diff --git a/djb2.c b/djb2.c
new file mode 100644
index 0000000..a468f97
--- /dev/null
+++ b/djb2.c
@@ -0,0 +1,22 @@
+#include <stdio.h>
+
+unsigned long djb2(const char *str) {
+    unsigned long h = 5381;
+    int c;
+
+    while ((c = *str++)) {
+        h = ((h << 5) + h) + c;
+
+        // Essentially equal to:
+        // h = h * 33 + c;
+    }
+
+    return h;
+}
+
+int main(void) {
+    char *a = "ABC";
+    printf("Hash: %ld\n", djb2(a));
+
+    return 0;
+}