diff -u unshield-0.5.orig/lib/md5/global.h unshield-0.5/lib/md5/global.h
--- unshield-0.5.orig/lib/md5/global.h	2006-09-26 18:19:28.000000000 -0400
+++ unshield-0.5/lib/md5/global.h	2006-09-26 18:17:04.000000000 -0400
@@ -17,7 +17,7 @@
 typedef unsigned short int UINT2;
 
 /* UINT4 defines a four byte word */
-typedef unsigned long int UINT4;
+typedef unsigned int UINT4;
 
 /* PROTO_LIST is defined depending on how PROTOTYPES is defined above.
 If using PROTOTYPES, then PROTO_LIST returns the list, otherwise it
diff -u unshield-0.5.orig/lib/md5/md5c.c unshield-0.5/lib/md5/md5c.c
--- unshield-0.5.orig/lib/md5/md5c.c	2006-09-26 18:19:28.000000000 -0400
+++ unshield-0.5/lib/md5/md5c.c	2006-09-26 18:18:11.000000000 -0400
@@ -68,7 +68,7 @@
 
 /* ROTATE_LEFT rotates x left n bits.
  */
-#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
+#define ROTATE_LEFT(x, n) ((((x) << (n)) & 0xffffffffU) | ((x) >> (32-(n))))
 
 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
 Rotation is separate from addition to prevent recomputation.