hacking the server

[reposerve] / server / src / md5.c

diff --git a/server/src/md5.c b/server/src/md5.c
new file mode 100644 (file)
index 0000000..6b45070
--- /dev/null
+++ b/server/src/md5.c
@@ -0,0 +1,156 @@
+/* MD5 message digest
+ * Author: John Tsiombikas <nuclear@member.fsf.org>
+ *
+ * This software is public domain. Feel free to use it any way you like.
+ *
+ * If public domain is not applicable in your part of the world, you may use
+ * this under the terms of the Creative Commons CC-0 license:
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+#include <stdio.h>
+#include <string.h>
+#include "md5.h"
+
+#define BLOCKSZ 64
+
+static const int shifttab[] = {
+       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
+};
+
+static const uint32_t sintab[] = {
+       0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee,
+       0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
+       0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
+       0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
+       0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa,
+       0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
+       0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
+       0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
+       0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
+       0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
+       0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05,
+       0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
+       0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039,
+       0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
+       0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
+       0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391
+};
+
+static void sum_block(uint32_t *blk, uint32_t *sum);
+static uint32_t rol(uint32_t x, int s);
+
+void md5_begin(struct md5_state *md)
+{
+       md->sum[0] = 0x67452301;
+       md->sum[1] = 0xefcdab89;
+       md->sum[2] = 0x98badcfe;
+       md->sum[3] = 0x10325476;
+       md->len = 0;
+       md->bblen = 0;
+}
+
+void md5_msg(struct md5_state *md, void *msg, int msg_size)
+{
+       int pending, sz;
+
+       while(msg_size) {
+               pending = BLOCKSZ - md->bblen;
+               sz = msg_size > pending ? pending : msg_size;
+
+               memcpy(md->blockbuf + md->bblen, msg, sz);
+               msg = (char*)msg + sz;
+               md->bblen += sz;
+               msg_size -= sz;
+
+               if(md->bblen >= BLOCKSZ) {
+                       sum_block((uint32_t*)md->blockbuf, md->sum);
+                       md->bblen = 0;
+                       md->len += BLOCKSZ * 8;
+               }
+       }
+}
+
+static void sum_block(uint32_t *blk, uint32_t *sum)
+{
+       int i, f, g;
+       int a = sum[0];
+       int b = sum[1];
+       int c = sum[2];
+       int d = sum[3];
+
+       for(i=0; i<64; i++) {
+               switch(i >> 4) {
+               case 0:
+                       f = d ^ (b & (c ^ d));
+                       g = i;
+                       break;
+
+               case 1:
+                       f = c ^ (d & (b ^ c));
+                       g = (i * 5 + 1) & 0xf;
+                       break;
+
+               case 2:
+                       f = b ^ c ^ d;
+                       g = (i * 3 + 5) & 0xf;
+                       break;
+
+               case 3:
+                       f = c ^ (b | ~d);
+                       g = (i * 7) & 0xf;
+               }
+
+               f += a + sintab[i] + blk[g];
+               a = d;
+               d = c;
+               c = b;
+               b += rol(f, shifttab[i]);
+       }
+
+       sum[0] += a;
+       sum[1] += b;
+       sum[2] += c;
+       sum[3] += d;
+}
+
+static uint32_t rol(uint32_t x, int s)
+{
+       return (x << s) | (x >> (32 - s));
+}
+
+void md5_end(struct md5_state *md)
+{
+       md->len += md->bblen * 8;
+       md->blockbuf[md->bblen++] = 0x80;       /* append 1-bit plus 8 zeros padding */
+
+       if(md->bblen > BLOCKSZ - 8) {
+               /* pad to BLOCKSZ, sum, then continue with further padding */
+               memset(md->blockbuf + md->bblen, 0, BLOCKSZ - md->bblen);
+               sum_block((uint32_t*)md->blockbuf, md->sum);
+               md->bblen = 0;
+       }
+
+       /* pad to BLOCKSZ - 8 */
+       memset(md->blockbuf + md->bblen, 0, BLOCKSZ - 8 - md->bblen);
+
+       /* add the length */
+       *(uint64_t*)(md->blockbuf + BLOCKSZ - 8) = md->len;
+
+       /* then sum for the last time */
+       sum_block((uint32_t*)md->blockbuf, md->sum);
+}
+
+const char *md5_sumstr(struct md5_state *md)
+{
+       int i;
+       unsigned char *sum = (unsigned char*)md->sum;
+       char *s = (char*)md->blockbuf;
+
+       for(i=0; i<16; i++) {
+               s += sprintf(s, "%02x", sum[i]);
+       }
+       return (char*)md->blockbuf;
+}