diff aes.c @ 3:ca3a006e292c

add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
author Matt Johnston <matt@ucc.asn.au>
date Tue, 04 Jun 2013 22:11:54 +0800
parents
children 87c8d0a11906
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/aes.c	Tue Jun 04 22:11:54 2013 +0800
@@ -0,0 +1,535 @@
+// advanced encryption standard
+// Original author: Karl Malbrain, [email protected]
+// Ported to Atmel AVR by: Jiri Pittner, [email protected]
+//
+/*
+This work, including the source code, documentation
+and related data, is placed into the public domain.
+
+The original author is Karl Malbrain.
+
+THIS SOFTWARE IS PROVIDED AS-IS WITHOUT WARRANTY
+OF ANY KIND, NOT EVEN THE IMPLIED WARRANTY OF
+MERCHANTABILITY. THE AUTHOR OF THIS SOFTWARE,
+ASSUMES _NO_ RESPONSIBILITY FOR ANY CONSEQUENCE
+RESULTING FROM THE USE, MODIFICATION, OR
+REDISTRIBUTION OF THIS SOFTWARE.
+*/
+
+#include <stdlib.h>
+#include <string.h>
+
+#include <avr/pgmspace.h> //tables have to reside in flash memory
+
+
+// AES only supports Nb=4
+#define Nb 4			// number of columns in the state & expanded key
+
+#define Nk 4			// number of columns in a key
+#define Nr 10			// number of rounds in encryption
+
+#define Sbox(i) (pgm_read_byte(&P_Sbox[i]))
+const unsigned char P_Sbox[256] __attribute__ ((__progmem__)) = {		// forward s-box
+0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
+0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
+0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
+0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
+0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
+0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
+0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
+0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
+0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
+0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
+0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
+0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
+0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
+0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
+0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
+0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16};
+
+#define InvSbox(i) (pgm_read_byte(&P_InvSbox[i]))
+const unsigned char P_InvSbox[256] __attribute__ ((__progmem__)) = {	// inverse s-box
+0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,
+0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,
+0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,
+0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25,
+0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92,
+0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,
+0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06,
+0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b,
+0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,
+0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e,
