From 7eb07ccdca178abffe5ffccf686b4f818db3601d Mon Sep 17 00:00:00 2001
From: ame <amelia@amyy.cc>
Date: Fri, 17 Nov 2023 10:10:47 -0600
Subject: tons of hashes bleh

---
 src/hash/fnv.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 src/hash/fnv.c

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

diff --git a/src/hash/fnv.c b/src/hash/fnv.c
new file mode 100644
index 0000000..1fc4d0a
--- /dev/null
+++ b/src/hash/fnv.c
@@ -0,0 +1,62 @@
+#include "../i_util.h"
+#include "../crypto.h"
+#include <stdio.h>
+#include <stdint.h>
+
+
+uint64_t fnv_1(uint8_t* in, size_t len, enum fnv_version A){
+    uint64_t hash = (A != v_0) * 0xcbf29ce484222325;
+    uint64_t prime = 0x100000001b3;
+
+    for(int i = 0; i != len; i++){
+        switch(A){
+            case v_1:
+            case v_0:
+                hash *= prime;
+                hash ^= in[i];
+                break;
+            case v_a:
+                hash ^= in[i];
+                hash *= prime;
+                break;
+        }
+    }
+
+    return hash;
+}
+
+int l_fnv_0(lua_State* L){ 
+  size_t len = 0;
+  uint8_t* a = (uint8_t*)luaL_checklstring(L, 1, &len);
+
+  char digest[64];
+
+  uint64_t u = fnv_1(a, len, v_0);
+  sprintf(digest,"%08lx",u);
+  lua_pushstring(L, digest);
+  return 1;
+}
+
+int l_fnv_1(lua_State* L){ 
+  size_t len = 0;
+  uint8_t* a = (uint8_t*)luaL_checklstring(L, 1, &len);
+
+  char digest[64];
+
+  uint64_t u = fnv_1(a, len, v_1);
+  sprintf(digest,"%08lx",u);
+  lua_pushstring(L, digest);
+  return 1;
+}
+
+int l_fnv_a(lua_State* L){ 
+  size_t len = 0;
+  uint8_t* a = (uint8_t*)luaL_checklstring(L, 1, &len);
+
+  char digest[64];
+
+  uint64_t u = fnv_1(a, len, v_a);
+  sprintf(digest,"%08lx",u);
+  lua_pushstring(L, digest);
+  return 1;
+}
-- 
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