From 0e4aeb5ee6878c74f8116b0719a90e167d17c6b4 Mon Sep 17 00:00:00 2001
From: ame <amelia@amyy.cc>
Date: Fri, 3 Nov 2023 19:45:15 -0500
Subject: tons of checksums (i had fun:3)

---
 src/hash/sysvchecksum.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 src/hash/sysvchecksum.c

(limited to 'src/hash/sysvchecksum.c')

diff --git a/src/hash/sysvchecksum.c b/src/hash/sysvchecksum.c
new file mode 100644
index 0000000..a4ce824
--- /dev/null
+++ b/src/hash/sysvchecksum.c
@@ -0,0 +1,29 @@
+#include "../crypto.h"
+#include <stdio.h>
+#include <stdint.h>
+#include <math.h>
+
+uint32_t i_sysvchecksum(uint8_t *aa, size_t len){
+    uint32_t check = 0x0;
+    
+    for(int i = 0; i != len; i++){
+        check += aa[i];
+    }
+
+    uint32_t r = check % (int)pow(2,16) + (check % (int)pow(2,32)) / (int)pow(2,16);
+    return (r % (int)pow(2,16)) + r / (int)pow(2,16);
+}
+
+int l_sysvchecksum(lua_State* L){
+  
+  size_t len = 0;
+  uint8_t* a = (uint8_t*)luaL_checklstring(L, 1, &len);
+  
+  char digest[32];
+
+  uint32_t u = i_sysvchecksum(a, len);
+  sprintf(digest,"%x",u);
+  lua_pushstring(L, digest);
+
+  return 1;
+}
-- 
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