+0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,
+0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,
+0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,
+0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,
+0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
+0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d};
+
+// combined Xtimes2[Sbox[]]
+#define Xtime2Sbox(i) (pgm_read_byte(&P_Xtime2Sbox[i]))
+const unsigned char P_Xtime2Sbox[256] __attribute__ ((__progmem__)) = {
+0xc6, 0xf8, 0xee, 0xf6, 0xff, 0xd6, 0xde, 0x91, 0x60, 0x02, 0xce, 0x56, 0xe7, 0xb5, 0x4d, 0xec, 
+0x8f, 0x1f, 0x89, 0xfa, 0xef, 0xb2, 0x8e, 0xfb, 0x41, 0xb3, 0x5f, 0x45, 0x23, 0x53, 0xe4, 0x9b, 
+0x75, 0xe1, 0x3d, 0x4c, 0x6c, 0x7e, 0xf5, 0x83, 0x68, 0x51, 0xd1, 0xf9, 0xe2, 0xab, 0x62, 0x2a, 
+0x08, 0x95, 0x46, 0x9d, 0x30, 0x37, 0x0a, 0x2f, 0x0e, 0x24, 0x1b, 0xdf, 0xcd, 0x4e, 0x7f, 0xea, 
+0x12, 0x1d, 0x58, 0x34, 0x36, 0xdc, 0xb4, 0x5b, 0xa4, 0x76, 0xb7, 0x7d, 0x52, 0xdd, 0x5e, 0x13, 
+0xa6, 0xb9, 0x00, 0xc1, 0x40, 0xe3, 0x79, 0xb6, 0xd4, 0x8d, 0x67, 0x72, 0x94, 0x98, 0xb0, 0x85, 
+0xbb, 0xc5, 0x4f, 0xed, 0x86, 0x9a, 0x66, 0x11, 0x8a, 0xe9, 0x04, 0xfe, 0xa0, 0x78, 0x25, 0x4b, 
+0xa2, 0x5d, 0x80, 0x05, 0x3f, 0x21, 0x70, 0xf1, 0x63, 0x77, 0xaf, 0x42, 0x20, 0xe5, 0xfd, 0xbf, 
+0x81, 0x18, 0x26, 0xc3, 0xbe, 0x35, 0x88, 0x2e, 0x93, 0x55, 0xfc, 0x7a, 0xc8, 0xba, 0x32, 0xe6, 
+0xc0, 0x19, 0x9e, 0xa3, 0x44, 0x54, 0x3b, 0x0b, 0x8c, 0xc7, 0x6b, 0x28, 0xa7, 0xbc, 0x16, 0xad, 
+0xdb, 0x64, 0x74, 0x14, 0x92, 0x0c, 0x48, 0xb8, 0x9f, 0xbd, 0x43, 0xc4, 0x39, 0x31, 0xd3, 0xf2, 
+0xd5, 0x8b, 0x6e, 0xda, 0x01, 0xb1, 0x9c, 0x49, 0xd8, 0xac, 0xf3, 0xcf, 0xca, 0xf4, 0x47, 0x10, 
+0x6f, 0xf0, 0x4a, 0x5c, 0x38, 0x57, 0x73, 0x97, 0xcb, 0xa1, 0xe8, 0x3e, 0x96, 0x61, 0x0d, 0x0f, 
+0xe0, 0x7c, 0x71, 0xcc, 0x90, 0x06, 0xf7, 0x1c, 0xc2, 0x6a, 0xae, 0x69, 0x17, 0x99, 0x3a, 0x27, 
+0xd9, 0xeb, 0x2b, 0x22, 0xd2, 0xa9, 0x07, 0x33, 0x2d, 0x3c, 0x15, 0xc9, 0x87, 0xaa, 0x50, 0xa5, 
+0x03, 0x59, 0x09, 0x1a, 0x65, 0xd7, 0x84, 0xd0, 0x82, 0x29, 0x5a, 0x1e, 0x7b, 0xa8, 0x6d, 0x2c 
+};
+
+// combined Xtimes3[Sbox[]]
+#define Xtime3Sbox(i) (pgm_read_byte(&P_Xtime3Sbox[i]))
+const unsigned char P_Xtime3Sbox[256] __attribute__ ((__progmem__)) = {
+0xa5, 0x84, 0x99, 0x8d, 0x0d, 0xbd, 0xb1, 0x54, 0x50, 0x03, 0xa9, 0x7d, 0x19, 0x62, 0xe6, 0x9a, 
+0x45, 0x9d, 0x40, 0x87, 0x15, 0xeb, 0xc9, 0x0b, 0xec, 0x67, 0xfd, 0xea, 0xbf, 0xf7, 0x96, 0x5b, 
+0xc2, 0x1c, 0xae, 0x6a, 0x5a, 0x41, 0x02, 0x4f, 0x5c, 0xf4, 0x34, 0x08, 0x93, 0x73, 0x53, 0x3f, 
+0x0c, 0x52, 0x65, 0x5e, 0x28, 0xa1, 0x0f, 0xb5, 0x09, 0x36, 0x9b, 0x3d, 0x26, 0x69, 0xcd, 0x9f, 
+0x1b, 0x9e, 0x74, 0x2e, 0x2d, 0xb2, 0xee, 0xfb, 0xf6, 0x4d, 0x61, 0xce, 0x7b, 0x3e, 0x71, 0x97, 
+0xf5, 0x68, 0x00, 0x2c, 0x60, 0x1f, 0xc8, 0xed, 0xbe, 0x46, 0xd9, 0x4b, 0xde, 0xd4, 0xe8, 0x4a, 
+0x6b, 0x2a, 0xe5, 0x16, 0xc5, 0xd7, 0x55, 0x94, 0xcf, 0x10, 0x06, 0x81, 0xf0, 0x44, 0xba, 0xe3, 
