diff --git a/main.d b/main.d
index 5b0bde6..62a4f6f 100644
--- a/main.d
+++ b/main.d
@@ -1,7 +1,18 @@
 import std.stdio;
+import std.string;
+import std.array, std.range;
+import std.file;
+import std.algorithm;
 
 extern(C) void tiger (char* parMessage, ulong parLength, out ulong[3] parOut, char parPadding);
 
+ulong swapLong (ulong parNum) {
+	parNum = (parNum & 0x00000000FFFFFFFF) << 32 | (parNum & 0xFFFFFFFF00000000) >> 32;
+	parNum = (parNum & 0x0000FFFF0000FFFF) << 16 | (parNum & 0xFFFF0000FFFF0000) >> 16;
+	parNum = (parNum & 0x00FF00FF00FF00FF) << 8  | (parNum & 0xFF00FF00FF00FF00) >> 8;
+	return parNum;
+}
+
 ulong[3] getTiger (in string parData, bool parV2) {
 	char[] unaligned = new char[parData.length + ulong.alignof - 1];
 	size_t offset = ((cast(size_t)unaligned.ptr + (ulong.alignof - 1)) & ~cast(size_t)(ulong.alignof - 1)) - cast(size_t)unaligned.ptr;
@@ -17,14 +28,61 @@ ulong[3] getTiger (in string parData, bool parV2) {
 	return retval;
 }
 
-void printHash(in string parData) {
-	ulong[3] hash1 = getTiger(parData, false);
-	ulong[3] hash2 = getTiger(parData, true);
-	writefln("Tiger  hash for \"%s\" is %X %X %X", parData, hash1[0], hash1[1], hash1[2]);
-	writefln("Tiger2 hash for \"%s\" is %X %X %X", parData, hash2[0], hash2[1], hash2[2]);
+ulong[3] getTiger (ref File parData, bool parV2) {
+	const auto buff_length = 8192;
+	ubyte[] unaligned = new ubyte[buff_length + ulong.alignof - 1];
+	size_t offset = ((cast(size_t)unaligned.ptr + (ulong.alignof - 1)) & ~cast(size_t)(ulong.alignof - 1)) - cast(size_t)unaligned.ptr;
+	assert(offset >= 0 && offset < ulong.alignof);
+
+	const char padding = (parV2 ? 0x80 : 0x01);
+	assert(offset + buff_length <= unaligned.length);
+	ubyte[] aligned = unaligned[offset .. buff_length];
+	assert(aligned.length == buff_length);
+
+	ulong[3] retval;
+	foreach (ubyte[] buff; parData.byChunk(aligned)) {
+		assert((cast(size_t)buff.ptr & cast(size_t)(ulong.alignof - 1)) == 0);
+		tiger((cast(char[])buff).ptr, buff.length, retval, padding);
+	}
+	return retval;
+}
+
+string tigerToString (in ulong[3] parTiger) {
+	return format("%016x%016x%016x", swapLong(parTiger[0]), swapLong(parTiger[1]), swapLong(parTiger[2]));
+}
+
+unittest {
+	assert("67e6ae8e9e968999f70a23e72aeaa9251cbc7c78a7916636" == tigerToString(getTiger("a", true)));
+	assert("f68d7bc5af4b43a06e048d7829560d4a9415658bb0b1f3bf" == tigerToString(getTiger("abc", true)));
+	assert("e29419a1b5fa259de8005e7de75078ea81a542ef2552462d" == tigerToString(getTiger("message digest", true)));
+	assert("f5b6b6a78c405c8547e91cd8624cb8be83fc804a474488fd" == tigerToString(getTiger("abcdefghijklmnopqrstuvwxyz", true)));
+	assert("a6737f3997e8fbb63d20d2df88f86376b5fe2d5ce36646a9" == tigerToString(getTiger("abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq", true)));
+	assert("ea9ab6228cee7b51b77544fca6066c8cbb5bbae6319505cd" == tigerToString(getTiger("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789", true)));
+	assert("d85278115329ebaa0eec85ecdc5396fda8aa3a5820942fff" == tigerToString(getTiger(replicate("1234567890", 8), true)));
+	assert("e068281f060f551628cc5715b9d0226796914d45f7717cf4" == tigerToString(getTiger(replicate("a", 1000000), true)));
+
+	assert("2aab1484e8c158f2bfb8c5ff41b57a525129131c957b5f93" == tigerToString(getTiger("abc", false)));
+	assert("dd00230799f5009fec6debc838bb6a27df2b9d6f110c7937" == tigerToString(getTiger("Tiger", false)));
+	assert("f71c8583902afb879edfe610f82c0d4786a3a534504486b5" == tigerToString(getTiger("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+-", false)));
+	assert("48ceeb6308b87d46e95d656112cdf18d97915f9765658957" == tigerToString(getTiger("ABCDEFGHIJKLMNOPQRSTUVWXYZ=abcdefghijklmnopqrstuvwxyz+0123456789", false)));
+	assert("8a866829040a410c729ad23f5ada711603b3cdd357e4c15e" == tigerToString(getTiger("Tiger - A Fast New Hash Function, by Ross Anderson and Eli Biham", false)));
+	assert("ce55a6afd591f5ebac547ff84f89227f9331dab0b611c889" == tigerToString(getTiger("Tiger - A Fast New Hash Function, by Ross Anderson and Eli Biham, proceedings of Fast Software Encryption 3, Cambridge.", false)));
+	assert("631abdd103eb9a3d245b6dfd4d77b257fc7439501d1568dd" == tigerToString(getTiger("Tiger - A Fast New Hash Function, by Ross Anderson and Eli Biham, proceedings of Fast Software Encryption 3, Cambridge, 1996.", false)));
+	assert("c54034e5b43eb8005848a7e0ae6aac76e4ff590ae715fd25" == tigerToString(getTiger("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+-ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+-", false)));
 }
 
 void main (string[] parArgs) {
-	printHash("abc");
-	printHash("Tiger");
+	const auto cwd = getcwd();
+	const auto working_dir = cwd ~ (cwd[$-1] == '/' ? "" : "/");
+
+	foreach (arg; parArgs[1 .. $]) {
+		const auto curr_path = working_dir ~ arg;
+		File curr_file = File(curr_path, "rb");
+		if (!isDir(curr_path)) {
+			writefln("%s  %s", tigerToString(getTiger(curr_file, true)), arg);
+		}
+		else {
+			writefln("tigersum: %s: is a directory", arg);
+		}
+	}
 }