d373cade4e832627b4f6"; // md5_hex("test")
+
+  memset(&md5, 0x0, sizeof(md5));
+
+  MD5Init(&md5);
+  MD5Update(&md5, (unsigned char *) "test", 4);
+  MD5Final(&md5);
+
+  assert(strcmp(md5.hexdigest, sample) == 0);
+  return 0;
+}