+0xf3, 0xfe, 0xc0, 0x8a, 0xad, 0xbc, 0x48, 0x04, 0xdf, 0xc1, 0x75, 0x63, 0x30, 0x1a, 0x0e, 0x6d, 
+0x4c, 0x14, 0x35, 0x2f, 0xe1, 0xa2, 0xcc, 0x39, 0x57, 0xf2, 0x82, 0x47, 0xac, 0xe7, 0x2b, 0x95, 
+0xa0, 0x98, 0xd1, 0x7f, 0x66, 0x7e, 0xab, 0x83, 0xca, 0x29, 0xd3, 0x3c, 0x79, 0xe2, 0x1d, 0x76, 
+0x3b, 0x56, 0x4e, 0x1e, 0xdb, 0x0a, 0x6c, 0xe4, 0x5d, 0x6e, 0xef, 0xa6, 0xa8, 0xa4, 0x37, 0x8b, 
+0x32, 0x43, 0x59, 0xb7, 0x8c, 0x64, 0xd2, 0xe0, 0xb4, 0xfa, 0x07, 0x25, 0xaf, 0x8e, 0xe9, 0x18, 
+0xd5, 0x88, 0x6f, 0x72, 0x24, 0xf1, 0xc7, 0x51, 0x23, 0x7c, 0x9c, 0x21, 0xdd, 0xdc, 0x86, 0x85, 
+0x90, 0x42, 0xc4, 0xaa, 0xd8, 0x05, 0x01, 0x12, 0xa3, 0x5f, 0xf9, 0xd0, 0x91, 0x58, 0x27, 0xb9, 
+0x38, 0x13, 0xb3, 0x33, 0xbb, 0x70, 0x89, 0xa7, 0xb6, 0x22, 0x92, 0x20, 0x49, 0xff, 0x78, 0x7a, 
+0x8f, 0xf8, 0x80, 0x17, 0xda, 0x31, 0xc6, 0xb8, 0xc3, 0xb0, 0x77, 0x11, 0xcb, 0xfc, 0xd6, 0x3a 
+};
+
+// modular multiplication tables
+// based on:
+
+// Xtime2[x] = (x & 0x80 ? 0x1b : 0) ^ (x + x)
+// Xtime3[x] = x^Xtime2[x];
+
+#define Xtime2(i) (pgm_read_byte(&P_Xtime2[i]))
+const unsigned char P_Xtime2[256] __attribute__ ((__progmem__)) = {
+0x00, 0x02, 0x04, 0x06, 0x08, 0x0a, 0x0c, 0x0e, 0x10, 0x12, 0x14, 0x16, 0x18, 0x1a, 0x1c, 0x1e, 
+0x20, 0x22, 0x24, 0x26, 0x28, 0x2a, 0x2c, 0x2e, 0x30, 0x32, 0x34, 0x36, 0x38, 0x3a, 0x3c, 0x3e, 
+0x40, 0x42, 0x44, 0x46, 0x48, 0x4a, 0x4c, 0x4e, 0x50, 0x52, 0x54, 0x56, 0x58, 0x5a, 0x5c, 0x5e, 
+0x60, 0x62, 0x64, 0x66, 0x68, 0x6a, 0x6c, 0x6e, 0x70, 0x72, 0x74, 0x76, 0x78, 0x7a, 0x7c, 0x7e, 
+0x80, 0x82, 0x84, 0x86, 0x88, 0x8a, 0x8c, 0x8e, 0x90, 0x92, 0x94, 0x96, 0x98, 0x9a, 0x9c, 0x9e, 
+0xa0, 0xa2, 0xa4, 0xa6, 0xa8, 0xaa, 0xac, 0xae, 0xb0, 0xb2, 0xb4, 0xb6, 0xb8, 0xba, 0xbc, 0xbe, 
+0xc0, 0xc2, 0xc4, 0xc6, 0xc8, 0xca, 0xcc, 0xce, 0xd0, 0xd2, 0xd4, 0xd6, 0xd8, 0xda, 0xdc, 0xde, 
+0xe0, 0xe2, 0xe4, 0xe6, 0xe8, 0xea, 0xec, 0xee, 0xf0, 0xf2, 0xf4, 0xf6, 0xf8, 0xfa, 0xfc, 0xfe, 
+0x1b, 0x19, 0x1f, 0x1d, 0x13, 0x11, 0x17, 0x15, 0x0b, 0x09, 0x0f, 0x0d, 0x03, 0x01, 0x07, 0x05, 
+0x3b, 0x39, 0x3f, 0x3d, 0x33, 0x31, 0x37, 0x35, 0x2b, 0x29, 0x2f, 0x2d, 0x23, 0x21, 0x27, 0x25, 
+0x5b, 0x59, 0x5f, 0x5d, 0x53, 0x51, 0x57, 0x55, 0x4b, 0x49, 0x4f, 0x4d, 0x43, 0x41, 0x47, 0x45, 
+0x7b, 0x79, 0x7f, 0x7d, 0x73, 0x71, 0x77, 0x75, 0x6b, 0x69, 0x6f, 0x6d, 0x63, 0x61, 0x67, 0x65, 
+0x9b, 0x99, 0x9f, 0x9d, 0x93, 0x91, 0x97, 0x95, 0x8b, 0x89, 0x8f, 0x8d, 0x83, 0x81, 0x87, 0x85, 
+0xbb, 0xb9, 0xbf, 0xbd, 0xb3, 0xb1, 0xb7, 0xb5, 0xab, 0xa9, 0xaf, 0xad, 0xa3, 0xa1, 0xa7, 0xa5, 
+0xdb, 0xd9, 0xdf, 0xdd, 0xd3, 0xd1, 0xd7, 0xd5, 0xcb, 0xc9, 0xcf, 0xcd, 0xc3, 0xc1, 0xc7, 0xc5, 
+0xfb, 0xf9, 0xff, 0xfd, 0xf3, 0xf1, 0xf7, 0xf5, 0xeb, 0xe9, 0xef, 0xed, 0xe3, 0xe1, 0xe7, 0xe5}; 
+
+#define Xtime9(i) (pgm_read_byte(&P_Xtime9[i]))
+const unsigned char P_Xtime9[256] __attribute__ ((__progmem__)) = {
+0x00, 0x09, 0x12, 0x1b, 0x24, 0x2d, 0x36, 0x3f, 0x48, 0x41, 0x5a, 0x53, 0x6c, 0x65, 0x7e, 0x77, 
