pihelp: aes.c annotate

annotate aes.c @ 19:5f9a40d6991b

Import SD handling from http://www.roland-riegel.de/sd-reader/index.html Use smaller build options

author	Matt Johnston <matt@ucc.asn.au>
date	Tue, 25 Jun 2013 13:55:11 +0800
parents	439b7aaaec9e
children

rev	line source
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	1 #include "aes.h"
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	2 //#include "loader.h"
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	3 //
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	4 #define KEY_COUNT 1
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	5
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	6 #if KEY_COUNT > 0
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	7
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	8 //#include "aeskeys.inc"
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	9
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	10
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	11
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	12
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	13 typedef unsigned char byte;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	14
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	15
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	16
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	17 #define BPOLY 0x1b //!< Lower 8 bits of (x^8+x^4+x^3+x+1), ie. (x^4+x^3+x+1).
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	18 #define BLOCKSIZE 16 //!< Block size in number of bytes.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	19
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	20
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	21
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	22 #if KEY_COUNT == 1
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	23 #define KEYBITS 128 //!< Use AES128.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	24 #elif KEY_COUNT == 2
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	25 #define KEYBITS 192 //!< Use AES196.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	26 #elif KEY_COUNT == 3
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	27 #define KEYBITS 256 //!< Use AES256.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	28 #else
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	29 #error Use 1, 2 or 3 keys!
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	30 #endif
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	31
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	32 #if KEYBITS == 128
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	33 #define ROUNDS 10 //!< Number of rounds.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	34 #define KEYLENGTH 16 //!< Key length in number of bytes.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	35 #elif KEYBITS == 192
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	36 #define ROUNDS 12 //!< Number of rounds.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	37 #define KEYLENGTH 24 //!< // Key length in number of bytes.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	38 #elif KEYBITS == 256
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	39 #define ROUNDS 14 //!< Number of rounds.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	40 #define KEYLENGTH 32 //!< Key length in number of bytes.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	41 #else
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	42 #error Key must be 128, 192 or 256 bits!
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	43 #endif
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	44
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	45 #define EXPANDED_KEY_SIZE (BLOCKSIZE * (ROUNDS+1)) //!< 176, 208 or 240 bytes.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	46
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	47
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	48
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	49 byte block1[ 256 ]; //!< Workspace 1.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	50 byte block2[ 256 ]; //!< Worksapce 2.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	51
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	52
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	53
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	54 byte * powTbl; //!< Final location of exponentiation lookup table.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	55 byte * logTbl; //!< Final location of logarithm lookup table.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	56 byte * sBox; //!< Final location of s-box.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	57 byte * sBoxInv; //!< Final location of inverse s-box.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	58 byte * expandedKey; //!< Final location of expanded key.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	59
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	60
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	61
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	62 void CalcPowLog( byte * powTbl, byte * logTbl )
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	63 {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	64 byte i = 0;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	65 byte t = 1;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	66
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	67 do {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	68 // Use 0x03 as root for exponentiation and logarithms.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	69 powTbl[i] = t;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	70 logTbl[t] = i;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	71 i++;
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	72
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	73 // Muliply t by 3 in GF(2^8).
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	74 t ^= (t << 1) ^ (t & 0x80 ? BPOLY : 0);
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	75 } while( t != 1 ); // Cyclic properties ensure that i < 255.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	76
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	77 powTbl[255] = powTbl[0]; // 255 = '-0', 254 = -1, etc.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	78 }
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	79
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	80
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	81
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	82 void CalcSBox( byte * sBox )
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	83 {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	84 byte i, rot;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	85 byte temp;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	86 byte result;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	87
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	88 // Fill all entries of sBox[].
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	89 i = 0;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	90 do {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	91 // Inverse in GF(2^8).
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	92 if( i > 0 ) {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	93 temp = powTbl[ 255 - logTbl[i] ];
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	94 } else {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	95 temp = 0;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	96 }
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	97
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	98 // Affine transformation in GF(2).
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	99 result = temp ^ 0x63; // Start with adding a vector in GF(2).
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	100 for( rot = 0; rot < 4; rot++ ) {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	101 // Rotate left.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	102 temp = (temp<<1) \| (temp>>7);
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	103
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	104 // Add rotated byte in GF(2).
