[wip] vendor in dependencies

1 files changed, 200 insertions, 0 deletions

diff --git a/vendor/md5/src/md5lib.c b/vendor/md5/src/md5lib.c
new file mode 100644
index 00000000..19abc85f
--- /dev/null
+++ b/vendor/md5/src/md5lib.c
@@ -0,0 +1,200 @@
+/**
+*  $Id: md5lib.c,v 1.10 2008/05/12 20:51:27 carregal Exp $
+*  Cryptographic and Hash functions for Lua
+*  @author  Roberto Ierusalimschy
+*/
+
+
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+#include <lua.h>
+#include <lauxlib.h>
+
+#include "md5.h"
+#include "compat-5.2.h"
+
+
+/**
+*  Hash function. Returns a hash for a given string.
+*  @param message: arbitrary binary string.
+*  @return  A 128-bit hash string.
+*/
+static int lmd5 (lua_State *L) {
+  char buff[16];
+  size_t l;
+  const char *message = luaL_checklstring(L, 1, &l);
+  md5(message, l, buff);
+  lua_pushlstring(L, buff, 16L);
+  return 1;
+}
+
+
+/**
+*  X-Or. Does a bit-a-bit exclusive-or of two strings.
+*  @param s1: arbitrary binary string.
+*  @param s2: arbitrary binary string with same length as s1.
+*  @return  a binary string with same length as s1 and s2,
+*   where each bit is the exclusive-or of the corresponding bits in s1-s2.
+*/
+static int ex_or (lua_State *L) {
+  size_t l1, l2;
+  const char *s1 = luaL_checklstring(L, 1, &l1);
+  const char *s2 = luaL_checklstring(L, 2, &l2);
+  luaL_Buffer b;
+  luaL_argcheck( L, l1 == l2, 2, "lengths must be equal" );
+  luaL_buffinit(L, &b);
+  while (l1--) luaL_addchar(&b, (*s1++)^(*s2++));
+  luaL_pushresult(&b);
+  return 1;
+}
+
+
+static void checkseed (lua_State *L) {
+  if (lua_isnone(L, 3)) {  /* no seed? */
+    time_t tm = time(NULL);  /* for `random' seed */
+    lua_pushlstring(L, (char *)&tm, sizeof(tm));
+  }
+}
+
+
+#define MAXKEY  256
+#define BLOCKSIZE       16
+
+
+
+static int initblock (lua_State *L, const char *seed, int lseed, char *block) {
+  size_t lkey;
+  const char *key = luaL_checklstring(L, 2, &lkey);
+  if (lkey > MAXKEY)
+    luaL_error(L, "key too long (> %d)", MAXKEY);
+  memset(block, 0, BLOCKSIZE);
+  memcpy(block, seed, lseed);
+  memcpy(block+BLOCKSIZE, key, lkey);
+  return (int)lkey+BLOCKSIZE;
+}
+
+
+static void codestream (lua_State *L, const char *msg, size_t lmsg,
+                                      char *block, int lblock) {
+  luaL_Buffer b;
+  luaL_buffinit(L, &b);
+  while (lmsg > 0) {
+    char code[BLOCKSIZE];
+    int i;
+    md5(block, lblock, code);
+    for (i=0; i<BLOCKSIZE && lmsg > 0; i++, lmsg--)
+      code[i] ^= *msg++;
+    luaL_addlstring(&b, code, i); 
+    memcpy(block, code, i); /* update seed */
+  }
+  luaL_pushresult(&b);
+}
+
+
+static void decodestream (lua_State *L, const char *cypher, size_t lcypher,
+                          char *block, int lblock) {
+  luaL_Buffer b;
+  luaL_buffinit(L, &b);
+  while (lcypher > 0) {
+    char code[BLOCKSIZE];
+    int i;
+    md5(block, lblock, code);  /* update seed */
+    for (i=0; i<BLOCKSIZE && lcypher > 0; i++, lcypher--)
+      code[i] ^= *cypher++;
+    luaL_addlstring(&b, code, i); 
+    memcpy(block, cypher-i, i);
+  }
+  luaL_pushresult(&b);
+}
+
+
+/**
+*  Encrypts a string. Uses the hash function md5 in CFB (Cipher-feedback
+*  mode).
+*  @param message: arbitrary binary string to be encrypted.
+*  @param key: arbitrary binary string to be used as a key.
+*  @param [seed]: optional arbitrary binary string to be used as a seed.
+*  if no seed is provided, the function uses the result of
+*  <code>time()</code> as a seed.  
+*  @return  The cyphertext (as a binary string).
+*/
+static int crypt (lua_State *L) {
+  size_t lmsg;
+  const char *msg = luaL_checklstring(L, 1, &lmsg);
+  size_t lseed;
+  const char *seed;
+  int lblock;
+  char block[BLOCKSIZE+MAXKEY];
+  checkseed(L);
+  seed = luaL_checklstring(L, 3, &lseed);
+  if (lseed > BLOCKSIZE)
+    luaL_error(L, "seed too long (> %d)", BLOCKSIZE);
+  /* put seed and seed length at the beginning of result */
+  block[0] = (char)lseed;
+  memcpy(block+1, seed, lseed);
+  lua_pushlstring(L, block, lseed+1);  /* to concat with result */
+  lblock = initblock(L, seed, lseed, block);
+  codestream(L, msg, lmsg, block, lblock);
+  lua_concat(L, 2);
+  return 1;
+}
+
+
+/**
+*  Decrypts a string. For any message, key, and seed, we have that
+*  <code>decrypt(crypt(msg, key, seed), key) == msg</code>.
+*  @param cyphertext: message to be decrypted (this must be the result of
+   a previous call to <code>crypt</code>.
+*  @param key: arbitrary binary string to be used as a key.
+*  @return  The plaintext.
+*/
+static int decrypt (lua_State *L) {
+  size_t lcyphertext;
+  const char *cyphertext = luaL_checklstring(L, 1, &lcyphertext);
+  size_t lseed = cyphertext[0];
+  const char *seed = cyphertext+1;
+  int lblock;
+  char block[BLOCKSIZE+MAXKEY];
+  luaL_argcheck(L, lcyphertext >= lseed+1 && lseed <= BLOCKSIZE, 1,
+                 "invalid cyphered string");
+  cyphertext += lseed+1;
+  lcyphertext -= lseed+1;
+  lblock = initblock(L, seed, lseed, block);
+  decodestream(L, cyphertext, lcyphertext, block, lblock);
+  return 1;
+}
+
+
+/*
+** Assumes the table is on top of the stack.
+*/
+static void set_info (lua_State *L) {
+        lua_pushliteral (L, "_COPYRIGHT");
+        lua_pushliteral (L, "Copyright (C) 2003-2019 PUC-Rio");
+        lua_settable (L, -3);
+        lua_pushliteral (L, "_DESCRIPTION");
+        lua_pushliteral (L, "Checksum facilities for Lua");
+        lua_settable (L, -3);
+        lua_pushliteral (L, "_VERSION");
+        lua_pushliteral (L, "MD5 1.3");
+        lua_settable (L, -3);
+}
+
+
+static struct luaL_Reg md5lib[] = {
+  {"sum", lmd5},
+  {"exor", ex_or},
+  {"crypt", crypt},
+  {"decrypt", decrypt},
+  {NULL, NULL}
+};
+
+
+int luaopen_md5_core (lua_State *L) {
+  lua_newtable(L);
+  luaL_setfuncs(L, md5lib, 0);
+  set_info (L);
+  return 1;
+}