+0x90, 0x99, 0x82, 0x8b, 0xb4, 0xbd, 0xa6, 0xaf, 0xd8, 0xd1, 0xca, 0xc3, 0xfc, 0xf5, 0xee, 0xe7, 
+0x3b, 0x32, 0x29, 0x20, 0x1f, 0x16, 0x0d, 0x04, 0x73, 0x7a, 0x61, 0x68, 0x57, 0x5e, 0x45, 0x4c, 
+0xab, 0xa2, 0xb9, 0xb0, 0x8f, 0x86, 0x9d, 0x94, 0xe3, 0xea, 0xf1, 0xf8, 0xc7, 0xce, 0xd5, 0xdc, 
+0x76, 0x7f, 0x64, 0x6d, 0x52, 0x5b, 0x40, 0x49, 0x3e, 0x37, 0x2c, 0x25, 0x1a, 0x13, 0x08, 0x01, 
+0xe6, 0xef, 0xf4, 0xfd, 0xc2, 0xcb, 0xd0, 0xd9, 0xae, 0xa7, 0xbc, 0xb5, 0x8a, 0x83, 0x98, 0x91, 
+0x4d, 0x44, 0x5f, 0x56, 0x69, 0x60, 0x7b, 0x72, 0x05, 0x0c, 0x17, 0x1e, 0x21, 0x28, 0x33, 0x3a, 
+0xdd, 0xd4, 0xcf, 0xc6, 0xf9, 0xf0, 0xeb, 0xe2, 0x95, 0x9c, 0x87, 0x8e, 0xb1, 0xb8, 0xa3, 0xaa, 
+0xec, 0xe5, 0xfe, 0xf7, 0xc8, 0xc1, 0xda, 0xd3, 0xa4, 0xad, 0xb6, 0xbf, 0x80, 0x89, 0x92, 0x9b, 
+0x7c, 0x75, 0x6e, 0x67, 0x58, 0x51, 0x4a, 0x43, 0x34, 0x3d, 0x26, 0x2f, 0x10, 0x19, 0x02, 0x0b, 
+0xd7, 0xde, 0xc5, 0xcc, 0xf3, 0xfa, 0xe1, 0xe8, 0x9f, 0x96, 0x8d, 0x84, 0xbb, 0xb2, 0xa9, 0xa0, 
+0x47, 0x4e, 0x55, 0x5c, 0x63, 0x6a, 0x71, 0x78, 0x0f, 0x06, 0x1d, 0x14, 0x2b, 0x22, 0x39, 0x30, 
+0x9a, 0x93, 0x88, 0x81, 0xbe, 0xb7, 0xac, 0xa5, 0xd2, 0xdb, 0xc0, 0xc9, 0xf6, 0xff, 0xe4, 0xed, 
+0x0a, 0x03, 0x18, 0x11, 0x2e, 0x27, 0x3c, 0x35, 0x42, 0x4b, 0x50, 0x59, 0x66, 0x6f, 0x74, 0x7d, 
+0xa1, 0xa8, 0xb3, 0xba, 0x85, 0x8c, 0x97, 0x9e, 0xe9, 0xe0, 0xfb, 0xf2, 0xcd, 0xc4, 0xdf, 0xd6, 
+0x31, 0x38, 0x23, 0x2a, 0x15, 0x1c, 0x07, 0x0e, 0x79, 0x70, 0x6b, 0x62, 0x5d, 0x54, 0x4f, 0x46};
+
+#define XtimeB(i) (pgm_read_byte(&P_XtimeB[i]))
+const unsigned char P_XtimeB[256] __attribute__ ((__progmem__)) = {
+0x00, 0x0b, 0x16, 0x1d, 0x2c, 0x27, 0x3a, 0x31, 0x58, 0x53, 0x4e, 0x45, 0x74, 0x7f, 0x62, 0x69, 
+0xb0, 0xbb, 0xa6, 0xad, 0x9c, 0x97, 0x8a, 0x81, 0xe8, 0xe3, 0xfe, 0xf5, 0xc4, 0xcf, 0xd2, 0xd9, 
+0x7b, 0x70, 0x6d, 0x66, 0x57, 0x5c, 0x41, 0x4a, 0x23, 0x28, 0x35, 0x3e, 0x0f, 0x04, 0x19, 0x12, 
+0xcb, 0xc0, 0xdd, 0xd6, 0xe7, 0xec, 0xf1, 0xfa, 0x93, 0x98, 0x85, 0x8e, 0xbf, 0xb4, 0xa9, 0xa2, 
+0xf6, 0xfd, 0xe0, 0xeb, 0xda, 0xd1, 0xcc, 0xc7, 0xae, 0xa5, 0xb8, 0xb3, 0x82, 0x89, 0x94, 0x9f, 
+0x46, 0x4d, 0x50, 0x5b, 0x6a, 0x61, 0x7c, 0x77, 0x1e, 0x15, 0x08, 0x03, 0x32, 0x39, 0x24, 0x2f, 
+0x8d, 0x86, 0x9b, 0x90, 0xa1, 0xaa, 0xb7, 0xbc, 0xd5, 0xde, 0xc3, 0xc8, 0xf9, 0xf2, 0xef, 0xe4, 
+0x3d, 0x36, 0x2b, 0x20, 0x11, 0x1a, 0x07, 0x0c, 0x65, 0x6e, 0x73, 0x78, 0x49, 0x42, 0x5f, 0x54, 
+0xf7, 0xfc, 0xe1, 0xea, 0xdb, 0xd0, 0xcd, 0xc6, 0xaf, 0xa4, 0xb9, 0xb2, 0x83, 0x88, 0x95, 0x9e, 
+0x47, 0x4c, 0x51, 0x5a, 0x6b, 0x60, 0x7d, 0x76, 0x1f, 0x14, 0x09, 0x02, 0x33, 0x38, 0x25, 0x2e, 
+0x8c, 0x87, 0x9a, 0x91, 0xa0, 0xab, 0xb6, 0xbd, 0xd4, 0xdf, 0xc2, 0xc9, 0xf8, 0xf3, 0xee, 0xe5, 
+0x3c, 0x37, 0x2a, 0x21, 0x10, 0x1b, 0x06, 0x0d, 0x64, 0x6f, 0x72, 0x79, 0x48, 0x43, 0x5e, 0x55, 
+0x01, 0x0a, 0x17, 0x1c, 0x2d, 0x26, 0x3b, 0x30, 0x59, 0x52, 0x4f, 0x44, 0x75, 0x7e, 0x63, 0x68, 
+0xb1, 0xba, 0xa7, 0xac, 0x9d, 0x96, 0x8b, 0x80, 0xe9, 0xe2, 0xff, 0xf4, 0xc5, 0xce, 0xd3, 0xd8, 
