tons of checksums (i had fun:3)

1 files changed, 30 insertions, 0 deletions

diff --git a/src/hash/bsdchecksum.c b/src/hash/bsdchecksum.c
new file mode 100644
index 0000000..1c69497
--- /dev/null
+++ b/src/hash/bsdchecksum.c
@@ -0,0 +1,30 @@
+#include "../crypto.h"
+#include <stdio.h>
+#include <stdint.h>
+
+
+uint16_t i_bsdchecksum(uint8_t *aa, size_t len){
+    uint16_t check = 0x0;
+    
+    for(int i = 0; i != len; i++){
+        uint8_t a = aa[i];
+        check = (check >> 1) + ((check & 1) << 15);
+        check += a;
+        check &= 0xffff;
+    }
+    return check;
+}
+
+int l_bsdchecksum(lua_State* L){
+  
+  size_t len = 0;
+  uint8_t* a = (uint8_t*)luaL_checklstring(L, 1, &len);
+  
+  char digest[16];
+
+  uint16_t u = i_bsdchecksum(a, len);
+  sprintf(digest,"%x",u);
+  lua_pushstring(L, digest);
+
+  return 1;
+}