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	105 result ^= temp;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	106 }
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	107
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	108 // Put result in table.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	109 sBox[i] = result;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	110 } while( ++i != 0 );
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	111 }
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	112
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	113
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	114
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	115 void CalcSBoxInv( byte * sBox, byte * sBoxInv )
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	116 {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	117 byte i = 0;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	118 byte j = 0;
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	119
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	120 // Iterate through all elements in sBoxInv using i.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	121 do {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	122 // Search through sBox using j.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	123 do {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	124 // Check if current j is the inverse of current i.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	125 if( sBox[ j ] == i ) {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	126 // If so, set sBoxInc and indicate search finished.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	127 sBoxInv[ i ] = j;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	128 j = 255;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	129 }
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	130 } while( ++j != 0 );
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	131 } while( ++i != 0 );
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	132 }
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	133
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	134
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	135
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	136 void CycleLeft( byte * row )
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	137 {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	138 // Cycle 4 bytes in an array left once.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	139 byte temp = row[0];
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	140 row[0] = row[1];
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	141 row[1] = row[2];
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	142 row[2] = row[3];
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	143 row[3] = temp;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	144 }
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	145
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	146
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	147
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	148 void InvMixColumn( byte * column )
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	149 {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	150 byte result0, result1, result2, result3;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	151 byte column0, column1, column2, column3;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	152 byte xor;
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	153
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	154 // This generates more effective code, at least
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	155 // with the IAR C compiler.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	156 column0 = column[0];
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	157 column1 = column[1];
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	158 column2 = column[2];
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	159 column3 = column[3];
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	160
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	161 // Partial sums (modular addition using XOR).
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	162 result0 = column1 ^ column2 ^ column3;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	163 result1 = column0 ^ column2 ^ column3;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	164 result2 = column0 ^ column1 ^ column3;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	165 result3 = column0 ^ column1 ^ column2;
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	166
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	167 // Multiply column bytes by 2 modulo BPOLY.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	168 // This operation is done the following way to ensure cycle count
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	169 // independent from data contents. Take care when changing this code.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	170 xor = 0;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	171 if (column0 & 0x80) {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	172 xor = BPOLY;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	173 }
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	174 column0 <<= 1;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	175 column0 ^= xor;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	176
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	177 xor = 0;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	178 if (column1 & 0x80) {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	179 xor = BPOLY;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	180 }
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	181 column1 <<= 1;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	182 column1 ^= xor;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	183
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	184 xor = 0;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	185 if (column2 & 0x80) {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	186 xor = BPOLY;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	187 }
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	188 column2 <<= 1;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	189 column2 ^= xor;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	190
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	191 xor = 0;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	192 if (column3 & 0x80) {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	193 xor = BPOLY;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	194 }
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	195 column3 <<= 1;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	196 column3 ^= xor;
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	197
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	198 // More partial sums.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	199 result0 ^= column0 ^ column1;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	200 result1 ^= column1 ^ column2;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	201 result2 ^= column2 ^ column3;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	202 result3 ^= column0 ^ column3;
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	203
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	204 // Multiply column bytes by 2 modulo BPOLY.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	205 // This operation is done the following way to ensure cycle count
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	206 // independent from data contents. Take care when changing this code.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	207 xor = 0;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	208 if (column0 & 0x80) {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	209 xor = BPOLY;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	210 }
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	211 column0 <<= 1;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	212 column0 ^= xor;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	213
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	214 xor = 0;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	215 if (column1 & 0x80) {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	216 xor = BPOLY;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	217 }
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	218 column1 <<= 1;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	219 column1 ^= xor;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	220
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	221 xor = 0;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	222 if (column2 & 0x80) {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	223 xor = BPOLY;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	224 }
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	225 column2 <<= 1;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	226 column2 ^= xor;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	227
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	228 xor = 0;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	229 if (column3 & 0x80) {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	230 xor = BPOLY;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	231 }
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	232 column3 <<= 1;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	233 column3 ^= xor;
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	234
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	235 // More partial sums.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	236 result0 ^= column0 ^ column2;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	237 result1 ^= column1 ^ column3;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	238 result2 ^= column0 ^ column2;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	239 result3 ^= column1 ^ column3;
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	240
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	241 // Multiply column bytes by 2 modulo BPOLY.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	242 // This operation is done the following way to ensure cycle count
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	243 // independent from data contents. Take care when changing this code.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	244 xor = 0;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	245 if (column0 & 0x80) {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	246 xor = BPOLY;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	247 }
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	248 column0 <<= 1;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	249 column0 ^= xor;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	250
