md5 and sorting improvments

1 files changed, 106 insertions, 0 deletions

diff --git a/src/crypto.c b/src/crypto.c
new file mode 100644
index 0000000..92ae475
--- /dev/null
+++ b/src/crypto.c
@@ -0,0 +1,106 @@
+#include "crypto.h"
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+static const uint32_t K[] = {0xd76aa478,
+            0xe8c7b756, 0x242070db, 0xc1bdceee, 0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
+            0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be, 0x6b901122, 0xfd987193, 0xa679438e,
+            0x49b40821, 0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, 0xd62f105d, 0x2441453,
+            0xd8a1e681, 0xe7d3fbc8, 0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, 0xa9e3e905,
+            0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a, 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
+            0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70, 0x289b7ec6, 0xeaa127fa, 0xd4ef3085,
+            0x4881d05, 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665, 0xf4292244, 0x432aff97,
+            0xab9423a7, 0xfc93a039, 0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1, 0x6fa87e4f,
+            0xfe2ce6e0, 0xa3014314, 0x4e0811a1, 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d39};
+static const uint32_t s[] = {7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22,
+            5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20,
+            4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23,
+            6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21};
+
+int l_md5(lua_State* L){
+  uint32_t a0 = 0x67452301;
+  uint32_t b0 = 0xefcdab89;
+  uint32_t c0 = 0x98badcfe;
+  uint32_t d0 = 0x10325476;
+
+  int len = 0;
+  char* ww = "wowa";
+  uint8_t* a = (uint8_t*)luaL_checklstring(L, 1, NULL);
+  for(int i = 0; a[i]!='\0'; i++) len++;
+  
+  int tlen = ((((len + 8) /64) + 1) * 64) - 8;
+
+  uint8_t* b = NULL;
+  b = calloc(tlen + 64, 1);
+
+  memcpy(b, a, len);
+  b[len] = 0x80;
+
+  //add padding
+  uint32_t lhhh = 8*len;
+  memcpy(b + tlen, &lhhh, 4);
+
+  
+  for(int z = 0; z < tlen; z+=(512/8)){
+    uint32_t* M = (uint32_t *) (b + z); 
+
+    uint32_t A = a0;
+    uint32_t B = b0;
+    uint32_t C = c0;
+    uint32_t D = d0;
+
+    for(int i = 0; i < 64; i++){
+      uint32_t F, g;
+      
+      if(i < 16){
+        F = (B & C) | ((~B) & D);
+        g = i; 
+      } else if(i < 32){
+        F = (D & B) | ((~D) & C);
+        g = (5*i + 1) % 16;
+      } else if(i < 48){
+        F = B ^ C ^ D;
+        g = (3*i + 5) % 16;
+      } else {
+        F = C ^ (B | (~D));
+        g = (7*i) % 16;
+      }
+ 
+
+
+      F = F + A + K[i] + M[g];
+
+      uint32_t temp = D; 
+      D = C;
+      C = B;
+      B = B + (F << s[i] | (F >> (32 - s[i])));
+      A = temp;
+    }
+
+    a0 += A;
+    b0 += B;
+    c0 += C;
+    d0 += D;
+
+  }
+  char ou[64];
+  uint8_t *p; 
+  p=(uint8_t *)&a0;
+  sprintf(ou,"%2.2x%2.2x%2.2x%2.2x", p[0], p[1], p[2], p[3]);
+ 
+  p=(uint8_t *)&b0;
+  sprintf(ou,"%s%2.2x%2.2x%2.2x%2.2x", ou, p[0], p[1], p[2], p[3]);
+ 
+  p=(uint8_t *)&c0;
+  sprintf(ou,"%s%2.2x%2.2x%2.2x%2.2x", ou, p[0], p[1], p[2], p[3]);
+ 
+  p=(uint8_t *)&d0;
+  sprintf(ou,"%s%2.2x%2.2x%2.2x%2.2x", ou, p[0], p[1], p[2], p[3]);
+
+  lua_pushstring(L, ou);
+
+  free(b);
+
+  return 1;
+};
+