diff --git a/sha1.html b/sha1.html
index 67dd666..9e91a99 100644
--- a/sha1.html
+++ b/sha1.html
@@ -8,7 +8,11 @@
 		<script type="text/javascript" charset="utf-8">
 			function run()
 			{
-				document.getElementById('result').innerHTML = sha1("The quick brown fox jumps over the lazy dog");
+				sha1_profile();
+				if ( sha1_verify() )
+					document.getElementById('result').innerHTML = sha1("abcde");
+				else
+					document.getElementById('result').innerHTML = "Error!!!";
 			}
 		</script>
 		
diff --git a/sha1.js b/sha1.js
index a8fa004..119647c 100644
--- a/sha1.js
+++ b/sha1.js
@@ -3,10 +3,10 @@ function char_code_to_bytes(code)
 	var result = [];
 	do
 	{
-		result.push(code & 0xff);
-		code = code >> 8;
+		result.unshift(code & 0xff);
+		code >>= 8;
 	} while (code);
-	return result.reverse();
+	return result;
 }
 
 function str_to_bytes(str)
@@ -43,18 +43,39 @@ function bytes_to_big_endian_32(array)
 	return result;
 }
 
+function rol(x,n)
+{
+	return (x << n) | (x >>> (32 - n));
+}
+
+function to_hex(x)
+{
+	var h = ["0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"];
+	
+	return String( 
+		h[(x & 0xf0000000) >>> 28] + 
+		h[(x & 0x0f000000) >>> 24] + 
+		h[(x & 0x00f00000) >>> 20] + 
+		h[(x & 0x000f0000) >>> 16] + 
+		h[(x & 0x0000f000) >>> 12] + 
+		h[(x & 0x00000f00) >>>  8] + 
+		h[(x & 0x000000f0) >>>  4] + 
+		h[(x & 0x0000000f) >>>  0]
+		);
+}
+
 function sha1(text)
 {
 	// get text into byte array
-	var message = str_to_bytes(text);
+	var message              = str_to_bytes(text);
 	var message_size_in_bits = message.length * 8;
 
 	// Initialize variables:
 	var h0 = 0x67452301;
-	var h1 = 0xEFCDAB89;
-	var h2 = 0x98BADCFE;
+	var h1 = 0xefcdab89;
+	var h2 = 0x98badcfe;
 	var h3 = 0x10325476;
-	var h4 = 0xC3D2E1F0;
+	var h4 = 0xc3d2e1f0;
 
 	// Pre-processing:
 
@@ -63,7 +84,9 @@ function sha1(text)
 
 	// append (0 <= k < 512) bits '0', so that the resulting message length (in bits) is congruent to 448 = -64 (mod 512)
 	while ((message.length + 8) % 64) 
+	{
 		message.push(0);
+	};
 
 	// append length of message (before pre-processing), in bits, as 64-bit big-endian integer
 	message = message.concat(num_to_big_endian_64(message_size_in_bits));
@@ -71,11 +94,82 @@ function sha1(text)
 	// Process the message in successive 512-bit chunks:
 
 	// break message into 512-bit chunks
-	for (var i_chunk = 0; i_chunk < (message.length/8); i_chunk++)
+	for (var i_chunk = 0; i_chunk < (message.length/64); i_chunk++)
 	{
 		// break chunk into sixteen 32-bit big-endian words w[i], 0 <= i <= 15
-		var w = bytes_to_big_endian_32(message);
+		var w = bytes_to_big_endian_32(message.slice(i_chunk*64,(i_chunk*64)+64));
+
+		// Extend the sixteen 32-bit words into eighty 32-bit words:
+		for (var i = 16; i < 80; i++)
+		{
+			w.push(rol((w[i-3] ^ w[i-8] ^ w[i-14] ^ w[i-16]), 1));
+		};
+
+		// Initialize hash value for this chunk:
+		var a = h0;
+		var b = h1;
+		var c = h2;
+		var d = h3;
+		var e = h4;
+		var f = 0;
+		var k = 0;
+
+		// Main loop:
+		for (var i = 0; i < 80; i++)
+		{
+			if (i < 20)
+			{
+				f = d ^ (b & (c ^ d));
+				k = 0x5a827999;
+			}
+			else if (i < 40)
+			{
+				f = b ^ c ^ d;
+				k = 0x6ed9eba1;
+			}
+			else if (i < 60)
+			{
+				f = (b & c) | (b & d) | (c & d);
+				k = 0x8f1bbcdc;
+			}
+			else
+			{
+				f = b ^ c ^ d;
+				k = 0xca62c1d6;
+			}
+			
+			var temp = (rol(a,5) + f + e + k + w[i]) & 0xffffffff;
+			e = d;
+			d = c;
+			c = rol(b,30);
+			b = a;
+			a = temp;
+		};
+
+		// Add this chunk's hash to result so far:
+		h0 = (h0 + a) & 0xffffffff;
+		h1 = (h1 + b) & 0xffffffff;
+		h2 = (h2 + c) & 0xffffffff;
+		h3 = (h3 + d) & 0xffffffff;
+		h4 = (h4 + e) & 0xffffffff;
+	};
+
+	// Produce the final hash value (big-endian):
+	return to_hex(h0) + to_hex(h1) + to_hex(h2) + to_hex(h3) + to_hex(h4);
+}
+
+function sha1_verify()
+{
+	return Boolean(
+		(sha1("The quick brown fox jumps over the lazy dog") == "2fd4e1c67a2d28fced849ee1bb76e7391b93eb12") &&
+		(sha1("")                                            == "da39a3ee5e6b4b0d3255bfef95601890afd80709")
+		);
+}
+
+function sha1_profile()
+{
+	var text = "blah";
+	for (var i = 0; i < 250; i++) {
+		text = sha1(text);
 	};
-	
-	return message;
 }