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	251 xor = 0;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	252 if (column1 & 0x80) {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	253 xor = BPOLY;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	254 }
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	255 column1 <<= 1;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	256 column1 ^= xor;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	257
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	258 xor = 0;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	259 if (column2 & 0x80) {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	260 xor = BPOLY;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	261 }
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	262 column2 <<= 1;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	263 column2 ^= xor;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	264
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	265 xor = 0;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	266 if (column3 & 0x80) {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	267 xor = BPOLY;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	268 }
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	269 column3 <<= 1;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	270 column3 ^= xor;
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	271
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	272 // Final partial sum.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	273 column0 ^= column1 ^ column2 ^ column3;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	274
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	275 // Final sums stored into original column bytes.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	276 column[0] = result0 ^ column0;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	277 column[1] = result1 ^ column0;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	278 column[2] = result2 ^ column0;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	279 column[3] = result3 ^ column0;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	280 }
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	281
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	282
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	283
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	284 void SubBytes( byte * bytes, byte count )
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	285 {
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	286 do {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	287 bytes = sBox[ bytes ]; // Substitute every byte in state.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	288 bytes++;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	289 } while( --count );
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	290 }
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	291
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	292
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	293
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	294 void InvSubBytesAndXOR( byte * bytes, byte * key, byte count )
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	295 {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	296 do {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	297 // bytes = sBoxInv[ bytes ] ^ *key; // Inverse substitute every byte in state and add key.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	298 bytes = block2[ bytes ] ^ *key; // Use block2 directly. Increases speed.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	299 bytes++;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	300 key++;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	301 } while( --count );
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	302 }
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	303
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	304
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	305
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	306 void InvShiftRows( byte * state )
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	307 {
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	308 byte temp;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	309
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	310 // Note: State is arranged column by column.
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	311
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	312 // Cycle second row right one time.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	313 temp = state[ 1 + 3*4 ];
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	314 state[ 1 + 34 ] = state[ 1 + 24 ];
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	315 state[ 1 + 24 ] = state[ 1 + 14 ];
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	316 state[ 1 + 14 ] = state[ 1 + 04 ];
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	317 state[ 1 + 0*4 ] = temp;
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	318
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	319 // Cycle third row right two times.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	320 temp = state[ 2 + 0*4 ];
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	321 state[ 2 + 04 ] = state[ 2 + 24 ];
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	322 state[ 2 + 2*4 ] = temp;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	323 temp = state[ 2 + 1*4 ];
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	324 state[ 2 + 14 ] = state[ 2 + 34 ];
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	325 state[ 2 + 3*4 ] = temp;
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	326
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	327 // Cycle fourth row right three times, ie. left once.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	328 temp = state[ 3 + 0*4 ];
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	329 state[ 3 + 04 ] = state[ 3 + 14 ];
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	330 state[ 3 + 14 ] = state[ 3 + 24 ];
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	331 state[ 3 + 24 ] = state[ 3 + 34 ];
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	332 state[ 3 + 3*4 ] = temp;
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	333 }
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	334
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	335
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	336
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	337 void InvMixColumns( byte * state )
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	338 {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	339 InvMixColumn( state + 0*4 );
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	340 InvMixColumn( state + 1*4 );
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	341 InvMixColumn( state + 2*4 );
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	342 InvMixColumn( state + 3*4 );
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	343 }
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	344
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	345
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	346
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	347 void XORBytes( byte * bytes1, byte * bytes2, byte count )
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	348 {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	349 do {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	350 bytes1 ^= bytes2; // Add in GF(2), ie. XOR.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	351 bytes1++;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	352 bytes2++;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	353 } while( --count );
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	354 }
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	355
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	356
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	357
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	358 void CopyBytes( byte * to, byte * from, byte count )
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	359 {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	360 do {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	361 to = from;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	362 to++;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	363 from++;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	364 } while( --count );
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	365 }
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	366
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	367
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	368
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	369 void KeyExpansion( byte * key, byte * expandedKey )
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	370 {
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	371 byte temp[4];
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	372 byte i;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	373 byte Rcon[4] = { 0x01, 0x00, 0x00, 0x00 }; // Round constant.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	374
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	375 #if 0
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	376 // matt
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	377 unsigned char BOOTFLASH * key = kTable;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	378 #endif
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	379
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	380 // Copy key to start of expanded key.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	381 i = KEYLENGTH;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	382 do {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	383 expandedKey = key;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	384 expandedKey++;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	385 key++;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	386 } while( --i );
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	387
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	388 // Prepare last 4 bytes of key in temp.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	389 expandedKey -= 4;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	390 temp[0] = *(expandedKey++);
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	391 temp[1] = *(expandedKey++);
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	392 temp[2] = *(expandedKey++);
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	393 temp[3] = *(expandedKey++);
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	394
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	395 // Expand key.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	396 i = KEYLENGTH;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	397 while( i < BLOCKSIZE*(ROUNDS+1) ) {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	398 // Are we at the start of a multiple of the key size?