+0x7a, 0x71, 0x6c, 0x67, 0x56, 0x5d, 0x40, 0x4b, 0x22, 0x29, 0x34, 0x3f, 0x0e, 0x05, 0x18, 0x13, 
+0xca, 0xc1, 0xdc, 0xd7, 0xe6, 0xed, 0xf0, 0xfb, 0x92, 0x99, 0x84, 0x8f, 0xbe, 0xb5, 0xa8, 0xa3}; 
+
+#define XtimeD(i) (pgm_read_byte(&P_XtimeD[i]))
+const unsigned char P_XtimeD[256] __attribute__ ((__progmem__)) = {
+0x00, 0x0d, 0x1a, 0x17, 0x34, 0x39, 0x2e, 0x23, 0x68, 0x65, 0x72, 0x7f, 0x5c, 0x51, 0x46, 0x4b, 
+0xd0, 0xdd, 0xca, 0xc7, 0xe4, 0xe9, 0xfe, 0xf3, 0xb8, 0xb5, 0xa2, 0xaf, 0x8c, 0x81, 0x96, 0x9b, 
+0xbb, 0xb6, 0xa1, 0xac, 0x8f, 0x82, 0x95, 0x98, 0xd3, 0xde, 0xc9, 0xc4, 0xe7, 0xea, 0xfd, 0xf0, 
+0x6b, 0x66, 0x71, 0x7c, 0x5f, 0x52, 0x45, 0x48, 0x03, 0x0e, 0x19, 0x14, 0x37, 0x3a, 0x2d, 0x20, 
+0x6d, 0x60, 0x77, 0x7a, 0x59, 0x54, 0x43, 0x4e, 0x05, 0x08, 0x1f, 0x12, 0x31, 0x3c, 0x2b, 0x26, 
+0xbd, 0xb0, 0xa7, 0xaa, 0x89, 0x84, 0x93, 0x9e, 0xd5, 0xd8, 0xcf, 0xc2, 0xe1, 0xec, 0xfb, 0xf6, 
+0xd6, 0xdb, 0xcc, 0xc1, 0xe2, 0xef, 0xf8, 0xf5, 0xbe, 0xb3, 0xa4, 0xa9, 0x8a, 0x87, 0x90, 0x9d, 
+0x06, 0x0b, 0x1c, 0x11, 0x32, 0x3f, 0x28, 0x25, 0x6e, 0x63, 0x74, 0x79, 0x5a, 0x57, 0x40, 0x4d, 
+0xda, 0xd7, 0xc0, 0xcd, 0xee, 0xe3, 0xf4, 0xf9, 0xb2, 0xbf, 0xa8, 0xa5, 0x86, 0x8b, 0x9c, 0x91, 
+0x0a, 0x07, 0x10, 0x1d, 0x3e, 0x33, 0x24, 0x29, 0x62, 0x6f, 0x78, 0x75, 0x56, 0x5b, 0x4c, 0x41, 
+0x61, 0x6c, 0x7b, 0x76, 0x55, 0x58, 0x4f, 0x42, 0x09, 0x04, 0x13, 0x1e, 0x3d, 0x30, 0x27, 0x2a, 
+0xb1, 0xbc, 0xab, 0xa6, 0x85, 0x88, 0x9f, 0x92, 0xd9, 0xd4, 0xc3, 0xce, 0xed, 0xe0, 0xf7, 0xfa, 
+0xb7, 0xba, 0xad, 0xa0, 0x83, 0x8e, 0x99, 0x94, 0xdf, 0xd2, 0xc5, 0xc8, 0xeb, 0xe6, 0xf1, 0xfc, 
+0x67, 0x6a, 0x7d, 0x70, 0x53, 0x5e, 0x49, 0x44, 0x0f, 0x02, 0x15, 0x18, 0x3b, 0x36, 0x21, 0x2c, 
+0x0c, 0x01, 0x16, 0x1b, 0x38, 0x35, 0x22, 0x2f, 0x64, 0x69, 0x7e, 0x73, 0x50, 0x5d, 0x4a, 0x47, 
+0xdc, 0xd1, 0xc6, 0xcb, 0xe8, 0xe5, 0xf2, 0xff, 0xb4, 0xb9, 0xae, 0xa3, 0x80, 0x8d, 0x9a, 0x97}; 
+
+#define XtimeE(i) (pgm_read_byte(&P_XtimeE[i]))
+const unsigned char P_XtimeE[256] __attribute__ ((__progmem__)) = {
+0x00, 0x0e, 0x1c, 0x12, 0x38, 0x36, 0x24, 0x2a, 0x70, 0x7e, 0x6c, 0x62, 0x48, 0x46, 0x54, 0x5a, 
+0xe0, 0xee, 0xfc, 0xf2, 0xd8, 0xd6, 0xc4, 0xca, 0x90, 0x9e, 0x8c, 0x82, 0xa8, 0xa6, 0xb4, 0xba, 
+0xdb, 0xd5, 0xc7, 0xc9, 0xe3, 0xed, 0xff, 0xf1, 0xab, 0xa5, 0xb7, 0xb9, 0x93, 0x9d, 0x8f, 0x81, 
+0x3b, 0x35, 0x27, 0x29, 0x03, 0x0d, 0x1f, 0x11, 0x4b, 0x45, 0x57, 0x59, 0x73, 0x7d, 0x6f, 0x61, 
+0xad, 0xa3, 0xb1, 0xbf, 0x95, 0x9b, 0x89, 0x87, 0xdd, 0xd3, 0xc1, 0xcf, 0xe5, 0xeb, 0xf9, 0xf7, 
+0x4d, 0x43, 0x51, 0x5f, 0x75, 0x7b, 0x69, 0x67, 0x3d, 0x33, 0x21, 0x2f, 0x05, 0x0b, 0x19, 0x17, 
+0x76, 0x78, 0x6a, 0x64, 0x4e, 0x40, 0x52, 0x5c, 0x06, 0x08, 0x1a, 0x14, 0x3e, 0x30, 0x22, 0x2c, 
+0x96, 0x98, 0x8a, 0x84, 0xae, 0xa0, 0xb2, 0xbc, 0xe6, 0xe8, 0xfa, 0xf4, 0xde, 0xd0, 0xc2, 0xcc, 
+0x41, 0x4f, 0x5d, 0x53, 0x79, 0x77, 0x65, 0x6b, 0x31, 0x3f, 0x2d, 0x23, 0x09, 0x07, 0x15, 0x1b, 
+0xa1, 0xaf, 0xbd, 0xb3, 0x99, 0x97, 0x85, 0x8b, 0xd1, 0xdf, 0xcd, 0xc3, 0xe9, 0xe7, 0xf5, 0xfb, 
+0x9a, 0x94, 0x86, 0x88, 0xa2, 0xac, 0xbe, 0xb0, 0xea, 0xe4, 0xf6, 0xf8, 0xd2, 0xdc, 0xce, 0xc0, 
+0x7a, 0x74, 0x66, 0x68, 0x42, 0x4c, 0x5e, 0x50, 0x0a, 0x04, 0x16, 0x18, 0x32, 0x3c, 0x2e, 0x20, 
+0xec, 0xe2, 0xf0, 0xfe, 0xd4, 0xda, 0xc8, 0xc6, 0x9c, 0x92, 0x80, 0x8e, 0xa4, 0xaa, 0xb8, 0xb6, 
+0x0c, 0x02, 0x10, 0x1e, 0x34, 0x3a, 0x28, 0x26, 0x7c, 0x72, 0x60, 0x6e, 0x44, 0x4a, 0x58, 0x56, 
+0x37, 0x39, 0x2b, 0x25, 0x0f, 0x01, 0x13, 0x1d, 0x47, 0x49, 0x5b, 0x55, 0x7f, 0x71, 0x63, 0x6d, 
+0xd7, 0xd9, 0xcb, 0xc5, 0xef, 0xe1, 0xf3, 0xfd, 0xa7, 0xa9, 0xbb, 0xb5, 0x9f, 0x91, 0x83, 0x8d}; 
+
+// exchanges columns in each of 4 rows
+// row0 - unchanged, row1- shifted left 1, 
+// row2 - shifted left 2 and row3 - shifted left 3
+void ShiftRows (unsigned char *state)
+{
+unsigned char tmp;
+
+	// just substitute row 0
+	state[0] = Sbox(state[0]), state[4] = Sbox(state[4]);
+	state[8] = Sbox(state[8]), state[12] = Sbox(state[12]);
+
+	// rotate row 1
+	tmp = Sbox(state[1]), state[1] = Sbox(state[5]);
+	state[5] = Sbox(state[9]), state[9] = Sbox(state[13]), state[13] = tmp;
+
+	// rotate row 2
+	tmp = Sbox(state[2]), state[2] = Sbox(state[10]), state[10] = tmp;
+	tmp = Sbox(state[6]), state[6] = Sbox(state[14]), state[14] = tmp;
+
+	// rotate row 3
+	tmp = Sbox(state[15]), state[15] = Sbox(state[11]);
+	state[11] = Sbox(state[7]), state[7] = Sbox(state[3]), state[3] = tmp;
+}
+
+// restores columns in each of 4 rows
+// row0 - unchanged, row1- shifted right 1, 
+// row2 - shifted right 2 and row3 - shifted right 3
+void InvShiftRows (unsigned char *state)
+{
+unsigned char tmp;
+
+	// restore row 0
+	state[0] = InvSbox(state[0]), state[4] = InvSbox(state[4]);
+	state[8] = InvSbox(state[8]), state[12] = InvSbox(state[12]);
+
+	// restore row 1
+	tmp = InvSbox(state[13]), state[13] = InvSbox(state[9]);
+	state[9] = InvSbox(state[5]), state[5] = InvSbox(state[1]), state[1] = tmp;
+
+	// restore row 2
+	tmp = InvSbox(state[2]), state[2] = InvSbox(state[10]), state[10] = tmp;
+	tmp = InvSbox(state[6]), state[6] = InvSbox(state[14]), state[14] = tmp;
+
+	// restore row 3
+	tmp = InvSbox(state[3]), state[3] = InvSbox(state[7]);
+	state[7] = InvSbox(state[11]), state[11] = InvSbox(state[15]), state[15] = tmp;
+}
+
+// recombine and mix each row in a column
+void MixSubColumns (unsigned char *state)
+{
+unsigned char tmp[4 * Nb];
+
+	// mixing column 0
+	tmp[0] = Xtime2Sbox(state[0]) ^ Xtime3Sbox(state[5]) ^ Sbox(state[10]) ^ Sbox(state[15]);
+	tmp[1] = Sbox(state[0]) ^ Xtime2Sbox(state[5]) ^ Xtime3Sbox(state[10]) ^ Sbox(state[15]);
+	tmp[2] = Sbox(state[0]) ^ Sbox(state[5]) ^ Xtime2Sbox(state[10]) ^ Xtime3Sbox(state[15]);
+	tmp[3] = Xtime3Sbox(state[0]) ^ Sbox(state[5]) ^ Sbox(state[10]) ^ Xtime2Sbox(state[15]);
+
+	// mixing column 1
+	tmp[4] = Xtime2Sbox(state[4]) ^ Xtime3Sbox(state[9]) ^ Sbox(state[14]) ^ Sbox(state[3]);