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	399 if( (i % KEYLENGTH) == 0 ) {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	400 CycleLeft( temp ); // Cycle left once.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	401 SubBytes( temp, 4 ); // Substitute each byte.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	402 XORBytes( temp, Rcon, 4 ); // Add constant in GF(2).
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	403 Rcon = (Rcon << 1) ^ (*Rcon & 0x80 ? BPOLY : 0);
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	404 }
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	405
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	406 // Keysize larger than 24 bytes, ie. larger that 192 bits?
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	407 #if KEYLENGTH > 24
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	408 // Are we right past a block size?
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	409 else if( (i % KEYLENGTH) == BLOCKSIZE ) {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	410 SubBytes( temp, 4 ); // Substitute each byte.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	411 }
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	412 #endif
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	413
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	414 // Add bytes in GF(2) one KEYLENGTH away.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	415 XORBytes( temp, expandedKey - KEYLENGTH, 4 );
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	416
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	417 // Copy result to current 4 bytes.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	418 *(expandedKey++) = temp[ 0 ];
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	419 *(expandedKey++) = temp[ 1 ];
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	420 *(expandedKey++) = temp[ 2 ];
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	421 *(expandedKey++) = temp[ 3 ];
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	422
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	423 i += 4; // Next 4 bytes.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	424 }
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	425 }
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	426
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	427
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	428
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	429 void InvCipher( byte * block, byte * expandedKey )
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	430 {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	431 byte round = ROUNDS-1;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	432 expandedKey += BLOCKSIZE * ROUNDS;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	433
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	434 XORBytes( block, expandedKey, 16 );
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	435 expandedKey -= BLOCKSIZE;
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	436
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	437 do {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	438 InvShiftRows( block );
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	439 InvSubBytesAndXOR( block, expandedKey, 16 );
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	440 expandedKey -= BLOCKSIZE;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	441 InvMixColumns( block );
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	442 } while( --round );
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	443
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	444 InvShiftRows( block );
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	445 InvSubBytesAndXOR( block, expandedKey, 16 );
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	446 }
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	447
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	448
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	449
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	450 void aesInit( unsigned char key, unsigned char tempbuf )
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	451 {
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	452 powTbl = block1;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	453 logTbl = block2;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	454 CalcPowLog( powTbl, logTbl );
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	455
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	456 sBox = tempbuf;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	457 CalcSBox( sBox );
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	458
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	459 expandedKey = block1;
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	460 KeyExpansion( key, expandedKey );
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	461
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	462 sBoxInv = block2; // Must be block2.
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	463 CalcSBoxInv( sBox, sBoxInv );
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	464 }
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	465
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	466
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	467
10 439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	468 void aesDecrypt( unsigned char * buffer, unsigned char * chainBlock )
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	469 {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	470 byte temp[ BLOCKSIZE ];
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	471
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	472 CopyBytes( temp, buffer, BLOCKSIZE );
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	473 InvCipher( buffer, expandedKey );
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	474 if (chainBlock)
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	475 {
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	476 XORBytes( buffer, chainBlock, BLOCKSIZE );
439b7aaaec9e Get aes from avr231 appnote instead Matt Johnston <matt@ucc.asn.au> parents: 5 diff changeset	477 CopyBytes( chainBlock, temp, BLOCKSIZE );
3 ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	478 }
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	479 }
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	480
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/ Matt Johnston <matt@ucc.asn.au> parents: diff changeset	481 #endif

Mercurial > pihelp

annotate aes.c @ 19:5f9a40d6991b