+	tmp[5] = Sbox(state[4]) ^ Xtime2Sbox(state[9]) ^ Xtime3Sbox(state[14]) ^ Sbox(state[3]);
+	tmp[6] = Sbox(state[4]) ^ Sbox(state[9]) ^ Xtime2Sbox(state[14]) ^ Xtime3Sbox(state[3]);
+	tmp[7] = Xtime3Sbox(state[4]) ^ Sbox(state[9]) ^ Sbox(state[14]) ^ Xtime2Sbox(state[3]);
+
+	// mixing column 2
+	tmp[8] = Xtime2Sbox(state[8]) ^ Xtime3Sbox(state[13]) ^ Sbox(state[2]) ^ Sbox(state[7]);
+	tmp[9] = Sbox(state[8]) ^ Xtime2Sbox(state[13]) ^ Xtime3Sbox(state[2]) ^ Sbox(state[7]);
+	tmp[10]  = Sbox(state[8]) ^ Sbox(state[13]) ^ Xtime2Sbox(state[2]) ^ Xtime3Sbox(state[7]);
+	tmp[11]  = Xtime3Sbox(state[8]) ^ Sbox(state[13]) ^ Sbox(state[2]) ^ Xtime2Sbox(state[7]);
+
+	// mixing column 3
+	tmp[12] = Xtime2Sbox(state[12]) ^ Xtime3Sbox(state[1]) ^ Sbox(state[6]) ^ Sbox(state[11]);
+	tmp[13] = Sbox(state[12]) ^ Xtime2Sbox(state[1]) ^ Xtime3Sbox(state[6]) ^ Sbox(state[11]);
+	tmp[14] = Sbox(state[12]) ^ Sbox(state[1]) ^ Xtime2Sbox(state[6]) ^ Xtime3Sbox(state[11]);
+	tmp[15] = Xtime3Sbox(state[12]) ^ Sbox(state[1]) ^ Sbox(state[6]) ^ Xtime2Sbox(state[11]);
+
+	memcpy (state, tmp, sizeof(tmp));
+}
+
+// restore and un-mix each row in a column
+void InvMixSubColumns (unsigned char *state)
+{
+unsigned char tmp[4 * Nb];
+int i;
+
+	// restore column 0
+	tmp[0] = XtimeE(state[0]) ^ XtimeB(state[1]) ^ XtimeD(state[2]) ^ Xtime9(state[3]);
+	tmp[5] = Xtime9(state[0]) ^ XtimeE(state[1]) ^ XtimeB(state[2]) ^ XtimeD(state[3]);
+	tmp[10] = XtimeD(state[0]) ^ Xtime9(state[1]) ^ XtimeE(state[2]) ^ XtimeB(state[3]);
+	tmp[15] = XtimeB(state[0]) ^ XtimeD(state[1]) ^ Xtime9(state[2]) ^ XtimeE(state[3]);
+
+	// restore column 1
+	tmp[4] = XtimeE(state[4]) ^ XtimeB(state[5]) ^ XtimeD(state[6]) ^ Xtime9(state[7]);
+	tmp[9] = Xtime9(state[4]) ^ XtimeE(state[5]) ^ XtimeB(state[6]) ^ XtimeD(state[7]);
+	tmp[14] = XtimeD(state[4]) ^ Xtime9(state[5]) ^ XtimeE(state[6]) ^ XtimeB(state[7]);
+	tmp[3] = XtimeB(state[4]) ^ XtimeD(state[5]) ^ Xtime9(state[6]) ^ XtimeE(state[7]);
+
+	// restore column 2
+	tmp[8] = XtimeE(state[8]) ^ XtimeB(state[9]) ^ XtimeD(state[10]) ^ Xtime9(state[11]);
+	tmp[13] = Xtime9(state[8]) ^ XtimeE(state[9]) ^ XtimeB(state[10]) ^ XtimeD(state[11]);
+	tmp[2]  = XtimeD(state[8]) ^ Xtime9(state[9]) ^ XtimeE(state[10]) ^ XtimeB(state[11]);
+	tmp[7]  = XtimeB(state[8]) ^ XtimeD(state[9]) ^ Xtime9(state[10]) ^ XtimeE(state[11]);
+
+	// restore column 3
+	tmp[12] = XtimeE(state[12]) ^ XtimeB(state[13]) ^ XtimeD(state[14]) ^ Xtime9(state[15]);
+	tmp[1] = Xtime9(state[12]) ^ XtimeE(state[13]) ^ XtimeB(state[14]) ^ XtimeD(state[15]);
+	tmp[6] = XtimeD(state[12]) ^ Xtime9(state[13]) ^ XtimeE(state[14]) ^ XtimeB(state[15]);
+	tmp[11] = XtimeB(state[12]) ^ XtimeD(state[13]) ^ Xtime9(state[14]) ^ XtimeE(state[15]);
+
+	for( i=0; i < 4 * Nb; i++ )
+		state[i] = InvSbox(tmp[i]);
+}
+
+// encrypt/decrypt columns of the key
+// n.b. you can replace this with
+//      byte-wise xor if you wish.
+
+void AddRoundKey (unsigned *state, unsigned *key)
+{
+int idx;
+
+	for( idx = 0; idx < 4; idx++ )
+		state[idx] ^= key[idx];
+}
+
+unsigned char Rcon[11] = {
+0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36};
+
+// produce Nb bytes for each round
+void ExpandKey (unsigned char *key, unsigned char *expkey)
+{
+unsigned char tmp0, tmp1, tmp2, tmp3, tmp4;
+unsigned idx;
+
+	memcpy (expkey, key, Nk * 4);
+
+	for( idx = Nk; idx < Nb * (Nr + 1); idx++ ) {
+		tmp0 = expkey[4*idx - 4];
+		tmp1 = expkey[4*idx - 3];
+		tmp2 = expkey[4*idx - 2];
+		tmp3 = expkey[4*idx - 1];
+		if( !(idx % Nk) ) {
+			tmp4 = tmp3;
+			tmp3 = Sbox(tmp0);
+			tmp0 = Sbox(tmp1) ^ Rcon[idx/Nk];
+			tmp1 = Sbox(tmp2);
+			tmp2 = Sbox(tmp4);
+		} else if( Nk > 6 && idx % Nk == 4 ) {
+			tmp0 = Sbox(tmp0);
+			tmp1 = Sbox(tmp1);
+			tmp2 = Sbox(tmp2);
+			tmp3 = Sbox(tmp3);
+		}
+
+		expkey[4*idx+0] = expkey[4*idx - 4*Nk + 0] ^ tmp0;
+		expkey[4*idx+1] = expkey[4*idx - 4*Nk + 1] ^ tmp1;
+		expkey[4*idx+2] = expkey[4*idx - 4*Nk + 2] ^ tmp2;
+		expkey[4*idx+3] = expkey[4*idx - 4*Nk + 3] ^ tmp3;
+	}
+}
+
+// encrypt one 128 bit block
+void Encrypt (unsigned char *in, unsigned char *expkey, unsigned char *out)
+{
+unsigned char state[Nb * 4];
+unsigned round;
+
+	memcpy (state, in, Nb * 4);
+	AddRoundKey ((unsigned *)state, (unsigned *)expkey);
+
+	for( round = 1; round < Nr + 1; round++ ) {
+		if( round < Nr )
+			MixSubColumns (state);
+		else
+			ShiftRows (state);
+
+		AddRoundKey ((unsigned *)state, (unsigned *)expkey + round * Nb);
+	}
+
+	memcpy (out, state, sizeof(state));
+}
+
+void Decrypt (unsigned char *in, unsigned char *expkey, unsigned char *out)
+{
+unsigned char state[Nb * 4];
+unsigned round;
+
+	memcpy (state, in, sizeof(state));
+
+	AddRoundKey ((unsigned *)state, (unsigned *)expkey + Nr * Nb);
+	InvShiftRows(state);
+
+	for( round = Nr; round--; )
+	{
+		AddRoundKey ((unsigned *)state, (unsigned *)expkey + round * Nb);
+		if( round )
+			InvMixSubColumns (state);
+	} 
+
+	memcpy (out, state, sizeof(state));
+}
+
+
+/*avr specific routines*/
+#include "backward.h"
+#include <avr/io.h>
+#include <avr/pgmspace.h>
+#include <avr/eeprom.h>
+#include <avr/interrupt.h>
+#include <avr/sleep.h>
+
+
+
+#if defined(at90s2313) || defined(at90s8535)
+#else
+#define ATmega
+#endif
+
+#ifdef ATmega
+#define USR UCSRA
+#endif
+
+
+
+void printP (PGM_P string){
+        char c;
+        c=pgm_read_byte(string);
+                   while (c) {
+                   loop_until_bit_is_set(USR, UDRE);
+                   UDR = c;
+                   c=pgm_read_byte(++string);
+                   }
+                   return;
+                 }
+
+
+
+void print (const char *string){
+                   while (*string) {
+                   loop_until_bit_is_set(USR, UDRE);
+                   UDR = *string++;
+                   }
+                   return;
+                 }
+
+void scan(char *string){
+char c;
+        do      {
+                do {
+                        loop_until_bit_is_set(USR, RXC);
+                        c =UDR;
+                        } while bit_is_set(USR, FE);
+                *string++ = c;
+                //echo the character
+                loop_until_bit_is_set(USR, UDRE);
+                UDR = c;
+                } while ( c != '\r' );
+        loop_until_bit_is_set(USR, UDRE);
+        UDR = '\n';
+        string[-1]=0;
+        }
+
+
+//UART initialize
+#ifdef ATmega
+#define UCR UCSRB
+#define UART_INIT(baud) { \
+UBRRH=0; \
+UBRRL= (XTAL/baud+15)/16-1; \
+UCSRB=(1<<TXEN)|(1<<RXEN); \
+UCSRC=(1<<URSEL)|(1<<UCSZ0)|(1<<UCSZ1)|(1<<USBS); }
+#else
+#define UART_INIT(baud) { \
+UBRR = (XTAL/baud+15)/16-1; \
+sbi(UCR, TXEN); \
+sbi(UCR, RXEN); \
+}
+#endif
+
+#define itoa10(N,S) itoa(N,S,10)
+#define itoa16(N,S) itoa(N,S,16)
+
+
+//DEMO
+
+unsigned char sampleout[16];
+
+
+unsigned char samplekey[] = {0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab,
+0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c};
+
+unsigned char samplein[] = {0x32, 0x43, 0xf6, 0xa8, 0x88, 0x5a, 0x30, 0x8d, 0x31,
+0x31, 0x98, 0xa2, 0xe0, 0x37, 0x07, 0x34};
+
+#define BAUD 115200
+
+int main(void)
+{
+UART_INIT(BAUD);
+
+unsigned char expkey[4 * Nb * (Nr + 1)];
+unsigned char i;
+char c[8];
+
+	printP(PSTR("Original: "));
+	for( i = 0; i < 16; i++ ) {itoa16(samplein[i],c);print(c); print(" ");}
+	printP(PSTR("\n"));
+
+	ExpandKey (samplekey, expkey);
+	Encrypt (samplein, expkey, sampleout);
+
+	printP(PSTR("Encrypted: "));
+	for( i = 0; i < 16; i++ ) {itoa16(sampleout[i],c);print(c); print(" ");}
+	printP(PSTR("\n"));
+
+	Decrypt (sampleout, expkey, samplein);
+
+	printP(PSTR("Decrypted: "));
+
+	for( i = 0; i < 16; i++ ) {itoa16(samplein[i],c);print(c); print(" ");}
+	printP(PSTR("\n"));
+}
+